CN102708790A - Pixel unit driving circuit and method, pixel unit and display device - Google Patents
Pixel unit driving circuit and method, pixel unit and display device Download PDFInfo
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- CN102708790A CN102708790A CN2011103939874A CN201110393987A CN102708790A CN 102708790 A CN102708790 A CN 102708790A CN 2011103939874 A CN2011103939874 A CN 2011103939874A CN 201110393987 A CN201110393987 A CN 201110393987A CN 102708790 A CN102708790 A CN 102708790A
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Abstract
The invention provides a pixel unit driving circuit, a pixel unit driving method, a pixel unit and a display device. The pixel unit driving circuit comprises a driving thin film transistor, a first switch element, a storage capacitor and a driving control unit, wherein the gate of the driving thin film transistor is connected with the first end of the storage capacitor and respectively connected with the drain of the driving thin film transistor and the low level output end of a driving power supply through the driving control unit; the second end of the storage capacitor is connected with the high level output end of the driving power supply; the source of the driving thin film transistor is connected with a negative electrode of an organic light emitting diode (OLED) through the first switch element and connected with a data wire through the driving control unit; and the drain of the driving thin film transistor is connected with the low level output end of the driving power supply through the driving control unit. The driving thin film transistor is guaranteed to work in a saturated region, and voltages of the gate and the source of the driving thin film transistor compensate for threshold voltage by controlling charging and discharging of the storage capacitor, so that the brightness of an OLED panel is uniform, and the problem of brightness attenuation is solved.
Description
Technical field
The present invention relates to the organic light emitting display field, relate in particular to pixel cell driving circuit and method, pixel cell and the display device of a kind of AMOLED (active matrix organic light-emitting diode).
Background technology
Existing pixel cell driving circuit is as shown in Figure 1; This driving circuit comprises two thin film transistor (TFT)s and an electric capacity; One of them thin film transistor (TFT) is a switch transistor T 1, and the sweep signal Vscan that is exported by sweep trace controls, and purpose is the input for the data-signal Vdata on the control data line; Another thin film transistor (TFT) is driving tube T2, and OLED is luminous in control; Cs is a MM CAP, is used for keeping the voltage that driving tube T2 is applied in non-scan period, and foregoing circuit is called as 2T1C pixel cell driving circuit.
AMOLED (Active Matrix Organic Light Emitting Diode; Active matrix organic light-emitting diode) can luminously be to drive by the electric current that drive thin film transistors produces when the state of saturation; Because when importing identical gray scale voltage; The different threshold voltage of said drive thin film transistors can cause producing different drive currents, causes the inconsistency of electric current.And the non-constant of homogeneity of LTPS (low temperature polycrystalline silicon technology) processing procedure upper threshold voltage Vth, Vth also has drift simultaneously, and therefore the brightness uniformity of traditional 2T1C pixel cell driving circuit is very poor always.
Summary of the invention
Fundamental purpose of the present invention is to provide a kind of pixel cell driving circuit and method, pixel cell and display device, to improve the oled panel luminance uniformity.
In order to achieve the above object, the invention provides a kind of pixel cell driving circuit, be used for driving OLED, said pixel cell driving circuit comprises drive thin film transistors, first on-off element, MM CAP and driving control unit;
The grid of said drive thin film transistors is connected with first end of said MM CAP; Second end of said MM CAP is connected with the high level output terminal of driving power, and the source electrode of said drive thin film transistors is connected with the negative electrode of said OLED through said first on-off element;
The source electrode of said drive thin film transistors also is connected with data line through said driving control unit;
The grid of said drive thin film transistors also is connected with the drain electrode of said drive thin film transistors and the low level output terminal of said driving power respectively through said driving control unit;
The drain electrode of said drive thin film transistors is connected with the low level output terminal of said driving power through said driving control unit;
Said driving control unit; Be used for discharging and recharging through controlling said MM CAP; The gate source voltage of the said drive thin film transistors compensation Vth to control that said drive thin film transistors works in the saturation region, wherein, Vth is the threshold voltage of said drive thin film transistors.
During enforcement, said drive thin film transistors is a p type thin film transistor (TFT).
