CN104409042B - Image element circuit and its driving method, display panel, display device - Google Patents

Image element circuit and its driving method, display panel, display device Download PDF

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Publication number
CN104409042B
CN104409042B CN201410734455.6A CN201410734455A CN104409042B CN 104409042 B CN104409042 B CN 104409042B CN 201410734455 A CN201410734455 A CN 201410734455A CN 104409042 B CN104409042 B CN 104409042B
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transistor
drive signal
driving
signal
electric capacity
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CN201410734455.6A
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CN104409042A (en
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马志丽
钱栋
顾寒昱
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上海天马有机发光显示技术有限公司
天马微电子股份有限公司
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Abstract

The invention discloses a kind of image element circuit and driving method, display panel, display device, wherein, image element circuit includes:The first transistor, transistor seconds, third transistor, the 4th transistor, the 5th transistor, driving transistor, the first electric capacity and the second electric capacity, by the cooperation between each transistor and electric capacity, one of at least up to following beneficial effect of the present invention:So that the cross-pressure at the pressure drop of threshold voltage, power supply signal of the driving current with driving transistor in itself and light-emitting component two ends is irrelevant, eliminate the influence of above-mentioned factor, and then the effective problem for improving display device non-uniform light, improve display device luminous uniformity and display effect.

Description

Image element circuit and its driving method, display panel, display device

Technical field

The present invention relates to organic light emitting display technical field, in particular, more particularly to a kind of image element circuit and its drive Dynamic method, display panel, display device.

Background technology

Continued to develop with multimedia, Organic Light Emitting Diode (Organic Light Emitting Diode, OLED) display is subject to the advantage such as simple structure and splendid operating temperature, contrast, visual angle in monitor market Attract attention.Organic light emitting diode display includes passive matrix OLED displays and active-matrix OLED display, and active square Battle array OLED display is widely used due to low in energy consumption.In actually used, it is found that organic light emitting diode display is present luminous Uneven phenomenon.

The content of the invention

In view of this, the present invention is provided a kind of image element circuit and its driving method, display panel, display device, lead to Overcompensation drives the threshold voltage of the transistor of light-emitting component, eliminates the electric current pressure of drive transistor threshold voltage and supply voltage Drop influence, and then eliminate the phenomenon of display device non-uniform light.

On the one hand, the preferred embodiment of the present invention provides a kind of image element circuit, including:The first transistor, transistor seconds, Three transistors, the 4th transistor, the 5th transistor and driving transistor, the first electric capacity, the second electric capacity and light-emitting component, wherein,

The driving transistor is used to determine the size of driving current, and the size of the driving current is by the driving crystal The grid of pipe and the voltage difference of source electrode are determined;

The first transistor is controlled by the first drive signal, for transmitting reference voltage signal to the driving transistor Grid;

The transistor seconds is controlled by the second drive signal, for transmitting power supply voltage signal to the driving transistor Source electrode;

The third transistor is controlled by the 3rd drive signal, grid and drain electrode for controlling the driving transistor Break-make;

4th transistor is controlled by the 3rd drive signal, for transmitting data-signal to the first of second electric capacity Pole plate, the second pole plate of second electric capacity is connected to the drain electrode of the driving transistor;

5th transistor by fourth drive signal control, for that will be passed from the driving current of the driving transistor Transport to the light-emitting component;

First electric capacity be used for keep the driving transistor grid and source electrode voltage difference it is constant;

The negative electrode of the light-emitting component is coupled to negative electrode low potential, and is lighted in response to the driving current.

Further, the first electrode coupling of the first transistor reference electricity for receiving reference voltage signal Pressure signal input part, second electrode couples the grid of the driving transistor;

The first electrode of the transistor seconds couples the power supply voltage signal input for receiving power supply voltage signal, Second electrode couples the source electrode of the driving transistor;

The third transistor is coupled to grid and the drain electrode two ends of the driving transistor;

The first electrode of the 4th transistor couples the data signal input for receiving data-signal, second electrode Couple the first pole plate of second electric capacity;

The first electrode of the 5th transistor couples the drain electrode of the driving transistor, and second electrode coupling is described luminous The anode of element;

First electric capacity is coupled between the power supply voltage signal input and the grid of the driving transistor.

