CN108281112A - Pixel-driving circuit and its control method, display panel and display device - Google Patents
Pixel-driving circuit and its control method, display panel and display device Download PDFInfo
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- CN108281112A CN108281112A CN201810111279.9A CN201810111279A CN108281112A CN 108281112 A CN108281112 A CN 108281112A CN 201810111279 A CN201810111279 A CN 201810111279A CN 108281112 A CN108281112 A CN 108281112A
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- G—PHYSICS
- G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
- G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
- G09G3/00—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes
- G09G3/20—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters
- G09G3/22—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources
- G09G3/30—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources using electroluminescent panels
- G09G3/32—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources using electroluminescent panels semiconductive, e.g. using light-emitting diodes [LED]
- G09G3/3208—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources using electroluminescent panels semiconductive, e.g. using light-emitting diodes [LED] organic, e.g. using organic light-emitting diodes [OLED]
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Abstract
A kind of pixel-driving circuit and its control method of offer of the embodiment of the present invention, display panel and display device, are related to display technology field, can solve driving transistor threshold drift problem, improve the uneven problem of display.The pixel-driving circuit includes：The control terminal of capacitance, driving transistor, driving transistor is electrically connected to first node, and the first end of driving transistor is electrically connected to third node；Luminescent device；First switch unit makes to be connected between reference voltage end and first node for the enable signal in response to the first scanning signal end；Second switch unit makes to be connected between second node and data signal end for the enable signal in response to the second scanning signal end；Third switch unit makes to be connected between second node and third node for the enable signal in response to the first scanning signal end；4th switch unit makes to be connected between second source voltage end and third node for the enable signal in response to LED control signal end.
Description
Technical field
The present invention relates to display technology field more particularly to a kind of pixel-driving circuits and its control method, display panel
And display device.
Background technology
In organic light emitting display (Organic Light-Emitting Diode, OLED) device, be provided with each
The corresponding pixel-driving circuit of luminescent device, pixel-driving circuit include driving transistor, pass through the control terminal of driving transistor
Voltage controls the drain current of driving transistor, and drain current is for driving luminescent device to shine.
However, the threshold voltage of the driving transistor in current pixel-driving circuit can drift about with the time, to
OLED is caused to shine unstable, and the threshold voltage shift of the driving transistor of each pixel is different, when to driving transistor
When the input phase is with voltage, since the threshold voltage difference of driving transistor generates different driving currents so that between multiple pixels
Non-uniform light, brightness differs, causes to show bad.
Invention content
The embodiment of the present invention provides a kind of pixel-driving circuit and its control method, display panel and display device, can be with
Improvement is shown bad caused by driving transistor threshold drift problem.
On the one hand, the embodiment of the present invention provides a kind of pixel-driving circuit, including：
The first end of capacitance, the capacitance is electrically connected to first node, and the second end of the capacitance is electrically connected to the second section
Point；
The control terminal of driving transistor, the driving transistor is electrically connected to the first node, the driving transistor
First end be electrically connected to third node；
Luminescent device, the anode of the luminescent device are electrically connected to the second end of the driving transistor, the photophore
The cathode of part is electrically connected to the first power voltage terminal；
First switch unit, is electrically connected to reference voltage end, the first node and the first scanning signal end, and described first
Switch unit is used for the enable signal in response to first scanning signal end, makes the reference voltage end and the first node
Between be connected；
Second switch unit, is electrically connected to the second scanning signal end, data signal end and the second node, and described second
Switch unit is used for the enable signal in response to second scanning signal end, makes the second node and the data signal end
Between be connected；
Third switch unit is electrically connected to first scanning signal end, the second node and the third node, institute
Third switch unit is stated for the enable signal in response to first scanning signal end, makes the second node and the third
It is connected between node；
4th switch unit is electrically connected to second source voltage end, LED control signal end and the third node, described
4th switch unit is used for the enable signal in response to the LED control signal end, makes the second source voltage end and described
It is connected between third node.
On the other hand, the embodiment of the present invention provides a kind of display panel, including above-mentioned pixel-driving circuit.
On the other hand, the embodiment of the present invention provides a kind of display device, including above-mentioned display panel.