During enforcement, said first on-off element is a p type thin film transistor (TFT), said first on-off element, and grid is connected with first control line, and source electrode is connected with the negative electrode of said OLED, and drain electrode is connected with the source electrode of said drive thin film transistors.
During enforcement, said driving control unit comprises second switch element, the 3rd on-off element and the 4th on-off element;
Be connected with said second switch element between the low level output terminal of the drain electrode of said drive thin film transistors and said driving power;
Be connected with said the 3rd on-off element between the source electrode of said drive thin film transistors and the data line; Be connected with said the 4th on-off element between the grid of said drive thin film transistors and the drain electrode of said drive thin film transistors.
During enforcement, said second switch element, said the 3rd on-off element and said the 4th on-off element are p type TFT;
Said second switch element, grid is connected with second control line, and source electrode is connected with the drain electrode of said thin film transistor (TFT), and drain electrode is connected with the low level output terminal of said driving power;
Said the 3rd on-off element, grid is connected with the sweep trace that is used to export control signal, and source electrode is connected with data line, and drain electrode is connected with the source electrode of said drive thin film transistors;
Said the 4th on-off element, grid is connected with said sweep trace, and source electrode is connected with the grid of said drive thin film transistors, and drain electrode is connected with the drain electrode of said drive thin film transistors.
The present invention also provides a kind of pixel cell driving method, and it is applied to above-mentioned pixel cell driving circuit, and said pixel cell driving method comprises:
The pixel charge step: driving control unit control store electric capacity is recharged;
The pixel discharge step: said driving control unit is controlled said MM CAP through drive thin film transistors discharge, is the threshold voltage vt h of said drive thin film transistors until the gate source voltage of said drive thin film transistors;
The luminous step display of driving OLED: said driving control unit is controlled said drive thin film transistors and is worked in the saturation region; And the voltage difference of controlling said MM CAP two ends is constant; So that it is the gate source voltage of said drive thin film transistors compensates the threshold voltage vt h of said drive thin film transistors, luminous through said drive thin film transistors driving OLED.
During enforcement, said pixel charge step comprises: the source electrode that first on-off element breaks off said drive thin film transistors is connected with the negative electrode of said OLED; The drain electrode of the said drive thin film transistors of said driving control unit conducting is connected with the low level output terminal of driving power; The source electrode of the said drive thin film transistors of conducting is connected with data line; The grid of the said drive thin film transistors of conducting is connected with the drain electrode of said drive thin film transistors, controls said MM CAP and is recharged;
Said pixel discharge step comprises: the source electrode that said first on-off element breaks off said drive thin film transistors is connected with the negative electrode of said OLED; The drain electrode that said driving control unit is broken off said drive thin film transistors is connected with the low level output terminal of said driving power; Controlling said MM CAP and discharge through said drive thin film transistors, is the threshold voltage vt h of said drive thin film transistors until the gate source voltage of said drive thin film transistors;
The luminous step display of said driving OLED comprises: the source electrode of the said drive thin film transistors of the said first on-off element conducting is connected with the negative electrode of said OLED; The drain electrode of the said drive thin film transistors of said driving control unit conducting is connected with the low level output terminal of said driving power; Break off the source electrode of said drive thin film transistors and being connected of said data line; The grid that breaks off said drive thin film transistors is connected with the drain electrode of said drive thin film transistors; Control said drive thin film transistors and work in the saturation region; And the gate source voltage of said drive thin film transistors compensates the threshold voltage vt h of said drive thin film transistors, and is luminous through said drive thin film transistors driving OLED.
The present invention also provides a kind of pixel cell, comprises OLED and above-mentioned pixel cell driving circuit, and this pixel cell driving circuit is connected with the negative electrode of said OLED, and the anode of said OLED is connected with the high level output terminal of driving power.
The present invention also provides a kind of display device, comprises a plurality of above-mentioned pixel cells.
Compared with prior art; Pixel cell driving circuit of the present invention and method, pixel cell and display device; The threshold voltage of the gate source voltage compensation drive thin film transistors through the controlling and driving thin film transistor (TFT) solves the problem of the even brightness decay of oled panel brightness disproportionation.