On the other hand, the preferred embodiment of the present invention provides a kind of driving method, for driving image element circuit, the pixel electricity Road includes:The first transistor, transistor seconds, third transistor, the 4th transistor, the 5th transistor and driving transistor, One electric capacity, the second electric capacity and light-emitting component, the first transistor are controlled by the first drive signal, and first electrode couples the use In the reference voltage signal input for receiving reference voltage signal, second electrode couples the grid of the driving transistor;

The transistor seconds is controlled by the second drive signal, and first electrode couples the electricity for receiving power supply voltage signal Source voltage signal inputs, second electrode couples the source electrode of the driving transistor;

The third transistor is controlled by the 3rd drive signal, and first electrode and second electrode are respectively coupled to the driving The grid of transistor and drain electrode;

4th transistor is controlled by the 3rd drive signal, and the data that first electrode couples for receiving data-signal are believed Number input, second electrode passes through the drain electrode that second electric capacity couples the driving transistor;

By fourth drive signal control, first electrode couples the drain electrode of the driving transistor to 5th transistor, the Two electrodes couple the anode of the light-emitting component;

First electric capacity is coupled between the power supply voltage signal input and the grid of the driving transistor;

The negative electrode of the light-emitting component is coupled to negative electrode low potential;

The driving method includes node reset step, threshold value crawl step, data write step and light emitting step, its In,

In the node reset step, first drive signal controls the first transistor to open, and transmits the ginseng The grid of voltage signal to the driving transistor is examined, to initialize driving transistor grid, the second drive signal control The transistor seconds is opened, and transmits the source electrode of the power supply voltage signal to the driving transistor, and other transistors are closed;

In the threshold value crawl step, first drive signal controls the first transistor to close, and the described 3rd drives Dynamic signal controls the third transistor and the 4th transistor to open, and the 4th transistor transmits data-signal to the second electric capacity The first pole plate, driving transistor conducting, until the grid and drain voltage be the supply voltage subtract it is described End during the threshold voltage of driving transistor, first electric capacity and the second electric capacity are stored with the threshold voltage;

In the data write step, second drive signal controls the transistor seconds to close, and the described 3rd drives Dynamic signal controls the third transistor and the 4th transistor to open, and the 4th transistor transmits the data-signal to described First pole plate of the second electric capacity, by second Capacitance Coupled so that the data signal transmission to the driving transistor Drain electrode;

In the light emitting step, second drive signal controls the transistor seconds to open, and the described 4th drives letter Number control the 5th transistor is opened, and the driving transistor produces driving current, to drive the light-emitting component to light.

On the other hand, the preferred embodiment of the present invention also provides a kind of display panel, including image element circuit as described above.

On the other hand, the preferred embodiment of the present invention also provides a kind of display device, including display panel as described above.

One of relative to prior art, the technical scheme that the present invention is provided at least has the following advantages that:

The present invention provides a kind of image element circuit and driving method, display panel, display device, wherein, image element circuit includes: The first transistor, transistor seconds, third transistor, the 4th transistor, the 5th transistor, driving transistor, the first electric capacity and Second electric capacity, by the cooperation between each transistor and electric capacity so that threshold value electricity of the driving current with driving transistor in itself The cross-pressure at pressure, the pressure drop of power supply signal and light-emitting component two ends is irrelevant, eliminates the influence of above-mentioned factor, and then effectively The problem of display device non-uniform light is improved, display device luminous uniformity and display effect is improve.

Brief description of the drawings

In order to illustrate more clearly about the embodiment of the present invention or technical scheme of the prior art, below will be to embodiment or existing The accompanying drawing to be used needed for having technology description is briefly described, it should be apparent that, drawings in the following description are only this Inventive embodiment, for those of ordinary skill in the art, on the premise of not paying creative work, can also basis The accompanying drawing of offer obtains other accompanying drawings.

