CN205282058U - Pixel drive circuit, display panel and display device - Google Patents

Pixel drive circuit, display panel and display device Download PDF

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Publication number
CN205282058U
CN205282058U CN201620006775.4U CN201620006775U CN205282058U CN 205282058 U CN205282058 U CN 205282058U CN 201620006775 U CN201620006775 U CN 201620006775U CN 205282058 U CN205282058 U CN 205282058U
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China
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described
transistor
pole
2nd
control module
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CN201620006775.4U
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Chinese (zh)
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何小祥
吴博
祁小敬
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京东方科技集团股份有限公司
成都京东方光电科技有限公司
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Priority to CN201620006775.4U priority Critical patent/CN205282058U/en
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Abstract

The utility model provides a pixel drive circuit, display panel and display device. Pixel drive circuit includes drive transistor, storage capacitance, switch -on control module, writes in control module and luminous control module into, and switch -on control module connected with the grid of writing in regulation in phase drive transistor into and drive transistor's first ploe in the threshold value compensation stage, and messenger drive transistor's drive transistor 1 is write in into storage capacitance, it writes in drive transistor's second ploe into writing in stage control data voltage into to write the entry control module. The utility model discloses a putting through control module and writing control module into and write drive transistor's threshold voltage and data voltage to the storage capacitance on the data line step by step into, control drive transistor's drive current is irrelevant with drive transistor's threshold voltage, the utility model discloses still reference voltage into storage capacitance's second end through writing the entry control module in the stage of writing in into, control is luminous when keeping the stage, and drive transistor's drive current is irrelevant with light emitting component's cut in voltage.

Description

Pixel-driving circuit, display panel and display unit

Technical field

The utility model relates to technique of display field, particularly relates to a kind of pixel-driving circuit, display panel and display unit.

Background technology

AMOLED (ActiveMatrixOrganicLightEmittingDiode, active matrix organic light-emitting diode) can luminescence be driven by the electric current driving transistor to produce when state of saturation, because when inputting identical gray scale voltage, different critical voltages can produce different driving electric currents, causes the discordance of electric current. On LTPS (low temperature polycrystalline silicon) processing procedure, the homogeneity of Vth (driving the threshold voltage of transistor) is very poor, and Vth also has drift simultaneously, and therefore traditional 2T1C pixel unit drive circuit brightness uniformity is always very poor. And adopting existing pixel-driving circuit also can exist drives the driving electric current of transistor relevant with the cut-in voltage of OLED, owing to the aging Voled along with OLED can change, so that the driving electric current driving transistor is subject to the aging impact of OLED.

Practical novel content

Main purpose of the present utility model is to provide a kind of pixel-driving circuit, display panel and display unit, to solve the problem that prior art cannot drive the driving electric current of transistor driving electric current with control driving transistor unrelated with driving the threshold voltage of transistor not emitting element burn-in effects with control.

In order to achieve the above object, the utility model provides a kind of pixel-driving circuit, comprises and drives transistor, memory capacitance, connection control module, write control module and light emitting control module, wherein,

Described driving transistor, grid is connected by the first pole of described connection control module with described driving transistor, the first voltage of supply is accessed by described light emitting control module in first pole, and the 2nd pole is connected with luminous element by described light emitting control module and passes through said write control module and be connected with data line;

Described memory capacitance, first end is connected with the grid of described driving transistor, and the 2nd end is connected with the 2nd pole of described driving transistor by described light emitting control module and passes through said write control module access reference voltage;

Described connection control module, control signal is connected in access, for each display cycle the valve value compensation stage and write the stage, first pole of the grid and described driving transistor that control described driving transistor under the control of described connection control signal connects, connect so that described driving transistor is diode, thus the threshold voltage controlling described driving transistor writes described memory capacitance;

Said write control module, access sweep signal, data voltage for controlling under the control of described sweep signal on described data line in the write stage of each display cycle writes the 2nd pole of described driving transistor, controls the 2nd end that described reference voltage writes described memory capacitance;

Described light emitting control module, access LED control signal, for controlling the first described first voltage of supply of pole access of described driving transistor under the control of described LED control signal in the valve value compensation stage of each display cycle and luminous maintenance stage, the 2nd pole controlling described driving transistor is connected with described luminous element.