Description of drawings
Fig. 1 is the circuit diagram of existing 2T1C pixel cell driving circuit;
Fig. 2 is the circuit diagram of the described pixel cell driving circuit of first embodiment of the invention;
Fig. 3 is the circuit diagram of the described pixel cell driving circuit of second embodiment of the invention;
Fig. 4 is the circuit diagram of the described pixel cell driving circuit of third embodiment of the invention;
Fig. 4 A is the circuit diagram that the described pixel cell driving circuit of third embodiment of the invention is in the equivalent electrical circuit of very first time during section;
Fig. 4 B is the circuit diagram of the equivalent electrical circuit of the described pixel cell driving circuit of third embodiment of the invention when being in for second time period;
Fig. 4 C is the circuit diagram of the equivalent electrical circuit of the described pixel cell driving circuit of third embodiment of the invention when being in for the 3rd time period;
Fig. 5 is the sequential chart of each signal in the described pixel cell driving circuit of third embodiment of the invention.
Embodiment
The invention provides a kind of pixel cell driving circuit and method, pixel cell and display device; Utilize diode (Diode Connection) and through the control store capacitor discharge so that the gate source voltage of drive thin film transistors compensates the threshold voltage vt h of said drive thin film transistors, thereby solve the problem of the even brightness decay of oled panel brightness disproportionation.
As shown in Figure 2, the described pixel cell driving circuit of first embodiment of the invention is used for driving OLED, and said pixel cell driving circuit comprises drive thin film transistors DTFT, first on-off element 21, MM CAP Cs and driving control unit 22;
The grid of said drive thin film transistors DTFT is connected with first end of said MM CAP Cs; Second end of said MM CAP Cs and the output voltage of driving power are that the high level output terminal of VDD is connected, and the source electrode of said drive thin film transistors DTFT is connected with the negative electrode of said OLED through said first on-off element 21;
The source electrode DTFT of said drive thin film transistors also is connected with data line Data through said driving control unit 22;
The grid of said drive thin film transistors DTFT is that the low level output terminal of VSS is connected with the output voltage of the drain electrode of said drive thin film transistors DTFT and said driving power respectively through said driving control unit 22 also;
The drain electrode of said drive thin film transistors DTFT is connected with the low level output terminal of said driving power through said driving control unit 22;
Said driving control unit 22; Be used for discharging and recharging through controlling said MM CAP Cs; The gate source voltage of the said drive thin film transistors DTFT compensation Vth to control that said drive thin film transistors DTFT works in the saturation region, wherein, Vth is the threshold voltage of said drive thin film transistors DTFT;
Said driving control unit 22 also is connected with control line CR with the sweep trace SCAN that is used for input control signal respectively;
The anode of said OLED is connected with the high level output terminal of said driving power.
According to a kind of embodiment, in this embodiment, said drive thin film transistors DTFT is a p type thin film transistor (TFT).
During enforcement; In this embodiment; Said first on-off element 21 breaks off the source electrode of said drive thin film transistors DTFT and being connected of said OLED in the very first time section and second time period, in the source electrode of the said drive thin film transistors DTFT of the 3rd time period conducting and being connected of said OLED;
Said driving control unit 22 is controlled said MM CAP Cs in said very first time section and is recharged;
Said driving control unit 22 is controlled said MM CAP Cs in said second time period and is discharged through said drive thin film transistors DTFT, is the threshold voltage vt h of said drive thin film transistors DTFT until the gate source voltage of said drive thin film transistors DTFT;
Said driving control unit 22 is controlled said drive thin film transistors DTFT in said the 3rd time period and is worked in the saturation region; And the voltage difference of controlling said MM CAP Cs two ends is constant, so that the gate source voltage of said drive thin film transistors DTFT compensates the threshold voltage vt h of said drive thin film transistors DTFT.