Fig. 1 is a kind of structural representation of existing image element circuit;

Fig. 2 is the driver' s timing figure of Fig. 1 image element circuits;

A kind of image element circuit schematic diagram that Fig. 3 is provided for the preferred embodiment of the present invention;

Fig. 4 is a kind of preferred drive signal timing diagram of image element circuit in Fig. 3;

Fig. 5 a are the current path figure in T1 stages in Fig. 4;

Fig. 5 b are the current path figure in T2 stages in Fig. 4;

Fig. 5 c are the current path figure in T3 stages in Fig. 4;

Fig. 5 d are the current path figure in T4 stages in Fig. 4.

Specific embodiment

Below in conjunction with the accompanying drawing in the embodiment of the present invention, the technical scheme in the embodiment of the present invention is carried out clear, complete Site preparation is described, it is clear that described embodiment is only a part of embodiment of the invention, rather than whole embodiments.It is based on Embodiment in the present invention, it is every other that those of ordinary skill in the art are obtained under the premise of creative work is not made Embodiment, belongs to the scope of protection of the invention.

As described in background, in actually used, it is found that organic light emitting diode display has non-uniform light Phenomenon.The reason for the causing non-uniform light main threshold voltage by driving transistor with use time can occur drift or Because manufacturing process causes the threshold voltage of each transistor to be not quite similar, therefore substantial amounts of R&D direction turns to threshold drift and mends Repay, be a kind of circuit diagram of existing image element circuit, its image element circuit in organic light emitting diode display with reference to shown in Fig. 1 Using 6T2C structures, including six transistors and two electric capacity, i.e., transistor M1, transistor M2 shown in Fig. 1, transistor M3, transistor M4, transistor M5, transistor M6, and electric capacity Ca, Cst.Wherein, transistor M3 is as current drive transistor Organic Light Emitting Diode OLED provides illuminating electric current.Fig. 2 is the driver' s timing schematic diagram of Fig. 1.Image element circuit shown in Fig. 1 The course of work includes:Initial phase:S1 is low level, and S2 and emit is high level, and M5 pipes are opened, and one is reset to N1 points Low potential;Data-signal writes and grabs threshold stage:S2 is low level, S1 and be high level with emit, and M2, M3 and M4 pipe are opened Open, N1 point current potentials are changed into VDATA- | vth |;Glow phase:Emit is low level, and S1 and S2 is high level, transistor M1, crystal Pipe M3 and transistor M6 is opened, and M3 tube currents value is I=K* (Vsg- | Vth |) ^2=K* (Vdd-Vdata) ^2, it follows that The size of driving current is unrelated with the threshold value of driving transistor, compensate for threshold drift.But the size of above-mentioned driving current with Supply voltage VDD is relevant, and due to the influence of manufacturing process, and transmission VDD is to the lead of every row pixel or each sub-pixel Different in size, current voltage drop influences different when causing transmission VDD, so that being transferred to every row pixel or the power supply of each sub-pixel Voltage is not quite similar, therefore when can cause to apply same data voltage to multiple image element circuits, flows through organic hair in image element circuit The electric current of optical diode is variant, and then the phenomenon of display device non-uniform light occurs.

Embodiment one

Based on this, the embodiment of the present application provides a kind of image element circuit, with reference to shown in Fig. 3, for the embodiment of the present application is provided A kind of image element circuit structural representation, wherein, image element circuit includes:

The first transistor M1, transistor seconds M2, third transistor M3, the 4th transistor M4 and the 5th transistor M5, drive Dynamic transistor M0, the first electric capacity C1, the second electric capacity C2 and light-emitting component D;Wherein,

Driving transistor M0 is used to determining the size of driving current, the size of driving current by driving transistor M0 grid Voltage difference with source electrode is determined;

The first transistor M1 is controlled by the first drive signal S1, for transmitting reference voltage signal Vref to driving transistor The grid of M0;

Transistor seconds M2 is controlled by the second drive signal S2, for transmitting power supply voltage signal PVDD to driving transistor The source electrode of M0;

Third transistor M3 is controlled by the 3rd drive signal S3, for controlling between the grid of driving transistor M0 and drain electrode Break-make;

4th transistor M4 is controlled by the 3rd drive signal S3, for transmitting the electric capacity of data-signal Vdata to second C2's First pole plate, second pole plate of the second electric capacity C2 is coupled to the drain electrode of driving transistor M0;

5th transistor M5 is controlled by fourth drive signal S4, for the driving current transmission of self-driven transistor M0 in the future To light-emitting component D;

First electric capacity C1 be used for keep driving transistor M0 grid and source electrode voltage difference it is constant;

The negative electrode coupling negative electrode low potential Pvee of light-emitting component D, and lighted in response to driving current.

