CN101697268B - Organic light emitting diode display, pixel circuit and data current writing method - Google Patents
Organic light emitting diode display, pixel circuit and data current writing method Download PDFInfo
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Abstract
The invention discloses an organic light emitting diode display, a pixel circuit and a data current writing method, wherein the organic light emitting diode display comprises: the pixel structure comprises a data line, a current sensing line, a power line and a plurality of pixels electrically coupled to the data line, the current sensing line and the power line. In the process of writing data current into the selected pixel in the pixels, the selected pixel draws current from the current sensing line, the data line provides specific data voltage to the selected pixel according to the current drawn from the current sensing line until the current drawn from the current sensing line is matched with the data current, and the rest unselected pixels in the pixels draw current from the power line. The invention also provides a pixel circuit and a data current writing method which are suitable for the active matrix organic light-emitting diode display.
Description
Technical field
The invention relates to Organic Light Emitting Diode display technique field, and particularly relevant for a kind of organic light emitting diode display and image element circuit and data current write method.
Background technology
Press; For organic light emitting diode display; Adopting low temperature polycrystalline silicon (LTPS) problem that processing procedure met with is to cause the threshold voltage between each transistor inconsistent, causes driving the electric current that the transistor of Organic Light Emitting Diode flows through and there are differences, and then cause the brightness disproportionation of display; The problem that adopts the amorphous silicon membrane processing procedure to be run into then is that the transistorized threshold voltage that drives Organic Light Emitting Diode can change under long-time the use.In addition, there is problem of aging Organic Light Emitting Diode in itself, and luminescence efficiency can descend in time.
For improving the brightness influence that above-mentioned each factor causes, U.S.'s publication application has the active matrix organic LED display that proposes a kind of improvement for 2008/0136338A1 number, and the content that it disclosed at this as a reference.Referring to Fig. 1, this active matrix organic LED display comprises control circuit 21, data line 22, electric current line 24 and a plurality of pixel 23.Control circuit 21 comprises power supply/sensing module (source/sensing module) 211 and data adjusting module (data programming module) 213.
Wherein, power supply/sensing module 211 comprises amplifier Amp1, P transistor npn npn Msense and Msource, switching transistor MS1 and capacitor C S1; The output terminal of amplifier Amp1 is electrically coupled to the grid of transistor Msense and sees through the grid that switching transistor MS1 is electrically coupled to Msource; Non-inverting input is electrically coupled to decides voltage Vcol; Inverting input is electrically coupled to node nc, the voltage on the node nc except the adjustment period between exist to remain the little change and decide voltage Vcol.When switching transistor MS1 conducting, the grid voltage of transistor Msense and Msource is set up the electric current that extracts with response current line 24; When electric current line 24 begins to extract more multiple current, the voltage on the inverting input of node nc and corresponding amplifier Amp1 changes; Go up the voltage change in order to respond any node nc; The grid voltage that amplifier Amp1 regulates transistor Msense and Msource flows through the electric current of transistor Msense and Msource with adjusting, and the grid voltage that the change in voltage on the output terminal of amplifier Amp1 changes transistor Msense and Msource until the electric current that flows through transistor Msense and Msource with extract electric current and be complementary.In addition, capacitor C S1 is electrically coupled between the grid and drain electrode of transistor Msource, so that the grid voltage of transistor Msource remains unchanged when switching transistor MS1 ends.
A plurality of pixels 23 are configured to the circuit structure of two-transistor one electric capacity (2T1C) respectively and specifically comprise N type driving transistors M21, switching transistor M22, Organic Light Emitting Diode 232 and storage capacitors Cs; The grid of driving transistors M21 sees through switching transistor M22 and is electrically coupled to data line 22, and its source electrode is electrically coupled to the positive pole of light emitting diode 232, and its drain electrode is electrically coupled to electric current line 24; Storage capacitors Cs is electrically coupled between the grid and source electrode of driving transistors M21.
Between one the adjustment period; Single pixel is chosen and is chosen the switching transistor M22 conducting of pixel, and the driving transistors M21 of power supply/sensing module 211, data adjusting module 213 and selected pixel 23 sees through the electric current line 24 and the data line 22 that are coupled to node nc and forms feedback loop; When data current Idata injects node nc; Utilize the transistor Msense in power supply/sensing module 211 to go the change in voltage on the sense node nc; The output terminal that sees through the amplifier Amp2 in the data adjusting module 213 again provides particular data voltage to the grid of driving transistors M21 to be complementary from the electric current of electric current line 24 extractions and the data current Idata of injection until driving transistors M21, is compensated so that be chosen the pixel current of pixel.