During enforcement, said driving control unit comprises second switch element, the 3rd on-off element and the 4th on-off element;
Be connected with said second switch element between the low level output terminal of the drain electrode of said drive thin film transistors and said driving power;
Be connected with said the 3rd on-off element between the source electrode of said drive thin film transistors and the data line;
Be connected with said the 4th on-off element between the grid of said drive thin film transistors and the drain electrode of said drive thin film transistors;
In very first time section; The drain electrode of the said drive thin film transistors of said second switch element conductive is connected with the low level output terminal of said driving power; The source electrode of the said drive thin film transistors of said the 3rd on-off element conducting is connected with said data line, and the grid of the said drive thin film transistors of said the 4th on-off element conducting is connected with the drain electrode of said drive thin film transistors;
In second time period, the drain electrode that said second switch element breaks off said drive thin film transistors is connected with the low level output terminal of said driving power;
In the 3rd time period; The drain electrode of the said drive thin film transistors of said second switch element conductive is connected with the low level output terminal of said driving power; Said the 3rd on-off element breaks off the source electrode of said drive thin film transistors and being connected of said data line, and the grid that said the 4th on-off element breaks off said drive thin film transistors is connected with the drain electrode of said drive thin film transistors.
As shown in Figure 3, the circuit diagram of the described pixel cell driving circuit of second embodiment of the invention.The described pixel cell driving circuit of second embodiment of the invention is based on the described pixel cell driving circuit of first embodiment of the invention.
In the described pixel cell driving circuit of second embodiment of the invention, said first on-off element 21 is that label is first switching TFT of T1, and T1 is a p type thin film transistor (TFT);
The grid of T1 is connected with the first control line CR1, and the source electrode of T1 is connected with the negative electrode of said OLED, and the drain electrode of T1 is connected with the source electrode of said drive thin film transistors DTFT.
As shown in Figure 4; The circuit diagram of the 3rd embodiment of pixel cell driving circuit of the present invention; The described pixel cell driving circuit of this embodiment adopts the 5T1C circuit, through compensation Vth, so that the threshold voltage vt h of the electric current that flows through said OLED and said drive TFT has nothing to do; Reach the electric current unanimity, improve homogeneity and reliability.
In this embodiment, said first on-off element is that label is first switching TFT of T1, and said second switch element is that label is the second switch TFT of T2; Said the 3rd on-off element is that label is the 3rd switching TFT of T3; Said the 4th on-off element is that label is the 4th switching TFT of T4, and said drive thin film transistors is that label is the drive TFT of DTFT, and the low level output terminal of said driving power is an earth terminal; Wherein
T1, T2, T3, T4, DTFT are p type TFT, and the threshold voltage vt h of p type TFT is less than 0;
The drain electrode of T4 is connected with the source electrode of the source electrode of DTFT and T2, and the source electrode of T4 is connected with first end of MM CAP Cs and the grid of DTFT respectively;
The grounded drain of T2;
The drain electrode of T3 is connected with said data line Data, and the source electrode of T3 is connected with the drain electrode of the source electrode of said drive TFT and DTFT;
The source electrode of T1 is connected with the negative electrode of said OLED;
The grid of T4 is connected with the sweep trace SCAN that is used for transmission of control signals with the grid of said T3;
The grid of T1 is connected with the first control line CR1, and the grid of T2 is connected with the second control line CR2;
