CN203134329U - Pixel circuit, organic light emitting display panel and display device - Google Patents
Pixel circuit, organic light emitting display panel and display device Download PDFInfo
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- CN203134329U CN203134329U CN2013201553864U CN201320155386U CN203134329U CN 203134329 U CN203134329 U CN 203134329U CN 2013201553864 U CN2013201553864 U CN 2013201553864U CN 201320155386 U CN201320155386 U CN 201320155386U CN 203134329 U CN203134329 U CN 203134329U
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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 formed through arranging a driving transistor, a first storage capacitor, a collection unit, a write unit and a light emitting unit, wherein the collection unit is used for collecting threshold value voltage of the driving transistor and storing the threshold value voltage in the first storage capacitor under the control of a first scanning signal; the write unit is used for storing data voltage input from a data voltage input terminal under the control of a second scanning signal; and the light emitting unit is used for emitting light through driving by the data voltage and voltage input from a controllable low-voltage input terminal under the control of a light emitting control signal. Therefore, an organic light emitting device can be insusceptible to critical voltage drift of the driving transistor, the image uniformity of the organic light emitting display panel can be improved effectively, the attenuation speed of the organic light emitting device can be decreased and the uniformity and constancy of the luminance of the organic light emitting display panel can be guaranteed.
Description
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
Because multimedia society is progressive rapidly, the technology of semiconductor element and display device also has tremendous progress thereupon.
With regard to display, (Active Matrix Organic Light Emitting Diode, AMOLED) displaying appliance has or not angle limitations, low manufacturing cost, high answer speed (being about more than hundred times of liquid crystal), power saving, autoluminescence, the direct drive that can be used for portable machine, operating temperature range is big and in light weight and can be with hardware device miniaturization and slimming etc. advantage to meet the characteristic requirement of multimedia era display because active matrix organic LED.Therefore, active matrix organic LED display has great development potentiality, is expected to become follow-on novel planar display, thus the replacement LCD (Liquid Crystal Display, LCD).
The active matrix organic LED display panel mainly contains two kinds of production methods at present, the first utilizes thin film transistor (TFT) (TFT) technology of low temperature polycrystalline silicon (LTPS) to make, and another then is to utilize amorphous silicon (thin film transistor (TFT) (TFT) technology of α-Si) is made.Wherein, the mask-making technology that need compare multiple tracks owing to the thin film transistor (TFT) technology of low temperature polycrystalline silicon causes cost to rise.Therefore, the thin film transistor (TFT) technology of low temperature polycrystalline silicon is mainly used on the panel of small-medium size at present, and the thin film transistor (TFT) technology of amorphous silicon then is mainly used on large-sized panel.
In general, the active matrix organic LED display panel that the thin film transistor (TFT) technology made of employing low temperature polycrystalline silicon comes out, the kenel of the thin film transistor (TFT) in its image element circuit can be P type or N-type, but no matter be to select P type or N-type thin film transistor (TFT) to realize organic light-emitting diode pixel circuit, flowing through the electric current of Organic Light Emitting Diode not only can be along with the forward voltage (Voled_th) of Organic Light Emitting Diode changes through the variation of long-time stress, but also can be along with different in order to the limit voltage drift (Vth shift) of the thin film transistor (TFT) that drives Organic Light Emitting Diode.Thus, will relatedly have influence on brightness uniformity and the brightness constancy of organic light emitting diode display.
The utility model content
The utility model provides a kind of image element circuit, organic electroluminescence display panel and display device.Can effectively improve the image uniformity of organic electroluminescence display panel, can slow down the organic light-emitting device rate of decay, guarantee homogeneity and the constancy of organic electroluminescence display panel brightness.
The technical scheme that the utility model embodiment provides is as follows:
The utility model embodiment provides a kind of image element circuit, comprising: driving transistors, first memory capacitance, collecting unit, writing unit, luminescence unit; Wherein,
The source electrode of described driving transistors connects the supply voltage input end;
First end of described first memory capacitance connects the grid of described driving transistors;
Described collecting unit, first end, writing unit and luminescence unit with the first sweep signal input end, controlled low-voltage input end, driving transistors, first memory capacitance is connected respectively, be used under the control of first sweep signal, gather the threshold voltage of described driving transistors and described threshold voltage is stored in described first memory capacitance;
The said write unit, second end and collecting unit with the second sweep signal input end, data voltage input end, controlled low-voltage input end, first memory capacitance is connected respectively, be used under the control of second sweep signal, store the data voltage of described data voltage input end input;
Described luminescence unit is connected with drain electrode and the collecting unit of led control signal input end, driving transistors respectively, is used under the control of led control signal, and is luminous by the voltage driving of described data voltage and described controlled low-voltage input end input.