During enforcement, described luminous element includes OLED;

Described Organic Light Emitting Diode, anode is connected with the 2nd end of described memory capacitance, negative electrode access the 2nd voltage of supply;

In the write stage of each display cycle, described reference voltage is less than or equals described 2nd voltage of supply.

During enforcement, described connection control module comprises: connect control transistor, and control signal is connected in grid access, and the first pole is connected with the first pole of described driving transistor, and the 2nd pole is connected with the grid of described driving transistor.

During enforcement, said write control module comprises: data writing transistor, grid access sweep signal, and the first pole is connected with described data line, and the 2nd pole is connected with the 2nd pole of described driving transistor; And,

Reference voltage writing transistor, grid accesses described sweep signal, and the first pole is connected with the 2nd end of described memory capacitance, and described reference voltage is accessed in the 2nd pole.

During enforcement, described light emitting control module comprises: the first light emitting control transistor, grid access LED control signal, the first described first voltage of supply of pole access, and the 2nd pole is connected with the first pole of described driving transistor; And,

2nd light emitting control transistor, grid accesses described LED control signal, and the first pole is connected with the 2nd pole of described driving transistor, and the 2nd pole is connected with described luminous element.

During enforcement, described driving transistor, described connection control transistor, described data writing transistor, described reference voltage writing transistor, described first light emitting control transistor and described 2nd light emitting control transistor are all n-type transistor.

During enforcement, described LED control signal is described sweep signal; Described light emitting control module comprises: the first light emitting control transistor, and grid accesses described sweep signal, and the first pole is connected with the first pole of described driving transistor, the 2nd described first voltage of supply of pole access; And,

2nd light emitting control transistor, grid accesses described sweep signal, and the first pole is connected with described luminous element, and the 2nd pole is connected with the 2nd pole of described driving transistor.

During enforcement, described driving transistor, described connection control transistor, described data writing transistor and described reference voltage writing transistor are all n-type transistor, and described first light emitting control transistor and described 2nd light emitting control transistor are all p-type transistor.

The utility model additionally provides a kind of display panel, comprises above-mentioned pixel-driving circuit.

The utility model additionally provides a kind of display unit, comprises above-mentioned display panel.

Compared with prior art, pixel-driving circuit described in the utility model, the data voltage Vdata that display panel and display unit are passed through to connect on the threshold voltage vt h of control module with write control module substep write driver transistor and data line is to memory capacitance, so that the gate source voltage driving transistor comprises Vdata+Vth, thus when controlling the luminous maintenance stage, drive the driving electric current of transistor unrelated with driving the threshold voltage vt h of transistor, reach the uniform object of display, the utility model also writes two end of memory capacitance in the write stage with reference to voltage by write control module, such that it is able to drive the driving electric current of transistor unrelated with the cut-in voltage of luminous element during the control luminous maintenance stage, so that the aging impact of the driving electric current driving transistor during the luminous maintenance stage not emitting element.

Accompanying drawing explanation

Fig. 1 is the structure iron of the pixel-driving circuit described in the utility model embodiment;

Fig. 2 A is the structure iron of the pixel-driving circuit described in another embodiment of the utility model;

Fig. 2 B is the structure iron of the utility model pixel-driving circuit described in an embodiment again;

Fig. 2 C is the structure iron of the pixel-driving circuit described in the utility model another embodiment;

Fig. 2 D is the structure iron of the pixel-driving circuit described in another embodiment of the utility model;

Fig. 2 E is the structure iron of the utility model pixel-driving circuit described in an embodiment again;

Fig. 3 is the schematic circuit of the first specific embodiment of pixel-driving circuit described in the utility model;

Fig. 4 is the working timing figure of the first specific embodiment of pixel-driving circuit described in the utility model;

Fig. 5 A is the equivalent-circuit diagram of the first specific embodiment at valve value compensation stage t1 of pixel-driving circuit described in the utility model;

Fig. 5 B is the equivalent-circuit diagram of the first specific embodiment in write stage t2 of pixel-driving circuit described in the utility model;

Fig. 5 C is the equivalent-circuit diagram of the first specific embodiment in luminescence maintenance stage t3 of pixel-driving circuit described in the utility model;

Fig. 6 is the schematic circuit of the 2nd specific embodiment of pixel-driving circuit described in the utility model;

Fig. 7 is the working timing figure of the 2nd specific embodiment of pixel-driving circuit described in the utility model.

