CN101859539A - Drive circuit for current drive element and drive method - Google Patents

Drive circuit for current drive element and drive method Download PDF

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Publication number
CN101859539A
CN101859539A CN201010163563A CN201010163563A CN101859539A CN 101859539 A CN101859539 A CN 101859539A CN 201010163563 A CN201010163563 A CN 201010163563A CN 201010163563 A CN201010163563 A CN 201010163563A CN 101859539 A CN101859539 A CN 101859539A
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CN
China
Prior art keywords
switch
electrically coupled
npn
driving circuit
electric capacity
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CN201010163563A
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Chinese (zh)
Inventor
周佳伶
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友达光电股份有限公司
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Priority to CN201010163563A priority Critical patent/CN101859539A/en
Publication of CN101859539A publication Critical patent/CN101859539A/en

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Abstract

The invention relates to a drive circuit for driving a current drive element with a first end and a second end, wherein the first end of the current drive element is electrically coupled to a first preset potential. The drive circuit comprises a switch module, a first capacitor and a second capacitor, wherein the switch module is electrically coupled to a data line, the second end of the current drive element and a second preset potential and used for determining whether to allow the current to pass through the current drive element; the first end and the second end of the first capacitor are respectively electrically coupled to different nodes in the switch module, and the first end of the first capacitor receives the potential on the data line in the specific time period due to the electrical coupling relation; the first end of the second capacitor is electrically connected with the second end of the first capacitor; and the second end of the second capacitor is electrically coupled to the second preset potential. The invention also provides a drive method applicable to the drive circuit.

Description

The driving circuit of current driving element and driving method

Technical field

The invention relates to the display technique field, and particularly relevant for driving circuit that is applicable to the drive current driving element and driving method.

Background technology

Organic Light Emitting Diode (Organic Light Emitting Diode, OLED) pixel of display generally is to come store charge with transistor collocation storage capacitors, with the brightness performance of control Organic Light Emitting Diode; Wherein Organic Light Emitting Diode is a kind of current driving element, and it is according to the different lights that produce in various degree of the size of current of flowing through.See also Fig. 1, it illustrates the synoptic diagram into conventional pixel circuit.Image element circuit 10 comprises driving circuit 12 and Organic Light Emitting Diode 16; Driving circuit 12 shows in order to the brightness of control Organic Light Emitting Diode 16, and is two-transistor one electric capacity (2T1C) framework.Particularly, driving circuit 12 comprises N transistor npn npn M1, P transistor npn npn M2 and capacitor C 1; The drain electrode of N transistor npn npn M1 is electrically coupled to data line DL, and the grid of N transistor npn npn M1 is accepted the control of control signal SCAN to determine whether to make the source electrode that the data current potential is passed to N transistor npn npn M1 that writes on the data line DL; The grid of P transistor npn npn M2 is electrically coupled to the source electrode of N transistor npn npn M1, the source electrode of P transistor npn npn M2 is electrically coupled to power supply potential OVDD, the drain electrode of P transistor npn npn M2 is electrically coupled to the positive pole of Organic Light Emitting Diode 16, and the negative pole of Organic Light Emitting Diode 16 is electrically coupled to another power supply potential OVSS; The two ends cross-over connection of capacitor C 1 is between the grid and source electrode of P transistor npn npn M2.

Yet, each image element circuit for organic light emitting diode display, because the influence of processing procedure, the transistorized critical voltage of each image element circuit is not identical, give the identical data current potential that writes even make, the electric current of Organic Light Emitting Diode 16 of flowing through in the different pixels circuit is still variant, causes display brightness inhomogeneous.

Summary of the invention

The purpose of this invention is to provide a kind of driving circuit that is suitable for the drive current driving element, to improve the brightness irregularities problem that is caused because of transistorized critical voltage difference.

A further object of the present invention provides a kind of driving method that is suitable for the drive current driving element, to improve the brightness irregularities problem that is caused because of transistorized critical voltage difference.