On the other hand, the embodiment of the present invention provides a kind of pixel-driving circuit control method, is used for above-mentioned pixel driver
Circuit, the method includes：
First stage, enable signal is provided to first scanning signal end, institute is controlled by the first switch unit
It states and is connected between reference voltage end and the first node, the second node and described is controlled by the third switch unit
It is connected between third node, provides non-enable signal to second scanning signal end, controlled by the second switch unit
End between the data signal end and the second node, provides enable signal to the LED control signal end, pass through institute
It states and is connected between the 4th switch unit control second source voltage end and the third node；
Second stage, enable signal is provided to first scanning signal end, and institute is controlled by the first switch unit
It states and is connected between reference voltage end and the first node, the second node and described is controlled by the third switch unit
It is connected between third node, provides non-enable signal to second scanning signal end, controlled by the second switch unit
End between the data signal end and the second node, provides non-enable signal to the LED control signal end, pass through
4th switch unit controls to be ended between the second source voltage end and the third node；
Phase III provides non-enable signal to first scanning signal end, is controlled by the first switch unit
End between the reference voltage end and the first node, the second node and institute are controlled by the third switch unit
It states and ends between third node, enable signal is provided to second scanning signal end, pass through the second switch unit and control
It is connected between the data signal end and the second node, provides non-enable signal to the LED control signal end, pass through
4th switch unit controls to be ended between the second source voltage end and the third node；
Fourth stage provides non-enable signal to first scanning signal end, is controlled by the first switch unit
End between the reference voltage end and the first node, the second node and institute are controlled by the third switch unit
It states and ends between third node, provide non-enable signal to second scanning signal end, pass through the second switch unit control
It makes and ends between the data signal end and the second node, provide enable signal to the LED control signal end, pass through
4th switch unit controls to be connected between the second source voltage end and the third node.
Pixel-driving circuit and its driving method, display panel in the embodiment of the present invention and display device, may make drive
When dynamic light emission drive transistor device carries out pixel display, driving current that driving transistor generates only with data voltage and second
Supply voltage terminal voltage is related, and unrelated with the threshold voltage of driving transistor, to can avoid flowing through the driving of luminescent device
Electric current is influenced by threshold voltage is uneven with drift, and then effectively raises the equal of the driving current for flowing through luminescent device
Even property, ensure that between each pixel it is luminous uniformly, brightness it is consistent.
Description of the drawings
In order to more clearly explain the embodiment of the invention or the technical proposal in the existing technology, to embodiment or will show below
There is attached drawing needed in technology description to be briefly described, it should be apparent that, the accompanying drawings in the following description is this hair
Some bright embodiments for those of ordinary skill in the art without having to pay creative labor, can be with
Obtain other attached drawings according to these attached drawings.
Fig. 1 is a kind of schematic diagram of pixel-driving circuit in the embodiment of the present invention；
Fig. 2 is the clock signal figure respectively held in pixel-driving circuit in Fig. 1；
Fig. 3 is the schematic diagram of another pixel-driving circuit in the embodiment of the present invention；
Fig. 4 is another clock signal figure respectively held in pixel-driving circuit in Fig. 1 and Fig. 3；
Fig. 5 is a kind of structural schematic diagram of display panel in the embodiment of the present invention；
Local cross-sectional view in the display panel that Fig. 6 is Fig. 5；
Fig. 7 is a kind of structural schematic diagram of display device in the embodiment of the present invention.
Specific implementation mode
In order to make the object, technical scheme and advantages of the embodiment of the invention clearer, below in conjunction with the embodiment of the present invention
In attached drawing, technical scheme in the embodiment of the invention is clearly and completely described, it is clear that described embodiment is
A part of the embodiment of the present invention, instead of all the embodiments.Based on the embodiments of the present invention, those of ordinary skill in the art
The every other embodiment obtained without creative efforts, shall fall within the protection scope of the present invention.
The term used in embodiments of the present invention is the purpose only merely for description specific embodiment, is not intended to be limiting
The present invention.In the embodiment of the present invention and "an" of singulative used in the attached claims, " described " and "the"
It is also intended to including most forms, unless context clearly shows that other meanings.
As shown in FIG. 1, FIG. 1 is a kind of schematic diagram of pixel-driving circuit provided in an embodiment of the present invention, the pixel drivers
Circuit includes：The first end of capacitance Cst, capacitance Cst are electrically connected to first node N1, and the second end of capacitance Cst is electrically connected to
Two node N2；The control terminal of driving transistor T, driving transistor T are electrically connected to first node N1, and the first of driving transistor T
End is electrically connected to third node N3；Luminescent device E, the anode of luminescent device E are electrically connected to the second end of driving transistor T, hair
The cathode of optical device E is electrically connected to the first power voltage terminal Vss；First switch unit 1, be electrically connected to reference voltage end Vref,
First node N1 and the first scanning signal end Scan1, first switch unit 1 are used in response to the first scanning signal end Scan1's
Enable signal makes to be connected between reference voltage end Vref and first node N1, by the signal transmission of reference voltage end Vref to
One node N1；Second switch unit 2 is electrically connected to the second scanning signal end Scan2, data signal end Vdata and second node
N2, second switch unit 2 be used in response to the second scanning signal end Scan2 enable signal, make second node N2 sum numbers it is believed that
Number end Vdata between be connected, by the signal transmission of data signal end Vdata to second node N2；Third switch unit 3, is electrically connected
It is connected to the first scanning signal end Scan1, second node N2 and third node N3, third switch unit 3 in response to first for sweeping
The enable signal for retouching signal end Scan1 makes to be connected between second node N2 and third node N3；4th switch unit 4, electrical connection
In second source voltage end Vdd, LED control signal end Emit and third node N3, the 4th switch unit 4 is used in response to hair
The enable signal of optical control signal end Emit makes to be connected between second source voltage end Vdd and third node N3, by second source
The signal transmission of voltage end Vdd is to third node N3.