Embodiment

Below in conjunction with the accompanying drawing in the utility model embodiment, the technical scheme in the utility model embodiment is clearly and completely described, it is clear that described embodiment is only the utility model part embodiment, instead of whole embodiments. Based on the embodiment in the utility model, those of ordinary skill in the art are not making other embodiments all obtained under creative work prerequisite, all belong to the scope of the utility model protection.

As shown in Figure 1, the pixel-driving circuit described in the utility model embodiment comprises driving transistor DTFT, memory capacitance C1, connects control module 11, writes control module 12 and light emitting control module 13, wherein,

Described driving transistor DTFT, grid is connected by the first pole of described connection control module 11 with described driving transistor DTFT, the first voltage of supply V1 is accessed by described light emitting control module 13 in first pole, and the 2nd pole is connected with luminous element LE by described light emitting control module 12 and passes through said write control module 12 and be connected with data line Data;

Described memory capacitance C1, first end A are connected with the grid of described driving transistor DTFT, and the 2nd end B is connected by the 2nd pole of described light emitting control module 12 with described driving transistor DTFT and accesses reference voltage Vref by said write control module 12;

Described connection control module 11, control signal CR is connected in access, for each display cycle the valve value compensation stage and write the stage, first pole of the grid and described driving transistor DTFT that control described driving transistor DTFT under the control of described connection control signal CR connects, connect so that described driving transistor DTFT is diode, thus the threshold voltage vt h controlling described driving transistor DTFT writes described memory capacitance C1;

Said write control module 12, access sweep signal Scan, data voltage Vdata for controlling under the control of described sweep signal Scan on described data line Data in the write stage of each display cycle writes the 2nd pole of described driving transistor DTFT, controls the 2nd end B that described reference voltage Vref writes described memory capacitance C1;

Described light emitting control module 13, access LED control signal Em, for controlling the first described first voltage of supply V1 of pole access of described driving transistor DTFT under the control of described LED control signal Em in the valve value compensation stage of each display cycle and luminous maintenance stage, the 2nd pole controlling described driving transistor DTFT is connected with described luminous element LE.

The data voltage Vdata that pixel-driving circuit described in the utility model embodiment passes through to connect on the threshold voltage vt h of control module with write control module substep write driver transistor and data line is to memory capacitance, so that the gate source voltage driving transistor comprises Vdata+Vth, thus when controlling the luminous maintenance stage, drive the driving electric current of transistor unrelated with driving the threshold voltage vt h of transistor, reach the uniform object of display, pixel-driving circuit described in the utility model embodiment also writes two end of memory capacitance in the write stage with reference to voltage by write control module, such that it is able to drive the driving electric current of transistor unrelated with the cut-in voltage of luminous element during the control luminous maintenance stage, so that the aging impact of the driving electric current driving transistor during the luminous maintenance stage not emitting element.

Concrete, in FIG, drive transistor DTFT to be n-type transistor, now, the drain electrode of the first of DTFT very DTFT, the source electrode of the 2nd of DTFT very DTFT; But when actually operating, drive transistor DTFT can also be p-type transistor.

The utility model pixel-driving circuit as shown in Figure 1 operationally,

In the valve value compensation stage in each display cycle: light emitting control module 13 controls the drain electrode that V1 writes DTFT, the source electrode of control DTFT is connected with luminous element LE; The drain electrode connecting grid and DTFT that control module 11 controls described driving transistor DTFT connects, namely DTFT is that diode connects, DTFT enters state of saturation, the gate source voltage of DTFT is Vth, now A point voltage is V1, B point voltage is the voltage difference between the 2nd end B of first end A and C1 of V1-Vth, C1 is Vth, thus the threshold voltage vt h controlling to drive transistor writes C1;