A kind of driving circuit that the embodiment of the invention proposes is suitable for the drive current driving element.Wherein, current driving element has first end and second end, and first end of current driving element is electrically coupled to first preset potential.Driving circuit has a plurality of switches, and each switch has control end, first path terminal and alternate path end.Particularly, driving circuit comprises first switch, second switch, the 3rd switch, first electric capacity and second electric capacity; The control end of first switch is electrically coupled to first control signal, and determines whether the current potential on the data line to be passed to from first path terminal of first switch alternate path end of first switch according to first control signal; The control end of second switch is electrically coupled to the alternate path end of first switch, and first path terminal of second switch is electrically coupled to second end of current driving element; The control end of the 3rd switch is electrically coupled to second control signal, and first path terminal of the 3rd switch is electrically coupled to the alternate path end of second switch, and the alternate path end of the 3rd switch is electrically coupled to second preset potential; The two ends of first electric capacity are electrically coupled to the control end of second switch and the alternate path end of second switch respectively; The two ends of second electric capacity are electrically coupled to first path terminal of the 3rd switch and the alternate path end of the 3rd switch respectively.

In one embodiment of this invention, the capacitance of the second above-mentioned electric capacity is greater than the capacitance of first electric capacity.

In one embodiment of this invention, above-mentioned first switch, second switch and the 3rd switch are all the N transistor npn npn.

In one embodiment of this invention, first above-mentioned switch and the 3rd switch are the N transistor npn npn, and second switch is the P transistor npn npn.

In one embodiment of this invention, above-mentioned first switch, second switch and the 3rd switch are all the P transistor npn npn.

The driving method of a kind of current driving element that the embodiment of the invention proposes is applicable to above-mentioned driving circuit.Driving method in the present embodiment comprises step: (1) at very first time point, and first switch, second switch and all conductings of the 3rd switch make precharge potential on the data line begin to be passed to first end of first electric capacity; (2) at second time point, first switch and second switch conducting and the 3rd switch ends begin to make second preset potential to stop to be fed to driving circuit inside; (3) at the 3rd time point, first switch conduction and the 3rd switch ends begins to adjust current potential on the data line for after writing the data current potential, and second switch begins conducting; And after the 4th time point, first switch ends and second switch and the 3rd switch conduction, make current potential on the data line stop to be passed to first electric capacity first end, make second preset potential begin to be fed to driving circuit inside, and make the current potential on the data line get back to precharge potential.Wherein, second time point is later than very first time point, and the 3rd time point is later than second time point, and the 4th time point is later than the 3rd time point.

The driving circuit that another embodiment of the present invention proposes is suitable for the drive current driving element.Wherein, current driving element has first end and second end, and first end of current driving element is electrically coupled to first preset potential; Driving circuit comprises switch module, first electric capacity and second electric capacity.Whether switch module is electrically coupled to second end and second preset potential of data line, current driving element, make electric current flow through current driving element in order to decision; First electric capacity has first end and second end, and first end of first electric capacity and second end are electrically coupled to the different nodes in the switch module respectively, and first end of first electric capacity because of the electric property coupling relation at the current potential that receives between given period on the data line; Second electric capacity has first end and second end, and first end of second electric capacity and second end of first electric capacity be electric property coupling mutually, and second end of second electric capacity is electrically coupled to second preset potential.

In one embodiment of this invention, the capacitance of the second above-mentioned electric capacity is greater than the capacitance of first electric capacity.

In one embodiment of this invention, above-mentioned switch module has a plurality of switches, and each switch has control end, first path terminal and alternate path end respectively.Particularly, switch module comprises first switch, second switch and the 3rd switch; The control end of first switch is electrically coupled to first control signal, and determines whether the current potential on the data line to be passed to from first path terminal of first switch alternate path end of first switch according to first control signal; The control end of second switch is electrically coupled to the alternate path end of first switch, and first path terminal of second switch is electrically coupled to second end of current driving element; The control end of the 3rd switch is electrically coupled to second control signal, and first path terminal of the 3rd switch is electrically coupled to the alternate path end of second switch, and the alternate path end of the 3rd switch is electrically coupled to second preset potential.

In one embodiment of this invention, first end of the first above-mentioned electric capacity and second end are electrically coupled to the control end of second switch and the alternate path end of second switch respectively, and first end of second electric capacity and second end then are electrically coupled to the alternate path end of second switch and the alternate path end of the 3rd switch respectively.

The embodiment of the invention designs by the structural arrangements to driving circuit, make driving circuit comprise three switches for example transistor and two electric capacity, for example the size of current of Organic Light Emitting Diode is irrelevant in glow phase and transistorized critical voltage size for current driving element so that flow through, and has got rid of the influence of transistor processing procedure factor to the electric current of the Organic Light Emitting Diode of flowing through.

For above and other objects of the present invention, feature and advantage can be become apparent, preferred embodiment cited below particularly, and cooperate appended graphicly, be described in detail below.

