CN108428434A - Pixel circuit, organic light emitting display panel and display device - Google Patents
Pixel circuit, organic light emitting display panel and display device Download PDFInfo
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- CN108428434A CN108428434A CN201810161795.2A CN201810161795A CN108428434A CN 108428434 A CN108428434 A CN 108428434A CN 201810161795 A CN201810161795 A CN 201810161795A CN 108428434 A CN108428434 A CN 108428434A
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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]
- G09G3/3225—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] using an active matrix
Abstract
The invention discloses a kind of pixel circuits, organic light emitting display panel and display device, pixel circuit is controlled by three scanning signal ends, first scanning signal end, second scanning signal end and third scanning signal end are sequentially output scanning signal, therefore these three scanning signal ends are not present while exporting the period of scanning signal, mean in pixel circuit provided in an embodiment of the present invention, there is no the 5th switching transistors, 7th switching transistor, 4th switching transistor, the case where first switch transistor and the 6th switching transistor simultaneously turn on, therefore luminescent device can be flowed to by the 6th switching transistor to the electric current of Vref accesses there is no Data, to solve the problems, such as that dark-state existing for existing pixel circuit is not dark.
Description
Technical field
The present invention relates to display technology field, espespecially a kind of pixel circuit, organic light emitting display panel and display device.
Background technology
Organic light emitting display (Organic Light Emitting Diode, OLED) is that current flat-panel monitor is ground
One of the hot spot for studying carefully field, compared with liquid crystal display, OLED have low low energy consumption, production cost, self-luminous, wide viewing angle and
The advantages that fast response time, currently, in flat display fields such as mobile phone, PDA, digital cameras, OLED has begun substitution tradition
Liquid crystal display (Liquid Crystal Display, LCD).Wherein, pixel circuit design is OLED display core skill
Art content has important research significance.
A kind of structure of existing pixel circuit is as shown in Figure 1, include 7 switching transistors：M1~M7,1 driving are brilliant
Body pipe M0 and 1 capacitance C1.Corresponding input timing figure is as shown in Figure 2.Although the circuit is improved by internal compensation because of work
Uneven problem is shown caused by driving transistor M0 threshold voltage shifts caused by skill and transistor ageing, but in practical work
When making, the panel producer has found there is shorter T time section, and switching transistor M2, M3, M4, M5, M7 and M8 are both turned on, data
Switching transistor M2, M3, M5 and M7 that the signal of signal end Vdata passes sequentially through conducting flow to reference signal end Vref, from
And electric current is generated in reference signal end Vref, luminescent device oled is flowed to further through the switching transistor M8 of conducting, makes photophore
Part oled shines, not dark to lead to the problem of dark-state.
Invention content
In view of this, an embodiment of the present invention provides a kind of pixel circuit, organic light emitting display panel and display device,
To solve the problems, such as that dark-state existing in the prior art is not dark.
A kind of pixel circuit provided in an embodiment of the present invention, including：Driving transistor, first switch transistor, second open
Pass transistor, third switching transistor, the 4th switching transistor, the 5th switching transistor, the 6th switching transistor, the 7th open
Close transistor and the first capacitance；Wherein,
The first switch transistor is for providing the signal at reference signal end under the control at the first scanning signal end
To the first pole of the 4th switching transistor；
The second switch transistor by the signal of power voltage terminal under the control at light emitting control end for being supplied to institute
State the first pole of driving transistor；
The third switching transistor under the control at the light emitting control end for making the second of the driving transistor
Pole is connected with the second pole of the third switching transistor；
First pole of the 4th switching transistor and the second pole of the 7th switching transistor are electrically connected in series, and are used
The grid for making the driving transistor under the control at the second scanning signal end and the second pole of the driving transistor are led
It is logical；
5th switching transistor is used for the signal of data signal end under the control at second scanning signal end
It is supplied to the first pole of the driving transistor, the 6th switching transistor to be used under the control at third scanning signal end
The signal at the reference signal end is supplied to the anode of luminescent device；Alternatively,
5th switching transistor is for providing the signal of data signal end under the control at third scanning signal end
To the first pole of the driving transistor, the 6th switching transistor is used under the control at first scanning signal end
The signal at the reference signal end is supplied to the anode of luminescent device；
First capacitance is for making the voltage difference between the grid of the driving transistor and the power voltage terminal protect
It is fixed to keep steady；
The driving transistor is used in the second switch transistor, the third switching transistor and described first
Under the control of capacitance driving current is provided for the luminescent device.