Preferably, described collecting unit comprises:
Transistor seconds, the 4th transistor and the 5th transistor;
The source electrode of described transistor seconds is connected with the drain electrode of described driving transistors, and the grid of described transistor seconds is connected with the described first sweep signal input end, and the drain electrode of described transistor seconds is connected with the grid of described driving transistors;
The described the 4th transistorized source electrode is connected with second end of described first memory capacitance, and the described the 4th transistorized grid is connected with the described first sweep signal input end, and described the 4th transistor drain is connected with described controlled low-voltage input end;
The described the 5th transistorized grid is connected with the described first sweep signal input end, and described the 5th transistor drain is connected with described controlled low-voltage input end.
Preferably, the said write unit comprises:
The 3rd transistor and second memory capacitance;
The described the 3rd transistorized source electrode is connected with second end of described first memory capacitance, first end of second memory capacitance, the source electrode of the 4th thin film transistor (TFT) respectively, the described the 3rd transistorized grid is connected with the described second sweep signal input end, and described the 3rd transistor drain is connected with described data voltage input end;
Second end of described second memory capacitance is connected with described controlled low-voltage input end.
Preferably, described luminescence unit comprises:
The 6th transistor and Organic Light Emitting Diode;
The described the 6th transistorized source electrode is connected with the drain electrode of described driving transistors, the source electrode of transistor seconds respectively, the described the 6th transistorized grid is connected with described led control signal input end, and described the 6th transistor drain is connected with the anode of the described the 5th transistorized source electrode, Organic Light Emitting Diode respectively;
The plus earth of described Organic Light Emitting Diode.
Preferably, described driving transistors, transistor seconds, the 3rd transistor, the 4th transistor, the 5th transistor and the 6th transistor are the P transistor npn npn.
Preferably, described controlled low-voltage input end grounding.
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.
From the above as can be seen, the image element circuit that the utility model provides, organic electroluminescence display panel and display device are by arranging driving transistors, first memory capacitance, collecting unit, writing unit, luminescence unit; Wherein, collecting unit is used under the control of first sweep signal, gathers the threshold voltage of described driving transistors and described threshold voltage is stored in described first memory capacitance; The said write unit is used under the control of second sweep signal, stores the data voltage of described data voltage input end input; Described luminescence unit is used under the control of led control signal, voltage by data voltage and the input of controlled low-voltage input end drives luminous, thereby can make organic luminescent device not be subjected to the influence of the limit voltage drift of driving transistors, can effectively improve the image uniformity of organic electroluminescence display panel, can slow down the organic light-emitting device rate of decay, guarantee homogeneity and the constancy of organic electroluminescence display panel brightness.
Description of drawings
The image element circuit structure synoptic diagram one that Fig. 1 provides for the utility model embodiment;
The image element circuit structure synoptic diagram two that Fig. 2 provides for the utility model embodiment;
The image element circuit driving method schematic flow sheet that Fig. 3 provides for the utility model embodiment;
Fig. 4 drives signal timing diagram for the image element circuit that the utility model embodiment provides;
The image element circuit structure synoptic diagram three that Fig. 5 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, those of ordinary skills belong to the scope of the utility model protection at the every other embodiment that need not to obtain under the prerequisite of creative work.
Unless define in addition, the technical term of Shi Yonging or scientific terminology should be the ordinary meaning that the personage that has general technical ability under the utility model in the field understands herein.Any order, quantity or importance do not represented in " first " of using in the utility model patent application specification and claims, " second " and similar word, and just are used for distinguishing different ingredients.Equally, restricted number do not represented in " one " or similar words such as " one " yet, but there is at least one in expression." connection " or " linking to each other " etc., similar word was not to be defined in connection physics or machinery, but can comprise electrical connection, no matter be directly or indirect." 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, then this relative position relation also correspondingly changed.