Description of drawings

Fig. 1 illustrates the synoptic diagram of conventional pixel circuit.

Fig. 2 illustrates a kind of driving circuit that is relevant to the embodiment of the invention and the electrical connection of Organic Light Emitting Diode.

Fig. 3 illustrates the sequential chart of a plurality of signals that are relevant to driving circuit shown in Figure 2.

Fig. 4 (a) illustrates and is relevant to the effect simulation figure that driving circuit shown in Figure 1 drives Organic Light Emitting Diode.

Fig. 4 (b) illustrates relevant driving circuit shown in Figure 2 and drives the effect simulation figure of Organic Light Emitting Diode during greater than the capacitance of capacitor C 1 in the capacitance of capacitor C 2.

Fig. 4 (c) illustrates relevant driving circuit shown in Figure 2 drives Organic Light Emitting Diode when the capacitance of capacitor C 2 equals the capacitance of capacitor C 1 effect simulation figure.

Fig. 4 (d) illustrates the effect simulation figure that drives Organic Light Emitting Diode when relevant driving circuit shown in Figure 2 is not provided with capacitor C 2.

Fig. 5 illustrates another driving circuit that is relevant to the embodiment of the invention and the electrical connection of Organic Light Emitting Diode.

Fig. 6 illustrates another driving circuit that is relevant to the embodiment of the invention and the electrical connection of Organic Light Emitting Diode.

Fig. 7 illustrates the sequential chart of a plurality of signals that are relevant to driving circuit shown in Figure 6.

[main element label declaration]

10: image element circuit 12,22,32,42: driving circuit

16,26,36,46: Organic Light Emitting Diode M1, M2, M3: transistor

C1, C2: electric capacity DL: data line

SCAN: control signal OVDD, OVSS: power supply potential

S1, S2: control signal Data: data-signal

Embodiment

Referring to Fig. 2, it shows a kind of driving circuit that is relevant to the embodiment of the invention and the electrical connection of Organic Light Emitting Diode.As shown in Figure 2, driving circuit 22 is suitable for for example Organic Light Emitting Diode 26 of current driving element, and it is three transistors, two electric capacity (3T2C) frameworks.Driving circuit 22 comprises transistor M1, M2 and M3 and capacitor C 1 and C2, and each transistor M1, M2 and M3 are all the N transistor npn npn.In present embodiment, transistor M1, M2 and M3 all use as switch, and grid, drain electrode and the source electrode of each transistor M1, M2 and M3 are respectively the control end of switch, first path terminal and alternate path end; And whether transistor M1, M2 and M3 constitute in order to decision makes electric current flow through the switch module of Organic Light Emitting Diode 26.

Particularly, the grid of N transistor npn npn M1 is electrically coupled to control signal S1, and determine whether the current potential on the data line DL to be passed to from the drain electrode of N transistor npn npn M1 source electrode, the drain electrode of N transistor npn npn M1 and the data line DL electric property coupling of N transistor npn npn M1 according to control signal S1.The grid of N transistor npn npn M2 is electrically coupled to the source electrode of N transistor npn npn M1, and the drain electrode of N transistor npn npn M2 is electrically coupled to the negative pole of Organic Light Emitting Diode 26, and the positive pole of Organic Light Emitting Diode 26 is electrically coupled to power supply potential OVDD.The grid of N transistor npn npn M3 is electrically coupled to control signal S2, and the drain electrode of N transistor npn npn M3 is electrically coupled to the source electrode of N transistor npn npn M2, and the source electrode of N transistor npn npn M3 is electrically coupled to another power supply potential OVSS.First end of capacitor C 1 and second end are electrically coupled to the grid of N transistor npn npn M2 and the source electrode of N transistor npn npn M2 respectively.First end of capacitor C 2 and second end are electrically coupled to the drain electrode of N transistor npn npn M3 and the source electrode of N transistor npn npn M3 respectively.

Describe the concrete start process of driving circuit 22 in detail below in conjunction with Fig. 2 and Fig. 3, Fig. 3 shows the sequential chart of a plurality of signals that are relevant to driving circuit 22.

