CN1601594A - Active array organic LED pixel drive circuit and its drive method - Google Patents
Active array organic LED pixel drive circuit and its drive method Download PDFInfo
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Abstract
In compensation state, the first capacitor obtains threshold voltage of transistor. In state of writing data, second capacitor obtains driving voltage. In emission state, bias voltage equal to voltage of cascaded first capacitor and second capacitor is added to the transistor, and the transistor is in use for controlling current passing through the organic light emitting diode.
Description
Technical field
The present invention is relevant for a kind of active array organic light-emitting diode pixel driving circuit, and particularly relevant for a kind of active array organic light-emitting diode pixel driving circuit and driving method thereof with threshold voltage compensation.
Background technology
With the manufacturing process complexity, itself can not be luminous and need LCD (the LiquidCrystal Display of background light source, LCD) compare, Organic Light Emitting Diode (Organic Light EmittingDiode, but OLED) display has that manufacturing process is simple, the visual angle is wide, cost is low, thin thickness, operating temperature range extensively reach self advantage such as luminous.Therefore, Organic Light Emitting Diode (OLED) promptly can be as the pixel in the active array electroluminescence formula display (Active Matrix Electron Luminescent Display), and the trend that replaces LCD display has gradually been arranged.
Please refer to Fig. 1, represent the pixel-driving circuit of conventional Organic Light Emitting Diode.Each pixel-driving circuit of conventional Organic Light Emitting Diode is combined by capacitors of two transistors (2T1C).Wherein, the transistor M1 control utmost point is couple to sweep circuit (Scan Line) 10, and two ends then are couple to the data circuit (Data Line) 20 and the transistor M2 control utmost point respectively in addition.Transistor M2 source electrode is couple to power supply (Vdd), and it is extreme that drain electrode is couple to Organic Light Emitting Diode (OLED) P.Organic Light Emitting Diode (OLED) N extremely then is connected to ground voltage (GND).Capacitor Cs is coupled between the transistor M2 source electrode and the control utmost point.
When sweep circuit 10 work, transistor M1 conducting (On), this moment, driving voltage can and be stored among the capacitor Cs apace by data circuit 20 inputs.In driving voltage input capacitor Cs, this driving voltage can produce biasing (Bias) to transistor M2, so fixed current Id can pass through Organic Light Emitting Diode, makes Organic Light Emitting Diode luminous.
From the above, the organic light-emitting diode pixel driving circuit of Fig. 1 makes with driving voltage transistor M2 is produced bias voltage, and makes Organic Light Emitting Diode (OLED) luminous.Because for peripheral circuit is integrated in the display, so the transistor in the pixel-driving circuit of most Organic Light Emitting Diode (OLED) display all is to utilize low temperature polycrystalline silicon (Low Temperature Poly-Silicon, LTPS) the made thin film transistor (TFT) of manufacturing process (Thin Film Transistor, TFT).Yet this thin film transistor (TFT) is owing to the problem of manufacturing process, and threshold voltage of each thin film transistor (TFT) (ThresholdVoltage) and mobility (Mobility) have change to a certain degree.Though and the identical change owing to threshold voltage of the driving voltage that causes input capacitor Cs produces the electric current (Id) of different sizes.Therefore, the electric current difference of the Organic Light Emitting Diode of flowing through (OLED), luminous intensity also can be different.
Summary of the invention
Purpose of the present invention provides a kind of active array organic light-emitting diode pixel driving circuit and driving method thereof with threshold voltage compensation, and the electric current of the feasible Organic Light Emitting Diode of flowing through is accurately controlled, and is not subjected to the influence of transistor threshold voltage.
The present invention proposes a kind of active array organic light-emitting diode pixel driving circuit with threshold voltage compensation, and it imports driving voltage by data circuit, and this driving circuit comprises: the Organic Light Emitting Diode and the transistor of mutual serial connection; First capacitor comprises first end and second end, and first end is couple to the transistorized control utmost point; And second capacitor, comprise the 3rd end and the 4th end, and the 3rd end being couple to second end, the 4th end is couple to a ground voltage; Wherein, when first state, but the threshold voltage of the first capacitor storage transistor, when second state, but the second capacitor storage drive voltage, when the third state, the voltage bias after first capacitor and second capacitors in series at the transistorized control utmost point, and is utilized transistor to control to flow through the electric current of Organic Light Emitting Diode.
The present invention proposes a kind of driving method with active array organic light-emitting diode pixel driving circuit of threshold voltage compensation again, comprises the following steps: when first state record threshold voltage; When second state, the record driving voltage; When the third state, threshold voltage after the addition and driving voltage are biased in the transistorized control utmost point, with the electric current of control transmission to Organic Light Emitting Diode.