As shown in Fig. 2, Fig. 2 is the corresponding a kind of clock signal figure of pixel-driving circuit in Fig. 1, the embodiment of the present invention also carries
For a kind of pixel-driving circuit control method, include for pixel-driving circuit, this method shown in Fig. 1：First stage t1,
Enable signal is provided to the first scanning signal end Scan1, reference voltage end Vref and first segment are controlled by first switch unit 1
It is connected, is connected between controlling second node N2 and third node N3 by third switch unit 3, reference voltage end between point N1
The signal transmission that Vref is provided is to first node N1, and the current potential of first node N1 is Vref at this time；Meanwhile to LED control signal
It holds Emit to provide enable signal, is led between controlling second source voltage end Vdd and third node N3 by the 4th switch unit 4
It is logical, the signal transmission that second source voltage end Vdd is provided to second node N2 and third node N3, second node N2 and the at this time
The current potential of three node N3 is Vdd；Meanwhile non-enable signal is provided to the second scanning signal end Scan2, pass through second switch unit
End between 2 control data signal end Vdata and second node N2.At this point, the current potential Vref and second node of first node N1
The current potential Vdd of N2 is kept by capacitance Cst.
In second stage t2, enable signal is provided to the first scanning signal end Scan1, is controlled by first switch unit 1
It is connected between reference voltage end Vref and first node, second node N2 and third node N3 is controlled by third switch unit 3
Between be connected, provide non-enable signal to the second scanning signal end Scan2, pass through second switch unit 2 and control data signal end
End between Vdata and second node N2, second source voltage end Vdd and third node N3 is controlled by the 4th switch unit 4
Between be connected；It is different with first stage t1, non-enable signal is provided to LED control signal end Emit, passes through the 4th
Switch unit 4 ends between controlling second source voltage end Vdd and third node N3.In the first stage due to driving transistor T
T1 is in the conduction state, this stage, the 4th switch unit 4 was become ending from conducting, under the current potential of third node N3 is since Vdd
Drop, until the current potential of third node N3 is down to current potential Vref+ | Vth |, i.e., second node N2 charges to current potential Vref+ | Vth |, drive
Dynamic transistor T becomes cut-off state, and Vth is the threshold voltage of driving transistor T, second node N2 current potentials Vref+ | Vth |, the
The current potential of one node N1 is still Vref, is kept by capacitance Cst.
In phase III t3, non-enable signal is provided to the first scanning signal end Scan1, is controlled by first switch unit 1
End between reference voltage end Vref and first node N1 processed, second node N2 and third section are controlled by third switch unit 3
End between point N3, non-enable signal is provided to LED control signal end Emit, second source is controlled by the 4th switch unit 4
End between voltage end Vdd and third node N3；Enable signal is provided to the second scanning signal end Scan2, passes through second switch
Unit 2 is connected between controlling data signal end Vdata and second node N2 so that second node N2 current potentials are by Vref+ | Vth | become
For Vdata, the potential change amount of second node N2 is Vdata- (Vref+ | Vth |), while passing through the coupling of capacitance Cst
So that first node N1 current potentials is changed so that first node N1 potential changes be Vref+Vdata- (Vref+ | Vth |)=
Vdata-|Vth|。
In fourth stage t4, non-enable signal is provided to the first scanning signal end Scan1, is controlled by first switch unit 1
End between reference voltage end Vref and first node processed, second node N2 and third node are controlled by third switch unit 3
End between N3, non-enable signal is provided to the second scanning signal end Scan2, data-signal is controlled by second switch unit 2
End between the Vdata and second node N2 of end, provides enable signal to LED control signal end Emit, pass through the 4th switch unit
It is connected between 4 control second source voltage end Vdd and third node N3；By the current potential driving luminescent device E hairs of first node N1
Light, the gate source voltage Vsg=Vdd- (Vdata- | Vth |) of driving transistor T, driving current I=k (Vsg-Vth)2=(Vdd-
Vdata)2, wherein k is constant, it is known that, in final driving current formula, the influence of threshold voltage vt h is eliminated, therefore,
Luminescent device E can be driven to shine by driving current I.So that flow through luminescent device E electric current and threshold voltage vt h without
It closes.