Correspondingly, the embodiment of the present invention additionally provides a kind of organic light emitting display panel, including N rows pixel unit, N+2
Scan line and N+2 grades of shifting deposit units, wherein shifting deposit unit described in per level-one is correspondingly connected with the scanning
Line, N are the integer more than 0；
The pixel unit includes the pixel circuit provided in an embodiment of the present invention and connects with each pixel circuit
The luminescent device connect；
First scanning signal end of the pixel circuit in line n pixel unit is connected with nth bar scan line, line n pixel
Second scanning signal end of the pixel circuit in unit is connected with (n+1)th scan line, the pixel electricity in line n pixel unit
The third scanning signal end on road is connected with the n-th+2 scan lines.
Correspondingly, the embodiment of the present invention additionally provides a kind of display device, including organic hair provided in an embodiment of the present invention
Light display panel.
The present invention has the beneficial effect that：
Above-mentioned pixel circuit, organic light emitting display panel and display device provided in an embodiment of the present invention, pixel circuit quilt
Three scanning signal end controls, the first scanning signal end, the second scanning signal end and third scanning signal end are to be sequentially output to sweep
Signal is retouched, therefore these three scanning signal ends are not present while exporting the period of scanning signal, it is meant that the present invention is implemented
In the pixel circuit that example provides, there is no the 5th switching transistor, the 7th switching transistor, the 4th switching transistor, first to open
The case where pass transistor and the 6th switching transistor simultaneously turn on, therefore can pass through to the electric current of Vref accesses there is no Data
6th switching transistor flows to luminescent device, to solve the problems, such as that dark-state existing for existing pixel circuit is not dark.
Description of the drawings
Fig. 1 is the structural schematic diagram of the pixel circuit provided in the related technology；
Fig. 2 is the corresponding input timing figure of pixel circuit shown in FIG. 1；
Fig. 3 is a kind of structural schematic diagram of pixel circuit provided in an embodiment of the present invention；
Fig. 4 is the structural schematic diagram of another pixel circuit provided in an embodiment of the present invention；
Fig. 5 is the corresponding input timing figure of pixel circuit provided in an embodiment of the present invention；
Fig. 6 is the structural schematic diagram of organic light emitting display panel provided in an embodiment of the present invention；
Fig. 7 is the structural schematic diagram of display device provided in an embodiment of the present invention.
Specific implementation mode
Specifically, in pixel circuit shown in Fig. 1, when Scan1 and Scan2 is simultaneously low level signal, by imitative
True simulation finds, deposits Data to Vref electric currents, and the electric current on a pixel circuit is about 1.14uA, on one-row pixels circuit
Total current estimation has 3.28mA, and the electric current in dark-state a, pixel circuit is about 2.18uA, one-row pixels circuit
On total current estimation have 6.28mA, therefore luminescent device has that dark-state is not dark.
In view of this, an embodiment of the present invention provides a kind of pixel circuit, organic light emitting display panel and display device,
To solve the problems, such as that dark-state is not dark.
To make the objectives, technical solutions, and advantages of the present invention clearer, below in conjunction with attached drawing to the present invention make into
It is described in detail to one step, it is clear that described embodiment is only a part of the embodiment of the present invention, instead of all the embodiments.
Based on the embodiments of the present invention, institute obtained by those of ordinary skill in the art without making creative efforts
There are other embodiments, shall fall within the protection scope of the present invention.
The shapes and sizes of each component do not reflect that actual proportions, purpose are schematically illustrate the content of present invention in attached drawing.
