CN104809983B - Pixel unit drive circuit, driving method and pixel cell - Google Patents
Pixel unit drive circuit, driving method and pixel cell Download PDFInfo
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- CN104809983B CN104809983B CN201510229135.XA CN201510229135A CN104809983B CN 104809983 B CN104809983 B CN 104809983B CN 201510229135 A CN201510229135 A CN 201510229135A CN 104809983 B CN104809983 B CN 104809983B
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Abstract
The present invention provides a kind of pixel unit drive circuit, for driving organic electroluminescence device, including first film transistor, second thin film transistor (TFT), 3rd thin film transistor (TFT) and storage capacitance, the first film transistor is used for the on or off under the control of one first scanning signal, and charged to the storage capacitance by a data-signal in conducting, second thin film transistor (TFT) is used to be turned in the presence of the storage capacitance and drives an organic light-emitting diode, 3rd thin film transistor (TFT) is used for when the first film transistor is ended, turned under the control of one second scanning signal, and charged to the storage capacitance by a charging signals.The pixel unit drive circuit can effectively prevent from causing splashette because of storage capacitance charge leakage.The present invention also provides a kind of pixel cell and a kind of pixel cell driving method.
Description
Technical field
The present invention relates to technical field of liquid crystal display, more particularly to a kind of pixel unit drive circuit, a kind of driving method
And a kind of pixel cell.
Background technology
Organic Light Emitting Diode (Organic Light-Emitting Diode, OLED) display screen, also referred to as Organic Electricity
Photoluminescence display screen, is a kind of emerging flat-panel display device.OLED display screen has preparation process is simple, low cost, power consumption
Low, luminosity is high, operating temperature range is wide, volume is frivolous, fast response time the features such as, and be easily achieved colored display, big
Screen display, Flexible Displays and match with driver ic, thus be widely used in flat display field.
Pixel cell in OLED display screen is typically arranged in a matrix fashion, and OLED is according to the difference of type of drive,
Passive matrix OLED (Passive-Matrix OLED, PM-OLED) can be divided into and drive display screen and Activematric OLED
(Active-Matrix OLED, AM-OLED) drives two kinds of display screen.Wherein, although PM-OLED drives the letter of display screen technique
Single, cost is relatively low, but the shortcomings of because there is cross-talk, high power consumption, low life-span, it is impossible to meet high-resolution, large scale and show
The need for.By contrast, AM-OLED drives display screen that one group is integrated with each pixel cell by thin film transistor (TFT)
The pixel unit drive circuit of (Thin Film Transistor, TFT) and storage capacitance composition, by the conducting to TFT or
The control of cut-off, is capable of achieving the control to the electric current by OLED, so as to control the OLED to light.Because drive circuit is added
TFT and storage capacitance so that the OLED in each pixel cell can light in a controllable frame time, and required
Driving current is small, low in energy consumption, and the life-span is longer, can meet the need for high-resolution, many gray scales, large scale show.
Fig. 1 show a pixel unit drive circuit in OLED display screen in the prior art.Wherein, T1 is thin to switch
Film transistor, T2 is driving thin film transistor (TFT), CsIt is storage capacitance, scan line is used to provide scanning signal, and data wire is used to carry
For data-signal.When the scanning signal that scan line is provided is in high level, the grid g1 of switching thin-film transistor T1 is applied in
Upper certain voltage, and then switching thin-film transistor T1 is entered conducting state, the source electrode s1 of switching thin-film transistor T1 and leakage
Pressure difference between the d1 of pole drops to a small value, and now switching thin-film transistor T1 can approximately regard short-circuit condition as.Data
The data-signal that line is provided is stored into storage capacitance C by switching thin-film transistor T1sOn, as storage capacitance CsCharge.Film
Transistor T2 is connected to storage capacitance CsOne end, as storage capacitance CsThe voltage of one end reaches and drives thin film transistor (TFT) T2's
During cut-in voltage, thin film transistor (TFT) T2 conductings are driven, and drive OLED to light.When the scanning signal that scan line is provided is in low electricity
Usually, then switching thin-film transistor T1 is in cut-off state, however, because switching thin-film transistor T1 has leakage current, then depositing
Storing up electricity holds CsOn electric charge can switching thin-film transistor T1 be in cut-off state when leak to institute along switching thin-film transistor T1
Data wire is stated, causes storage capacitance CsVoltage is gradually reduced, that is, there is leaping voltage (such as Fig. 2), so that the driving is thin
The voltage of the grid g2 of film transistor T2 significantly declines when the switching thin-film transistor T1 is in cut-off state, Jin Eryin
Play OLED display screen flicker.