The utility model embodiment provides a kind of image element circuit, and as shown in Figure 1, this image element circuit specifically can comprise:
Driving transistors T1, the first memory capacitance C1, collecting unit 11, writing unit 12, luminescence unit 13; Wherein,
The source electrode of driving transistors T1 connects supply voltage Vdd input end;
First end of the first memory capacitance C1 connects the grid of driving transistors T1;
Collecting unit 11, first end, writing unit 12 and luminescence unit 13 with the first sweep signal Scan1 input end, controlled low-voltage Vref input end, driving transistors T1, the first memory capacitance C1 is connected respectively, be used under the control of the first sweep signal Scan1, gather the threshold voltage of driving transistors T1 and described threshold voltage vt h is stored among the first memory capacitance C1;
Writing unit 12, second end and collecting unit 11 with the second sweep signal Scan2 input end, data voltage Vdata input end, controlled low-voltage Vref input end, the first memory capacitance C1 is connected respectively, be used under the control of the second sweep signal Scan2 data voltage Vdata of storage data voltage Vdata input end input;
The pixel cell that the utility model embodiment provides can effectively improve the image uniformity of organic electroluminescence display panel, can slow down the organic light-emitting device rate of decay, guarantees homogeneity and the constancy of organic electroluminescence display panel brightness.
In an optional specific embodiment, as shown in Figure 2, collecting unit 11 specifically can comprise:
Transistor seconds T2, the 4th transistor T 4 and the 5th transistor T 5;
Wherein:
The source electrode of described transistor seconds T2 is connected with the drain electrode of driving transistors T1, the grid of transistor seconds T2 is connected with the first sweep signal Scan1 input end, and the drain electrode of transistor seconds T2 is connected (being that driving transistors T1, the first memory capacitance C1, the second thin film transistor (TFT) T2 are connected in node A) with the grid of driving transistors T1;
The source electrode of described the 4th transistor T 4 is connected with second end of the first memory capacitance C1, and the grid of the 4th transistor T 4 is connected with the first sweep signal Scan1 input end, and the drain electrode of the 4th transistor T 4 is connected with controlled low-voltage Vref input end;
The grid of the 5th transistor T 5 is connected with the first sweep signal Scan1 input end, and the drain electrode of the 5th transistor T 5 is connected with controlled low-voltage Vref input end.
In an optional embodiment, as shown in Figure 2, writing unit 12 specifically can comprise:
The 3rd transistor T 3 and the second memory capacitance C2;
Wherein:
The source electrode of the 3rd transistor T 3 is connected with the source electrode of second end of the described first memory capacitance C1, first end of the second memory capacitance C2 (namely the 3rd transistor T 3, the first memory capacitance C1, the second memory capacitance C2 are connected in Node B), the 4th thin film transistor (TFT) T4 respectively, the grid of the 3rd transistor T 3 is connected with the second sweep signal Scan2 input end, and the drain electrode of the 3rd transistor T 3 is connected with data voltage Vdata input end;
Second end of the second memory capacitance C2 is connected with controlled low-voltage Vref input end.
In an optional embodiment, as shown in Figure 2, luminescence unit 13 specifically can comprise:
The 6th transistor T 6 and Organic Light Emitting Diode (OLED);
The source electrode of the 6th transistor T 6 can be connected (being that driving transistors T1, transistor seconds T2, the 6th transistor T 6 are connected in node C) with the drain electrode of driving transistors T1, the source electrode of transistor seconds T2 respectively, the grid of the 6th transistor T 6 can be connected with led control signal Em input end, and the drain electrode of the 6th transistor T 6 can be connected (namely the 5th thin film transistor (TFT) T5, the 6th thin film transistor (TFT) T6, Organic Light Emitting Diode are connected in node D) with the source electrode of the 5th transistor T 5, the anode of Organic Light Emitting Diode respectively;
The plus earth of Organic Light Emitting Diode.
The related transistor of above-mentioned the utility model embodiment, for example driving transistors T1, transistor seconds T2, the 3rd transistor T 3, the 4th transistor T 4, the 5th transistor T 5 and the 6th transistor T 6, specifically can be the P transistor npn npn, and the source in the above-mentioned transistor, the drain electrode interchangeable.
The utility model embodiment also can provide a kind of image element driving method, and as shown in Figure 3, this method specifically can comprise:
Below, be example with the image element circuit that is applied to as shown in Figure 2, the specific implementation process of the image element driving method that the utility model embodiment is provided is described in detail.
And the signal timing diagram that is suitable among this embodiment can be as shown in Figure 4.
Namely at data acquisition phase P1, the first sweep signal Scan1 input end input low level, the second sweep signal Scan2 input end input high level, led control signal Em input end input high level;
At data input phase P2, the first sweep signal Scan1 input end input high level, the second sweep signal Scan2 input end input low level, led control signal Em input end input high level;
At glow phase P3, the first sweep signal Scan1 input end input high level, the second sweep signal Scan2 input end input high level, led control signal Em input end input low level.