Only; For above-mentioned active matrix organic LED display because electric current line 24 is made the usefulness that current sense and supply voltage provide simultaneously, though the adjustment period between have only single pixel to be chosen to carry out the pixel current compensation; But the driving transistors of other pixel all still continues to flow through electric current; So the electric current on the whole piece electric current line is very big, electric current is minimum comparatively speaking for single desire compensation pixel, can't guarantee that the electric current of desiring to flow through is that offset current still is the current affects that noise causes.
Summary of the invention
One of the object of the invention is providing a kind of active matrix organic LED display exactly, to increase the current compensation accuracy of desiring compensation pixel.
A purpose more of the present invention provides a kind of image element circuit, is applicable to active matrix organic LED display, to increase the current compensation accuracy of desiring compensation pixel.
Another purpose of the present invention provides a kind of data current write method, is suitable for being executed in active matrix organic LED display, to increase the current compensation accuracy of desiring compensation pixel.
A kind of active matrix organic LED that one embodiment of the invention proposes, it comprises: data line, current sense line, power lead and a plurality of pixels that are electrically coupled to data line, current sense line and power lead.Wherein, Write in the process of the selected pixel in the above-mentioned pixel at data current; Selected pixel is from current sense line extraction electric current; Data line is according to providing particular data voltage to selected pixel to be complementary until extraction electric current and data current from the current sense line from the extraction electric current of current sense line, and in the above-mentioned pixel remaining selected pixel then from power lead extraction electric current and luminous.
In one embodiment of this invention, above-mentioned selected pixel comprises: driving transistors, first switching transistor, second switch transistor, the 3rd switching transistor, storage capacitors and Organic Light Emitting Diode.Wherein, one in the source electrode of first switching transistor and the drain electrode is electrically coupled to the grid of driving transistors, and another person in the source electrode of first switching transistor and the drain electrode is electrically coupled to data line; Another person in the source electrode that in the transistorized source electrode of second switch and the drain electrode is electrically coupled to driving transistors and the drain electrode, the transistorized source electrode of second switch is electrically coupled to power lead with another person in the drain electrode; Another person in the source electrode that in the source electrode of the 3rd switching transistor and the drain electrode is electrically coupled to driving transistors and the drain electrode, the source electrode of the 3rd switching transistor is electrically coupled to the current sense line with another person in the drain electrode; In the source electrode that the positive pole of Organic Light Emitting Diode is electrically coupled to driving transistors and the drain electrode one, the negative pole of Organic Light Emitting Diode is electrically coupled to preset potential.Moreover; Write in the process of selected pixel at data current; The first switching transistor conducting so that the particular data store voltages in storage capacitors and the transistorized conduction status of controlling and driving; The second switch transistor is in cut-off state, the 3rd switching transistor conducting, and Organic Light Emitting Diode sees through driving transistors and the 3rd switching transistor from current sense line extraction electric current.In addition, the grid control signal anti-phase each other of second switch transistor AND gate the 3rd switching transistor.Further, selected pixel more comprises building-out capacitor, is electrically coupled between the negative pole of source electrode and another person and Organic Light Emitting Diode in the drain electrode of driving transistors.