Pixel-driving circuit in the embodiment of the present invention and its driving method, driving transistor generate driving current only with
Second source voltage terminal voltage Vdd is related to data-signal terminal voltage Vdata, and unrelated with the threshold voltage of driving transistor,
Driving current to can avoid flowing through luminescent device is influenced by threshold voltage is uneven with drift, and then is effectively improved
The uniformity for flowing through the driving current of luminescent device, ensure that between each pixel it is luminous uniformly, brightness it is consistent.In addition, this
The device of pixel-driving circuit in inventive embodiments is less, and occupied space is less, is advantageously implemented higher resolution ratio.
Optionally, as shown in Fig. 2, Fig. 2 is the corresponding a kind of clock signal figure of pixel-driving circuit in Fig. 1, the present invention is real
It applies example and a kind of pixel-driving circuit control method is also provided, wherein the duration of first stage t1 is less than the duration of second stage t2.
Specifically, time first stage t1 be arranged it is shorter, to avoid time first stage t1 it is too long can it is unnecessary extend shine
The driving time of device E influences to show, since second stage t2 needs to ensure that second node N2 charges to Vref+ | Vth |, i.e.,
Carry out valve value compensation write-in, therefore the second stage t2 times should be arranged it is longer, and be more than time first stage t1.
Optionally, as shown in Figure 1, first switch unit 1 includes first film transistor M1, first film transistor M1's
Control terminal is electrically connected to the first scanning signal end Scan1, and the first end of first film transistor M1 is electrically connected to reference voltage end
The second end of Vref, first film transistor M1 are electrically connected to first node N1；Second switch unit 2 includes the second film crystal
The control terminal of pipe M2, the second thin film transistor (TFT) M2 are electrically connected to the second scanning signal end Scan2, and the of the second thin film transistor (TFT) M2
One end is electrically connected to data signal end Vdata, and the second end of the second thin film transistor (TFT) M2 is electrically connected to second node N2；Third is opened
It includes third thin film transistor (TFT) M3 to close unit 3, and the control terminal of third thin film transistor (TFT) M3 is electrically connected to the first scanning signal end
The first end of Scan1, third thin film transistor (TFT) M3 are electrically connected to second node N2, and the second end of third thin film transistor (TFT) M3 is electrically connected
It is connected to third node N3；4th switch unit 4 includes the 4th thin film transistor (TFT) M4, and the control terminal of the 4th thin film transistor (TFT) M4 is electrically connected
It is connected to LED control signal end Emit, the first end of the 4th thin film transistor (TFT) M4 is electrically connected to second source voltage end Vdd, and the 4th
The second end of thin film transistor (TFT) M4 is electrically connected to third node N3.
Specifically, first stage t1 provides enable signal to the first scanning signal end Scan1, makes first film transistor
M1 and third thin film transistor (TFT) M3 are connected, the signal transmission that reference voltage end Vref is provided to first node N1, at this time first segment
The current potential of point N1 is Vref；Meanwhile enable signal is provided to LED control signal end Emit, so that the 4th thin film transistor (TFT) M4 is led
It is logical, the signal transmission that second source voltage end Vdd is provided to second node N2 and third node N3, second node N2 and the at this time
The current potential of three node N3 is Vdd；Meanwhile non-enable signal is provided to the second scanning signal end Scan2, make the second thin film transistor (TFT)
M2 ends.At this point, the current potential Vdd of the current potential Vref and second node N2 of first node N1 is kept by capacitance Cst.
In second stage t2, enable signal, first film transistor M1 and third are provided to the first scanning signal end Scan1
Thin film transistor (TFT) M3 conductings, non-enable signal is provided to the second scanning signal end Scan2, makes the second thin film transistor (TFT) M2 cut-offs,
It is different with first stage t1, non-enable signal is provided to LED control signal end Emit, makes the 4th thin film transistor (TFT)
M4 ends.Since t1 is in the conduction state in the first stage by driving transistor T, the 4th thin film transistor (TFT) M4 of this stage is become by conducting
For cut-off, the current potential of third node N3 is begun to decline from Vdd, until the current potential of third node N3 is down to current potential Vref+ | Vth |,
I.e. second node N2 charges to current potential Vref+ | Vth |, driving transistor T becomes cut-off state, and Vth is the threshold of driving transistor T
Threshold voltage, second node N2 current potentials Vref+ | Vth |, the current potential of first node N1 is still Vref, is kept by capacitance Cst.
In phase III t3, non-enable signal is provided to the first scanning signal end Scan1, lead to first film transistor M1 and
The M3 cut-offs of third thin film transistor (TFT) provide non-enable signal, the 4th thin film transistor (TFT) M4 cut-offs to LED control signal end Emit；
There is provided enable signal, the second thin film transistor (TFT) M2 conducting to the second scanning signal end Scan2 so that second node N2 current potentials by
Vref+ | Vth | become Vdata, the potential change amount of second node N2 is Vdata- (Vref+ | Vth |), while passing through capacitance
The coupling of Cst makes first node N1 current potentials change so that first node N1 potential changes are Vref+Vdata-
(Vref+ | Vth |)=Vdata- | Vth |.