Concrete:
When first stage P1, because the first sweep signal Scan1 is low level, the transistor seconds T2 that collecting unit 12 comprises, the 4th transistor T 4, the 5th transistor T 5 all can be switched on (turned-on).The base this, the second storage capacitors C2 can be reset, and controlled low-voltage Vref is stored in node D, and the anode potential of the Organic Light Emitting Diode that comprises in the luminescence unit 14 is controlled low-voltage Vref, be not in the state of positive bias, can slow down the speed of Organic Light Emitting Diode decay, the serviceable life that can improve organic electroluminescence display panel.Driving transistors T1 is the conducting of transistor seconds T2 because gathering transistor, is diode and connects, and the threshold voltage vt h of driving transistors T1 is stored among the first storage capacitors C1, and this moment, the current potential of node A was Vdd-|Vth|.
When second stage P2, because the second sweep signal Scan2 is low level, writing transistor is that the 3rd transistor T 3 is switched on (turned-on).The base this, data voltage Vdata can be stored among the second memory capacitance C2, it is negative value that the current potential of Node B becomes data voltage Vdata(data voltage Vdata), pressor effect because of the first storage capacitors C1, the current potential of node A has identical current potential and promotes, i.e. current potential=Vdd-|Vth|+Vdata-Vref of node A.This moment driving transistors T1 gate source voltage Vsg=Vdd-(Vdd-|Vth|+Vdata-Vref)=| Vth|-Vdata+Vref.
When three phases P3, because led control signal Em is low level, light emitting control transistor i.e. the 6th transistor T 6 is switched on (turned-on).At this moment, the Vsg voltage of driving transistors T1 does not change, thus, at glow phase P3, the drive current I that driving transistors T1 pipe produces
OLEDCan be expressed as equation:
Wherein, K is the current constant that is associated with driving transistors T1.
At this, can be found out by equation, at glow phase P3, the drive current I of the Organic Light Emitting Diode of flowing through
OLEDAlso uncorrelated with the threshold voltage (Vth) of driving transistors T1.In addition, can find out the drive current I of the Organic Light Emitting Diode that determines to flow through again at equation
OLEDAdditionally had more a V parameter ref, and the variable element Vref that this additionally has more can slow down Organic Light Emitting Diode through the long-time phenomenon of using the brightness decay that causes, and the drive current I of the Organic Light Emitting Diode that determines to flow through
OLEDBe not subjected to the control of Vdd, in other words, it is not subjected to the influence of IR drop.Thereby can guarantee homogeneity and the constancy of organic electroluminescence display panel brightness.
So as seen, the image element circuit that the utility model embodiment provides, by control signal wire the diode of driving transistors T1 is connected, finish the storage of driving transistors T1 threshold voltage vt h, make it not be subjected to the influence that driving transistors T1 threshold voltage vt h raises and power lead VDD I-R Drop causes.
Finish the storage of variable voltage Vref by the effectiveness of boosting of electric capacity, make Organic Light Emitting Diode not be in the positive bias state for a long time, thereby slow down the speed of Organic Light Emitting Diode decay.
In the utility model one optional embodiment, also can be with the controlled low-voltage Vref input end grounding in the above-mentioned image element circuit, its advantage is to reduce relevant control voltage, simplifies the design difficulty of relevant IC.Detailed circuit diagram is seen Fig. 5, and principle of work and top scheme are similar, repeat no more again.
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 pixel electrode 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.
The utility model provides a kind of image element circuit, organic electroluminescence display panel and display device, by driving transistors T1, the first memory capacitance C1, collecting unit, writing unit, luminescence unit are set; Wherein, collecting unit is used under the control of first sweep signal, gathers the threshold voltage of described driving transistors T1 and described threshold voltage is stored among the described first memory capacitance C1; The said write unit is used under the control of second sweep signal, stores the data voltage of described data voltage input end input; Described luminescence unit is used under the control of led control signal, and is luminous by the voltage driving of described data voltage and described controlled low-voltage input end input.Thereby can make organic luminescent device not be subjected to the influence of the limit voltage drift of driving transistors, can effectively improve the image uniformity of organic electroluminescence display panel, can slow down the organic light-emitting device rate of decay, guarantee homogeneity and the constancy of organic electroluminescence display panel brightness.
