CN203300190U - Pixel circuit, organic light-emitting display panel and display device - Google Patents

Pixel circuit, organic light-emitting display panel and display device Download PDF

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Publication number
CN203300190U
CN203300190U CN2013203602827U CN201320360282U CN203300190U CN 203300190 U CN203300190 U CN 203300190U CN 2013203602827 U CN2013203602827 U CN 2013203602827U CN 201320360282 U CN201320360282 U CN 201320360282U CN 203300190 U CN203300190 U CN 203300190U
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China
Prior art keywords
transistor
signal input
circuit
image
transistorized
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CN2013203602827U
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Chinese (zh)
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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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Priority to CN2013203602827U priority Critical patent/CN203300190U/en
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Publication of CN203300190U publication Critical patent/CN203300190U/en

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Abstract

The utility model provides a pixel circuit, an organic light-emitting display panel and a display device. The pixel circuit is provided with a driving transistor, a first capacitor, an organic light-emitting diode, a first control unit and a driving unit. A data voltage is directly inputted into a grid of the driving transistor, so the pixel circuit makes a grid potential of the driving transistor be fixed, moreover, a threshold voltage of the driving transistor is stored in a storage capacitor by utilizing self-discharging of the storage capacitor, the fixed potential is introduced to one electrode of the storage capacitor to eliminate influence of internal line resistance on light-emitting current, so display non-uniformity of frames of the panel is meliorated.