Shown in Fig. 4 A, during the described pixel cell drive circuit works of third embodiment of the invention, in very first time section; Be pre-charging stage, said sweep trace SCAN and said control line CR1 output electronegative potential, said control line CR2 output noble potential; Open with control T4, T2, T3, and control T1 closes (in Fig. 4 A, owing to T4, T2, T3 open; Then not shown T2, T3, T4, and substitute with lead; And, because T1 closes, thus the source electrode of DTFT not with the negative electrode conducting of OLED; Then do not show T1 and OLED among Fig. 4 A), the voltage Vdata input on the said data line Data, said MM CAP Cs is recharged; A point (being the grid of DTFT) voltage VA is 0, and B point (being the source electrode of DTFT) voltage VB is Vdata, the gate-source voltage Vgs=VA-VB=-Vdata of DTFT; It is less than the threshold voltage vt h of DTFT, and this moment, DTFT was that a diode gets into state of saturation in fact;
Shown in Fig. 4 B, during the described pixel cell drive circuit works of third embodiment of the invention, in second time period; Said control line CR2 output noble potential, T2 closes with control, the disconnection of A point and ground wire be connected that (difference of Fig. 4 B and Fig. 4 A is; The A point has broken off and being connected of ground wire); Said MM CAP Cs begins discharge through T4, DTFT and T3, reaches the threshold voltage vt h of DTFT up to the gate source voltage Vgs of DTFT, and the B point voltage maintains Vdata; Therefore the grid voltage (being the A point voltage) of DTFT is Vth+VB=Vth+Vdata, and this moment, said drive thin film transistors got into the subthreshold conducting state; The voltage of said sweep trace SCAN output becomes noble potential in advance and does buffering, so that the A point voltage is stable;
Shown in Fig. 4 C, during the described pixel cell drive circuit works of third embodiment of the invention, in the 3rd time period; Said sweep trace SCAN output noble potential cuts out with control T4, T3, and said control line CR1 and said control line CR2 all export electronegative potential; Open with control T2, T1 that (difference of Fig. 4 C and Fig. 4 B is; Make A point break off and being connected of the drain electrode of DTFT owing to T4 breaks off, because the T3 disconnection makes the source electrode disconnection of DTFT and being connected of data line Data, the source electrode that has then increased DTFT owing to the T1 conducting is connected with the negative electrode of OLED; And because the T2 conducting has increased the drain electrode of DTFT and being connected of ground wire); DTFT works in the saturation region, flows through said OLED with drive current, and said OLED begins luminous; This moment VB=VDD-Vth_oled, the computing formula of electric current I that flows through said OLED this moment is for by shown in the formula (1):
I＝K×(Vgs-Vth)
2＝K×(VA-VB-Vth)
2
＝K×{Vth+Vdata-(VDD-Vth_oled)-Vth}
2
=K * (Vdata+Vth_oled-VDD)
2Formula (1)
Wherein, K is the current coefficient of DTFT;
μ, C
OX, X, W, L be respectively the field-effect mobility of DTFT, gate insulation layer unit-area capacitance, channel width, length;
The 3rd time period was the OLED glow phase, and said OLED will continue luminously to write to the next frame data.
So just make that the electric current that flows through said OLED does not receive the influence of the threshold voltage vt h of said drive TFT, flow through the homogeneity of the electric current of said OLED with improvement, reach oled panel brightness evenly.
Fig. 5 is the sweep signal VSCAN of the sweep trace SCAN output in the described pixel cell driving circuit of the 3rd embodiment, the data-signal Vdata of data line Data output, the control signal VCR1 of first control line CR1 output and the sequential chart of the control signal VCR2 that the second control line CR2 exports; In Fig. 4, what C, D, E indicated respectively is very first time section, second time period, the 3rd time period.
The present invention also provides a kind of pixel cell driving method, and it is applied to above-mentioned pixel cell driving circuit, and said pixel cell driving method comprises:
The pixel charge step: driving control unit control store electric capacity is recharged;
The pixel discharge step: said driving control unit is controlled said MM CAP through drive thin film transistors discharge, is the threshold voltage vt h of said drive thin film transistors until the gate source voltage of said drive thin film transistors;
The luminous step display of driving OLED: said driving control unit is controlled said drive thin film transistors and is worked in the saturation region; And the voltage difference of controlling said MM CAP two ends is constant; So that it is the gate source voltage of said drive thin film transistors compensates the threshold voltage vt h of said drive thin film transistors, luminous through said drive thin film transistors driving OLED.