It should be noted that driving transistor M0 is PMOS, in addition, the first transistor M1, transistor seconds M2, the 3rd Transistor M3, the 4th transistor M4, the 5th transistor M5 can be PMOS, or NMOS tube, or film crystal Pipe or metal-oxide semiconductor fieldeffect transistor.If the first transistor M1, transistor seconds M2, third transistor M3, 4th transistor M4, the 5th transistor M5 are PMOSs, then first electrode refers to source electrode, and second electrode refers to drain electrode;If The first transistor M1, transistor seconds M2, third transistor M3, the 4th transistor M4, the 5th transistor M5 are NMOS tubes, then One electrode refers to drain electrode, and second electrode refers to source electrode.The first transistor M1, transistor seconds M2, the 3rd crystalline substance shown in Fig. 2 Body pipe M3, the 4th transistor M4, the 5th transistor M5 are PMOSs.

More specifically, with reference to shown in Fig. 3, in image element circuit, the first transistor M1 first electrodes are coupled for receiving The reference voltage signal input of reference voltage signal, second electrode couples the grid of driving transistor, namely first segment in Fig. 3 Point N1;Transistor seconds M2 first electrodes couple the power supply voltage signal input for receiving power supply voltage signal, the second electricity Pole couples the source electrode of driving transistor M0;Third transistor M3 first electrodes and second electrode are respectively coupled to driving transistor M0 Grid and drain electrode;4th transistor M4 first electrodes couple the data signal input for receiving data-signal, the second electricity Pole couples first pole plate of the second electric capacity C2, namely the second pole plate coupling of the 3rd node N3 in Fig. 3, the second electric capacity C2 drives crystalline substance The drain electrode of body pipe M0, namely Section Point N2 in Fig. 3;The drain electrode of the 5th transistor M5 first electrodes coupling driving transistor M0, The anode of second electrode coupling light-emitting component D;First electric capacity C1 is coupled to power supply voltage signal input and driving transistor M0 Grid between, the grid potential for keeping driving transistor M0.

In addition, it is necessary to explanation, the first transistor M1, transistor seconds M2, the 3rd crystalline substance that the embodiment of the present application is provided Any one transistor in body pipe M3, the 4th transistor M4 and the 5th transistor M5 can be N-type transistor or P-type transistor, That is the first transistor M1, transistor seconds M2, third transistor M3, the 4th transistor M4 and the 5th transistor M5 can be N-type Transistor and five transistors of P-type transistor mixing, are not specifically limited, it is only necessary to this embodiment of the present application when driving Meet the requirements.

Fig. 4 show a kind of preferred driver' s timing figure of image element circuit of the offer of embodiment one, in the driving shown in Fig. 4 In sequence, the course of work of image element circuit includes node reset step, threshold value crawl step, data write step, light emitting step, tool Body:

In node reset step, the first drive signal S1 controls the first transistor M1 to open, and transmission is with reference to electricity The grid of signal Vref to the driving transistor M0 is pressed, to initialize driving transistor grid, the second drive signal S2 controls Transistor seconds M2 is opened, and transmits the source electrode of the power supply voltage signal PVDD to driving transistor M0, third transistor M3, the Four transistor M4, the 5th transistor M5 are closed;

In threshold value crawl step, the first drive signal S1 control the first transistors M1 is closed, the 3rd drive signal S3 controls Third transistor M3 and the 4th transistor M4 is opened, the 4th transistor M4 transmission electric capacity of data-signal Vdata to second C2 The first pole plate, driving transistor M0 conducting, until its grid and drain voltage are supply voltage subtracts driving transistor End during threshold voltage, namely the current potential of first node N1 and Section Point N2 is PVDD- | Vth |.Now, the first electric capacity C1 is deposited The current potential of storage first node N1, the current potential of the second electric capacity C2 storage Section Points N2, namely the first electric capacity C1 and the second electric capacity C2 The threshold voltage vt h of the driving transistor that is stored with;