Description

Image element circuit, organic electroluminescence display panel and display device
Technical field
The utility model relates to the organic light emitting display field, relates in particular to a kind of image element circuit, organic electroluminescence display panel and display device.
Background technology
AMOLED(active matrix organic light-emitting diode: Active Matrix Organic Light Emitting Diode) why can be luminous, normally by the DTFT(driving transistors) drive current that produces when state of saturation drives.
At present, the main production method of AMOLED display panel is to utilize the LTPS(low temperature polycrystalline silicon) the 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 panel diverse location of making) larger difference is also arranged, Vth also has drift simultaneously.
And in existing traditional AMOLED driving circuit, in the drive current computing formula that DTFT produces, usually comprise the Vth of TFT.So as mentioned above, because there is larger difference in the Vth of the TFT of display panel diverse location in prior art, cause the drive current of AMOLED under same gray scale voltage different, therefore caused display panel diverse location brightness meeting variant, caused display panel brightness homogeneity poor.
In addition, the application of touch function in various display panels especially mobile display is more and more wider, almost become the standard configuration of Intelligent mobile equipment, existing technique is that display panel and touch panel are separately made, and then fit, such technological process makes the function panel complex process that shows touch-screen, and cost is high, and what also be unfavorable for showing is lightening.
The utility model content
The utility model provides a kind of image element circuit, organic electroluminescence display panel and display device, can eliminate the impact of image element circuit internal resistance on light emission drive current, can improve homogeneity and the reliability of organic electroluminescence display panel brightness.
The utility model provides scheme as follows:
The utility model embodiment 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 the second electrical level signal input part;
Described the first control module is connected with the first sweep signal input end, data line, fixed voltage input end, described the first electric capacity first end, the grid of described driving transistors, described driver element respectively, be used under the first sweep signal is controlled, be fixed voltage with 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 data voltage and drive transistor threshold voltage sum;
Driver element is connected described the first control module with the grid of LED control signal input end, the first level signal input end, described first electric capacity the second end, described driving transistors respectively and is connected with source electrode, be used under LED control signal is controlled, utilize the gate source voltage of the pressure reduction at described the first electric capacity two ends as driving transistors, drive Organic Light Emitting Diode luminous.
Preferably, described the first control module comprises:
The 6th transistor and the 7th transistor; Wherein:
The described the 6th transistorized source electrode is connected with described fixed voltage input end, the described the 6th transistorized grid is connected with described the first sweep signal input end, and the 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 line, and the described the 7th transistorized grid is connected with described the first sweep signal input end, and the 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:
The described the 3rd transistorized source electrode is connected with described the first level signal input end, the described the 3rd transistorized grid is connected with described LED control signal input end, and the 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;
The described the 5th transistorized source electrode is connected with described node g, and the described the 5th transistorized grid is connected with described LED control signal input end, and the described the 5th transistorized drain electrode is connected with described node m.
Preferably, described image element circuit also comprises:
Be used for eliminating described Organic Light Emitting Diode luminescent layer the 4th transistor of compound charge carrier not at the interface;
The described the 4th transistorized drain electrode is connected with described second electrical level signal input part, and the described the 4th transistorized grid is connected with described the first sweep signal input end, the anodic bonding of the 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 end, and described the second control module of the drain electrode of described amplifier transistor connects;
The second end of described the second electric capacity is connected with the second sweep signal input end;
Described charhing unit is connected with the first sweep signal input end, the first level input end and described node p respectively, is used for being described the second capacitor charging under the first sweep signal is controlled;
Described the second control module is connected with the drain electrode of described the second sweep signal input end, the line of induction, described amplifier transistor respectively, be used under described the second sweep signal is controlled, 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 end, and the grid of described transistor seconds is connected with described the first sweep signal input end, 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 end, and the drain electrode of described the first transistor is connected with the described line of induction.
Preferably, the transistor that comprises of described image element circuit is the P transistor npn npn;
Described the first level signal input end is connected with high level;
Described second electrical level signal input part is connected with low level.
The utility model embodiment also provides a kind of organic electroluminescence display panel, and it specifically can comprise the described image element circuit that above-mentioned the utility model embodiment provides.
The utility model embodiment also provides a kind of display device, and it specifically can comprise the described organic electroluminescence display panel that above-mentioned the utility model embodiment provides.