The content of the invention
The present invention provides a kind of pixel unit drive circuit, by increasing by a charging signals, and for brilliant in switch film
Body pipe charges during ending to storage capacitance, causes to dodge to prevent from causing because of charge leakage storage capacitance voltage instability
Screen.
Separately, the present invention also provides a kind of pixel cell of the application pixel unit drive circuit, by increasing by a charging wire
The charging signals are provided, and for being charged to storage capacitance during switching thin-film transistor ends, to prevent because of electricity
Lotus is revealed and causes storage capacitance voltage instability and cause splashette, lifts the stability of pixel cell.
Separately, the present invention also provides a kind of pixel cell driving method of the application pixel unit drive circuit, by providing
The charging signals, and for being charged to storage capacitance during switching thin-film transistor ends, to prevent from being let out because of electric charge
Reveal and cause storage capacitance voltage instability and cause splashette, lift display quality.
A kind of pixel unit drive circuit, for driving organic electroluminescence device, the pixel unit drive circuit bag
First film transistor, the second thin film transistor (TFT), the 3rd thin film transistor (TFT) and storage capacitance are included, the first film transistor is used
In on or off under the control in one first scanning signal, and filled to the storage capacitance by a data-signal in conducting
Electricity, second thin film transistor (TFT) is used to be turned in the presence of the storage capacitance and drives an Organic Light Emitting Diode
(Organic Light-Emitting Diode, OLED) lights, and the 3rd thin film transistor (TFT) is used in the first film
During transistor cutoff, turned under the control of one second scanning signal, and charged to the storage capacitance by a charging signals.
Wherein, the first film transistor includes first grid, the first source electrode and the first drain electrode, and second film is brilliant
Body pipe include second grid, the second source electrode and second drain electrode, the 3rd thin film transistor (TFT) include the 3rd grid, the 3rd source electrode and
3rd drain electrode, the first grid is used to receive first scanning signal, and first source electrode is used to receive the data letter
Number, first drain electrode is connected with one end of the second grid, the 3rd drain electrode and the storage capacitance, the storage electricity
The other end of appearance is connected with the described second drain electrode, and second source electrode is connected with one end of the OLED, and the OLED's is another
End ground connection, the 3rd drain electrode is connected with one end of the second grid and the storage capacitance, and the 3rd grid is used to connect
Second scanning signal is received, the 3rd source electrode is used to receive the charging signals.
Wherein, the pixel unit drive circuit also includes a power supply, and the power supply is connected with the described second drain electrode, is used for
For the pixel unit drive circuit provides driving voltage.
A kind of pixel cell, including the first scan line, the second scan line, data wire, charging wire and the pixel cell drive
Dynamic circuit, first scan line is used to provide the first scanning signal, and second scan line is used to provide the second scanning signal,
The data wire is used to provide data-signal, and the charging wire is used to providing charging signals, second scanning signal relative to
First scanning signal had for one first time delay, and the charging signals have one second to prolong relative to the data-signal
The slow time.
Wherein, first scanning signal and the data-signal synchronizing signal each other, second scanning signal and institute
State charging signals synchronizing signal each other, and first scanning signal, the second scanning signal, data-signal and charging signals week
Phase is a frame period of the pixel cell.
Wherein, first time delay is equal to second time delay, and first time delay and second prolongs
The slow time was respectively less than or equal to 3/4 frame period of the pixel cell.
A kind of pixel cell driving method, including：
First scanning signal, the second scanning signal, data-signal and charging signals are provided；
First film transistor is turned in the presence of first scanning signal, so that the data-signal is by described
First film transistor charges to storage capacitance；
When the voltage that the storage capacitance is connected to second grid one end of the second thin film transistor (TFT), to reach described second thin
During the cut-in voltage of film transistor, the second thin film transistor (TFT) conducting, to drive an Organic Light Emitting Diode (Organic
Light-Emitting Diode, OLED) it is luminous；
The first film transistor is ended in the presence of first scanning signal, and the storage capacitance continues to tie up
The second thin film transistor (TFT) conducting is held, to drive the OLED to light；
After the first film transistor ends a scheduled time, the 3rd thin film transistor (TFT) is in second scanning signal
In the presence of turn on, and the charging signals is charged to the storage capacitance by the 3rd thin film transistor (TFT).