A kind of image element circuit that yet another embodiment of the invention proposes is applicable to active matrix organic LED, and active matrix organic LED comprises data line, current sense line and power lead; Image element circuit comprises: driving transistors, first switching transistor, second switch transistor, the 3rd switching transistor, storage capacitors and Organic Light Emitting Diode.Wherein, one in the source electrode of first switching transistor and the drain electrode is electrically coupled to the grid of driving transistors, and another person in the source electrode of first switching transistor and the drain electrode is electrically coupled to data line; Another person in the source electrode that in the transistorized source electrode of second switch and the drain electrode is electrically coupled to driving transistors and the drain electrode, the transistorized source electrode of second switch is electrically coupled to power lead with another person in the drain electrode; Another person in the source electrode that in the source electrode of the 3rd switching transistor and the drain electrode is electrically coupled to driving transistors and the drain electrode, the source electrode of the 3rd switching transistor is electrically coupled to the current sense line with another person in the drain electrode; Storage capacitors is electrically coupled to according to the kind of driving transistors between the grid of driving transistors and one and the source electrode and the corresponding person among another person in the drain electrode in source electrode and the drain electrode; In the source electrode that the positive pole of Organic Light Emitting Diode is electrically coupled to driving transistors and the drain electrode one, the negative pole of Organic Light Emitting Diode is electrically coupled to preset potential.Moreover in the course of work of active matrix organic LED display, the conduction and cut-off state of second switch transistor AND gate the 3rd switching transistor decision Organic Light Emitting Diode extracts what person from current sense line and power lead electric current; One of write in the said pixel in the process of selected pixel at a data current; Described selected pixel is from described current sense line extraction electric current; Described data line provides particular data voltage to described selected pixel to be complementary until described extraction electric current and described data current from described current sense line according to the described extraction electric current from described current sense line, and the then described power lead extraction electric current of remaining selected pixel and luminous in the described pixel.In addition, the grid control signal anti-phase each other of second switch transistor AND gate the 3rd switching transistor.Further, image element circuit more comprises building-out capacitor, is electrically coupled between the negative pole of source electrode and another person and Organic Light Emitting Diode in the drain electrode of driving transistors.
A kind of data current write method that further embodiment of this invention proposes; Be suitable for being executed in active matrix organic LED, active matrix organic LED comprises data line, current sense line, power lead and a plurality of pixels that are electrically coupled to data line, current sense line and power lead; Data current write method comprises step: in the data current ablation process; Selected pixel in the above-mentioned pixel of activation is from current sense line extraction electric current, and described data line provides particular data voltage to described selected pixel to be complementary until described extraction electric current and described data current from described current sense line according to the described extraction electric current from described current sense line; And when data current write finish after, will select pixel and switch to from power lead and extract electric current.Further, data current write method more can comprise step: in the data current ablation process, remaining selected pixel extracts electric current and luminous from power lead in the above-mentioned pixel.Wherein, Described selected pixel comprises: a driving transistors, one first switching transistor, a second switch transistor, one the 3rd switching transistor, a storage capacitors, an Organic Light Emitting Diode and a building-out capacitor, and described data current write method comprises step:
Make one in source electrode that the grid of described driving transistors is electrically coupled to described first switching transistor and the drain electrode; In the positive pole that in the source electrode of described driving transistors and the drain electrode is electrically coupled to described Organic Light Emitting Diode, the source electrode that the source electrode of described driving transistors and another person in the drain electrode are electrically coupled to one in the transistorized source electrode of described second switch and the drain electrode and described the 3rd switching transistor and drain electrode one;
Make the source electrode of described first switching transistor, described second switch transistor and described the 3rd switching transistor and another person in the drain electrode be electrically coupled to described data line, described power lead and described current sense line respectively;
Make the negative pole of described Organic Light Emitting Diode be electrically coupled to a preset potential;
Make one and described source electrode in described storage capacitors optionally is electrically coupled to described driving transistors according to the kind of described driving transistors described grid and described source electrode and the drain electrode and drain in another person in one of between the corresponding person;
Described building-out capacitor is electrically coupled between the described negative pole of described source electrode and another person and described Organic Light Emitting Diode in the drain electrode of described driving transistors; And
In described data current ablation process; The described selected pixel of activation comprises from the step of described current sense line extraction electric current: described first switching transistor of conducting and described the 3rd switching transistor also end described second switch transistor, and described data line provides the grid of the described driving transistors of particular data voltage to described selected pixel to be complementary until described extraction electric current and described data current from described current sense line according to the described extraction electric current from described current sense line.
Current sense line that the above embodiment of the present invention utilization branch is arranged and power lead are made the usefulness that current sense and supply voltage provide respectively; Make and write when compensating its pixel current a certain selected pixel being carried out data current; All the other selected pixels that are in luminance then extract electric current from power lead from current sense line extraction electric current to allow selected pixel; Thereby can let the electric current of desire compensation only flow through selected pixel, avoid all the other not selected light emitting pixels to have influence on the compensation accuracy; Therefore, the embodiment of the invention can effectively increase the current compensation accuracy of desiring compensation pixel.In addition, by in image element circuit, setting up building-out capacitor, can effectively compensate the influence that interior resistance drop (IR drop) causes.
For let above-mentioned and other purposes of the present invention, feature and advantage can be more obviously understandable, hereinafter is special lifts preferred embodiment, and cooperates appended graphicly, elaborates as follows.
Description of drawings
Fig. 1 is the partial circuit diagram of existing active matrix organic LED display.