In data write step, the second drive signal S2 controls the transistor seconds M2 to close, the 3rd drive signal S3 The third transistor M3 and the 4th transistor M4 is controlled to open, then the 4th transistor transmission data-signal Vdata to the 3rd Node N3, by the coupling effect of the second electric capacity C2 so that data-signal Vdata is transmitted to the drain electrode of driving transistor M0;

In light emitting step, the second drive signal S2 controls the transistor seconds M2 to open, fourth drive signal S4 controls The transistors of M5 the 5th are opened, and driving transistor M0 produces driving current, to drive the light-emitting component to light.

The working circuit diagram of above-mentioned each step as shown in Fig. 5 a~Fig. 5 d, with reference to Fig. 4 and Fig. 5 a~Fig. 5 d, in detail Illustrate a kind of preferred driving method of embodiment one.It should be noted that it is that all transistors are equal in image element circuit that Fig. 4 is corresponding It is the situation of PMOS transistor.

The node reset step circuit diagram of the image element circuit that Fig. 5 a are provided for embodiment one, the T1 periods in corresponding diagram 4, its In, the first drive signal S1, the second drive signal S2 are low level, control the first transistor M1 and transistor seconds M2 to beat respectively Open, the first transistor M1 transmits the grid of reference voltage signal Vref to driving transistor M0, namely first node N1, with initial Change driving transistor grid, transistor seconds M2 transmits the source electrode of power supply voltage signal PVDD to driving transistor M0, and the 3rd drives Dynamic signal S3, fourth drive signal S4 are high level, and third transistor M3, the 4th transistor M4, the 5th transistor are controlled respectively M5 is closed.This step is mainly the grid of initialization driving transistor so that the current potential of N1 points is Vref, and Vref is low electricity It is flat.

The threshold value crawl step circuit diagram of the image element circuit that Fig. 5 b are provided for embodiment one, the T2 periods in corresponding diagram 4, its In, the first drive signal S1, fourth drive signal S4 are high level, control the first transistor M1 and the 5th transistor M5 to close respectively Close, the second drive signal S2, the 3rd drive signal S3 are low level, the second drive signal S2 control transistor secondses M2 is opened, 3rd drive signal S3 controls third transistor M3 and the 4th transistor M4 to open, and the 4th transistor M4 transmits data-signal First pole plate of the electric capacity of Vdata to second C2, driving transistor M0 conductings, until its grid and drain voltage are supply voltage End when subtracting the threshold voltage of driving transistor, namely the current potential of first node N1 and Section Point N2 is PVDD- | Vth |. Now, the current potential of the first electric capacity C1 storage first nodes N1, the current potential of the second electric capacity C2 storage Section Points N2, namely the first electricity Hold C1 and the second electric capacity C2 to be stored with the threshold voltage vt h of driving transistor.It should be noted that data-signal in this step The data-signal Vdata of input input is equal to reference voltage signal.This step is mainly the crawl electricity of threshold voltage vt h to first In appearance C1 and the second electric capacity C2.

The data write step circuit diagram of the image element circuit that Fig. 5 c are provided for embodiment one, the T3 periods in corresponding diagram 4, its In, the first drive signal S1, the second drive signal S2, fourth drive signal S4 are high level, control respectively the first transistor M1, Transistor seconds M1, the 5th transistor M5 are closed, and the 3rd drive signal S3 is low level, and control third transistor M3 and the 4th is brilliant Body pipe M4 is opened.4th transistor M4 transmits the node N3 of data-signal Vdata to the 3rd, and now data-signal is effective display Data-signal, and potential value is less than reference signal value.Now the potential change of the 3rd node N3 is Vdata-Vref, by the second electricity Hold the coupling effect of C2, then the potential change of Section Point N2 is:PVDD- | VTH |+(VDATA-VREF) (C2)/(C1+C2), Transmitted to first node N1 by third transistor M3, thus first node N1 current potential can also be changed into PVDD- | VTH |+ (VDATA-VREF)(C2)/(C1+C2).This step is mainly the grid for passing data signals to driving transistor.