In fourth stage t4, non-enable signal is provided to the first scanning signal end Scan1, first film transistor M1 and the
Three thin film transistor (TFT) M3 cut-offs provide non-enable signal to the second scanning signal end Scan2, and the second thin film transistor (TFT) M2 ends,
Enable signal, the 4th thin film transistor (TFT) M4 conductings are provided to LED control signal end Emit；It is driven by the current potential of first node N1
Luminescent device E shines, the gate source voltage Vsg=Vdd- of driving transistor T (Vdata- | Vth |), driving current I=k (Vsg-
Vth)2=(Vdd-Vdata)2, wherein k is constant, it is known that, in final driving current formula, eliminate threshold voltage vt h's
Influence so that flow through luminescent device E electric current and threshold voltage vt h it is unrelated.Therefore, it can be driven by driving current I
Luminescent device E shines.
Optionally, as shown in figure 3, Fig. 3 is the schematic diagram of another pixel-driving circuit in the embodiment of the present invention, above-mentioned picture
Plain driving circuit further includes：The first end of 5th thin film transistor (TFT) M5, the 5th thin film transistor (TFT) M5 are electrically connected to luminescent device E's
The second end of anode, the 5th thin film transistor (TFT) M5 is electrically connected to reference voltage end Vref.The control terminal of 5th thin film transistor (TFT) M5
It is electrically connected to the first scanning signal end Scan1.5th thin film transistor (TFT) M5 for realizing luminescent device E anodes reset.
Specifically, as shown in Figures 2 and 3, t1 and second stage t2 in the first stage, the 5th thin film transistor (TFT) M5 conductings,
The reference voltage Vref that reference voltage end Vref is provided is set to be transmitted to the anode of luminescent device E, to realize that anode resets.
It should be noted that in structure shown in Fig. 3, the control terminal of the 5th thin film transistor (TFT) M5 is electrically connected to the first scanning
Signal end Scan1, still, the embodiment of the present invention is not construed as limiting this, and in other achievable embodiments, the 5th film is brilliant
The control terminal of body pipe M5 can not also be connected to the first scanning signal end Scan1, for example, the control terminal of the 5th thin film transistor (TFT) M5
It is electrically connected to the second scanning signal end Scan2, at this point, as shown in Fig. 2, in phase III t3, the 5th thin film transistor (TFT) M5 is connected,
So that the reference voltage Vref that reference voltage end Vref is provided is transmitted to the anode of luminescent device E, realizes that anode resets.
As shown in figure 4, Fig. 4 is another clock signal figure of pixel-driving circuit in Fig. 1, an embodiment of the present invention provides
Another pixel-driving circuit control method, based on clock signal figure shown in Fig. 4, for pixel shown in Fig. 1 or Fig. 3
Driving circuit, this method is compared to the above, is that new step is increased on the basis of original step：
Further include the first buffer stage t2 ' before phase III t3 after second stage t2, rank is buffered first
Section t2 ', non-enable signal is provided to the first scanning signal end Scan1, and reference voltage end Vref is controlled by first switch unit 1
End between first node, ends between controlling second node N2 and third node N3 by third switch unit 3, i.e., first
Thin film transistor (TFT) M1 and third thin film transistor (TFT) M3 conductings provide non-enable signal to the second scanning signal end Scan2, by the
End between two switch units 2 control data signal end Vdata and second node N2, i.e. the second thin film transistor (TFT) M2 cut-offs, to
LED control signal end Emit provides non-enable signal, and second source voltage end Vdd and third are controlled by the 4th switch unit 4
End between node N3, even if the 4th thin film transistor (TFT) M4 cut-offs.
Further include the second buffer stage t3 ' before fourth stage t4 after phase III t3, rank is buffered second
Section t3 ', non-enable signal is provided to the first scanning signal end Scan1, and reference voltage end Vref is controlled by first switch unit 1
End between first node, ends between controlling second node N2 and third node N3 by third switch unit 3, i.e., first
Thin film transistor (TFT) M1 and third thin film transistor (TFT) M3 cut-offs provide non-enable signal to the second scanning signal end Scan2, by the
End between two switch units 2 control data signal end Vdata and second node N2, i.e. the second thin film transistor (TFT) M2 cut-offs, to
LED control signal end Emit provides non-enable signal, and second source voltage end Vdd and third are controlled by the 4th switch unit 4
End between node N3, i.e. the 4th thin film transistor (TFT) M4 cut-offs.
Specifically, include two buffer stages t2 ' and t3 ', at the two in clock signal figure as shown in Figure 4
Buffer stage, the first scanning signal end Scan1, the second scanning signal end Scan2 and LED control signal end Emit are provided which non-
Enable signal is further ensured that the performance of pixel-driving circuit with influencing each other between completely cutting off each stage.