Specifically, an embodiment of the present invention provides a kind of pixel circuits, as shown in Figure 3 and Figure 4, including：Driving transistor
M0, first switch transistor M1, second switch transistor M2, third switching transistor M3, the 4th switching transistor M4, the 5th
Switching transistor M5, the 6th switching transistor M6, the 7th switching transistor M7 and the first capacitance C1；Wherein,
First switch transistor M1 is used for reference signal end Vref's under the control of the first scanning signal end Scan1
Signal is supplied to the first pole of the 4th switching transistor M4；
Second switch transistor M2 is used for the letter of the first power voltage terminal VDD under the control of light emitting control end Emit
Number it is supplied to the first pole of driving transistor M0；
Third switching transistor M3 be used to make under the control of light emitting control end Emit the second pole of driving transistor M0 with
The second pole of third switching transistor M3 is connected；
The first pole of 4th switching transistor M4 and the second pole of the 7th switching transistor M7 are electrically connected in series, and are used for
The grid of driving transistor M0 is set to be connected with the second pole of driving transistor M0 under the control of second scanning signal end Scan2；
As shown in figure 3, the 5th switching transistor M5 is for believing data under the control of the second scanning signal end Scan2
The signal of number end Data is supplied to the first pole of driving transistor M0, the 6th switching transistor M6 to be used in third scanning signal
Hold the anode that the signal of reference signal end Vref is supplied to luminescent device oled under the control of Scan3；Alternatively, such as Fig. 4 institutes
Show, the 5th switching transistor M5 is for carrying the signal of data signal end Data under the control of third scanning signal end Scan3
The first pole of driving transistor M0 is supplied, the 6th switching transistor M6 is used under the control of the first scanning signal end Scan1 will
The signal of reference signal end Vref is supplied to the anode of luminescent device oled；
First capacitance C1 is used to make the voltage difference between the grid and power voltage terminal of driving transistor M0 to keep stablizing；
Driving transistor M0 is used for the control in second switch transistor M2, third switching transistor M3 and the first capacitance C1
System is lower to provide driving current for luminescent device.
Pixel circuit provided in an embodiment of the present invention is controlled by three scanning signal ends, the first scanning signal end, second
Scanning signal end and third scanning signal end are sequentially output scanning signal, therefore there is no same at these three scanning signal ends
When export scanning signal period, it is meant that in pixel circuit provided in an embodiment of the present invention, there is no the 5th switch crystal
The feelings that pipe, the 7th switching transistor, the 4th switching transistor, first switch transistor and the 6th switching transistor simultaneously turn on
Condition, therefore luminescent device can be flowed to by the 6th switching transistor to the electric current of Vref accesses there is no Data, it is existing to solve
The problem for having dark-state existing for pixel circuit not dark.
Specifically, in pixel circuit provided in an embodiment of the present invention, as shown in Figure 3 and Figure 4, luminescent device oled's
Cathode is connect with second source voltage end VEE, and the voltage of second source voltage end VEE is generally negative voltage or ground connection.
Specifically, in pixel circuit provided in an embodiment of the present invention, luminescent device oled is generally organic light-emitting diodes
Pipe, is not limited thereto.
Specifically, in pixel circuit provided in an embodiment of the present invention, as shown in Figure 3 and Figure 4, second switch transistor
The grid of M2 is connected with light emitting control end Emit, and the first pole of second switch transistor M2 is connected with power voltage terminal, and second opens
The second pole for closing transistor M2 is extremely connected with the first of driving transistor M0.When second switch transistor M2 is at light emitting control end
When the lower conducting of Emit controls, the signal transmission of the first power voltage terminal VDD to second node N2.
Specifically, in pixel circuit provided in an embodiment of the present invention, as shown in Figure 3 and Figure 4, third switching transistor
The grid of M3 is connected with light emitting control end Emit, the first pole of third switching transistor M3 and the second pole of driving transistor M0
It is connected, the second pole of third switching transistor M3 is connected with the anode of luminescent device.When third switching transistor M3 is in the control that shines
Under Emit controls in end processed when conducting, driving transistor M0 provides driving current to luminescent device oled.
Specifically, in pixel circuit provided in an embodiment of the present invention, as shown in Figure 3 and Figure 4, the 4th switching transistor
The grid of M4 is connected with the second scanning signal end Scan2, the grid of the first pole and driving transistor M0 of the 4th switching transistor M4
Extremely it is connected, the second pole of the 4th switching transistor M4 is connect with the first pole of the 7th switching transistor M7, the 7th switching transistor
The second pole of M7 is extremely connected with the second of driving transistor M0, the grid of the 7th switching transistor M7 and the second scanning signal end
Scan2 is connected.When the 4th switching transistor M4 and the 7th switching transistor M7 is led under the second scanning signal end Scan2 controls
When logical, driving transistor M0 is made to connect into diode structure, to be compensated to the threshold voltage of driving transistor M0.And
And since the 4th switching transistor M4 ends in glow phase, even if there is leakage current to flow to the of the 4th switching transistor M4
Two poles will not flow further to the grid of driving transistor M0, i.e. the grid potential of glow phase driving transistor M0 will not
It is influenced by remaining transistor leakage current, has fully ensured that the uniformity of luminance of glow phase.