The light emitting step circuit diagram of the image element circuit that Fig. 5 d are provided for embodiment one, the T4 periods in corresponding diagram 4, wherein, First drive signal S1 and the 3rd drive signal S3 is high level, and the first transistor M1, third transistor M3, the 4th are controlled respectively Transistor M4 is closed, and the second drive signal S2, fourth drive signal S4 are low level, and transistor seconds M2, the 5th are controlled respectively Transistor M5 is opened.Due in previous step, the current potential of first node N1 for PVDD- | VTH |+(VDATA-VREF) (C2)/ (C1+C2), so the electric current that driving transistor M0 is produced is:

I=k (VS-VG- | Vth |)2=k (Vdata-Vref) (C2)/(C1+C2))2

Above-mentioned driving current drives light-emitting component D to light, and the light-emitting component D can be Organic Light Emitting Diode.

From the above-mentioned course of work, the image element circuit of the embodiment of the present invention one passes through between each transistor and electric capacity Coordinate so that threshold voltage of the driving current not only with driving transistor in itself is unrelated, also with the pressure drop of power supply signal and light The cross-pressure at element two ends is irrelevant, it is thus eliminated that the current voltage drop of the threshold voltage shift of driving transistor, supply voltage, And influence of the cross-pressure of light-emitting component to driving current, and then the effective problem for improving non-uniform light, improve aobvious Show luminous uniformity and display effect.

It should be noted that when the transistor that embodiment one is provided is NMOS tube, the drive in above-mentioned each step The magnitude of voltage of dynamic signal is needed conversely, being capable of achieving identical function.Because the course of work is essentially identical with above-mentioned, herein no longer Describe in detail.

Embodiment two

Additionally, the preferred embodiment of the present invention additionally provides a kind of display panel, including image element circuit, wherein, image element circuit Using the image element circuit described in above-described embodiment.

The image element circuit that the display panel of embodiment two is provided, can be pure PMOS structures, or driving transistor is Pmos is managed, and other transistors are the CMOS structure of NMOS tube.In the corresponding course of work, data signal input is needed in pixel The value that size is equal to reference voltage signal is input into the threshold value crawl step of circuit.

Image element circuit in display panel is by the cooperation between each transistor and electric capacity so that driving current not only with Driving transistor threshold voltage in itself is unrelated, also irrelevant with the pressure drop of power supply signal and the cross-pressure at light-emitting component two ends, It is thus eliminated that the cross-pressure of the current voltage drop of the threshold voltage shift of driving transistor, supply voltage and light-emitting component is to driving The influence of streaming current, and then the effective problem for improving non-uniform light, improve the luminous uniformity of display and display is imitated Really.

It should be noted that the application provide display panel be not specifically limited for the quantity of image element circuit, it is necessary to It is designed according to practical application.

Embodiment three

The preferred embodiment of the present invention three provides a kind of display device, and the display device includes display panel, wherein, display Panel is using the display panel as described in embodiment two.

It should be strongly noted that " coupling " described in the embodiment of the present invention refer to it is electrical between two components Connection, including be directly electrically connected with and be indirectly electrically connected with.

Obviously, above-described embodiment is only used for the statement present invention in detail, does not constitute limiting the scope of the invention. Under design of the invention, any no creative work of one of ordinary skill in the art and the various changes that carry out and modification, Belong to the protection domain of the claims in the present invention.