Wherein, first scanning signal and the data-signal synchronizing signal each other, second scanning signal and institute
Charging signals synchronizing signal each other is stated, when second scanning signal has one first to postpone relative to first scanning signal
Between, the charging signals had for one second time delay relative to the data-signal, and first scanning signal, second swept
The cycle for retouching signal, data-signal and charging signals is a frame period of the pixel cell.
Wherein, first time delay is equal to second time delay, and first time delay and second prolongs
The slow time was respectively less than or equal to 3/4 frame period of the pixel cell.
Wherein, the scheduled time is equal to first time delay or the second time delay.
Pixel unit drive circuit of the present invention, 3/4 frame week is delayed by providing one relative to data-signal
The charging signals of phase, and second scanning signal in 3/4 frame period relative to first scanning signal delay is provided comes
The 3rd thin film transistor (TFT) on or off is controlled, when the first film transistor is ended, to be scanned by described second
Signal controls the 3rd thin film transistor (TFT) conducting, so that the charging signals are described by the 3rd thin film transistor (TFT)
Storage capacitance charges, with during preventing the first film transistor from ending, because of charge leakage so that the storage capacitance voltage
It is unstable and cause splashette.
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
Some embodiments of invention, for those of ordinary skill in the art, on the premise of not paying creative work, can be with
Other accompanying drawings are obtained according to these accompanying drawings.
Fig. 1 is a pixel unit drive circuit schematic diagram of OLED display screen in the prior art.
Fig. 2 is voltage jump schematic diagram of the storage capacitance of pixel unit drive circuit shown in Fig. 1 within a frame period.
Fig. 3 is the pixel unit drive circuit structural representation of first embodiment of the invention.
Fig. 4 is the first scanning signal of pixel unit drive circuit shown in Fig. 3 and the relation schematic diagram of the second scanning signal.
Fig. 5 is the data-signal of pixel unit drive circuit shown in Fig. 3 and the relation schematic diagram of charging signals.
Fig. 6 is the structural representation of the pixel cell of second embodiment of the invention.
Fig. 7 is the schematic flow sheet of the pixel cell driving method of third embodiment of the invention.
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.
Fig. 3 is referred to, first embodiment of the invention provides a kind of pixel unit drive circuit 30, for driving organic electroluminescence
Luminescent device, it includes power supply VDD, first film transistor (Thin Film Transistor, TFT) T1, the second film crystal
Pipe T2, the 3rd thin film transistor (TFT) T3 and storage capacitance Cs.The first film transistor T1 is switch TFT, for one first
Scanning signal Vs1Control under on or off, and conducting when pass through a data-signal VdataTo the storage capacitance CsFill
Electricity.The second thin film transistor (TFT) T2 is driving TFT, in the storage capacitance CsIn the presence of turn on and drive one organic
Light emitting diode (Organic Light-Emitting Diode, OLED) lights.The 3rd thin film transistor (TFT) T3 is used for
One second scanning signal Vs2Control under on or off, and conducting when pass through a charging signals VcTo the storage capacitance Cs
Charge.The power vd D is used to provide driving voltage for the pixel unit drive circuit 30.
The first film transistor T1 includes first grid g1, the first source electrode s1 and the first drain electrode d1.Described second is thin
Film transistor T2 includes second grid g2, the second source electrode s2 and the second drain electrode d2.The 3rd thin film transistor (TFT) T3 includes the 3rd
Grid g3, the 3rd source electrode s3 and the 3rd drain electrode d3.The first grid g1 is used to receive the first scanning signal Vs1.Described
One source electrode s1 is used to receive the data-signal Vdata.It is described first drain electrode the d1 and second grid g2, the 3rd drain electrode d3 and
The storage capacitance CsOne end connection, the storage capacitance CsThe other end and the power supply VDDAnd the second drain electrode d2 connects
Connect, i.e. storage capacitance CsIt is connected between the drain electrodes of the second grid g2 and second d2.The second source electrode s2 with it is described
One end connection of OLED, the other end ground connection of the OLED.3rd drain electrode d3 and the second grid g2 and the storage
Electric capacity CsOne end connection, the 3rd grid g3 be used for receive the second scanning signal Vs2.The 3rd source electrode s3 is used for
Receive the charging signals Vc。
Refer to Fig. 4, the first scanning signal Vs1With the second scanning signal Vs2It is the cycle with same waveform
Signal, and the second scanning signal Vs2Relative to the first scanning signal Vs1With one first time delay.In this implementation
In example, the first scanning signal Vs1With the second scanning signal Vs2Cycle be a frame period, and with identical peak value
V1, first time delay was 3/4 frame period.It is appreciated that first time delay was also less than for 3/4 frame period,
Such as, 2/3 frame period, 3/5 frame period, 1/2 frame period etc..