Fig. 2 is the partial circuit diagram of a kind of active matrix organic LED display of the embodiment of the invention.
Fig. 3 is the partial circuit diagram of the another kind of active matrix organic LED display of the embodiment of the invention.
The main element symbol description:
20: active matrix organic LED display
21: control circuit
211: power supply/sensing module
213: the data adjusting module
22: data line
23: pixel
232: Organic Light Emitting Diode
24: the electric current line
Vdd: supply voltage
Vcol: decide voltage
Msense, Msource: transistor
MS1, MS2: switching transistor
CS1, CS2: electric capacity
Amp1, Amp2: amplifier
Nc: node
Idata: data current
M21: driving transistors
M22: switching transistor
Cs: storage capacitors
10: active matrix organic LED display
11: control circuit
12: data line
14: the current sense line
16: power lead
17: Organic Light Emitting Diode
Vdata: particular data voltage
P1, P2, P3: pixel
M11: driving transistors
M12, M13, M14: switching transistor
Cb: building-out capacitor
Embodiment
For making the object of the invention, technical scheme and advantage clearer, the embodiment of the invention is further elaborated below in conjunction with Figure of description.At this, illustrative examples of the present invention and explanation thereof are used to explain the present invention, but not as to qualification of the present invention.
With reference to figure 2, it illustrates the partial circuit diagram of a kind of active matrix organic LED display that is relevant to the embodiment of the invention.A plurality of pixels in the one row pixel only are shown with as for example among Fig. 2, but are not to be used for limiting the present invention; It will be appreciated by persons skilled in the art that active matrix organic LED display generally includes the pixel that is matrix-style (for example, linescan method) arrangement in a large number.
As shown in Figure 2, active matrix organic LED display 10 comprises control circuit 11, data line 12, current sense line 14, power lead 16 and a plurality of pixel P1, P2 and P3.Pixel P1, P2 and P3 all are electrically coupled to data line 12, current sense line 14 and power lead 16; Data line 12 and current sense line 14 are electrically coupled to control circuit 11.Wherein, the physical circuit of control circuit 11 can be identical with the control circuit 21 among Fig. 1, and it can comprise power supply/sensing module 211 and data adjusting module 213 equally; Correspondingly, data line 12 and current sense line 14 can be identical with the electrical connection of control circuit 21 with data line among Fig. 1 22 and electric current line 24 with the electrical connection of control circuit 11; Therefore, control circuit 11 can compensate the pixel current of selecting pixel according to the change in voltage (for example, the change in voltage on the node nc among Fig. 1) that inside senses.
Pixel P1, P2 and P3 are configured to the circuit structure of four transistors, one electric capacity (4T1C) and comprise driving transistors M11, switching transistor M12, M13 and M14 and Organic Light Emitting Diode 17.More specifically, the drain electrode of switching transistor M12 is electrically coupled to data line 12, and the source electrode of switching transistor M12 is electrically coupled to the grid of driving transistors M11; The drain electrode of switching transistor M13 is electrically coupled to power lead 16, and the source electrode of switching transistor M13 is electrically coupled to the drain electrode of driving transistors M11; The drain electrode of switching transistor M14 is electrically coupled to current sense line 14, and the source electrode of switching transistor M14 is electrically coupled to the drain electrode of driving transistors M11; The source electrode of driving transistors M11 is electrically coupled to the positive pole of Organic Light Emitting Diode 17, and the negative pole of Organic Light Emitting Diode 17 for example is electrically coupled to preset potential, earthing potential.Storage capacitors Cs system is electrically coupled to according to the kind of driving transistors M11 between the grid and the corresponding person in source electrode and the drain electrode of driving transistors M11; For example the driving transistors M11 among Fig. 2 is the P transistor npn npn, and then storage capacitors Cs is electrically coupled between the grid and drain electrode of driving transistors M11.
In running order following at active matrix organic LED display 10; Write a certain selected pixel (for example pixel P1) so that selected pixel is carried out in the process of current compensation at data current Idata; Selected pixel P1 is enabled and extracts electric current from current sense line 14; Control circuit 11 detects the extraction electric current on the current sense lines 14 and produces particular data voltage Vdata and provide to selected pixel P1 to data line 12 and by data line 12 and be complementary until extraction electric current and data current Idata from current sense line 14 according to changing from the extraction electric current on the current sense line 14; All the other selected pixel P2 and P3 then extract electric currents and luminous from power lead 16, and then accomplish the compensation to the pixel current of selected pixel P1.When data current Idata write finish after, selected pixel P1 will be switched to from power lead 16 extracts electric currents and luminous.