Claims (13)

1. a kind of image element circuit, it is characterised in that including:The first transistor, transistor seconds, third transistor, the 4th crystal Pipe, the 5th transistor and driving transistor, the first electric capacity, the second electric capacity and light-emitting component, wherein,
The driving transistor is used to determine the size of driving current, and the size of the driving current is by the driving transistor The voltage difference of grid and source electrode is determined;
The first transistor is controlled by the first drive signal, the grid for transmitting reference voltage signal to the driving transistor Pole;
The transistor seconds is controlled by the second drive signal, for transmitting power supply voltage signal to the source of the driving transistor Pole;
The third transistor is controlled by the 3rd drive signal, for controlling the grid of the driving transistor and leading to for drain electrode It is disconnected;
4th transistor is controlled by the 3rd drive signal, for transmitting data-signal to the first pole of second electric capacity Plate, the second pole plate of second electric capacity is connected to the drain electrode of the driving transistor;
5th transistor by fourth drive signal control, for by the driving current from the driving transistor transmit to The light-emitting component;
First electric capacity be used for keep the driving transistor grid and source electrode voltage difference it is constant;
The negative electrode of the light-emitting component is coupled to negative electrode low potential, and is lighted in response to the driving current;
Wherein, the course of work of the image element circuit includes threshold value crawl step and data write step, in threshold value crawl Step, first drive signal controls the first transistor to close, and the 3rd drive signal controls the 3rd crystal Pipe and the 4th transistor are opened, and the 4th transistor transmits the first pole plate of data-signal to the second electric capacity, and the driving is brilliant Body pipe is turned on, until the grid and drain voltage of the driving transistor are the threshold that supply voltage subtracts the driving transistor End during threshold voltage, first electric capacity and the second electric capacity are stored with the threshold voltage;In the data write step, institute Stating the second drive signal controls the transistor seconds to close, and the 3rd drive signal controls the third transistor and described 4th transistor is opened, and the 4th transistor transmits the first pole plate of the data-signal to second electric capacity, by institute State the second Capacitance Coupled so that the drain electrode of the data signal transmission to the driving transistor.
2. image element circuit according to claim 1, it is characterised in that the first electrode of the first transistor is coupled and is used for The reference voltage signal input of reference voltage signal is received, second electrode couples the grid of the driving transistor;
The first electrode of the transistor seconds couples the power supply voltage signal input for receiving power supply voltage signal, second Electrode couples the source electrode of the driving transistor;
The third transistor is coupled to grid and the drain electrode two ends of the driving transistor;
The first electrode of the 4th transistor couples the data signal input for receiving data-signal, second electrode coupling First pole plate of second electric capacity;
The first electrode of the 5th transistor couples the drain electrode of the driving transistor, and second electrode couples the light-emitting component Anode;
First electric capacity is coupled between the power supply voltage signal input and the grid of the driving transistor.
3. image element circuit according to claim 1 and 2, it is characterised in that the driving transistor is P-type transistor.
4. image element circuit according to claim 3, it is characterised in that the reference voltage signal is low level.
5. image element circuit according to claim 3, it is characterised in that the first transistor, transistor seconds, the 3rd brilliant Body pipe, the 4th transistor and the 5th transistor are P-type transistor;Or,
The first transistor, transistor seconds, third transistor, the 4th transistor and the 5th transistor are N-type transistor.
6. a kind of driving method, it is characterised in that for driving image element circuit, the image element circuit includes the first transistor, the Two-transistor, third transistor, the 4th transistor, the 5th transistor and driving transistor, the first electric capacity, the second electric capacity and luminous Element, the first transistor is controlled by the first drive signal, and first electrode couples the reference for receiving reference voltage signal Voltage signal inputs, second electrode couples the grid of the driving transistor;
The transistor seconds is controlled by the second drive signal, and first electrode couples the power supply electricity for receiving power supply voltage signal Pressure signal input part, second electrode couples the source electrode of the driving transistor;
The third transistor is controlled by the 3rd drive signal, and first electrode and second electrode are respectively coupled to the driving crystal The grid of pipe and drain electrode;
4th transistor is controlled by the 3rd drive signal, and first electrode couples defeated for receiving the data-signal of data-signal Enter end, second electrode couples the drain electrode of the driving transistor by second electric capacity;
By fourth drive signal control, first electrode couples the drain electrode of the driving transistor, the second electricity to 5th transistor Pole couples the anode of the light-emitting component;