It should be noted that each thin film transistor (TFT) and driving transistor shown in Fig. 1 and Fig. 3 are P-type transistor.But
It is that the embodiment of the present invention is not construed as limiting the Control Cooling of thin film transistor (TFT) and driving transistor, for example, each thin film transistor (TFT)
It all can be N-type transistor at least one of driving transistor T or arbitrary combinations.In addition, the control with each thin film transistor (TFT)
The signal type that the control signal end of end connection processed is provided is related to the Control Cooling of thin film transistor (TFT), for example, it is thin to work as first
When film transistor M1 is P-type transistor, the enable signal that the first scanning signal end Scan1 is provided is low level, the first scanning
The non-enable signal that signal end Scan1 is provided is high level；When first film transistor M1 is N-type transistor, first sweeps
It is high level to retouch the enable signal that signal end Scan1 is provided, and the non-enable signal that the first scanning signal end Scan1 is provided is
Low level.
Optionally, as shown in Figure 1, first film transistor M1, the second thin film transistor (TFT) M2, third thin film transistor (TFT) M3,
4th thin film transistor (TFT) M4, the 5th thin film transistor (TFT) M5 and driving transistor T are P-type transistor.
Optionally, luminescent device E is Organic Light Emitting Diode.
It should be noted that the embodiment of the present invention is not construed as limiting the type of luminescent device E, it is any can apply it is above-mentioned
The luminescent device of driving circuit and driving method can be as the luminescent device E in the embodiment of the present invention, such as organic light emission
Diode or micro- light emitting diode.
Optionally, as shown in Fig. 1 or Fig. 3, first film transistor M1 is double-gate structure and/or the second thin film transistor (TFT) is
Double-gate structure.
Specifically, the current potential at first node N1 and second node N2 determines the light emission luminance of luminescent device E, due to
One thin film transistor (TFT) M1 and the second thin film transistor (TFT) M2 are directly connected to external signal, therefore first film transistor M1 can be arranged
With the second thin film transistor (TFT) M2 first film transistor can be further decreased in this way, compared with single grid structure for double-gate structure
The leakage current of M1 and the second thin film transistor (TFT) M2, to further avoid the current potential at first node N1 and second node N2 due to
The leakage current of first film transistor M1 and the second thin film transistor (TFT) M2 and change.
As shown in Figure 5 and Figure 6, Fig. 5 is a kind of structural schematic diagram of display panel in the embodiment of the present invention, and Fig. 6 is Fig. 5's
Local cross-sectional view in display panel, the embodiment of the present invention also provide a kind of display panel 100, including such as Fig. 1 or
Arbitrary pixel-driving circuit in Fig. 3.
Specifically, display panel 100 includes multiple sub-pixels 101 of matrix distribution, and each sub-pixel corresponds to a pixel
Driving circuit, often row sub-pixel 101 correspond to the first scan line S1, the second scan line S2 and third scan line S3, wherein first sweeps
Line S1 is retouched for providing the row sub-pixel corresponding first scanning signal end Scan1, the second scan line S2 for providing row
Pixel corresponding second scanning signal end Scan2, third scan line S3 are for providing the row sub-pixel corresponding light emitting control letter
Number end Emit, as shown in fig. 6, for example, each luminescent device E includes the anode layer 21, luminescent layer 22 and cathode layer set gradually
23, driving transistor T include source electrode M11, drain electrode M12, grid M13 and active layer M14, capacitance C include first electrode plate C1 and
Second electrode plate C2, wherein grid M13 and second electrode plate C2 are located at the first metal layer, and first electrode plate C1 is located at the second metal
Layer, source electrode M11 and drain electrode M12 are located at third metal layer, in side of the anode layer 21 far from cathode layer 23, are disposed with third
Metal layer, second metal layer, the first metal layer and active layer M14, drain electrode M12 are connected to anode layer 21 by via.
It should be noted that only illustrated in Fig. 6 driving transistor T in pixel-driving circuit and storage capacitance Cst this
The layer structure of two elements, other transistors can be identical as the structure of driving transistor T, and connects with the anode of luminescent device E
The transistor connect can be adjusted according to the specific connection structure of pixel-driving circuit.In addition, the relationship of each layer structure is also simultaneously
It is not limited to structure shown in Fig. 6, for example, first electrode plate C1 and second electrode plate C2 can also make in other layers, only
Want to constitute two electrode plates of capacitance.If luminescent device E is top light emitting structure, i.e. luminescent device E is from cathode layer 23
Side far from anode layer 21 shines, then each element in pixel-driving circuit can be arranged in the lower section of luminescent device E；If
Luminescent device E is bottom light emitting structure, i.e. luminescent device E shines from side of the anode layer 21 far from cathode layer 23, then pixel driver
Each element needs in circuit are arranged except the light-emitting zone of luminescent device E, to ensure that harmful effect will not be caused to display.