Optionally, in pixel circuit provided in an embodiment of the present invention, the breadth length ratio of driving transistor is that entire pixel is driven
The width that the transistor of breadth length ratio minimum in dynamic circuit, the i.e. breadth length ratio of driving transistor are less than any one switching transistor is long
Than ensureing that the driving current size for flowing through driving transistor can meet the higher light emission luminance of luminescent device.Meanwhile this hair
In bright embodiment, in order to fully ensure that the stability of driving transistor grid potential, the breadth length ratio of the 4th switching transistor are less than
First switch transistor, second switch transistor, third switching transistor, the 5th switching transistor, the 6th switching transistor and
The breadth length ratio of any one switching transistor in 7th switching transistor.
Specifically, in pixel circuit provided in an embodiment of the present invention, as shown in Figure 3 and Figure 4, first switch transistor
The grid of M1 is connected with the first scanning signal end Scan1, the first pole and the reference signal end Vref phases of first switch transistor M1
Even, the second pole of first switch transistor M1 is connected to the second pole and the 7th switching transistor M7 of the 4th switching transistor M4
The first pole between.
Specifically, in pixel circuit provided in an embodiment of the present invention, as shown in figure 3, the grid of the 5th switching transistor M5
Pole is connected with the second scanning signal end Scan2, and the first pole of the 5th switching transistor M5 is connected with data signal end Data, the
The second pole of five switching transistor M5 is extremely connected with the first of driving transistor M0.When the 5th switching transistor M5 is swept second
When retouching conducting under signal end Scan2 controls, data signal end Data is provided by the 5th switching transistor M5 to second node N2
Data-signal.
The grid of 6th switching transistor M6 is connected with third scanning signal end Scan3, and the of the 6th switching transistor M6
One pole is connected with reference signal end Vref, the second pole of the second pole and third switching transistor M3 of the 6th switching transistor M6
It is connected.When the 6th switching transistor M6 is connected under the end Scan3 controls of third scanning signal, reference signal end Vref passes through
6th switching transistor M6 resets the anode of luminescent device oled.
Alternatively, specifically, in pixel circuit provided in an embodiment of the present invention, as shown in figure 4, the 5th switching transistor
The grid of M5 is connected with third scanning signal end Scan3, the first pole and the data signal end Data phases of the 5th switching transistor M5
Even, the second pole of the 5th switching transistor M5 is extremely connected with the first of driving transistor M0.When the 5th switching transistor M5 is
When the lower conducting of three scanning signal end Scan3 controls, data signal end Data is by the 5th switching transistor M5 to second node N2
Data-signal is provided.
The grid of 6th switching transistor M6 is connected with the first scanning signal end Scan1, and the of the 6th switching transistor M6
One pole is connected with reference signal end Vref, the second pole of the second pole and third switching transistor M3 of the 6th switching transistor M6
It is connected.When the 6th switching transistor M6 is connected under the first scanning signal end Scan1 controls, reference signal end Vref passes through
6th switching transistor M6 resets the anode of luminescent device oled.
Relatively single grid structure, double-gate structure has stronger breakdown characteristics, reduces the advantages such as leakage current, therefore, specific
When implementation, either switch transistor can also be arranged to double-gate structure, be not limited thereto.
In the specific implementation, in pixel circuit provided in an embodiment of the present invention, the first pole and the second pole of transistor
In, one is source electrode, another is drain electrode.
In the specific implementation, in display panel provided in an embodiment of the present invention, driving transistor is P-type transistor, right
In driving transistor be N-type transistor the case where, design principle is identical as the present invention, also belongs to the scope of protection of the invention.
In the specific implementation, in display panel provided in an embodiment of the present invention, P may be used in all transistors
Transistor npn npn designs, and can simplify the fabrication processing of pixel circuit in this way.