During enforcement, said pixel charge step comprises: the source electrode that first on-off element breaks off said drive thin film transistors is connected with the negative electrode of said OLED; The drain electrode of the said drive thin film transistors of said driving control unit conducting is connected with the low level output terminal of driving power; The source electrode of the said drive thin film transistors of conducting is connected with data line; The grid of the said drive thin film transistors of conducting is connected with the drain electrode of said drive thin film transistors, controls said MM CAP and is recharged;
Said pixel discharge step comprises: the source electrode that said first on-off element breaks off said drive thin film transistors is connected with the negative electrode of said OLED; The drain electrode that said driving control unit is broken off said drive thin film transistors is connected with the low level output terminal of said driving power; Controlling said MM CAP and discharge through said drive thin film transistors, is the threshold voltage vt h of said drive thin film transistors until the gate source voltage of said drive thin film transistors;
The luminous step display of said driving OLED comprises: the source electrode of the said drive thin film transistors of the said first on-off element conducting is connected with the negative electrode of said OLED; The drain electrode of the said drive thin film transistors of said driving control unit conducting is connected with the low level output terminal of said driving power; Break off the source electrode of said drive thin film transistors and being connected of said data line; The grid that breaks off said drive thin film transistors is connected with the drain electrode of said drive thin film transistors; Control said drive thin film transistors and work in the saturation region; And the voltage difference of controlling said MM CAP two ends is constant and the voltage of second end of said MM CAP stable, and is so that the gate source voltage of said drive thin film transistors compensates the threshold voltage vt h of said drive thin film transistors, luminous through said drive thin film transistors driving OLED.
The invention also discloses a kind of pixel cell, comprise OLED and above-mentioned pixel cell driving circuit, this pixel cell driving circuit is connected with the negative electrode of said OLED, and the anode of said OLED is connected with the high level output terminal of driving power.Pixel cell of the present invention adopts OLED to go up luminous mode, compares that illumination mode has higher aperture opening ratio under the OLED.
The present invention also provides a kind of display device, comprises a plurality of above-mentioned pixel cells.
More than explanation is just illustrative for the purpose of the present invention; And nonrestrictive, those of ordinary skills understand, under the situation of spirit that does not break away from accompanying claims and limited and scope; Can make many modifications, variation or equivalence, but all will fall in protection scope of the present invention.
Claims (9)
1. a pixel cell driving circuit is used for driving OLED, it is characterized in that, said pixel cell driving circuit comprises drive thin film transistors, first on-off element, MM CAP and driving control unit;
The grid of said drive thin film transistors is connected with first end of said MM CAP; Second end of said MM CAP is connected with the high level output terminal of driving power, and the source electrode of said drive thin film transistors is connected with the negative electrode of said OLED through said first on-off element;
The source electrode of said drive thin film transistors also is connected with data line through said driving control unit;
The grid of said drive thin film transistors also is connected with the drain electrode of said drive thin film transistors and the low level output terminal of said driving power respectively through said driving control unit;
The drain electrode of said drive thin film transistors is connected with the low level output terminal of said driving power through said driving control unit;
Said driving control unit; Be used for discharging and recharging through controlling said MM CAP; The gate source voltage of the said drive thin film transistors compensation Vth to control that said drive thin film transistors works in the saturation region, wherein, Vth is the threshold voltage of said drive thin film transistors.
2. pixel cell driving circuit as claimed in claim 1 is characterized in that, said drive thin film transistors is a p type thin film transistor (TFT).
3. pixel cell driving circuit as claimed in claim 2 is characterized in that, said first on-off element is a p type thin film transistor (TFT); Said first on-off element; Grid is connected with first control line, and source electrode is connected with the negative electrode of said OLED, and drain electrode is connected with the source electrode of said drive thin film transistors.
4. pixel cell driving circuit as claimed in claim 3 is characterized in that, said driving control unit comprises second switch element, the 3rd on-off element and the 4th on-off element;
Be connected with said second switch element between the low level output terminal of the drain electrode of said drive thin film transistors and said driving power;
Be connected with said the 3rd on-off element between the source electrode of said drive thin film transistors and the data line; Be connected with said the 4th on-off element between the grid of said drive thin film transistors and the drain electrode of said drive thin film transistors.
5. pixel cell driving circuit as claimed in claim 4 is characterized in that, said second switch element, said the 3rd on-off element and said the 4th on-off element are p type TFT;
Said second switch element, grid is connected with second control line, and source electrode is connected with the drain electrode of said thin film transistor (TFT), and drain electrode is connected with the low level output terminal of said driving power;
Said the 3rd on-off element, grid is connected with the sweep trace that is used to export control signal, and source electrode is connected with data line, and drain electrode is connected with the source electrode of said drive thin film transistors;
Said the 4th on-off element, grid is connected with said sweep trace, and source electrode is connected with the grid of said drive thin film transistors, and drain electrode is connected with the drain electrode of said drive thin film transistors.