The write stage in each display cycle: light emitting control module 13 controls to disconnect the drain electrode of DTFT and the connection of the first power voltage line exporting V1, and controls the connection of source electrode and the luminous element LE disconnecting DTFT; The drain electrode connecting grid and the DTFT driving transistor DTFT described in control module 11 Sustainable Control connects, and DTFT keeps diode to connect; Write control module 12 controls the source electrode that Vdata writes DTFT, therefore A point voltage is Vdata+Vth, write control module 12 controls B point voltage and is pulled down to Vref, voltage difference between the 2nd end B of first end A and C2 of C1 is Vdata+Vth-Vref, driving the threshold voltage vt h and data voltage Vdata of transistor to write C1, now Vref can remove the voltage of the terminal of the luminous element LE that previous frame is connected with the source electrode of DTFT;

The luminous maintenance stage in each display cycle: the source electrode that light emitting control module 13 controls the drain electrode access V1 of DTFT and controls DTFT is connected with the 2nd end B of luminous element LE and memory capacitance C1 respectively, connect the connection that control module 11 controls to disconnect between the grid of DTFT and the drain electrode of DTFT, the 2nd end B that write control module 12 controls C1 stops access Vref and controls the connection between the source electrode of disconnection DTFT and Data, thus the gate source voltage Vgs of DTFT be C1 first end A and C1 the 2nd end B between voltage difference, owing to the voltage difference at C1 two ends can not be suddenlyd change, therefore voltage difference between the 2nd end B of now first end A and C1 of C1 is still Vdata+Vth-Vref, thus the driving electric current controlling DTFT is unrelated with the threshold voltage vt h of DTFT,

And owing to writing the source electrode of DTFT in said write stage Vref, thus the situation that the gate source voltage of DTFT is relevant with the cut-in voltage of LE when the described luminous maintenance stage that the cut-in voltage that the source voltage avoiding DTFT is luminous element LE causes, so that unrelated with the cut-in voltage of luminous element LE at the driving electric current in described luminous maintenance stage DTFT, so that the aging impact of this driving electric current not emitting element.

Concrete, if not adopting Vref to write the source electrode of DTFT in the write stage, but the words that the 2nd end B of C1 is directly connected with luminous element LE, it is then the cut-in voltage Vle of LE at the voltage VB of the 2nd end B in write stage C1, voltage difference between the 2nd end B of first end A and C1 of C1 is Vdata+Vth-Vle, owing to the voltage difference at C1 two ends can not be suddenlyd change, then luminescence keep stage C1 first end A and C1 the 2nd end B between voltage difference be maintained Vdata+Vth-Vle, like this driving electric current of driving light emission drive transistor element luminescence will be relevant with the cut-in voltage of luminous element, described driving electric current can be subject to the aging impact of luminous element.

Concrete, as shown in Figure 2 A, described luminous element can include OLED OLED;

Described Organic Light Emitting Diode OLED, anode is connected with the 2nd end of described memory capacitance C1, negative electrode access the 2nd voltage of supply V2;

Preferably, in the write stage of each display cycle, described reference voltage Vref is less than or equals described 2nd voltage of supply V2, thus controls in said write stage Organic Light Emitting Diode OLED not luminous, to extend the life-span of OLED.

Preferably, the time that the described valve value compensation stage continues is less than the scheduled time;

Owing to being by being in the driving transistor driving of state of saturation and luminescence at described valve value compensation stage luminous element, in order to reduce the impact of display effect, the time that the valve value compensation stage continues need to be reduced as far as possible.

Concrete, as shown in Figure 2 B, described connection control module comprises: connect control transistor T1, and control signal CR is connected in grid access, and the first pole is connected with first pole of described driving transistor DTFT, and the 2nd pole is connected with the grid of described driving transistor DTFT;

In fig. 2b, described connection control transistor T1 is n-type transistor.

Concrete, as shown in Figure 2 C, said write control module comprises: data writing transistor T2, grid access sweep signal Scan, and the first pole is connected with described data line Data, and the 2nd pole is connected with the 2nd pole of described driving transistor DTFT; And,

Reference voltage writing transistor T3, grid accesses described sweep signal Scan, and the first pole is connected with the 2nd end of described memory capacitance Cs, and described reference voltage Vref is accessed in the 2nd pole;

In fig. 2 c, described data writing transistor T2 and described reference voltage writing transistor T3 is n-type transistor.