Wherein, the concrete structure of pixel-driving circuit and operation principle are same as the previously described embodiments, and details are not described herein.
Display panel in the embodiment of the present invention, the driving current that driving transistor generates are only electric with second source voltage end
Press Vdd related to data-signal terminal voltage Vdata, and it is unrelated with the threshold voltage of driving transistor, to can avoid flowing through hair
The driving current of optical device is influenced by threshold voltage is uneven with drift, and then is effectively raised and flowed through luminescent device
The uniformity of driving current, ensure that between each pixel it is luminous uniformly, brightness it is consistent.
As shown in fig. 7, Fig. 7 is a kind of structural schematic diagram of display device in the embodiment of the present invention, the embodiment of the present invention carries
For a kind of display device, including above-mentioned display panel 100.
Wherein, the concrete structure of display panel 100 and principle are same as the previously described embodiments, and details are not described herein.Display dress
It can be any with aobvious such as touch display screen, mobile phone, tablet computer, laptop, electric paper book or television set to set
Show the electronic equipment of function.
Display device in the embodiment of the present invention, the driving current that driving transistor generates are only electric with second source voltage end
Press Vdd related to data-signal terminal voltage Vdata, and it is unrelated with the threshold voltage of driving transistor, to can avoid flowing through hair
The driving current of optical device is influenced by threshold voltage is uneven with drift, and then is effectively raised and flowed through luminescent device
The uniformity of driving current, ensure that between each pixel it is luminous uniformly, brightness it is consistent.
The foregoing is merely illustrative of the preferred embodiments of the present invention, is not intended to limit the invention, all essences in the present invention
With within principle, any modification, equivalent substitution, improvement and etc. done should be included within the scope of protection of the invention god.
Finally it should be noted that：The above embodiments are only used to illustrate the technical solution of the present invention., rather than its limitations；To the greatest extent
Present invention has been described in detail with reference to the aforementioned embodiments for pipe, it will be understood by those of ordinary skill in the art that：Its according to
So can with technical scheme described in the above embodiments is modified, either to which part or all technical features into
Row equivalent replacement；And these modifications or replacements, various embodiments of the present invention technology that it does not separate the essence of the corresponding technical solution
The range of scheme.
Claims (13)
1. a kind of pixel-driving circuit, which is characterized in that including：
The first end of capacitance, the capacitance is electrically connected to first node, and the second end of the capacitance is electrically connected to second node；
Driving transistor, the control terminal of the driving transistor are electrically connected to the first node, and the of the driving transistor
One end is electrically connected to third node；
Luminescent device, the anode of the luminescent device are electrically connected to the second end of the driving transistor, the luminescent device
Cathode is electrically connected to the first power voltage terminal；
First switch unit is electrically connected to reference voltage end, the first node and the first scanning signal end, the first switch
Unit is used for the enable signal in response to first scanning signal end, makes between the reference voltage end and the first node
Conducting；
Second switch unit is electrically connected to the second scanning signal end, data signal end and the second node, the second switch
Unit is used for the enable signal in response to second scanning signal end, makes between the second node and the data signal end
Conducting；
Third switch unit, is electrically connected to first scanning signal end, the second node and the third node, and described
Three switch units are used for the enable signal in response to first scanning signal end, make the second node and the third node
Between be connected；
4th switch unit, is electrically connected to second source voltage end, LED control signal end and the third node, and the described 4th
Switch unit is used for the enable signal in response to the LED control signal end, makes the second source voltage end and the third
It is connected between node.
2. pixel-driving circuit according to claim 1, which is characterized in that
The first switch unit includes first film transistor, and the control terminal of the first film transistor is electrically connected to described
The first end at the first scanning signal end, the first film transistor is electrically connected to the reference voltage end, the first film
The second end of transistor is electrically connected to the first node；
The second switch unit includes the second thin film transistor (TFT), and the control terminal of second thin film transistor (TFT) is electrically connected to described
The first end at the second scanning signal end, second thin film transistor (TFT) is electrically connected to the data signal end, second film
The second end of transistor is electrically connected to the second node；
The third switch unit includes third thin film transistor (TFT), and the control terminal of the third thin film transistor (TFT) is electrically connected to described
The first end at the first scanning signal end, the third thin film transistor (TFT) is electrically connected to the second node, and the third film is brilliant
The second end of body pipe is electrically connected to the third node；
4th switch unit includes the 4th thin film transistor (TFT), and the control terminal of the 4th thin film transistor (TFT) is electrically connected to described
LED control signal end, the first end of the 4th thin film transistor (TFT) are electrically connected to the second source voltage end, and the described 4th
The second end of thin film transistor (TFT) is electrically connected to the third node.