Refer to Fig. 5, the data-signal VdataWith the charging signals VcIt is the periodic signal with same waveform, and
The charging signals VcRelative to the data-signal VdataWith one second time delay.In the present embodiment, the data letter
Number VdataWith charging signals VcCycle be a frame period, and with identical peak value V2, second time delay is 3/
4 frame periods.It is appreciated that second time delay was also less than for 3/4 frame period, e.g., 2/3 frame period, 3/5 frame period,
1/2 frame period etc..
In the present embodiment, the first scanning signal Vs1With the data-signal VdataSynchronizing signal, described each other
Two scanning signal Vs2With the charging signals VcSynchronizing signal each other.That is, described first time delay is equal to described second and postpones
Time, and the two may be configured as less than or equal to 3/4 frame period.
The operation principle of the pixel unit drive circuit 30 is further illustrated with reference to Fig. 3 to Fig. 5, this sentences described
First time delay be 3/4 frame period, the second time delay be 3/4 frame period as a example by be illustrated.
As the first scanning signal Vs1During for high level, the first film transistor T1 is in the first scanning signal Vs1
In the presence of turn on, the data-signal VdataBy the first film transistor T1 to the storage capacitance CsCharged.
The 3rd thin film transistor (TFT) T3 is in the second scanning signal Vs2In the presence of end.As the storage capacitance CsIt is connected to institute
When the voltage for stating second grid g2 one end reaches the cut-in voltage of the second thin film transistor (TFT) T2, then second thin film transistor (TFT)
T2 is turned on, and then drives the OLED to light.
As the first scanning signal Vs1During for low level, the first film transistor T1 is in first scanning signal
Vs1In the presence of end.The second thin film transistor (TFT) T2 is in storage capacitance CsIn the presence of turn on, and then drive the OLED
It is luminous.Because there is leakage current, the storage capacitance C in the first film transistor T1sOn electric charge can first scanning letter
Number Vs1To leak to the data wire along first film transistor T1 between low period, cause the storage capacitance CsVoltage by
Gradually decline.To prevent because of the storage capacitance CsVoltage decline it is excessive and cause OLED to flash, when the first film crystal
After pipe T1 ends a scheduled time, the 3rd thin film transistor (TFT) T3 is in the second scanning signal Vs2In the presence of turn on, make
Obtain the charging signals VcBy the 3rd thin film transistor (TFT) T3 to the storage capacitance CsCharged, so as to ensure described
Storage capacitance CsEnough voltage can be provided to drive the OLED continually and steadily to light, and last till the first scanning letter
Number Vs1It is changed into high level, and then repeats said process.Wherein, 3/4 frame of the scheduled time less than or equal to pixel cell
Cycle.
The pixel unit drive circuit 30 is by providing one relative to data-signal VdataDelayed for 3/4 frame period
Charging signals Vc, and one is provided relative to the first scanning signal Vs1Delay the second scanning signal V in 3/4 frame periods2
To control the 3rd thin film transistor (TFT) T3 on or off, with the first scanning signal Vs1During for low level, by described
Second scanning signal Vs2The 3rd thin film transistor (TFT) T3 is controlled to turn on, so that the charging signals VcIt is thin by the described 3rd
Film transistor T3 is the storage capacitance CsCharge, during preventing the first film transistor T1 to be in cut-off state, because of electricity
Lotus is revealed and causes the storage capacitance CsVoltage instability and cause splashette.