Concrete, as shown in Figure 2 D, described light emitting control module can comprise:

First light emitting control transistor T4, grid access LED control signal Em, the first described first voltage of supply V1 of pole access, the 2nd pole is connected with first pole of described driving transistor DTFT; And,

2nd light emitting control transistor T5, grid accesses described LED control signal Em, and the first pole is connected with the 2nd pole of described driving transistor DTFT, and the 2nd pole is connected with the anode of described Organic Light Emitting Diode OLED;

In figure 2d, described first light emitting control transistor T4 and described 2nd light emitting control transistor T5 is n-type transistor.

Concrete, as shown in Figure 2 E, described LED control signal Em is sweep signal Scan;

Described light emitting control module comprises: the first light emitting control transistor T4, and grid accesses described sweep signal Scan, and the first pole is connected with first pole of described driving transistor DTFT, the 2nd described first voltage of supply V1 of pole access; And,

2nd light emitting control transistor T5, grid accesses described sweep signal Scan, and the first pole is connected with the anode of described Organic Light Emitting Diode OLED, and the 2nd pole is connected with the 2nd pole of described driving transistor DTFT.

Concrete, in Fig. 2 E, described first light emitting control transistor and described 2nd light emitting control transistor are all p-type transistor.

The transistor adopted in all embodiments of the utility model can be all the device that thin film transistor or field effect transistor or other characteristics are identical. In the utility model embodiment, for the two poles of the earth except grid of transistor are called the first pole and the 2nd pole, wherein, first pole and the 2nd extremely can exchange along with the change of current direction, also i.e. the first very source electrode, and the 2nd very drains, or, first very drains, the 2nd very source electrode. In addition, according in characteristic the utility model embodiment of transistor adopt transistor can be n-type transistor or p-type transistor.

According to two specific embodiments, pixel-driving circuit described in the utility model is described below.

As shown in Figure 3, the first specific embodiment of pixel-driving circuit described in the utility model comprises driving transistor DTFT, memory capacitance C1, connects control module, writes control module and light emitting control module;

The first end A of described memory capacitance is connected with the grid of described driving transistor DTFT;

Described connection control module comprises: connect control transistor T1, and control signal CR is connected in grid access, and drain electrode is connected with the drain electrode of described driving transistor DTFT, and source electrode is connected with the grid of described driving transistor DTFT;

Said write control module comprises: data writing transistor T2, and grid access sweep signal Scan, drains and be connected with the data line Data exporting data voltage Vdata, and source electrode is connected with the source electrode of described driving transistor DTFT; And,

Reference voltage writing transistor T3, grid accesses described sweep signal Scan, and the first pole is connected with the 2nd end B of described memory capacitance C1, the 2nd pole access reference voltage Vref;

Described light emitting control module comprises: the first light emitting control transistor T4, grid access LED control signal Em, the first pole access high level VDD, and the 2nd pole is connected with the drain electrode of described driving transistor DTFT; And,

2nd light emitting control transistor T5, grid accesses described LED control signal Em, and the first pole is connected with the source electrode of described driving transistor DTFT, and the 2nd pole is connected with the anode of Organic Light Emitting Diode OLED;

The negative electrode access lower level VSS of described Organic Light Emitting Diode OLED;

Described driving transistor DTFT, described connection control transistor T1, described data writing transistor T2, described reference voltage writing transistor T3, described first light emitting control transistor T4 and described 2nd light emitting control transistor T5 are n-type transistor.

As shown in Figure 4, the first specific embodiment of the utility model pixel-driving circuit as shown in Figure 3 operationally,

At valve value compensation stage t1, CR and Em is high level, and Scan is lower level, T1, T4 and T5 open, T2 and T3 closes, and as shown in Figure 5A, drives transistor DTFT to be that diode connects, DTFT enters state of saturation, the gate source voltage Vgs of DTFT is the threshold voltage vt h of DTFT, and A point voltage is VDD, B point voltage is VDD-Vth, voltage difference between the 2nd end B of first end A and C1 of C1 is Vth, drives the threshold voltage vt h of transistor DTFT to write memory capacitance C1;

In write stage t2, CR and Scan is high level, Em is lower level, T1, T2 and T3 opens, T4 and T5 closes, as shown in Figure 5 B, transistor DTFT is driven to keep diode to connect, the gate source voltage Vgs of DTFT is Vth, the source electrode access data voltage Vdata of DTFT, therefore A point voltage is Vdata+Vth, B point voltage is pulled down to Vref, therefore voltage difference between the 2nd end B of first end A and C2 of C1 is Vdata+Vth-Vref, the threshold voltage vt h and data voltage Vdata of transistor DTFT is driven to write memory capacitance C1, now Vref can remove the anode voltage of previous frame OLED,