First electric capacity is coupled between the power supply voltage signal input and the grid of the driving transistor;
The negative electrode of the light-emitting component is coupled to negative electrode low potential;
The driving method includes node reset step, threshold value crawl step, data write step and light emitting step, wherein,
In the node reset step, first drive signal controls the first transistor to open, and transmits described with reference to electricity Signal to the grid of the driving transistor is pressed, to initialize driving transistor grid, the second drive signal control is described Transistor seconds is opened, and transmits the source electrode of the power supply voltage signal to the driving transistor, and other transistors are closed;
In the threshold value crawl step, first drive signal controls the first transistor to close, and the described 3rd drives letter Number control third transistor and the 4th transistor are opened, and the 4th transistor transmits data-signal to the of the second electric capacity One pole plate, the driving transistor conducting, until the grid and drain voltage are supply voltage and subtract the driving crystal End during the threshold voltage of pipe, first electric capacity and the second electric capacity are stored with the threshold voltage;
In the data write step, second drive signal controls the transistor seconds to close, and the described 3rd drives letter Number control third transistor and the 4th transistor are opened, and the 4th transistor transmits the data-signal to described second First pole plate of electric capacity, by second Capacitance Coupled so that the leakage of the data signal transmission to the driving transistor Pole;
In the light emitting step, second drive signal controls the transistor seconds to open, the fourth drive signal control Make the 5th transistor to open, the driving transistor produces driving current, to drive the light-emitting component to light.
7. driving method according to claim 6, it is characterised in that in the node reset step, when described first brilliant Body pipe, transistor seconds, third transistor, the 4th transistor, the 5th transistor and the driving transistor are P-type crystal Pipe, first drive signal, the second drive signal are low level, and the 3rd drive signal, fourth drive signal are electricity high It is flat;
When the first transistor, transistor seconds, third transistor, the 4th transistor and the 5th transistor are N-type crystal Pipe, the driving transistor is P-type transistor, and first drive signal, the second drive signal are high level, and the described 3rd drives Dynamic signal, fourth drive signal are low level.
8. driving method according to claim 6, it is characterised in that in the threshold value crawl step, when described first brilliant Body pipe, transistor seconds, third transistor, the 4th transistor, the 5th transistor and the driving transistor are P-type crystal Pipe, first drive signal, fourth drive signal are high level, and second drive signal, the 3rd drive signal are low electricity Flat, the data-signal of the data signal input input is equal to reference voltage signal;
When the first transistor, transistor seconds, third transistor, the 4th transistor and the 5th transistor are N-type crystal Pipe, the driving transistor is P-type transistor, and first drive signal, fourth drive signal are low level, and described second drives Dynamic signal, the 3rd drive signal are high level, and the data-signal of the data signal input input is equal to reference voltage signal.
9. driving method according to claim 6, it is characterised in that in the data write step, when described first brilliant Body pipe, transistor seconds, third transistor, the 4th transistor, the 5th transistor and the driving transistor are P-type crystal Pipe, first drive signal, the second drive signal, fourth drive signal are high level, and the 3rd drive signal is low electricity Flat, the data signal input is input into effective display data signal;
When the first transistor, transistor seconds, third transistor, the 4th transistor and the 5th transistor are N-type crystal Pipe, the driving transistor is P-type transistor, and first drive signal, the second drive signal, fourth drive signal are low electricity Flat, the 3rd drive signal is high level, and the data signal input is input into effective display data signal.
10. driving method according to claim 9, it is characterised in that the effective display data signal is less than reference Voltage signal.
11. driving methods according to claim 6, it is characterised in that in the light emitting step, when the first crystal Pipe, transistor seconds, third transistor, the 4th transistor, the 5th transistor and the driving transistor are P-type transistor, First drive signal, the 3rd drive signal are high level, and second drive signal, fourth drive signal are low level;
When the first transistor, transistor seconds, third transistor, the 4th transistor and the 5th transistor are N-type crystal Pipe, the driving transistor is P-type transistor, and first drive signal, the 3rd drive signal are low level, and described second drives Dynamic signal, fourth drive signal are high level.
12. a kind of display panels, it is characterised in that including the image element circuit described in Claims 1 to 5 any one.
13. a kind of display devices, it is characterised in that including the display panel described in claim 12.
CN201410734455.6A 2014-12-04 2014-12-04 Image element circuit and its driving method, display panel, display device CN104409042B (en)

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