Particularly, at time point t1, control signal S1 saltus step for high level, control signal S2 for high level and data line DL provide to the data-signal Data of the drain electrode of N transistor npn npn M1 be precharge potential (following will represent it) with Vref, this moment N transistor npn npn M1, M2 and all conductings of M3 makes the precharge potential Vref on the data line DL begin to be passed to first end of capacitor C 1; The grid potential of N transistor npn npn M2 (following will represent it with Vg) is Vref, and the source potential of N transistor npn npn M2 (following will represent it with Vs) is OVSS.

At time point t2, control signal S1 still is precharge potential Vref for high level, control signal S2 saltus step for low level and data line DL provide to the data-signal Data of the drain electrode of N transistor npn npn M1, this moment N transistor npn npn M1 and M2 conducting and N transistor npn npn M3 ends makes power supply potential OVSS be stopped to be directed into the drain electrode of the N transistor npn npn M3 of driving circuit 22 inside; The grid potential Vg of N transistor npn npn M2 is Vref, because of N transistor npn npn M2 conducting, its conducting electric current reaches (Vref-Vth) afterwards to the source potential Vs rising that capacitor C 2 charges to N transistor npn npn M2, transistor M2 ends, electric current is zero and no longer continuation charging, the source potential Vs of N transistor npn npn M2 is fixed to (Vref-Vth), and wherein Vth is the critical voltage of N transistor npn npn M2.

At time point t3, control signal S1 is that high level, control signal S2 are low level, N transistor npn npn M1 conducting and N transistor npn npn M3 ends, and the precharge potential Vref on the data line DL begin to be adjusted into write data current potential (following will represent it) with Vdata after, N transistor npn npn M2 begins conducting; The grid potential Vg of N transistor npn npn M2 is Vdata, and the source potential Vs of N transistor npn npn M2 becomes [(Vref-Vth)+a (Vdata-Vref)], wherein a=C1/ (C1+C2).

After time point t4, light emitting diode 26 is in glow phase, control signal S1 gets back to precharge potential Vref for high level and data line DL provide to the data-signal Data of the drain electrode of N transistor npn npn M1 by writing data current potential Vdata for low level, control signal S2, this moment N transistor npn npn M1 by and N transistor npn npn M2 and M3 conducting make current potential on the data line DL stop to be passed to first end of the capacitor C 1 of driving circuit 22 inside; The grid potential Vg of N transistor npn npn M2 is [Vdata+OVSS-Vref+Vth-a (Vdata-Vref)], and the source potential Vs of N transistor npn npn M2 becomes OVSS, flows through the electric current I ds=k (Vgs-Vth) of light emitting diode 26 this moment 2=k[(1-a) (Vdata-Vref)] 2, this shows, flow through the electric current of light emitting diode 26 and the critical voltage Vth of N transistor npn npn M2 and have nothing to do, got rid of of the influence of transistor processing procedure factor to the electric current of the Organic Light Emitting Diode 26 of flowing through.

Fig. 4 (a) draws and shows that the driving circuit 12 (as shown in Figure 1) that is relevant to prior art drives the effect simulation figure of Organic Light Emitting Diode, Fig. 4 (b) shows relevant driving circuit 22 shown in Figure 2 and drives the effect simulation figure of Organic Light Emitting Diode during greater than the capacitance of capacitor C 1 in the capacitance of capacitor C 2, Fig. 4 (c) shows relevant driving circuit 22 shown in Figure 2 drives Organic Light Emitting Diode when the capacitance of capacitor C 2 equals the capacitance of capacitor C 1 effect simulation figure, Fig. 4 (d) does not show when relevant driving circuit 22 shown in Figure 2 is not provided with capacitor C 2 and drives the effect simulation figure of Organic Light Emitting Diode, and the critical voltage Vth that all shows transistor M2 in Fig. 4 (a) to Fig. 4 (d) is Vt0, bear and drift to (Vt0-0.3) and just drifting to Ids vs.Vdata family curve under (Vt0+0.3) three kinds of situations.Comparison diagram 4 (a) to Fig. 4 (d) as can be known, compared to prior art, adopt the driving circuit 22 of present embodiment can obtain preferable driving effect; And in present embodiment, drive circuitry arrangement has capacitor C 1 and C2, when the capacitance of capacitor C 2 can obtain better driving effect during greater than the capacitance of capacitor C 1, if capacitor C 2 is not set capacitor C 1 only is not set, the electric current I ds of Organic Light Emitting Diode of flowing through is little with the variation that writes data current potential Vdata, and then it is relatively poor to cause driving effect.