Can find out from the above, the image element circuit that the utility model provides, organic electroluminescence display panel and display device, 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 end, data line, fixed voltage input end, described the first electric capacity first end, the grid of described driving transistors, described driver element respectively, be used under the first sweep signal is controlled, be fixed voltage with the control of Electric potentials of described the first electric capacity first end, utilize the first electric capacity, by the driving transistors self discharge, the current potential of described first electric capacity the second end is remained data voltage and drive transistor threshold voltage sum; Driver element is connected described the first control module with the grid of LED control signal input end, the first level input end, described first electric capacity the second end, described driving transistors respectively and is connected with source electrode, be used under LED control signal is controlled, utilize the gate source voltage of the pressure reduction at described the first electric capacity two ends as 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, make the grid potential of driving transistors fix, utilize simultaneously the self discharge of memory capacitance that the threshold voltage of driving transistors is kept in memory capacitance, introduce set potential in an electrode of memory capacitance and eliminate the impact of circuit internal resistance on glow current, thereby improved the unevenness of panel picture disply.
Description of drawings
The image element circuit structure schematic diagram one that Fig. 1 provides for the utility model embodiment;
The image element circuit structure schematic diagram two that Fig. 2 provides for the utility model embodiment;
The image element circuit structure schematic diagram three that Fig. 3 provides for the utility model embodiment;
The pixel circuit drive method schematic flow sheet that Fig. 4 provides for the utility model embodiment;
Fig. 5 drives signal timing diagram for the image element circuit that the utility model embodiment provides;
The pixel circuit section schematic equivalent circuit one that Fig. 6 provides for the utility model embodiment;
The pixel circuit section schematic equivalent circuit two that Fig. 7 provides for the utility model embodiment;
The pixel circuit section schematic equivalent circuit three that Fig. 8 provides for the utility model embodiment;
The pixel circuit section schematic equivalent circuit four that Fig. 9 provides for the utility model embodiment.
Embodiment
, for the purpose, technical scheme and the advantage that make the utility model embodiment is clearer, below in conjunction with the accompanying drawing of the utility model embodiment, the technical scheme of the utility model embodiment is clearly and completely described.Obviously, described embodiment is a part of embodiment of the present utility model, rather than whole embodiment.Based on described embodiment of the present utility model, the every other embodiment that those of ordinary skills obtain, belong to the scope that the utility model is protected.
Unless separately define, technical term used herein or scientific terminology should be the ordinary meaning that the personage that has general technical ability under the utility model in field understands." first " of using in the utility model patent application specification and claims, " second " and similar word do not represent any order, quantity or importance, and just are used for distinguishing different ingredients.Equally, " one " or similar words such as " one " do not represent restricted number yet, and mean and have at least one." connection " or " being connected " etc. similarly word not be 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. only are used for the expression relative position relation, after the absolute position that is described object changed, this relative position relation also correspondingly changed.
The utility model embodiment provides a kind of image element circuit, and as shown in Figure 1, it is specifically to comprise: driving transistors DTFT, the first capacitor C ST, 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 the second electrical level signal input part;
The first control module 11, respectively with the first sweep signal G(n) input end, data line (Data Line, i.e. data voltage Vdata input end), fixed voltage Vref input end, the first capacitor C ST, driving transistors DTFT, driver element 12 connect, be used under the first sweep signal is controlled, with the first capacitor C STThe 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 C STSelf discharge by driving transistors DTFT makes the first capacitor C STThe 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 end, the first level input end, the first capacitor C ST, driving transistors DTFT, the first control module 11 connect, be used for utilizing the first capacitor C under LED control signal is controlled STThe 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 utility model embodiment provides,, by directly data voltage Vdata being input to the grid of driving transistors DTFT, make driving transistors DTFT grid potential fix, and utilizes simultaneously memory capacitance C STSelf discharge the threshold voltage vt hd of driving transistors DTFT is kept at the first capacitor C STIn, the first capacitor C STAn electrode in introduce set 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 homogeneity and the reliability of organic electroluminescence display panel brightness.
In the utility model 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 end, the grid of the 6th transistor T 6 and the first sweep signal G(n) input end is connected, the drain electrode of the 6th transistor T 6 respectively with the first capacitor C STFirst end, driver element 12 are connected in node m;
The source electrode of the 7th transistor T 7 is connected with data line, the grid of the 7th transistor T 7 and the first sweep signal G(n) input end 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 utility model 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 end, the grid of the 3rd transistor T 3 and LED control signal EM(n) input end is connected, the drain electrode of the 3rd transistor T 3 respectively with the first capacitor C STThe 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 end 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 utility model embodiment is specifically as follows direct current high level signal VDD, can be also other regularly signals of input high level; And the 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 utility model one specific embodiment, as shown in Figure 3, the image element circuit that the utility model embodiment provides specifically can also comprise:
Induction electrode (SE:Sense Electrode) 13, amplifier transistor ATFT, the second capacitor C P, charhing unit 14 and the second control module 15; Wherein:
Induction electrode 13 respectively with charhing unit 14, the second capacitor C PFirst end, amplifier transistor The grid of ATFT is connected in node p;
The source electrode of amplifier transistor ATFT is connected with the first level input end, and drain electrode the second control module 15 of amplifier transistor ATFT connects;