More specifically; Write in the process of selected pixel P1 at data current Idata; The switching transistor M12 conducting of selected pixel P1 so that control circuit 11 produces and by the particular data voltage Vdata that data line 12 provides see through the conduction status that switching transistor M12 is stored in storage capacitors Cs and controlling and driving transistor M11 (that is; The size of current system of flowing through driving transistors M11 changes along with the change of particular data voltage Vdata); The switching transistor M13 of selected pixel P1 is in cut-off state and switching transistor M14 conducting, thereby the Organic Light Emitting Diode of selected pixel P1 17 sees through driving transistors M11 and switching transistor M14 extracts electric current from current sense line 14; And for not selected pixel P2 and P3; Switching transistor M12 and M14 are in cut-off state and switching transistor M13 conducting, extract electric currents and luminous thereby the Organic Light Emitting Diode 17 of selected pixel P2 and P2 sees through driving transistors M11 and switching transistor M13 from power lead 16.
By on can know the conduction and cut-off state of switching transistor M14 and M13 decision Organic Light Emitting Diode 17 extracts electric current, the anti-phase each other of the grid control signal of switching transistor M13 and M14 from current sense line 14 with what person the power lead 16.In addition, switching transistor M12 can see through horizontal scanning line (not illustrating among the figure) and control its conduction and cut-off state.
In addition, because Organic Light Emitting Diode 17 is a current driving element, being provided by power lead 16 under the situation of supply voltage to have electric current because of power lead 16 upper reaches; Add the stray resistance effect on the whole piece power lead 16; Internal resistance (IR, internal resistance) can cause the decline of supply voltage Vdd, causes between the gate-to-source of driving transistors M11 voltage (Vgs) and expects difference to some extent; The large scale display panel in it resistance drop (IR drop also claims that supply voltage falls) particularly serious.
For effectively compensating the influence that interior resistance drop causes; Referring to Fig. 3; Each pixel P1 of the active matrix organic LED display 10 of the embodiment of the invention; P2 and P3 also can further comprise building-out capacitor Cb, and building-out capacitor Cb is electrically coupled between the negative pole of drain electrode and Organic Light Emitting Diode 17 of driving transistors M11.At this; Pixel P1, P2 and P3 are configured to the 4T2C circuit structure, see through set up building-out capacitor Cb remember in voltage differences on the power lead 16 that causes of resistance drop; In data current Idata ablation process; By change in voltage (being relevant to the size of current that extracts from current sense line 14 changes) and the inner compensating effect that control circuit 11 inside sense, adjust the size of particular data voltage Vdata, reach the effect of resistance drop in the compensation.
In sum; Current sense line that the above embodiment of the present invention utilization branch is arranged and power lead are made the usefulness that current sense and supply voltage provide respectively; Make and write when compensating its pixel current a certain selected pixel being carried out data current; All the other selected pixels that are in luminance then extract electric current from power lead from current sense line extraction electric current to allow selected pixel; Thereby can let the electric current of desire compensation only flow through selected pixel, avoid all the other not selected light emitting pixels to have influence on the compensation accuracy; Therefore, the embodiment of the invention can effectively increase the current compensation accuracy of desiring compensation pixel.In addition, see through and in each image element circuit, set up building-out capacitor, the influence that resistance drop causes in can effectively compensating.
In addition; Anyly have the knack of this art and also can do suitable change, for example suitably change the circuit structure, each transistorized kind (P type or N type) of circuit structure, each pixel of control circuit, electrical connection exchange of each transistorized source electrode and drain electrode or the like to the active matrix organic LED display that the embodiment of the invention proposes.
Though the present invention discloses as above with preferred embodiment; Right its is not in order to limiting the present invention, anyly has the knack of this art, do not breaking away from the spirit and scope of the present invention; When can doing a little change and retouching, so protection scope of the present invention is as the criterion when looking the claim person of defining.