Fig. 6 is referred to, second embodiment of the invention provides a kind of pixel list of the above-mentioned pixel unit drive circuit 30 of application
Unit 60.The pixel cell 60 includes the first scan line 61, the second scan line 63, data wire 65, charging wire 67, power supply VDD,
One thin film transistor (TFT) (Thin Film Transistor, TFT) T1, the second thin film transistor (TFT) T2, the 3rd thin film transistor (TFT) T3, deposit
Storing up electricity holds CsAnd Organic Light Emitting Diode (Organic Light-Emitting Diode, OLED).First scan line 61
For providing the first scanning signal Vs1.Second scan line 63 is used to provide the second scanning signal Vs2.The data wire 65 is used
In offer data-signal Vdata.The charging wire 67 is used to provide charging signals Vc.The power supply VDDFor being the pixel cell
60 provide driving voltage.The first film transistor T1 is switch TFT, and it is connected with the first scan line 61 and data wire 65,
For in the first scanning signal Vs1Control under on or off, and conducting when cause the data-signal VdataPass through
First film transistor T1 gives the storage capacitance CsCharge.The second thin film transistor (TFT) T2 for drive TFT, its with it is described
First film transistor T1, power supply VDDAnd storage capacitance CsConnection, in the storage capacitance CsIn the presence of turn on and drive
The OLED is moved to light.The 3rd thin film transistor (TFT) T3 and first film transistor T1, the second thin film transistor (TFT) T2, fill
Electric wire 67 and second scan line 63 are connected, in the second scanning signal Vs2Control under on or off, and
The charging signals V is caused during conductingcThe storage capacitance C is given by the 3rd thin film transistor (TFT) T3sCharge.
The first film transistor T1 includes first grid g1, the first source electrode s1 and the first drain electrode d1.Described second is thin
Film transistor T2 includes second grid g2, the second source electrode s2 and the second drain electrode d2.The 3rd thin film transistor (TFT) T3 includes the 3rd
Grid g3, the 3rd source electrode s3 and the 3rd drain electrode d3.The first grid g1 connects first scan line 61.First source electrode
S1 connects the data wire 65.The first drain electrode d1 and second grid g2, the 3rd drain electrode d3 and storage capacitance Cs
One end connection, the storage capacitance CsThe other end and the power supply VDDAnd the second drain electrode d2 connections, i.e. storage electricity
Hold CsIt is connected between the second drain electrode d2 and second grid g2.The second source electrode s2 is used to connect the one of the OLED
End, the other end ground connection of the OLED.The 3rd drain electrode d3 and second grid g2 and storage capacitance CsOne end
Connection, the 3rd grid g3 connects second scan line 63, and the 3rd source electrode s3 connects the charging wire 67.
Wherein, the first scanning signal Vs1With the second scanning signal Vs2It is the periodic signal with same waveform,
And the second scanning signal Vs2Relative to the first scanning signal Vs1With one first time delay.In the present embodiment,
The first scanning signal Vs1With the second scanning signal Vs2Cycle be frame period of the pixel cell 60, and tool
There is identical peak value V1, first time delay was 3/4 frame period.It is appreciated that first time delay can be with small
In 3/4 frame period, e.g., 2/3 frame period, 3/5 frame period, 1/2 frame period etc..
Wherein, the data-signal VdataWith the charging signals VcIt is the periodic signal with same waveform, and described fills
Electric signal VcRelative to the data-signal VdataWith one second time delay.In the present embodiment, the data-signal Vdata
With charging signals VcCycle be frame period of the pixel cell 60, and with identical peak value V2, described second prolongs
The slow time was 3/4 frame period.It is appreciated that second time delay was also less than for 3/4 frame period, e.g., 2/3 frame period,
3/5 frame period, 1/2 frame period etc..
In the present embodiment, the first scanning signal Vs1With the data-signal VdataSynchronizing signal, described each other
Two scanning signal Vs2With the charging signals VcSynchronizing signal each other, i.e. first time delay is equal to described second and postpones
Time, and the two may be configured as less than or equal to 3/4 frame period.
The operation principle of the pixel cell 60 is further illustrated below, this sentences first time delay for 3/4 frame
Cycle, the second time delay be 3/4 frame period as a example by be illustrated.
As the first scanning signal Vs1During for high level, first film transistor T1 is in the first scanning signal Vs1Work
Use lower conducting, the data-signal VdataBy the first film transistor T1 to the storage capacitance CsCharged.3rd
Thin film transistor (TFT) T3 is in the second scanning signal Vs2In the presence of end.As the storage capacitance CsIt is connected to the second grid g2
When the voltage of one end reaches the cut-in voltage of the second thin film transistor (TFT) T2, the second thin film transistor (TFT) T2 conductings, and then drive
The OLED lights.