Stage t3 is kept in luminescence, CR and Scan is lower level, Em is high level, and T1, T3 and T3 close, T4 and T5 opens, as shown in Figure 5 C, the voltage driven DTFT of the first end A of memory capacitance C1, makes OLED start luminescence, and the voltage VB of the 2nd end B of memory capacitance C1 is the cut-in voltage Voled of OLED, owing to the voltage difference at C1 two ends can not be suddenlyd change, the therefore voltage VA=Vdata+Vth-Vref+Voled of the first end A of memory capacitance C1;

The gate source voltage Vgs=VA-VB==Vdata+Vth-Vref of DTFT;

Electric current (i.e. the driving electric current of the DTFT) I then flowing through OLED is as follows:

I=K �� (Vgs-Vth)2==K �� (Vdata-Vref)2;

OLED keeps luminous state, and it is unrelated with Vth to keep stage t3 to flow through the electric current of OLED in luminescence, so just can improve the homogeneity of electric current, thus reach the even of display brightness.

And, if the first specific embodiment of pixel-driving circuit described in the utility model as shown in Figure 3 does not comprise T3, namely the 2nd end B of reference voltage Vref write C1 is not controlled in write stage t2, then the voltage of the 2nd end of C1 is then the cut-in voltage Voled of OLED, like this stage t3 is kept to drive the gate source voltage of transistor DTFT will have relation with the cut-in voltage Voled of OLED in luminescence, owing to the aging Voled along with OLED can change, the electric current flowing through OLED so then can be subject to the aging impact of OLED, and the pixel driving current described in the utility model embodiment is owing to have employed two end (in figure 3 have employed T3) of write control module at write stage control reference voltage Vref write C1, then can avoid the generation of above situation.

Concrete, if not adopting Vref to write the source electrode of DTFT in write stage t2, but the words that the 2nd end B of C1 is directly connected with the anode of OLED, it is then the cut-in voltage Voled of OLED at the voltage VB of the 2nd end B in write stage C1, voltage difference between the 2nd end B of first end A and C1 of C1 is Vdata++Vth-Voled, owing to the voltage difference at C1 two ends can not be suddenlyd change, then luminescence keep stage C1 first end A and C1 the 2nd end B between voltage difference be maintained Vdata++Vth-Voled, like this driving electric current of driving transistor driving OLED luminescence will be relevant with the cut-in voltage Voled of OLED, described driving electric current can be subject to the aging impact of OLED.

As shown in Figure 6, the 2nd specific embodiment of pixel-driving circuit described in the utility model comprises driving transistor DTFT, memory capacitance C1, connects control module, writes control module and light emitting control module;

The first end A of described memory capacitance is connected with the grid of described driving transistor DTFT;

Described connection control module comprises: connect control transistor T1, and control signal CR is connected in grid access, and drain electrode is connected with the drain electrode of described driving transistor DTFT, and source electrode is connected with the grid of described driving transistor DTFT;

Said write control module comprises:

Data writing transistor T2, grid access sweep signal Scan, drains and is connected with the data line Data exporting data voltage Vdata, and source electrode is connected with the source electrode of described driving transistor DTFT; And,

Reference voltage writing transistor T3, grid accesses described sweep signal Scan, and the first pole is connected with the 2nd end B of described memory capacitance C1, the 2nd pole access reference voltage Vref;

Described light emitting control module comprises:

First light emitting control transistor T4, grid accesses described sweep signal Scan, and source electrode is connected with the drain electrode of described driving transistor DTFT, drain electrode access high level VDD; And,

2nd light emitting control transistor T5, grid accesses described sweep signal Scan, and source electrode is connected with the anode of Organic Light Emitting Diode OLED, and drain electrode is connected with the source electrode of described driving transistor DTFT;

Described driving transistor DTFT, described connection control transistor T1, described data writing transistor T2 and described reference voltage writing transistor T3 are n-type transistor, and described first light emitting control transistor T4 and described 2nd light emitting control transistor T5 is p-type transistor.