The second capacitor C PThe second end and the second sweep signal G(n+1) input end is connected;
Charhing unit 14 respectively with the first sweep signal G(n) input end, the first level input end and node p be connected, be used at the first sweep signal G(n) and control under, for stating the second capacitor C PCharging;
The second control module 15 respectively with the second sweep signal G(n+1) drain electrode of input end, the line of induction (Sense Line), amplifier transistor ATFT is connected, be used 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.
as seen, the image element circuit that the utility model embodiment provides, all right integrated touch circuit for detecting, control signal in the AMOLED light emission drive circuit that this touch circuit for detecting is multiplexing, the coupling capacitance that touches in circuit for detecting is charged, and utilize amplifier tube transistor (Amplify TFT, be ATFT) amplify touching the touch signal that produces, when not increasing circuit structure and Operating Complexity, realized that well the touch circuit is integrated on panel, thereby can realize that internally-arranged type touch-screen and Organic Light Emitting Diode drive show integrated, be conducive to reduce thickness and the weight of display panel, and can reduce the cost of display panel.
In the utility model 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 end, the grid of transistor seconds T2 and the first sweep signal G(n) input end is connected, and the drain electrode of transistor seconds T2 is connected with node p.
In the utility model 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 end, the drain electrode of the first transistor T1 is connected with the described line of induction.
In the utility model one specific embodiment, the image element circuit that the utility model embodiment provides specifically can also comprise:
Be used for to eliminate Organic Light Emitting Diode OLED luminescent layer the 4th transistor T 4 of compound charge carrier not at the interface.
Concrete, as shown in Figure 2, the drain electrode of the 4th transistor T 4 is connected with the second electrical level signal input part, the grid of the 4th transistor T 4 and the first sweep signal G(n) input end 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 utility model embodiment is related, when opening, the first sweep trace make the anode of Organic Light Emitting Diode OLED be shorted to for example VSS of second electrical level input end, thereby can eliminate the not compound charge carrier of Organic Light Emitting Diode OLED internal illumination bed interface 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 the optional embodiment of the utility model one, the related transistor of above-mentioned the utility model embodiment, comprise the first transistor T1 to the seven transistor Ts 7, and driving transistors DTFT, amplifier transistor ATFT, specifically all can be the P transistor npn npn, and the source in above-mentioned transistor, the drain electrode interchangeable.
The utility model embodiment also provides a kind of pixel circuit drive method that drives the image element circuit that above-mentioned the utility model embodiment provides.As shown in Figure 4, the pixel circuit drive method that provides of the utility model embodiment specifically can comprise:
Step 41, i.e. the first stage, the first control module 11 is with the first capacitor C STThe 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 C STMake the first capacitor C by driving transistors DTFT self discharge STThe 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. subordinate phase, the first control module 11, driver element 12 and driving transistors DTFT all are 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 C STThe pressure reduction at two ends, as the gate source voltage of driving transistors DTFT, drives Organic Light Emitting Diode OLED luminous.
The driving method of the image element circuit that the utility model embodiment provides,, by directly data voltage Vdata being input to the grid of driving transistors DTFT, make driving transistors DTFT grid potential fix, and utilizes simultaneously the first capacitor C STThe driving transistors DTFT self discharge of passing through the threshold voltage vt hd of driving transistors DTFT is kept at the first capacitor C STIn, memory capacitance C STAn electrode in introduce set 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 homogeneity and the reliability of organic electroluminescence display panel brightness.
In the utility model one specific embodiment, the driving method of the image element circuit that the utility model embodiment provides specifically can also comprise the following steps:
First stage, it is the second capacitor C that charhing unit 14 utilizes the first level signal PCharging, amplifier transistor ATFT and the second control module 15 are in cut-off state;
Subordinate phase, charhing unit 14 and amplifier transistor ATFT are in cut-off state, the second control module 15 with amplifier transistor ATFT amplify with the 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.
As seen, the pixel circuit drive method that the utility model embodiment provides, control signal in all right multiplexing AMOLED light emission drive circuit, the coupling capacitance that touches in circuit for detecting is charged, and utilize amplifier tube transistor (Amplify TFT, be ATFT) amplify touching the touch signal that produces, thus when driving Organic Light Emitting Diode OELD is luminous, realize the detecting to touch signal.
In the utility model one specific embodiment, the driving method of the image element circuit that the utility model embodiment provides specifically can also comprise the following steps:
In the first stage, the 4th transistor T 4 is in conducting state;
In subordinate phase, 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 utility model embodiment provides, when opening, the first sweep trace make the anode of Organic Light Emitting Diode OLED be shorted to for example VSS of second electrical level input end, thereby can eliminate the not compound charge carrier of Organic Light Emitting Diode OLED internal illumination bed interface 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 driving method of the image element circuit that the utility model embodiment is provided is described.