As the first scanning signal Vs1During for low level, first film transistor T1 is in the first scanning signal Vs1Work
Use lower cut-off.Second thin film transistor (TFT) T2 is in storage capacitance CsIn the presence of turn on, and then drive the OLED to light.Due to
There is leakage current, storage capacitance C in one thin film transistor (TFT) T1sOn electric charge can be in the first scanning signal Vs1For between low period along
One thin film transistor (TFT) T1 leaks to the data wire 65, causes storage capacitance CsVoltage is gradually reduced.To prevent because of the storage
Electric capacity CsVoltage decline it is excessive and cause OLED to flash, after the first film transistor T1 ends a scheduled time, institute
The 3rd thin film transistor (TFT) T3 is stated in the second scanning signal Vs2In the presence of turn on so that the charging signals VcBy described
3rd thin film transistor (TFT) T3 is to the storage capacitance CsCharged, so as to ensure the storage capacitance CsCan provide enough
Voltage lasts till the first scanning signal V to drive the OLED continually and steadily to lights1It is changed into high level, and then repeats
Said process.Wherein, 3/4 frame period of the scheduled time less than or equal to pixel cell.
The pixel cell 60 provides charging signals V by increasing the charging wire 67c, and by the charging signals VcIf
It is set to the data-signal V for postponing for 3/4 frame perioddata, and by providing one relative to the first scanning signal Vs1Delay
The second scanning signal V in 3/4 frame periods2To control the 3rd thin film transistor (TFT) T3 on or off, swept with described first
Retouch signal Vs1During for low level, by the second scanning signal Vs2The 3rd thin film transistor (TFT) T3 is controlled to turn on, so that institute
State charging signals VcIt is the storage capacitance C by the thin film transistor (TFT) T3sCharge, to prevent the first film transistor
When T1 is in cut-off state, because of charge leakage so that the storage capacitance CsVoltage instability and cause splashette.
Also referring to Fig. 6 and Fig. 7, third embodiment of the invention provides a kind of above-mentioned pixel unit drive circuit 30 of application
Pixel cell driving method.The pixel cell driving method is at least comprised the following steps.
Step S1：First scanning signal V is provideds1, the second scanning signal Vs2, data-signal VdataAnd charging signals Vc。
Specifically, the first scanning signal Vs1There is provided by the first scan line 61, the second scanning signal Vs2By second
Scan line 63 is provided, the data-signal VdataThere is provided by data wire 65, the charging signals VcThere is provided by charging wire 67.
Wherein, the first scanning signal Vs1With the second scanning signal Vs2It is the periodic signal with same waveform,
And the second scanning signal Vs2Relative to the first scanning signal Vs1With one first time delay.In the present embodiment,
The first scanning signal Vs1With the second scanning signal Vs2Cycle be a frame period, and with identical peak value V1, institute
Stated for the first time delay for 3/4 frame period.It is appreciated that first time delay is also less than 3/4 frame period, e.g., 2/3
Frame period, 3/5 frame period, 1/2 frame period etc..
Wherein, the data-signal VdataWith the charging signals VcIt is the periodic signal with same waveform, and described fills
Electric signal VcRelative to the data-signal VdataWith one second time delay.In the present embodiment, the data-signal Vdata
With charging signals VcCycle be a frame period, and with identical peak value V2, second time delay is 3/4 frame week
Phase.It is appreciated that second time delay was also less than for 3/4 frame period, and e.g., 2/3 frame period, 3/5 frame period, 1/2 frame
Cycle etc..
In the present embodiment, the first scanning signal Vs1With the data-signal VdataSynchronizing signal, described each other
Two scanning signal Vs2With the charging signals VcSynchronizing signal each other, i.e. first time delay is equal to described second and postpones
Time, and the two may be configured as less than or equal to 3/4 frame period.
Step S2：First film transistor T1 is in the first scanning signal Vs1In the presence of turn on so that the data
Signal VdataBy the first film transistor T1 to storage capacitance CsCharge.
Specifically, as the first scanning signal Vs1During for high level, the first film transistor T1 is in the first scanning
Signal Vs1In the presence of turn on, meanwhile, the 3rd thin film transistor (TFT) T3 is in the second scanning signal Vs2In the presence of end.Institute
State data-signal VdataBy the first film transistor T1 to the storage capacitance CsCharged.
Step S3：As the storage capacitance CsThe voltage for being connected to second grid g2 one end of the second thin film transistor (TFT) T2 reaches
To the second thin film transistor (TFT) T2 cut-in voltage when, the second thin film transistor (TFT) T2 conducting, to drive OLED to light.
Step S4：The first film transistor T1 is in the first scanning signal Vs1In the presence of end, and described deposit
Storing up electricity holds CsThe second thin film transistor (TFT) T2 conductings are continued to, to drive the OLED to light.