In order further to understand feature of the present invention and technology contents, see also following about detailed description of the present invention and accompanying drawing, yet accompanying drawing only provide with reference to and the explanation usefulness, be not to be used for the present invention is limited.
Description of drawings
Fig. 1 represents the pixel-driving circuit of conventional Organic Light Emitting Diode;
Fig. 2 represents that the present invention has first embodiment of the active array organic light-emitting diode pixel driving circuit of threshold voltage compensation;
Fig. 3 represents the signal work synoptic diagram of first embodiment of the invention;
The work synoptic diagram of Fig. 4 (a) and Fig. 4 (b) expression first embodiment of the invention;
Fig. 5 represents the relation between transistor M4 threshold voltage variation in the first embodiment of the invention and the control pole tension;
Fig. 6 represents the relation between the transistor M4 threshold voltage variation and electric current in the first embodiment of the invention; And
Fig. 7 represents that the present invention has second embodiment of the active array organic light-emitting diode pixel driving circuit of threshold voltage compensation.
The figure number explanation
10 sweep circuits
20,150,250 data circuit
130 first sweep circuits
135 second sweep circuits
140 the 3rd sweep circuits
Embodiment
In order to improve the problem of threshold voltage change in the conventional active array organic light-emitting diode pixel driving circuit, the present invention proposes a kind of active array organic light-emitting diode pixel driving circuit with threshold voltage compensation.
Please refer to Fig. 2, its expression the present invention has first embodiment of the active array organic light-emitting diode pixel driving circuit of threshold voltage compensation.Each pixel-driving circuit of this organic light emitting diode display is combined by two capacitors of four transistors (4T2C).Wherein, the transistor M1 control utmost point is couple to first sweep circuit (Scan 1) 130, and two ends then are couple to data circuit (Data Line) 150 and node " a " respectively in addition.The transistor M2 control utmost point is couple to second sweep circuit (Scan 2) 135, and two ends then are couple to the transistor M4 drain electrode and the transistor M4 control utmost point respectively in addition.Transistor M3 source electrode is couple to transistor M4 drain electrode, and the control utmost point is couple to the 3rd sweep circuit (Scan 3) 140, and it is extreme that drain electrode is couple to Organic Light Emitting Diode (OLED) P.Transistor M4 source terminal is couple to power supply (Vdd).Organic Light Emitting Diode (OLED) N extremely is connected to ground voltage (GND).The first capacitor C1 is coupled between the transistor M4 control utmost point and the node " a ".The second capacitor C2 is coupled between node " a " and the ground voltage (GND).
This circuit structure can be divided into one of four states, is controlled with ground three sweep circuits 140 by first sweep circuit 130, second sweep circuit 135 respectively.Be respectively replacement (Reset) state, compensating coefficient (Compensation), data and write (Data Write-In) state and emission (Emission) state.
Please refer to Fig. 3, the signal operation synoptic diagram of its expression first embodiment of the invention.Please also refer to Fig. 2 and Fig. 3.At first, when Reset Status, first sweep circuit 130, second sweep circuit 135 and 140 work of the 3rd sweep circuit, and have supply voltage (Vdd) on the data circuit.At this moment, transistor M1, transistor M2, transistor M3 conducting, the store charge in the first capacitor C1, the second capacitor C2 and Organic Light Emitting Diode (OLED) stray capacitance is eliminated in the lump.
When compensating coefficient, first sweep circuit 130 and 135 work of second sweep circuit, the 3rd sweep circuit 140 is not worked, and has supply voltage on the data circuit (Vdd).At this moment, transistor M1 and transistor M2 conducting, transistor M3 turn-offs (Off).Because the voltage of node " a " is supply voltage (Vdd), therefore the voltage that had of the first capacitor C1 is the threshold voltage (ThresholdVoltage) of transistor M4, that is V
Th_M4
When the data write state, the work of first sweep circuit 130, second sweep circuit 135 and the 3rd sweep circuit 140 are not worked, and (the V that has driving voltage on the data circuit
Drv).At this moment, transistor M1 conducting, transistor M2 and transistor M3 turn-off.Because the voltage of " a " is driving voltage (V
Drv), so the voltage that the second capacitor C2 is had is driving voltage (V
Drv).At this moment, transistor M4 control pole tension V
G_M4=(V
Drv-| V
Th_M4|).