Need to prove that at this driving circuit that embodiment of the invention provides is not limited to circuit structure configuration as shown in Figure 2, it also can adopt other change design, circuit structure configuration for example shown in Figure 5 or circuit structure configuration shown in Figure 6, and details are as follows.

Particularly, Fig. 5 shows another driving circuit that is relevant to the embodiment of the invention and the electrical connection of Organic Light Emitting Diode.As shown in Figure 5, driving circuit 32 is suitable for for example Organic Light Emitting Diode 36 of current driving element, and it is three transistors, two electric capacity (3T2C) frameworks.Driving circuit 32 comprises transistor M1, M2 and M3 and capacitor C 1 and C2, and transistor M1 and M3 are all the N transistor npn npn, and transistor M2 is the P transistor npn npn.In present embodiment, transistor M1, M2 and M3 all use as switch, and grid, drain electrode and the source electrode of each transistor M1, M2 and M3 are respectively the control end of switch, first path terminal and alternate path end; And whether transistor M1, M2 and M3 constitute in order to decision makes electric current flow through the switch module of Organic Light Emitting Diode 36.

Hold above-mentioned, the grid of N transistor npn npn M1 is electrically coupled to control signal S1, and determine whether the current potential on the data line DL to be passed to from the drain electrode of N transistor npn npn M1 source electrode, the drain electrode of N transistor npn npn M1 and the data line DL electric property coupling of N transistor npn npn M1 according to control signal S1.The grid of P transistor npn npn M2 is electrically coupled to the source electrode of N transistor npn npn M1, and the drain electrode of P transistor npn npn M2 is electrically coupled to the positive pole of Organic Light Emitting Diode 36, and the negative pole of Organic Light Emitting Diode 36 is electrically coupled to power supply potential OVSS.The grid of N transistor npn npn M3 is electrically coupled to control signal S2, and the drain electrode of N transistor npn npn M3 is electrically coupled to another power supply potential OVDD, and the source electrode of N transistor npn npn M3 is electrically coupled to the source electrode of P transistor npn npn M2.The two ends of capacitor C 1 are electrically coupled to the grid of P transistor npn npn M2 and the source electrode of P transistor npn npn M2 respectively.The two ends of capacitor C 2 are electrically coupled to the drain electrode of N transistor npn npn M3 and the source electrode of N transistor npn npn M3 respectively.For the concrete start process of driving circuit 32, the concrete start process of itself and driving circuit 22 shown in Figure 2 is basic identical, so do not repeat them here.

Fig. 6 shows another driving circuit that is relevant to the embodiment of the invention and the electrical connection of Organic Light Emitting Diode.As shown in Figure 6, driving circuit 42 is suitable for for example Organic Light Emitting Diode 46 of current driving element, and it is three transistors, two electric capacity (3T2C) frameworks.Driving circuit 42 comprises transistor M1, M2 and M3 and capacitor C 1 and C2, and each transistor M1, M2 and M3 are all the P transistor npn npn.In present embodiment, transistor M1, M2 and M3 all use as switch, and grid, drain electrode and the source electrode of each transistor M1, M2 and M3 are respectively the control end of switch, first path terminal and alternate path end; And whether transistor M1, M2 and M3 constitute in order to decision makes electric current flow through the switch module of Organic Light Emitting Diode 46.

Particularly, the grid of P transistor npn npn M1 is electrically coupled to control signal S1, and determine whether the current potential on the data line DL to be passed to from the source electrode of P transistor npn npn M1 drain electrode, the source electrode of P transistor npn npn M1 and the data line DL electric property coupling of P transistor npn npn M1 according to control signal S1.The grid of P transistor npn npn M2 is electrically coupled to the drain electrode of P transistor npn npn M1, and the drain electrode of P transistor npn npn M2 is electrically coupled to the positive pole of Organic Light Emitting Diode 46, and the negative pole of Organic Light Emitting Diode 46 is electrically coupled to power supply potential OVSS.The grid of P transistor npn npn M3 is electrically coupled to control signal S2, and the drain electrode of P transistor npn npn M3 is electrically coupled to the source electrode of P transistor npn npn M2, and the source electrode of P transistor npn npn M3 is electrically coupled to another power supply potential OVDD.First end of capacitor C 1 and second end are electrically coupled to the grid of P transistor npn npn M2 and the source electrode of P transistor npn npn M2 respectively.First end of capacitor C 2 and second end are electrically coupled to the drain electrode of P transistor npn npn M3 and the source electrode of P transistor npn npn M3 respectively.