The above only is 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 (8)
1. an image element circuit is characterized in that, comprising: driving transistors, first memory capacitance, collecting unit, writing unit, luminescence unit; Wherein,
The source electrode of described driving transistors connects the supply voltage input end;
First end of described first memory capacitance connects the grid of described driving transistors;
Described collecting unit, first end, writing unit and luminescence unit with the first sweep signal input end, controlled low-voltage input end, driving transistors, first memory capacitance is connected respectively, be used under the control of first sweep signal, gather the threshold voltage of described driving transistors and described threshold voltage is stored in described first memory capacitance;
The said write unit, second end and collecting unit with the second sweep signal input end, data voltage input end, controlled low-voltage input end, first memory capacitance is connected respectively, be used under the control of second sweep signal, store the data voltage of described data voltage input end input;
Described luminescence unit is connected with drain electrode and the collecting unit of led control signal input end, driving transistors respectively, is used under the control of led control signal, and is luminous by the voltage driving of described data voltage and described controlled low-voltage input end input.
2. image element circuit as claimed in claim 1 is characterized in that, described collecting unit comprises:
Transistor seconds, the 4th transistor and the 5th transistor;
The source electrode of described transistor seconds is connected with the drain electrode of described driving transistors, and the grid of described transistor seconds is connected with the described first sweep signal input end, and the drain electrode of described transistor seconds is connected with the grid of described driving transistors;
The described the 4th transistorized source electrode is connected with second end of described first memory capacitance, and the described the 4th transistorized grid is connected with the described first sweep signal input end, and described the 4th transistor drain is connected with described controlled low-voltage input end;
The described the 5th transistorized grid is connected with the described first sweep signal input end, and described the 5th transistor drain is connected with described controlled low-voltage input end.
3. image element circuit as claimed in claim 2 is characterized in that, the said write unit comprises:
The 3rd transistor and second memory capacitance;
The described the 3rd transistorized source electrode is connected with second end of described first memory capacitance, first end of second memory capacitance, the source electrode of the 4th thin film transistor (TFT) respectively, the described the 3rd transistorized grid is connected with the described second sweep signal input end, and described the 3rd transistor drain is connected with described data voltage input end;
Second end of described second memory capacitance is connected with described controlled low-voltage input end.
4. image element circuit as claimed in claim 3 is characterized in that, described luminescence unit comprises:
The 6th transistor and Organic Light Emitting Diode;
The described the 6th transistorized source electrode is connected with the drain electrode of described driving transistors, the source electrode of transistor seconds respectively, the described the 6th transistorized grid is connected with described led control signal input end, and described the 6th transistor drain is connected with the anode of the described the 5th transistorized source electrode, Organic Light Emitting Diode respectively;
The plus earth of described Organic Light Emitting Diode.
5. as each described image element circuit of claim 1 to 4, it is characterized in that described driving transistors, transistor seconds, the 3rd transistor, the 4th transistor, the 5th transistor and the 6th transistor are the P transistor npn npn.
6. image element circuit as claimed in claim 1 is characterized in that, described controlled low-voltage input end grounding.
7. an organic electroluminescence display panel is characterized in that, comprises each image element circuit of described claim 1-6.
8. a display device is characterized in that, comprises organic electroluminescence display panel as claimed in claim 7.
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| CN2013201553864U CN203134329U (en) | 2013-03-29 | 2013-03-29 | Pixel circuit, organic light emitting display panel and display device |
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| CN2013201553864U CN203134329U (en) | 2013-03-29 | 2013-03-29 | Pixel circuit, organic light emitting display panel and display device |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103198794A (en) * | 2013-03-29 | 2013-07-10 | 京东方科技集团股份有限公司 | Pixel circuit, drive method, organic luminance display panel and display device thereof |
| CN107274828A (en) * | 2017-06-09 | 2017-10-20 | 京东方科技集团股份有限公司 | A kind of image element circuit and its driving method, display device |
-
2013
- 2013-03-29 CN CN2013201553864U patent/CN203134329U/en not_active Withdrawn - After Issue
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103198794A (en) * | 2013-03-29 | 2013-07-10 | 京东方科技集团股份有限公司 | Pixel circuit, drive method, organic luminance display panel and display device thereof |
| US9570000B2 (en) | 2013-03-29 | 2017-02-14 | Boe Technology Group Co., Ltd. | Pixel circuit and driving method thereof, organic light-emitting display panel and display apparatus |
| CN107274828A (en) * | 2017-06-09 | 2017-10-20 | 京东方科技集团股份有限公司 | A kind of image element circuit and its driving method, display device |
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