When emission state, first sweep circuit 130 and second sweep circuit 135 are not worked, 140 work of the 3rd sweep circuit, and have supply voltage (Vdd) on the data circuit.At this moment, transistor M1 and transistor M2 turn-off, transistor M3 conducting.At this moment, the voltage V between the transistor M4 control utmost point and the source electrode
GS_M4=V
G_M4-V
S_M4=(V
Drv-| V
Th_M4|-Vdd).Therefore, the flow through electric current of organic light emission disome (OLED)
Id＝1/2*k*(V
GS_M4+|V
th_M4|)
2
＝1/2*k*(V
drv-|V
th_M4|-Vdd+|V
th_M4|)
2
＝1/2*k*(V
drv-Vdd)
2
Wherein, k is component parameters (Device Parameter)
By following formula as can be known, the electric current I d of the organic light emission disome (OLED) of flowing through has not been the function of threshold voltage, that is this electric current (Id) is irrelevant with the threshold voltage of transistor M4.That is to say that when compensating coefficient, the first capacitor C1 is the threshold voltage of storage transistor M4.Therefore, when emission state, the first capacitor C1 goes up the threshold voltage that stores and can offset with the threshold voltage of transistor M4, and the electric current (Id) of feasible organic light emission disome (OLED) that flow through only is driving voltage (V
Drv) function.So the electric current (Id) of organic light emission disome (OLED) that flow through can not change along with the change of threshold voltage.So, the flow through electric current of the light emitting diode utmost point can obtain accurate control.
Please refer to Fig. 4 (a) and Fig. 4 (b), the work synoptic diagram of its expression first embodiment of the invention.Wherein shown in Fig. 4 (a), transistor M1, transistor M2 and transistor M3 all can be considered switch (Switch) circuit.Shown in Fig. 4 (b), when Reset Status, first switch (SW1), second switch (SW2), with the 3rd switch (SW3) conducting (On), supply voltage (Vdd) is provided on the data circuit.When compensating coefficient, first switch (SW1), second switch (SW2) conducting (On), and the 3rd switch (SW3) turn-offs (Off), and supply voltage (Vdd) is provided on the data circuit.When the data write state, first switch (SW1) conducting (On), is turn-offed (Off) with the 3rd switch (SW3) at second switch (SW2), and driving voltage (Vdrv) is provided on the data circuit.When emission state, first switch (SW1) turn-offs (Off) with second switch (SW2), and the 3rd switch (SW3) conducting (On) provides supply voltage (Vdd) on the data circuit.Wherein, first sweep circuit is used to control first switch (SW1), and second sweep circuit is used to control second switch (SW2), and the 3rd sweep circuit is used to control the 3rd switch (SW3).
Please refer to Fig. 5, the relation in its expression first embodiment of the invention between transistor M4 threshold voltage variation and the control pole tension.In Fig. 5, be provided to transistor M4 with identical driving voltage (Vdrv) with different threshold voltages.Can see that behind Reset Status, compensating coefficient, data write state and emission state the voltage that is couple to the transistor M4 control utmost point is all inequality, that is, after the above-mentioned four kinds of states of process, though the driving voltage (Vdrv) that is stored on the capacitor C2 is identical, but be stored in the bucking voltage difference on the capacitor C1, therefore cause the voltage of the transistor M4 control utmost point all inequality.
Please refer to Fig. 6, the relation in its expression first embodiment of the invention between transistor M4 threshold voltage variation and the electric current.In Fig. 6, be provided to transistor M4 with identical driving voltage (Vdrv) with different threshold voltages.Behind Reset Status, compensating coefficient, data write state and emission state, can see be couple to transistor M4 electric current I d much at one, that is, through after above-mentioned four kinds of states, the threshold voltage of transistor M4 that has been stored in bucking voltage full remuneration on the capacitor C1.At this moment, the flow through electric current of transistor M4 and Organic Light Emitting Diode (OLED) is controlled by the driving voltage on the capacitor C2 (Vdrv).Because driving voltage (Vdrv) is all identical, therefore, the electric current of flow through transistor M4 and Organic Light Emitting Diode (OLED) is all identical.
Because the transistor M4 of the first embodiment of the present invention is realized by the PMOS transistor.In fact, but transistor M4 also nmos pass transistor realize.Please refer to Fig. 7, its expression the present invention has second embodiment of the active array organic light-emitting diode pixel driving circuit of threshold voltage compensation.Wherein, first sweep circuit is used to control first switch (SW1), and second sweep circuit is used to control second switch (SW2), and the 3rd sweep circuit is used to control the 3rd switch (SW3).First switch (SW1), two ends then are couple to data circuit (Data Line) 250 and node " b " respectively.Second switch (SW2) two ends then are couple to the transistor M5 drain electrode and the transistor M5 control utmost point respectively.It is extreme with Organic Light Emitting Diode (OLED) N that the 3rd switch (SW3) two ends are couple to transistor M5 drain electrode respectively.Transistor M5 source terminal is couple to ground voltage (GND).Organic Light Emitting Diode (OLED) P extremely is connected to supply voltage (Vdd).The 3rd capacitor C3 is coupled between the transistor M5 control utmost point and the node " b ".The 4th capacitor C4 is coupled between node " b " and the ground voltage (GND).