Describe the concrete start process of driving circuit 42 in detail below in conjunction with Fig. 6 and Fig. 7, Fig. 7 shows the sequential chart of a plurality of signals that are relevant to driving circuit 42.

Particularly, at time point t1, control signal S1 saltus step for low level, control signal S2 for low level and data line DL provide to the data-signal Data of the source electrode of P transistor npn npn M1 be precharge potential (following will represent it) with Vref, this moment P transistor npn npn M1, M2 and all conductings of M3 makes the precharge potential Vref on the data line DL begin to be passed to first end of capacitor C 1; The grid potential of P transistor npn npn M2 (following will represent it with Vg) is Vref, and the source potential of transistor M2 (following will represent it with Vs) is OVDD.

At time point t2, control signal S1 still is precharge potential Vref for low level, control signal S2 saltus step for high level and data line DL provide to the data-signal Data of the source electrode of P transistor npn npn M1, this moment P transistor npn npn M1 and M2 conducting and P transistor npn npn M3 ends makes power supply potential OVDD be stopped to be directed into the drain electrode of the P transistor npn npn M3 of driving circuit 42 inside; The grid potential Vg of P transistor npn npn M2 is Vref, because of P transistor npn npn M2 conducting, its conducting electric current reaches (Vref+Vth) afterwards to the source potential Vs rising that capacitor C 2 charges to P transistor npn npn M2, P transistor npn npn M2 ends, electric current is zero and no longer continuation charging, the source potential Vs of P transistor npn npn M2 is fixed to (Vref+Vth), and wherein Vth is the critical voltage of P transistor npn npn M2.

At time point t3, control signal S1 is that low level, control signal S2 are high level, P transistor npn npn M1 conducting and P transistor npn npn M3 ends, and the precharge potential Vref on the data line DL begin to be adjusted into write data current potential (following will represent it) with Vdata after, P transistor npn npn M2 begins conducting; The grid potential Vg of P transistor npn npn M2 is Vdata, and the source potential Vs of P transistor npn npn M2 becomes [(Vref+Vth)+a (Vdata-Vref)], wherein a=C1/ (C1+C2).

After time point t4, light emitting diode 46 is in glow phase, control signal S1 gets back to precharge potential Vref for low level and data line DL provide to the data-signal Data of the source electrode of P transistor npn npn M1 by writing data current potential Vdata for high level, control signal S2, this moment P transistor npn npn M1 by and P transistor npn npn M2 and M3 conducting make current potential on the data line DL stop to be passed to first end of the capacitor C 1 of driving circuit 42 inside; The grid potential Vg of P transistor npn npn M2 is [Vdata+OVDD-Vref-Vth-a (Vdata-Vref)], and the source potential Vs of P transistor npn npn M2 becomes OVDD, flows through the electric current I ds=k (Vsg-Vth) of light emitting diode 46 this moment 2=k[(1-a) (Vref-Vdata)] 2, this shows, flow through the electric current of light emitting diode 46 and the critical voltage Vth of P transistor npn npn M2 and have nothing to do, got rid of of the influence of transistor processing procedure factor to the electric current of the Organic Light Emitting Diode 46 of flowing through.

In sum, the embodiment of the invention designs by the structural arrangements to driving circuit, make driving circuit comprise three switches for example transistor and two electric capacity, for example the size of current of Organic Light Emitting Diode is irrelevant in glow phase and transistorized critical voltage size for current driving element so that flow through, and has got rid of the influence of transistor processing procedure factor to the electric current of the Organic Light Emitting Diode of flowing through.

In addition, any those skilled in the art also can do suitably change to driving circuit and driving method that the above embodiment of the present invention proposes, for example suitably change transistorized kind (P type or N type), with electrical connection exchange of each transistorized source electrode and drain electrode or the like.

Though the present invention discloses as above with preferred embodiment; right its is not in order to limit the present invention; any those skilled in the art; without departing 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 appended the claim scope person of defining.