In the specific implementation, in sequential, the first scanning signal end Scan1, the second scanning signal end Scan2 and third
Scanning signal end Scan3 can export scanning signal.As shown in figure 5, the scanning signal and second of the first scanning signal end Scan1
The scanning signal of scanning signal end Scan2 can exist in sequential to partly overlap, the scanning letter of the second scanning signal end Scan2
It number also partly overlaps in sequential with the scanning signal of third scanning signal end Scan3, the first scanning signal end Scan1's sweeps
Retouching signal, there is no Chong Die in sequential with the scanning signal of third scanning signal end Scan3.And pixel electricity shown in Fig. 1
Road, there are data signal end Vdata to the access of reference signal end Vref, and the electric current on access can flow to luminescent device
Oled makes luminescent device oled shine, not dark to lead to the problem of dark-state.And in pixel provided in an embodiment of the present invention electricity
Road avoids Vdata to the access of Vref or avoids by redesigning connection relation to pixel circuit shown in FIG. 1
Vdata therefore can solve that dark-state existing for Fig. 1 pixel circuits is not dark to ask to the current direction luminescent device of Vref accesses
Topic.
The course of work of pixel circuit provided in an embodiment of the present invention is described with reference to circuit timing diagram.
Example one
By taking pixel circuit shown in Fig. 3 as an example, all switching transistors are P-type transistor, and corresponding input timing is such as
Shown in Fig. 5.Specifically, five stages of T1, T2, T3, T4 and T5 in input timing figure shown in fig. 5 are chosen.
In the T1 stages, only the first scanning signal end Scan1 is low level signal.The M1 conductings of first switch transistor.Only
In the pixel circuit of Fig. 4, first switch transistor M1 resets first node N1.
In the T2 stages, the second scanning signal end Scan2 becomes low level signal.First scanning signal end Scan1 continues one
High level signal is become from low level signal after the section time.5th switching transistor M5 conductings, the signal of data signal end Data
It is transmitted to second node N2, the current potential of second node N2 is Vdata.4th switching transistor M4 and the 7th switching transistor M7
Conducting, driving transistor M0 form diode structure.When the first scanning signal end Scan1 is low level signal, reference signal
Hold the signal transmission of Vref to first node N1, the current potential of first node N1 is Vref.The driving transistor M0 of diode structure
Conducting.When the first scanning signal end Scan1 becomes high level signal, first node N1 is started to charge up, until first node
The current potential of N1 becomes Vdata- | Vth |, driving transistor M0 cut-offs.Vth is the threshold voltage of driving transistor.At this stage
In, there is no electric current that can flow to due to the 6th switching transistor M6 cut-offs to the access of Vref although there are Data
Luminescent device oled, luminescent device oled do not shine.
In the T3 stages, third scanning signal end Scan3 becomes low level signal.Second scanning signal end Scan2 continues one
High level signal is become from low level signal after the section time.6th switching transistor M6 conductings, the signal of reference signal end Vref
It is transmitted to fourth node N4, the current potential of fourth node N4 is Vref, is resetted to the anode of luminescent device oled, photophore
Part oled does not shine.When the second scanning signal end Scan1 is low level signal, the current potential of second node N2 is still kept
The current potential of Vdata, first node N1 still keep Vdata- | Vth |.Become high level signal in the second scanning signal end Scan2
When, under the action of capacitance C1, the current potential of first node N1 still keeps Vdata- | Vth |.In the stage, although reference signal
The signal of end Vref can be transmitted to fourth node N4, but since first switch transistor M1 ends, Data is not present
To the access of Vref, therefore Data will not have an impact Vref, and luminescent device oled is still non-luminous.
In the T4 stages, third scanning signal end Scan3 becomes high level after continuing for some time from low level signal to be believed
Number.When third scanning signal end Scan3 is low level signal, the current potential of fourth node N4 is still Vref.It scans and believes in third
When becoming high level signal, the current potential of first node N1 still keeps Vdata- by number end Scan3 | Vth |, luminescent device oled is still
It is non-luminous.
In the T5 stages, only light emitting control end Emit is low level signal, second switch transistor and third switching transistor
Conducting.The signal transmission of first power voltage terminal VEE is to second node N2, and the current potential of second node N2 becomes VDD, due to electricity
Hold the effect of C1, the current potential of first node N1 is still Vdata- | Vth |, the gate source voltage Vsg=of driving transistor M0 at this time
VDD-Vdata+ | Vth |, the driving current I=K of driving transistor M0 (Vsg- | Vth |)2=K (VDD-Vdata)2=K (VDD-
Vdata+|Vth|-|Vth|)2；The driving luminescent device oled work of driving transistor M0 shines.