Specifically, as the first scanning signal Vs1During for low level, the first film transistor T1 is described first
Scanning signal Vs1In the presence of end.The second thin film transistor (TFT) T2 is in storage capacitance CsIn the presence of turn on, and then drive
The OLED lights.Because there is leakage current, the storage capacitance C in first film transistor T1sOn electric charge can be swept first
Retouch signal Vs1To leak to the data wire 65 along first film transistor T1 between low period, cause storage capacitance CsVoltage by
Gradually decline.
Step S5：After the first film transistor T1 ends a scheduled time, the 3rd thin film transistor (TFT) T3 is described
Second scanning signal Vs2In the presence of turn on, and make the charging signals VcDeposited to described by the 3rd thin film transistor (TFT) T3
Storing up electricity holds CsCharge.Wherein, 3/4 frame period of the scheduled time less than or equal to pixel cell.
Specifically, to prevent because of the storage capacitance CsVoltage decline it is excessive and cause OLED to flash, when described first
After thin film transistor (TFT) T1 ends the scheduled time, the 3rd thin film transistor (TFT) T3 is in the second scanning signal Vs2Effect
Lower conducting so that the charging signals VcBy the 3rd thin film transistor (TFT) T3 to the storage capacitance CsCharged, so that
Ensure the storage capacitance CsEnough voltage can be provided to drive the OLED continually and steadily to light, and last till described
Scan signal Vs1It is changed into high level, and then the S1-S5 that repeats the above steps.
Above disclosed is only presently preferred embodiments of the present invention, can not limit the right of the present invention with this certainly
Scope, one of ordinary skill in the art will appreciate that all or part of flow of above-described embodiment is realized, and according to right of the present invention
It is required that the equivalent variations made, still fall within the covered scope of invention.
Claims (10)
1. a kind of pixel unit drive circuit, for driving organic electroluminescence device, it is characterised in that the pixel cell drives
Dynamic circuit includes first film transistor, the second thin film transistor (TFT), the 3rd thin film transistor (TFT) and storage capacitance, the first film
Transistor is used for the on or off under the control of one first scanning signal, and is deposited to described by a data-signal in conducting
Storing up electricity capacity charge, second thin film transistor (TFT) is used to be turned in the presence of the storage capacitance and drives an organic light emission two
Pole pipe (Organic Light-Emitting Diode, OLED) lights, and the 3rd thin film transistor (TFT) is used for described first
When thin film transistor (TFT) ends, turned under the control of one second scanning signal, and the storage capacitance is given by a charging signals
Charge, first scanning signal and second scanning signal are the periodic signal with same waveform, and described second sweeps
Retouch signal had for one first time delay relative to first scanning signal, and the charging signals are tool with the data-signal
There is the periodic signal of same waveform, and the charging signals had for one second time delay relative to the data-signal.
2. pixel unit drive circuit as claimed in claim 1, it is characterised in that the first film transistor includes first
Grid, the first source electrode and the first drain electrode, second thin film transistor (TFT) include second grid, the second source electrode and the second drain electrode, institute
Stating the 3rd thin film transistor (TFT) includes the 3rd grid, the 3rd source electrode and the 3rd drain electrode, and the first grid is used to receive described first
Scanning signal, first source electrode is used to receive the data-signal, first drain electrode and the second grid, the described 3rd
One end connection of drain electrode and the storage capacitance, the other end of the storage capacitance is connected with the described second drain electrode, and described second
Source electrode is connected with one end of the OLED, the other end ground connection of the OLED, and the described 3rd drains and the second grid and institute
One end connection of storage capacitance is stated, the 3rd grid is used to receive second scanning signal, and the 3rd source electrode is used to connect
Receive the charging signals.
3. pixel unit drive circuit as claimed in claim 2, it is characterised in that the pixel unit drive circuit also includes
One power supply, the power supply is connected with the described second drain electrode, for providing driving voltage for the pixel unit drive circuit.
4. a kind of pixel cell, including the first scan line and data wire, it is characterised in that the pixel cell is also swept including second
Line, charging wire and the pixel unit drive circuit as described in claim 1-3 any one are retouched, first scan line is used to carry
For the first scanning signal, second scan line is used to provide the second scanning signal, and the data wire is used to provide data-signal,
The charging wire is used to provide charging signals.
5. pixel cell as claimed in claim 4, it is characterised in that first scanning signal is with the data-signal each other
Synchronizing signal, second scanning signal and the charging signals synchronizing signal each other, and first scanning signal, second sweep
The cycle for retouching signal, data-signal and charging signals is a frame period of the pixel cell.