Claims (6)
1. an active matrix organic LED display is characterized in that, described active matrix organic LED display comprises:
One data line;
One current sense line;
One power lead; And
A plurality of pixels are electrically coupled to described data line, described current sense line and described power lead;
Wherein, One of write in the said pixel in the process of selected pixel at a data current; Described selected pixel is from described current sense line extraction electric current; Described data line provides particular data voltage to described selected pixel to be complementary until described extraction electric current and described data current from described current sense line according to the described extraction electric current from described current sense line, and the then described power lead extraction electric current of remaining selected pixel and luminous in the described pixel;
Described selected pixel comprises:
One driving transistors;
One first switching transistor, one in the source electrode of described first switching transistor and the drain electrode is electrically coupled to the grid of described driving transistors, and another person in the source electrode of described first switching transistor and the drain electrode is electrically coupled to described data line;
One second switch transistor; Another person in the source electrode that in the transistorized source electrode of described second switch and the drain electrode is electrically coupled to described driving transistors and the drain electrode, the transistorized source electrode of described second switch is electrically coupled to described power lead with another person in the drain electrode;
One the 3rd switching transistor; Another person in the described source electrode that in the source electrode of described the 3rd switching transistor and the drain electrode is electrically coupled to described driving transistors and the drain electrode, the source electrode of described the 3rd switching transistor is electrically coupled to described current sense line with another person in the drain electrode;
One storage capacitors; And
In the source electrode that one Organic Light Emitting Diode, the positive pole of described Organic Light Emitting Diode are electrically coupled to described driving transistors and the drain electrode one, the negative pole of described Organic Light Emitting Diode is electrically coupled to a preset potential;
Wherein, Write in the process of described selected pixel at described data current; The described first switching transistor conducting so that described particular data store voltages in described storage capacitors and control the conduction status of described driving transistors; Described second switch transistor is in cut-off state, described the 3rd switching transistor conducting, and described Organic Light Emitting Diode sees through described driving transistors and described the 3rd switching transistor from described current sense line extraction electric current;
Described selected pixel also comprises a building-out capacitor, and described building-out capacitor is electrically coupled between the described negative pole of described source electrode and another person and described Organic Light Emitting Diode in the drain electrode of described driving transistors.
2. active matrix organic LED display as claimed in claim 1 is characterized in that, the grid control signal anti-phase each other of described the 3rd switching transistor of described second switch transistor AND gate.
3. an image element circuit is applicable to an active matrix organic LED display, and described active matrix organic LED display comprises a data line, a current sense line and a power lead, it is characterized in that, described image element circuit comprises:
One driving transistors;
One first switching transistor, one in the source electrode of described first switching transistor and the drain electrode is electrically coupled to the grid of described driving transistors, and another person in the source electrode of described first switching transistor and the drain electrode is electrically coupled to described data line;
One second switch transistor; Another person in the source electrode that in the transistorized source electrode of described second switch and the drain electrode is electrically coupled to described driving transistors and the drain electrode, the transistorized source electrode of described second switch is electrically coupled to described power lead with another person in the drain electrode;
One the 3rd switching transistor; Another person in the described source electrode that in the source electrode of described the 3rd switching transistor and the drain electrode is electrically coupled to described driving transistors and the drain electrode, the source electrode of described the 3rd switching transistor is electrically coupled to described current sense line with another person in the drain electrode;
One and described source electrode in one storage capacitors, described storage capacitors are electrically coupled to described driving transistors according to the kind of described driving transistors described grid and source electrode and the drain electrode and drain in another person in one of between the corresponding person; And
In the described source electrode that one Organic Light Emitting Diode, the positive pole of described Organic Light Emitting Diode are electrically coupled to described driving transistors and the drain electrode one, the negative pole of described Organic Light Emitting Diode is electrically coupled to a preset potential;
In the course of work of described active matrix organic LED display, the conduction and cut-off state of described the 3rd switching transistor of described second switch transistor AND gate determines what person of described Organic Light Emitting Diode from described current sense line and described power lead to extract electric current;
One of write in the said pixel in the process of selected pixel at a data current; Described selected pixel is from described current sense line extraction electric current; Described data line provides particular data voltage to described selected pixel to be complementary until described extraction electric current and described data current from described current sense line according to the described extraction electric current from described current sense line, and the then described power lead extraction electric current of remaining selected pixel and luminous in the described pixel;
Described image element circuit also comprises a building-out capacitor, and described building-out capacitor is electrically coupled between the described negative pole of described source electrode and another person and described Organic Light Emitting Diode in the drain electrode of described driving transistors.
4. image element circuit as claimed in claim 3 is characterized in that, the grid control signal anti-phase each other of described the 3rd switching transistor of described second switch transistor AND gate.