In this embodiment, the first level signal is VDD, and the 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 and namely is in conducting state, the first transistor T1, the 3rd transistor T 3, the 5th transistor T 5 is closed and namely is 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, this moment, another utmost point of the second capacitor C p electric capacity was that the current potential of node q is that the current potential of the second sweep signal G (n+1) is high level VGH.This moment, the part equivalent circuit diagram of image element circuit can be as shown in Figure 6, and wherein direction shown in arrow is direction 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 line (Data line) input, still be in certain opening, therefore the n node of the first capacitor C st can be by driving transistors DTFT discharge, until the current potential of n node drops to data voltage Vdata and driving transistors T DTFTThreshold voltage | the 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 set 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.This moment, 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) in glow phase has like this accumulated at the interface 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.
Subordinate phase: 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 all are 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 when the second sweep signal G (n+1) jump in potential was low level, by the coupling of the second capacitor C p, node p was that the grid potential of amplifier transistor ATFT also can be followed downward saltus step.As for saltus step what, in two kinds of situation, if there is finger (Finger) to touch, due to can formation coupling capacitance Cf between finger and induction electrode S E, so the current potential that p is ordered be:
Vp=VDD+(VGL-VGH)*Cp/(Cp+Cf);
For amplifier transistor T ATFTGate source voltage Vsg be:
Vsg=Vs-Vg=VDD-[VDD+(VGL-VGH)*Cp/(Cp+Cf)]=(VGH-VGL)*Cp/(Cp+Cf);
Therefore the induction current size by line of induction Sense line is:
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 p current potential of ordering is:
Vp=VDD-(VGH-VGL);
For amplifier transistor T ATFTGate source voltage Vsg be:
Vsg=Vs-Vg=VDD-[VDD-(VGH-VGL)]=VGH-VGL;
Induction current size by line of induction Sense line 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 that causes.
This moment, the part equivalent circuit diagram of image element circuit can be as shown in Figure 8.
Simultaneously, the first control module 11, driver element 12 and driving transistors DTFT all are 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 no longer is connected with set potential, and with the grid of driving transistors DTFT, be connected, because the grid of driving transistors DTFT is in vacant state, even if therefore be connected (because of the 3rd transistor T 3 unlatchings) at n o'clock of the first capacitor C st 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 saturation current by driving transistors DTFT is that the glow current size of Organic Light Emitting Diode OLED 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.
This shows that the drive current size is only relevant with fixed voltage Vref size with data voltage Vdata, and driving transistors T DTFTThreshold voltage | it doesn't matter for Vthd|, and this image element circuit has also overcome the impact of internal resistance on glow current simultaneously.
This moment, 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 namely been completed by the above stage.
Based on the image element circuit that the utility model embodiment provides, the utility model embodiment also provides a kind of organic electroluminescence display panel, and this organic electroluminescence display panel specifically can comprise the image element circuit that above-mentioned the utility model embodiment provides.
The utility model embodiment also provides a kind of display device, and this display device specifically can comprise the organic electroluminescence display panel that above-mentioned the utility model embodiment provides.
This display device is specifically as follows the display device such as liquid crystal panel, LCD TV, liquid crystal display, oled panel, OLED display, plasma display or Electronic Paper.
Image element circuit described in the utility model, organic electroluminescence display panel and display device 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.
The image element circuit that the utility model provides, organic electroluminescence display panel and display device,, by directly data voltage Vdata being input to the grid of driving transistors DTFT, make driving transistors DTFT grid potential fix, and utilizes simultaneously the first capacitor C STSelf discharge the threshold voltage vt hd of driving transistors DTFT is kept at the first capacitor C STIn, the first capacitor C STAn electrode in introduce set 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 homogeneity and the reliability of organic electroluminescence display panel brightness.
simultaneously, also be provided with the touch signal circuit for detecting in the image element circuit that the utility model provides, control signal in the AMOLED light emission drive circuit that this touch circuit for detecting is multiplexing, the coupling capacitance that touches in circuit for detecting is charged, and utilize amplifier tube transistor (Amplify TFT, being ATFT) touch signal that touch screen is produced amplifies, when not increasing circuit structure and Operating Complexity, realized that well the touch circuit is integrated on panel, thereby can realize that internally-arranged type touch-screen and Organic Light Emitting Diode drive show integrated, be conducive to reduce thickness and the weight of display panel, and can reduce the cost of display panel.
In addition, the image element circuit that the utility model provides can also be provided with for eliminating Organic Light Emitting Diode OLED luminescent layer the 4th transistor T 4 of compound charge carrier not at the interface, when opening, the first sweep trace make the anode of Organic Light Emitting Diode OLED be shorted to for example VSS of second electrical level input end, thereby can eliminate the not compound charge carrier of Organic Light Emitting Diode OLED internal illumination bed interface 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 utility model embodiment provides is applicable to the thin film transistor (TFT) of the techniques such as amorphous silicon, polysilicon, oxide.Simultaneously,, although in above-described embodiment, as an example of single employing P type thin film transistor (TFT) example, be illustrated, yet foregoing circuit can also adopt single N-type thin film transistor (TFT) or CMOS pipe circuit easily instead; In addition, touch controllable function partly 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, yet the utility model is not limited to use the display device of active matrix organic light-emitting diode, also can be applied to use the display device of other various light emitting diodes.
The above is only embodiment of the present utility model; should be pointed out that for those skilled in the art, under the prerequisite that does not break away from the utility model principle; can also make some improvements and modifications, these improvements and modifications also should be considered as protection domain of the present utility model.