As shown in Figure 7, the 2nd specific embodiment of the utility model pixel-driving circuit as shown in Figure 6 operationally,

At valve value compensation stage t1, CR is high level, and Scan is lower level, and T1, T4 and T5 open, T2 and T3 closes, driving transistor DTFT to be that diode connects, DTFT enters state of saturation, and the gate source voltage Vgs of DTFT is the threshold voltage vt h of DTFT, A point voltage is VDD, B point voltage is the voltage difference between the 2nd end B of first end A and C1 of VDD-Vth, C1 is Vth, drives the threshold voltage vt h of transistor DTFT to write memory capacitance C1;

In write stage t2, CR and Scan is high level, T1, T2 and T3 opens, T4 and T5 closes, as shown in Figure 5 B, transistor DTFT is driven to keep diode to connect, the gate source voltage Vgs of DTFT is Vth, the source electrode access data voltage Vdata of DTFT, therefore A point voltage is Vdata+Vth, B point voltage is pulled down to Vref, therefore voltage difference between the 2nd end B of first end A and C2 of C1 is Vdata+Vth-Vref, the threshold voltage vt h and data voltage Vdata of transistor DTFT is driven to write memory capacitance C1, now Vref can remove the anode voltage of previous frame OLED,

Stage t3 is kept in luminescence, CR and Scan is lower level, T1, T3 and T3 close, T4 and T5 opens, as shown in Figure 5 C, and the voltage driven DTFT of the first end A of memory capacitance C1, OLED is made to start luminescence, the voltage VB of the 2nd end B of memory capacitance C1 is the cut-in voltage Voled of OLED, owing to the voltage difference at C1 two ends can not be suddenlyd change, and the therefore voltage VA=Vdata+Vth-Vref+Voled of the first end A of memory capacitance C1;

The gate source voltage Vgs=VA-VB==Vdata+Vth-Vref of DTFT;

Electric current (i.e. the driving electric current of the DTFT) I then flowing through OLED is as follows:

I=K �� (Vgs-Vth)2==K �� (Vdata-Vref)2;

OLED keeps luminous state, and it is unrelated with Vth to keep stage t3 to flow through the electric current of OLED in luminescence, so just can improve the homogeneity of electric current, thus reach the even of display brightness.

And, if the 2nd specific embodiment of pixel-driving circuit described in the utility model as shown in Figure 6 does not comprise T3, namely the 2nd end B of reference voltage Vref write C1 is not controlled in write stage t2, then the voltage of the 2nd end of C1 is then the cut-in voltage Voled of OLED, like this stage t3 is kept to drive the gate source voltage of transistor DTFT will have relation with the cut-in voltage Voled of OLED in luminescence, owing to the aging Voled along with OLED can change, the electric current flowing through OLED so then can be subject to the aging impact of OLED, and the pixel driving current described in the utility model embodiment is owing to have employed two end (in figure 6 have employed T3) of write control module at write stage control reference voltage Vref write C1, then can avoid the generation of above situation.

Display panel described in the utility model embodiment comprises above-mentioned pixel-driving circuit.

Display unit described in the utility model embodiment comprises above-mentioned display panel.

Described display unit can be such as: Electronic Paper, OLED (OrganicLight-EmittingDiode, Organic Light Emitting Diode) display unit, mobile phone, panel computer, televisor, indicating meter, notebook computer, number are to any product or parts with display function such as frame, navigating instrument

The above is preferred implementation of the present utility model; should be understood that; for those skilled in the art; under the prerequisite not departing from principle described in the utility model; can also making some improvements and modifications, these improvements and modifications also should be considered as protection domain of the present utility model.

Claims (10)