And through after Reset Status, compensating coefficient, data write state and the emission state, the electric current of the Organic Light Emitting Diode of flowing through can not be subjected to the influence of transistor M5 threshold voltage.
Learn that by knowing in the above-mentioned explanation advantage of the present invention provides a kind of active array organic light-emitting diode pixel driving circuit and driving method thereof with threshold voltage compensation.Make bias transistor and when producing electric current, transistorized threshold voltage is compensated, and therefore, driving voltage can accurately be controlled the electric current of the Organic Light Emitting Diode of flowing through.Therefore the application's technical scheme except Organic Light Emitting Diode (OLED), still can be widely used in all kinds of the utilization on the Current Control light-emitting component that size of current controls luminous intensity.
In sum; though the present invention with preferred embodiment openly as above; so it is not to be used to limit the present invention; any those skilled in the art; under the situation that does not break away from the spirit and scope of the present invention; can carry out various changes and modification, so protection scope of the present invention is worked as the claim restricted portion that is proposed and is as the criterion.
Claims (10)
1. the active array organic light-emitting diode pixel driving circuit with threshold voltage compensation is imported a driving voltage by a data circuit, and this driving circuit comprises at least:
One transistor has a control utmost point;
One Organic Light Emitting Diode is electrically connected to this transistor;
One first capacitor has one first end and one second end, and wherein this first end is couple to this control utmost point; And
One second capacitor has one the 3rd end and one the 4th end, and wherein the 3rd end is couple to this second end, and the 4th end is couple to a ground voltage;
Wherein, when one first state, this first capacitor can store this transistorized threshold voltage; When one second state, this second capacitor can store this driving voltage; When a third state, the voltage bias after this first capacitor and this second capacitors in series is controlled the utmost point this transistorized being somebody's turn to do, and utilize this transistor to control the electric current of this Organic Light Emitting Diode of flowing through.
2. driving circuit as claimed in claim 1 also comprises one first switch, this driving voltage on this data circuit can be transferred to this second capacitor when this second state.
3. driving circuit as claimed in claim 1, wherein, when this first state, with the voltage that this transistor source coupled, be provided to this second end of this first capacitor simultaneously via this data circuit, be used to make this first capacitor can store this threshold voltage.
4. the driving method with active array organic light-emitting diode pixel driving circuit of threshold voltage compensation comprises the following steps: at least
When one first state, write down a threshold voltage;
When one second state, write down a driving voltage;
When a third state, will be biased in a transistorized control utmost point after this threshold voltage and this driving voltage addition, and utilize this transistor to control the electric current of this Organic Light Emitting Diode of flowing through.
5. driving method as claimed in claim 4, wherein, this threshold voltage is this transistorized threshold voltage.
6. driving method as claimed in claim 4, wherein, this threshold voltage is recorded in one first capacitor.
7. driving method as claimed in claim 6, wherein,
One first end of this first capacitor is couple to this transistorized control utmost point, and a voltage that will this transistorized one source pole coupled, is provided to one second end of this first capacitor simultaneously, is used to make this first capacitor can write down this threshold voltage.
8. driving method as claimed in claim 4, wherein, this driving voltage is recorded in one second capacitor.
9. driving method as claimed in claim 8 also comprises one first switch, this driving voltage on one data circuit can be transferred to this second capacitor when this second state.
10. the active array Current Control light-emitting component pixel-driving circuit with threshold voltage compensation is imported a driving voltage by a data circuit, and this driving circuit comprises at least:
One transistor has a control utmost point;
One Current Control light-emitting component is electrically connected to this transistor;
One first capacitor has one first end and one second end, and wherein this first end is couple to this control utmost point; And
One second capacitor has one the 3rd end and one the 4th end, and wherein the 3rd end is couple to this second end, and the 4th end is couple to a ground voltage;
Wherein, when one first state, this first capacitor can store this transistorized threshold voltage; When one second state, this second capacitor can store this driving voltage; When a third state, with the voltage bias after this first capacitor and this second capacitors in series this transistorized should control utmost point, and utilize this transistor to control to flow through the electric current of this Current Control light-emitting component.
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| CNB031587259A CN100373435C (en) | 2003-09-22 | 2003-09-22 | Active array organic LED pixel drive circuit and its drive method |
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| CNB031587259A CN100373435C (en) | 2003-09-22 | 2003-09-22 | Active array organic LED pixel drive circuit and its drive method |
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| CN100373435C CN100373435C (en) | 2008-03-05 |
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| KR100870004B1 (en) * | 2002-03-08 | 2008-11-21 | 삼성전자주식회사 | Organic electroluminescent display and driving method thereof |
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