Claims (10)

1. an image element circuit, is characterized in that, 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 the second electrical level signal input part;
Described the first control module is connected with the first sweep signal input end, data line, fixed voltage input end, described the first electric capacity, described driving transistors, described driver element respectively, be used under the first sweep signal is controlled, be fixed voltage with 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 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 connected with LED control signal input end, the first level signal input end, described the first electric capacity, described driving transistors, described the first control module respectively, be used under LED control signal is controlled, utilize the gate source voltage of the pressure reduction at described the first electric capacity two ends as driving transistors, drive Organic Light Emitting Diode luminous.
2. image element circuit as claimed in claim 1, is characterized in that, described the first control module comprises:
The 6th transistor and the 7th transistor; Wherein:
The described the 6th transistorized source electrode is connected with described fixed voltage input end, the described the 6th transistorized grid is connected with described the first sweep signal input end, and the 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 line, and the described the 7th transistorized grid is connected with described the first sweep signal input end, and the described the 7th transistorized drain electrode is connected in node g with described drive transistor gate, described driver element respectively.
3. image element circuit as claimed in claim 2, is characterized in that, described driver element comprises:
The 3rd transistor and the 5th transistor; Wherein:
The described the 3rd transistorized source electrode is connected with described the first level signal input end, the described the 3rd transistorized grid is connected with described LED control signal input end, and the 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;
The described the 5th transistorized source electrode is connected with described node g, and the described the 5th transistorized grid is connected with described LED control signal input end, and the described the 5th transistorized drain electrode is connected with described node m.
4. image element circuit as claimed in claim 1, is characterized in that, also comprises:
Be used for eliminating described Organic Light Emitting Diode luminescent layer the 4th transistor of compound charge carrier not at the interface;
The described the 4th transistorized drain electrode is connected with described second electrical level signal input part, and the described the 4th transistorized grid is connected with described the first sweep signal input end, the anodic bonding of the described the 4th transistorized source electrode and described Organic Light Emitting Diode.
5. image element circuit as claimed in claim 1, is characterized in that, 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 end, and described the second control module of the drain electrode of described amplifier transistor connects;
The second end of described the second electric capacity is connected with the second sweep signal input end;
Described charhing unit is connected with the first sweep signal input end, the first level input end and described node p respectively, is used for being described the second capacitor charging under the first sweep signal is controlled;
Described the second control module is connected with the drain electrode of described the second sweep signal input end, the line of induction, described amplifier transistor respectively, be used under described the second sweep signal is controlled, the touch signal that induction electrode is sensed amplifies by amplifier transistor, and amplifier transistor amplifying signal electric current is transferred to chip by the second control module is touched determining whether.
6. image element circuit 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 end, and the grid of described transistor seconds is connected with described the first sweep signal input end, and the drain electrode of described transistor seconds is connected with described node p.
7. image element circuit 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, the grid of described the first transistor and described the second sweep signal input end, and the drain electrode of described the first transistor is connected with the described line of induction.
8., as the described image element circuit of claim 2-7 any one, it is characterized in that, the transistor that described image element circuit comprises is the P transistor npn npn;
Described the first level signal input end is connected with high level;
Described second electrical level signal input part is connected with low level.
9. an organic electroluminescence display panel, is characterized in that, comprises the image element circuit of described claim 1-8 any one.
10. a display device, is characterized in that, comprises organic electroluminescence display panel as claimed in claim 9.
CN2013203602827U 2013-06-21 2013-06-21 Pixel circuit, organic light-emitting display panel and display device CN203300190U (en)

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Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN103325339A (en) * 2013-06-21 2013-09-25 京东方科技集团股份有限公司 Pixel circuit, pixel circuit driving method, organic light-emitting display panel and display device
CN104700776A (en) * 2015-03-25 2015-06-10 京东方科技集团股份有限公司 Pixel circuit and driving method thereof, display device
CN110728952A (en) * 2019-10-31 2020-01-24 厦门天马微电子有限公司 Pixel driving circuit, driving method thereof and display device

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN103325339A (en) * 2013-06-21 2013-09-25 京东方科技集团股份有限公司 Pixel circuit, pixel circuit driving method, organic light-emitting display panel and display device
CN103325339B (en) * 2013-06-21 2016-05-25 京东方科技集团股份有限公司 Image element circuit and driving method thereof, organic electroluminescence display panel and display unit
CN104700776A (en) * 2015-03-25 2015-06-10 京东方科技集团股份有限公司 Pixel circuit and driving method thereof, display device
CN110728952A (en) * 2019-10-31 2020-01-24 厦门天马微电子有限公司 Pixel driving circuit, driving method thereof and display device
CN110728952B (en) * 2019-10-31 2021-04-30 厦门天马微电子有限公司 Pixel driving circuit, driving method thereof and display device

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