1. a pixel-driving circuit, it is characterised in that, comprise and drive transistor, memory capacitance, connection control module, write control module and light emitting control module, wherein,
Described driving transistor, grid is connected by the first pole of described connection control module with described driving transistor, the first voltage of supply is accessed by described light emitting control module in first pole, and the 2nd pole is connected with luminous element by described light emitting control module and passes through said write control module and be connected with data line;
Described memory capacitance, first end is connected with the grid of described driving transistor, and the 2nd end is connected with the 2nd pole of described driving transistor by described light emitting control module and passes through said write control module access reference voltage;
Described connection control module, control signal is connected in access, for each display cycle the valve value compensation stage and write the stage, first pole of the grid and described driving transistor that control described driving transistor under the control of described connection control signal connects, connect so that described driving transistor is diode, thus the threshold voltage controlling described driving transistor writes described memory capacitance;
Said write control module, access sweep signal, data voltage for controlling under the control of described sweep signal on described data line in the write stage of each display cycle writes the 2nd pole of described driving transistor, controls the 2nd end that described reference voltage writes described memory capacitance;
Described light emitting control module, access LED control signal, for controlling the first described first voltage of supply of pole access of described driving transistor under the control of described LED control signal in the valve value compensation stage of each display cycle and luminous maintenance stage, the 2nd pole controlling described driving transistor is connected with described luminous element.
2. pixel-driving circuit as claimed in claim 1, it is characterised in that, described luminous element includes OLED;
Described Organic Light Emitting Diode, anode is connected with the 2nd end of described memory capacitance, negative electrode access the 2nd voltage of supply;
In the write stage of each display cycle, described reference voltage is less than or equals described 2nd voltage of supply.
3. pixel-driving circuit as claimed in claim 1 or 2, it is characterized in that, described connection control module comprises: connect control transistor, and control signal is connected in grid access, first pole is connected with the first pole of described driving transistor, and the 2nd pole is connected with the grid of described driving transistor.
4. pixel-driving circuit as claimed in claim 3, it is characterised in that, said write control module comprises: data writing transistor, grid access sweep signal, and the first pole is connected with described data line, and the 2nd pole is connected with the 2nd pole of described driving transistor; And,
Reference voltage writing transistor, grid accesses described sweep signal, and the first pole is connected with the 2nd end of described memory capacitance, and described reference voltage is accessed in the 2nd pole.
5. pixel-driving circuit as claimed in claim 4, it is characterized in that, described light emitting control module comprises: the first light emitting control transistor, grid access LED control signal, first described first voltage of supply of pole access, the 2nd pole is connected with the first pole of described driving transistor; And,
2nd light emitting control transistor, grid accesses described LED control signal, and the first pole is connected with the 2nd pole of described driving transistor, and the 2nd pole is connected with described luminous element.
6. pixel-driving circuit as claimed in claim 5, it is characterized in that, described driving transistor, described connection control transistor, described data writing transistor, described reference voltage writing transistor, described first light emitting control transistor and described 2nd light emitting control transistor are all n-type transistor.
7. pixel-driving circuit as claimed in claim 4, it is characterised in that, described LED control signal is described sweep signal; Described light emitting control module comprises: the first light emitting control transistor, and grid accesses described sweep signal, and the first pole is connected with the first pole of described driving transistor, the 2nd described first voltage of supply of pole access; And,
2nd light emitting control transistor, grid accesses described sweep signal, and the first pole is connected with described luminous element, and the 2nd pole is connected with the 2nd pole of described driving transistor.
8. pixel-driving circuit as claimed in claim 7, it is characterized in that, described driving transistor, described connection control transistor, described data writing transistor and described reference voltage writing transistor are all n-type transistor, and described first light emitting control transistor and described 2nd light emitting control transistor are all p-type transistor.
9. a display panel, it is characterised in that, comprise such as pixel-driving circuit as described in any claim in claim 1 to 8.
10. a display unit, it is characterised in that, comprise display panel as claimed in claim 9.
CN201620006775.4U 2016-01-04 2016-01-04 Pixel drive circuit, display panel and display device CN205282058U (en)

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN105427805A (en) * 2016-01-04 2016-03-23 京东方科技集团股份有限公司 Pixel driving circuit and method, display panel, and display apparatus

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN105427805A (en) * 2016-01-04 2016-03-23 京东方科技集团股份有限公司 Pixel driving circuit and method, display panel, and display apparatus
WO2017117940A1 (en) * 2016-01-04 2017-07-13 京东方科技集团股份有限公司 Pixel drive circuit, pixel drive method, display panel and display device
CN105427805B (en) * 2016-01-04 2018-09-14 京东方科技集团股份有限公司 Pixel-driving circuit, method, display panel and display device
US10403201B2 (en) 2016-01-04 2019-09-03 Boe Technology Group Co., Ltd. Pixel driving circuit, pixel driving method, display panel and display device

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