6. pixel cell as claimed in claim 5, it is characterised in that when first time delay is equal to described second and postpones
Between, and first time delay and the second time delay be respectively less than or equal to 3/4 frame period of the pixel cell.
7. a kind of pixel cell driving method, it is characterised in that methods described includes：
First scanning signal, the second scanning signal, data-signal and charging signals are provided；First scanning signal and described
Two scanning signals are the periodic signal with same waveform, and second scanning signal has relative to first scanning signal
There is one first time delay, the charging signals and the data-signal are the periodic signal with same waveform, and described fill
Electric signal had for one second time delay relative to the data-signal；
First film transistor is turned in the presence of first scanning signal, so that the data-signal passes through described first
Thin film transistor (TFT) charges to storage capacitance；
When the voltage that the storage capacitance is connected to second grid one end of the second thin film transistor (TFT) reaches the second film crystalline substance
During the cut-in voltage of body pipe, the second thin film transistor (TFT) conducting, to drive an Organic Light Emitting Diode (Organic Light-
Emitting Diode, OLED) it is luminous；
The first film transistor is ended in the presence of first scanning signal, and the storage capacitance continues to institute
The conducting of the second thin film transistor (TFT) is stated, to drive the OLED to light；
After the first film transistor ends a scheduled time, work of the 3rd thin film transistor (TFT) in second scanning signal
Lower conducting is used, and the charging signals is charged to the storage capacitance by the 3rd thin film transistor (TFT).
8. pixel cell driving method as claimed in claim 7, it is characterised in that first scanning signal and the data
Signal synchronizing signal each other, second scanning signal and the charging signals synchronizing signal each other, and the first scanning letter
Number, the cycle of the second scanning signal, data-signal and charging signals be frame period of the pixel cell.
9. pixel cell driving method as claimed in claim 8, it is characterised in that first time delay is equal to described the
Two time delays, and first time delay and the second time delay be respectively less than or equal to 3/4 frame of the pixel cell
Cycle.
10. pixel cell driving method as claimed in claim 9, it is characterised in that the scheduled time is equal to described first
Time delay or the second time delay.
Priority Applications (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510229135.XA CN104809983B (en) | 2015-05-07 | 2015-05-07 | Pixel unit drive circuit, driving method and pixel cell |
| US14/761,344 US9779660B2 (en) | 2015-05-07 | 2015-05-12 | Pixel unit driving circuit, driving method and pixel cell |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201510229135.XA CN104809983B (en) | 2015-05-07 | 2015-05-07 | Pixel unit drive circuit, driving method and pixel cell |
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| CN104809983B true CN104809983B (en) | 2017-07-04 |
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| CN105047139B (en) | 2015-09-22 | 2018-07-13 | 深圳市华星光电技术有限公司 | The digital driving method of OLED display |
| CN105405396B (en) * | 2016-01-11 | 2017-11-10 | 京东方科技集团股份有限公司 | A kind of driving method of Organic Light Emitting Diode, drive circuit and display device |
| JP6722086B2 (en) * | 2016-10-07 | 2020-07-15 | 株式会社ジャパンディスプレイ | Display device |
| CN110047435B (en) * | 2019-04-23 | 2020-12-04 | 京东方科技集团股份有限公司 | Pixel driving circuit, driving method thereof, display panel and display device |
| CN111312183B (en) * | 2019-11-13 | 2021-09-03 | Tcl华星光电技术有限公司 | Display device and driving method thereof |
| CN111653247B (en) * | 2020-06-09 | 2021-06-22 | 武汉华星光电技术有限公司 | Pixel driving circuit and display panel |
| US11257456B2 (en) | 2020-06-09 | 2022-02-22 | Wuhan China Star Optoelectronics Technology Co., Ltd | Pixel driving circuit and display panel |
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| TW558699B (en) * | 2002-08-28 | 2003-10-21 | Au Optronics Corp | Driving circuit and method for light emitting device |
| KR101209055B1 (en) * | 2005-09-30 | 2012-12-06 | 삼성디스플레이 주식회사 | Display device and driving method thereof |
| CN101046937A (en) * | 2006-03-28 | 2007-10-03 | 精工爱普生株式会社 | Electro-optical device, method for driving electro-optical device, and electronic apparatus |
| KR100821055B1 (en) * | 2006-12-27 | 2008-04-08 | 삼성에스디아이 주식회사 | Organic light emitting diodes display device and method of the same |
| CN103236236A (en) * | 2013-04-24 | 2013-08-07 | 京东方科技集团股份有限公司 | Pixel driving circuit, array substrate and display device |
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