Claims (10)

1. driving circuit, be suitable for the drive current driving element, this current driving element has first end and second end, and this of this current driving element first end is electrically coupled to first preset potential, this driving circuit has a plurality of switches, each these a plurality of switch has control end, first path terminal and alternate path end, and this driving circuit comprises:
First switch, this control end of this first switch is electrically coupled to first control signal, and determines whether the current potential on the data line to be passed to from this first path terminal of this first switch this alternate path end of this first switch according to this first control signal;
Second switch, this control end of this second switch are electrically coupled to this alternate path end of this first switch, and this of this second switch first path terminal is electrically coupled to this second end of this current driving element;
The 3rd switch, this control end of the 3rd switch is electrically coupled to second control signal, this first path terminal of the 3rd switch is electrically coupled to this alternate path end of this second switch, and this alternate path end of the 3rd switch is electrically coupled to second preset potential;
First electric capacity, two ends are electrically coupled to this control end of this second switch and this alternate path end of this second switch respectively; And
Second electric capacity, two ends are electrically coupled to this first path terminal of the 3rd switch and this alternate path end of the 3rd switch respectively.
2. driving circuit according to claim 1, wherein the capacitance of this second electric capacity is greater than the capacitance of this first electric capacity.
3. driving circuit according to claim 1, wherein this first switch, this second switch and the 3rd switch are all the N transistor npn npn.
4. driving circuit according to claim 1, wherein this first switch and the 3rd switch are the N transistor npn npn, this second switch is the P transistor npn npn.
5. driving circuit according to claim 1, wherein this first switch, this second switch and the 3rd switch are all the P transistor npn npn.
6. the driving method of a current driving element is applicable to driving circuit as claimed in claim 1, and this driving method comprises:
At very first time point, this first switch, this second switch and all conductings of the 3rd switch make precharge potential on this data line begin to be passed to this first end of this first electric capacity;
At second time point, this first switch and this second switch conducting and the 3rd switch ends begin to make this second preset potential to stop to be fed to this driving circuit inside;
At the 3rd time point, this first switch conduction and the 3rd switch ends begins to adjust current potential on this data line for after writing the data current potential, and this second switch begins conducting; And
After the 4th time point, this first switch ends and this second switch and the 3rd switch conduction, make current potential on this data line stop to be passed to this first electric capacity this first end, make this second preset potential begin to be fed to this driving circuit inside, and make the current potential on this data line get back to this precharge potential
Wherein, this second time point is later than this very first time point, and the 3rd time point is later than this second time point, and the 4th time point is later than the 3rd time point.
7. a driving circuit is suitable for the drive current driving element, and this current driving element has first end and second end, and this first end of this current driving element is electrically coupled to first preset potential, and this driving circuit comprises:
Switch module is electrically coupled to this second end and second preset potential of data line, this current driving element, and whether this switch module makes electric current flow through this current driving element in order to decision;
First electric capacity, have first end and second end, this first end of this first electric capacity and this second end are electrically coupled to the different nodes in this switch module respectively, and this first end of this first electric capacity because of the electric property coupling relation at the current potential that receives between given period on this data line; And
Second electric capacity has first end and second end, and this first end of this second electric capacity and this second end of this first electric capacity be electric property coupling mutually, and this second end of this second electric capacity is electrically coupled to this second preset potential.
8. driving circuit according to claim 7, wherein the capacitance of this second electric capacity is greater than the capacitance of this first electric capacity.
9. driving circuit according to claim 7, wherein this switch module has a plurality of switches, and each these a plurality of switch has control end, first path terminal and alternate path end respectively, and this switch module comprises:
First switch, this control end of this first switch is electrically coupled to first control signal, and determines whether the current potential on this data line to be passed to from this first path terminal of this first switch this alternate path end of this first switch according to this first control signal;
Second switch, this control end of this second switch are electrically coupled to this alternate path end of this first switch, and this of this second switch first path terminal is electrically coupled to this second end of this current driving element;
The 3rd switch, this control end of the 3rd switch is electrically coupled to second control signal, this first path terminal of the 3rd switch is electrically coupled to this alternate path end of this second switch, and this alternate path end of the 3rd switch is electrically coupled to this second preset potential.
10. driving circuit according to claim 9, wherein this first end of this first electric capacity and this second end are electrically coupled to this control end of this second switch and this alternate path end of this second switch respectively, and this first end of this second electric capacity and this second end then are electrically coupled to this alternate path end of this second switch and this alternate path end of the 3rd switch respectively.
CN201010163563A 2010-04-16 2010-04-16 Drive circuit for current drive element and drive method CN101859539A (en)