3. pixel-driving circuit according to claim 2, which is characterized in that further include：
The first end of 5th thin film transistor (TFT), the 5th thin film transistor (TFT) is electrically connected to the anode of the luminescent device, described
The second end of 5th thin film transistor (TFT) is electrically connected to the reference voltage end.
4. pixel-driving circuit according to claim 3, which is characterized in that
The control terminal of 5th thin film transistor (TFT) is electrically connected to first scanning signal end.
5. pixel-driving circuit according to claim 3, which is characterized in that
The control terminal of 5th thin film transistor (TFT) is electrically connected to second scanning signal end.
6. pixel-driving circuit according to claim 3, which is characterized in that
The first film transistor, second thin film transistor (TFT), the third thin film transistor (TFT), the 4th film crystal
Pipe, the 5th thin film transistor (TFT) and the driving transistor are P-type transistor.
7. pixel-driving circuit according to claim 2, which is characterized in that
The first film transistor is double-gate structure and/or second thin film transistor (TFT) is double-gate structure.
8. a kind of display panel, which is characterized in that including pixel-driving circuit as claimed in any of claims 1 to 7 in one of claims.
9. a kind of display device, which is characterized in that including display panel as claimed in claim 8.
10. a kind of pixel-driving circuit control method, which is characterized in that for as claimed in any of claims 1 to 7 in one of claims
Pixel-driving circuit, the method includes：
First stage, enable signal is provided to first scanning signal end, the ginseng is controlled by the first switch unit
It examines and is connected between voltage end and the first node, the second node and the third are controlled by the third switch unit
It is connected between node, non-enable signal is provided to second scanning signal end, described in second switch unit control
End between data signal end and the second node, provides enable signal to the LED control signal end, pass through described the
Four switch units control to be connected between the second source voltage end and the third node；
Second stage, enable signal is provided to first scanning signal end, and the ginseng is controlled by the first switch unit
It examines and is connected between voltage end and the first node, the second node and the third are controlled by the third switch unit
It is connected between node, non-enable signal is provided to second scanning signal end, described in second switch unit control
End between data signal end and the second node, non-enable signal is provided to the LED control signal end, by described
4th switch unit controls to be ended between the second source voltage end and the third node；
Phase III provides non-enable signal to first scanning signal end, described in first switch unit control
End between reference voltage end and the first node, the second node and described the are controlled by the third switch unit
End between three nodes, enable signal is provided to second scanning signal end, described in second switch unit control
It is connected between data signal end and the second node, non-enable signal is provided to the LED control signal end, by described
4th switch unit controls to be ended between the second source voltage end and the third node；
Fourth stage provides non-enable signal to first scanning signal end, described in first switch unit control
End between reference voltage end and the first node, the second node and described the are controlled by the third switch unit
End between three nodes, non-enable signal is provided to second scanning signal end, institute is controlled by the second switch unit
It states and ends between data signal end and the second node, enable signal is provided to the LED control signal end, by described
4th switch unit controls to be connected between the second source voltage end and the third node.
11. according to the method described in claim 10, it is characterized in that,
The duration of the first stage is less than the duration of the second stage.
12. according to the method described in claim 10, it is characterized in that,
Further include the first buffer stage before the phase III after the second stage, in the first buffering rank
Section, non-enable signal is provided to first scanning signal end, and the reference voltage end is controlled by the first switch unit
End between the first node, is controlled between the second node and the third node by the third switch unit
Cut-off, non-enable signal is provided to second scanning signal end, and the data-signal is controlled by the second switch unit
End between end and the second node, provides non-enable signal to the LED control signal end, switched by the described 4th
Unit controls to be ended between the second source voltage end and the third node.
13. according to the method described in claim 10, it is characterized in that,
Further include the second buffer stage before the fourth stage after the phase III, in the second buffering rank
Section, non-enable signal is provided to first scanning signal end, and the reference voltage end is controlled by the first switch unit
End between the first node, is controlled between the second node and the third node by the third switch unit
Cut-off, non-enable signal is provided to second scanning signal end, and the data-signal is controlled by the second switch unit
End between end and the second node, provides non-enable signal to the LED control signal end, switched by the described 4th
Unit controls to be ended between the second source voltage end and the third node.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201810111279.9A CN108281112A (en) | 2018-02-05 | 2018-02-05 | Pixel-driving circuit and its control method, display panel and display device |
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| CN201810111279.9A CN108281112A (en) | 2018-02-05 | 2018-02-05 | Pixel-driving circuit and its control method, display panel and display device |
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| CN110349540A (en) * | 2019-07-26 | 2019-10-18 | 京东方科技集团股份有限公司 | The control method of pixel-driving circuit, display device and pixel-driving circuit |
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| CN111243502A (en) * | 2018-11-29 | 2020-06-05 | 昆山工研院新型平板显示技术中心有限公司 | Pixel driving circuit and display device |
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