6. pixel cell driving method, it is applied to pixel cell driving circuit as claimed in claim 1, it is characterized in that, and said pixel cell driving method comprises:
The pixel charge step: driving control unit control store electric capacity is recharged;
The pixel discharge step: said driving control unit is controlled said MM CAP through drive thin film transistors discharge, is the threshold voltage vt h of said drive thin film transistors until the gate source voltage of said drive thin film transistors;
The luminous step display of driving OLED: said driving control unit is controlled said drive thin film transistors and is worked in the saturation region; And the voltage difference of controlling said MM CAP two ends is constant; So that it is the gate source voltage of said drive thin film transistors compensates the threshold voltage vt h of said drive thin film transistors, luminous through said drive thin film transistors driving OLED.
7. pixel cell driving method as claimed in claim 6 is characterized in that,
Said pixel charge step comprises: the source electrode that first on-off element breaks off said drive thin film transistors is connected with the negative electrode of said OLED; The drain electrode of the said drive thin film transistors of said driving control unit conducting is connected with the low level output terminal of driving power; The source electrode of the said drive thin film transistors of conducting is connected with data line; The grid of the said drive thin film transistors of conducting is connected with the drain electrode of said drive thin film transistors, controls said MM CAP and is recharged;
Said pixel discharge step comprises: the source electrode that said first on-off element breaks off said drive thin film transistors is connected with the negative electrode of said OLED; The drain electrode that said driving control unit is broken off said drive thin film transistors is connected with the low level output terminal of said driving power; Controlling said MM CAP and discharge through said drive thin film transistors, is the threshold voltage vt h of said drive thin film transistors until the gate source voltage of said drive thin film transistors;
The luminous step display of said driving OLED comprises: the source electrode of the said drive thin film transistors of the said first on-off element conducting is connected with the negative electrode of said OLED; The drain electrode of the said drive thin film transistors of said driving control unit conducting is connected with the low level output terminal of said driving power; Break off the source electrode of said drive thin film transistors and being connected of said data line; The grid that breaks off said drive thin film transistors is connected with the drain electrode of said drive thin film transistors; Control said drive thin film transistors and work in the saturation region; And the gate source voltage of said drive thin film transistors compensates the threshold voltage vt h of said drive thin film transistors, and is luminous through said drive thin film transistors driving OLED.
8. pixel cell; It is characterized in that; Comprise OLED and like the described pixel cell driving circuit of arbitrary claim in the claim 1 to 5, this pixel cell driving circuit is connected with the negative electrode of said OLED, the anode of said OLED is connected with the high level output terminal of driving power.
9. a display device is characterized in that, comprises a plurality of pixel cells as claimed in claim 8.
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| CN103000134A (en) * | 2012-12-21 | 2013-03-27 | 北京京东方光电科技有限公司 | Pixel circuit, driving method of pixel circuit and display device |
| CN104200778A (en) * | 2014-09-25 | 2014-12-10 | 上海天马有机发光显示技术有限公司 | Pixel circuit as well as driving method, display panel and display device thereof |
| CN104318902A (en) * | 2014-11-19 | 2015-01-28 | 上海天马有机发光显示技术有限公司 | Pixel circuit and drive method of organic light-emitting display and organic light-emitting display |
| CN104680976A (en) * | 2015-02-09 | 2015-06-03 | 京东方科技集团股份有限公司 | Pixel compensation circuit, display device and driving method |
| WO2017024454A1 (en) * | 2015-08-07 | 2017-02-16 | 深圳市柔宇科技有限公司 | Pixel circuit and drive method therefor, and display panel |
| TWI571853B (en) * | 2013-11-07 | 2017-02-21 | 宸鴻光電科技股份有限公司 | Pixel units and driving circuits |
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Application publication date: 20121003 |