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Cited By (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN102593151A (en) * 2011-12-30 2012-07-18 友达光电股份有限公司 Pixel Structure, driven method thereof and self-emitting display applying the structure
CN103035197A (en) * 2011-10-07 2013-04-10 元太科技工业股份有限公司 Active type organic light emitting diode pixel circuit and operating method thereof
CN103646630A (en) * 2013-12-23 2014-03-19 南京中电熊猫液晶显示科技有限公司 Organic light-emitting diode (OLED) pixel driving circuit, display panel and driving method
CN105469743A (en) * 2016-01-29 2016-04-06 深圳市华星光电技术有限公司 Pixel compensating circuit, scanning driving circuit and panel display device
US9384694B2 (en) 2014-04-23 2016-07-05 Au Optronics Corporation Display panel and driving method thereof
WO2018223712A1 (en) * 2017-06-05 2018-12-13 京东方科技集团股份有限公司 Pixel circuit and drive method therefor, display panel and display apparatus
CN109637454A (en) * 2018-12-29 2019-04-16 深圳市华星光电半导体显示技术有限公司 Light-emitting diode pixel circuit and display panel
CN109979384A (en) * 2019-04-25 2019-07-05 京东方科技集团股份有限公司 Pixel-driving circuit, pixel circuit, display device and image element driving method
WO2020177258A1 (en) * 2019-03-07 2020-09-10 深圳市华星光电半导体显示技术有限公司 Pixel drive circuit and display panel

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN1652185A (en) * 2005-03-22 2005-08-10 友达光电股份有限公司 Picture element array and its picture quality improving method
EP1591993B1 (en) * 2004-04-29 2007-10-10 Samsung SDI Co., Ltd. Light-emitting display device
CN101609840A (en) * 2008-06-17 2009-12-23 三星移动显示器株式会社 Pixel and utilize the organic light-emitting display device of described pixel

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1591993B1 (en) * 2004-04-29 2007-10-10 Samsung SDI Co., Ltd. Light-emitting display device
CN1652185A (en) * 2005-03-22 2005-08-10 友达光电股份有限公司 Picture element array and its picture quality improving method
CN101609840A (en) * 2008-06-17 2009-12-23 三星移动显示器株式会社 Pixel and utilize the organic light-emitting display device of described pixel

Cited By (17)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
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CN103035197B (en) * 2011-10-07 2015-07-29 元太科技工业股份有限公司 Active organic light-emitting diode image element circuit and method of operating thereof
CN102593151A (en) * 2011-12-30 2012-07-18 友达光电股份有限公司 Pixel Structure, driven method thereof and self-emitting display applying the structure
US8947326B2 (en) 2011-12-30 2015-02-03 Au Optronics Corp. Pixel circuit, driving method thereof and self-emitting display using the same
CN102593151B (en) * 2011-12-30 2015-06-17 友达光电股份有限公司 Pixel Structure, driven method thereof and self-emitting display applying the structure
CN103646630A (en) * 2013-12-23 2014-03-19 南京中电熊猫液晶显示科技有限公司 Organic light-emitting diode (OLED) pixel driving circuit, display panel and driving method
CN103646630B (en) * 2013-12-23 2015-12-02 南京中电熊猫液晶显示科技有限公司 A kind of OLED pixel-driving circuit, display panel and driving method
US9384694B2 (en) 2014-04-23 2016-07-05 Au Optronics Corporation Display panel and driving method thereof
CN105469743A (en) * 2016-01-29 2016-04-06 深圳市华星光电技术有限公司 Pixel compensating circuit, scanning driving circuit and panel display device
WO2017128465A1 (en) * 2016-01-29 2017-08-03 深圳市华星光电技术有限公司 Pixel compensation circuit, scanning drive circuit and flat display device
US10192482B2 (en) 2016-01-29 2019-01-29 Shenzhen China Star Optoelectronics Technology Co., Ltd. Pixel compensation circuits, scanning driving circuits and flat display devices
WO2018223712A1 (en) * 2017-06-05 2018-12-13 京东方科技集团股份有限公司 Pixel circuit and drive method therefor, display panel and display apparatus
US10665658B2 (en) 2017-06-05 2020-05-26 Chengdu Boe Optoelectronics Technology Co., Ltd. Pixel circuit and drive method therefor, display panel and display apparatus
CN109637454A (en) * 2018-12-29 2019-04-16 深圳市华星光电半导体显示技术有限公司 Light-emitting diode pixel circuit and display panel
CN109637454B (en) * 2018-12-29 2020-10-13 深圳市华星光电半导体显示技术有限公司 Light emitting diode pixel circuit and display panel
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