5. data current write method; Be executed in an active matrix organic LED display; Described active matrix organic LED display comprises a data line, a current sense line, a power lead and a plurality of pixel, and described pixel is electrically coupled to described data line, described current sense line and described power lead; It is characterized in that described data current write method comprises step:
In a data current ablation process; Selected pixel is from described current sense line extraction electric current one of in the described pixel of activation, and described data line provides particular data voltage to described selected pixel to be complementary until described extraction electric current and described data current from described current sense line according to the described extraction electric current from described current sense line; And
When described data current write finish after, described selected pixel switched to from described power lead extracts electric current;
Described selected pixel comprises: a driving transistors, one first switching transistor, a second switch transistor, one the 3rd switching transistor, a storage capacitors, an Organic Light Emitting Diode and a building-out capacitor, and described data current write method comprises step:
Make one in source electrode that the grid of described driving transistors is electrically coupled to described first switching transistor and the drain electrode; In the positive pole that in the source electrode of described driving transistors and the drain electrode is electrically coupled to described Organic Light Emitting Diode, the source electrode that the source electrode of described driving transistors and another person in the drain electrode are electrically coupled to one in the transistorized source electrode of described second switch and the drain electrode and described the 3rd switching transistor and drain electrode one;
Make the source electrode of described first switching transistor, described second switch transistor and described the 3rd switching transistor and another person in the drain electrode be electrically coupled to described data line, described power lead and described current sense line respectively;
Make the negative pole of described Organic Light Emitting Diode be electrically coupled to a preset potential;
Make one and described source electrode in described storage capacitors optionally is electrically coupled to described driving transistors according to the kind of described driving transistors described grid and described source electrode and the drain electrode and drain in another person in one of between the corresponding person;
Described building-out capacitor is electrically coupled between the described negative pole of described source electrode and another person and described Organic Light Emitting Diode in the drain electrode of described driving transistors; And
In described data current ablation process; The described selected pixel of activation comprises from the step of described current sense line extraction electric current: described first switching transistor of conducting and described the 3rd switching transistor also end described second switch transistor, and described data line provides the grid of the described driving transistors of particular data voltage to described selected pixel to be complementary until described extraction electric current and described data current from described current sense line according to the described extraction electric current from described current sense line.
6. data current write method as claimed in claim 5; It is characterized in that; Described data current write method also comprises step: in described data current ablation process, remaining not selected pixel extracts electric current from described power lead in the described pixel.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2009101766784A CN101697268B (en) | 2009-09-24 | 2009-09-24 | Organic light emitting diode display, pixel circuit and data current writing method |
Applications Claiming Priority (1)
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| CN2009101766784A CN101697268B (en) | 2009-09-24 | 2009-09-24 | Organic light emitting diode display, pixel circuit and data current writing method |
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| CN103236237B (en) * | 2013-04-26 | 2015-04-08 | 京东方科技集团股份有限公司 | Pixel unit circuit and compensating method of pixel unit circuit as well as display device |
| CN107180613B (en) * | 2017-05-26 | 2019-03-12 | 京东方科技集团股份有限公司 | Organic LED display panel and its driving method |
| CN107610643B (en) * | 2017-09-29 | 2020-11-10 | 京东方科技集团股份有限公司 | Compensation circuit, control method thereof, display panel and display device |
| TWI653617B (en) * | 2017-10-13 | 2019-03-11 | 友達光電股份有限公司 | Pixel circuit and driving method |
| CN113077760B (en) * | 2017-12-11 | 2022-11-01 | 成都晶砂科技有限公司 | Driving method of pixel driving circuit |
| KR102520563B1 (en) * | 2018-11-07 | 2023-04-10 | 엘지디스플레이 주식회사 | Driving voltage sensing circuit and display device using it |
| CN109599060B (en) * | 2019-01-11 | 2020-12-18 | 京东方科技集团股份有限公司 | Pixel compensation method, pixel compensation system and display device |
| CN110428776B (en) * | 2019-08-14 | 2021-03-19 | 京东方科技集团股份有限公司 | Pixel circuit, detection method, display panel and display device |
| WO2021035716A1 (en) * | 2019-08-30 | 2021-03-04 | 京东方科技集团股份有限公司 | Display substrate and display panel |
| CN110992884B (en) * | 2019-12-24 | 2021-07-09 | 武汉天马微电子有限公司 | Display panel, display device and detection compensation method of display panel |
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