Since K is structural parameters, this numerical value is stablized relatively in identical structure, can be regarded as constant.It can be seen that flow direction hair
The threshold voltage that the electric current of optical device oled has been not driven transistor influences, and solves driving transistor due to threshold value electricity
It is influenced caused by pressure drift, so as to improve Display panel inhomogeneities.Also, since there is no the 5th switching transistor, the 7th
The case where switching transistor, the 4th switching transistor, first switch transistor and the 6th switching transistor simultaneously turn on, although
There are Data to Vref accesses, but when there are Data to Vref accesses, reference signal end Vref is off with luminescent device
, ensure that one's own profession luminescent device does not have electric current to flow through, although the signal of one's own profession reference signal end Vref can be by lastrow Data
It influences, but there are on full line electric current, it is smaller to one's own profession Vref pressure drops.By test, dark-state circuit can be dropped by 0.8nit
Down to 0.2nit.It therefore, can the not dark problem of great improved dark state compared with the pixel circuit of Fig. 1.
Example two
By taking pixel circuit shown in Fig. 4 as an example, all switching transistors are P-type transistor, and corresponding input timing is such as
Shown in Fig. 5.Specifically, five stages of T1, T2, T3, T4 and T5 in input timing figure shown in fig. 5 are chosen.
In the T1 stages, only the first scanning signal end Scan1 is low level signal.First switch transistor M1 and the 6th
Switching transistor M6 conductings.Only in the pixel circuit of Fig. 7, first switch transistor M1 resets first node N1.Ginseng
The signal for examining signal end Vref is transmitted to fourth node N4 by the 6th switching transistor M6, and the current potential of fourth node N4 is
Vref resets the anode of luminescent device oled, and luminescent device oled does not shine.
In the T2 stages, the second scanning signal end Scan2 becomes low level signal.First scanning signal end Scan1 continues one
High level signal is become from low level signal after the section time.4th switching transistor M4 and the 7th switching transistor M7 conductings, drive
Dynamic transistor M0 forms diode structure.When the first scanning signal end Scan1 is low level signal, reference signal end Vref
Signal transmission to first node N1, the current potential of first node N1 is Vref.The driving transistor M0 conductings of diode structure.
6th switching transistor M6 conductings, although reference signal end Vref is connected with fourth node N4, due to the 5th switch crystal
Pipe M5 cut-offs, therefore accesses of the Data to Vref is not present, therefore the signal of reference signal end Vref is not by data signal end
The current potential of the influence of Data, fourth node N4 is still Vref, and luminescent device oled will not still shine.At the first scanning signal end
When Scan1 becomes high level signal, in this stage, since capacitance C1 is acted on, the current potential of first node N1 is still Vref.The
Six switching transistor M6 cut-offs, therefore luminescent device oled does not shine still.
In the T3 stages, third scanning signal end Scan3 becomes low level signal.Second scanning signal end Scan2 continues one
High level signal is become from low level signal after the section time.5th switching transistor M5 conductings, the signal of data signal end Data
It is transmitted to second node N2, the current potential of second node N2 is Vdata.It is low level signal in the second scanning signal end Scan1
When, first node N1 is started to charge up, until the current potential of first node N1 becomes Vdata- | Vth |, driving transistor M0 cut-offs.
Vth is the threshold voltage of driving transistor.When the second scanning signal end Scan2 becomes high level signal, the 4th switch crystal
Pipe M4 and the 7th switching transistor M7 cut-offs, under the action of capacitance C1, the current potential of first node N1 still keeps Vdata- |
Vth|.In the stage, since first switch transistor M1 ends, accesses of the Data to Vref is not present, therefore Data is not
Vref can be had an impact, also, the 6th switching transistor M6 is off, therefore luminescent device oled is still non-luminous.
In the T4 stages, third scanning signal end Scan3 becomes high level after continuing for some time from low level signal to be believed
Number.When third scanning signal end Scan3 is low level signal, the current potential of second node N2 is still Vdata, first node N1
Current potential still keep Vdata- | Vth |, luminescent device oled is still non-luminous.Become high in third scanning signal end Scan3
When level signal, the current potential of first node N1 still keeps Vdata- | Vth |.In the stage, since first switch transistor M1 is cut
Only, therefore accesses of the Data to Vref is not present, therefore Data will not have an impact Vref, also, the 6th switching transistor
What M6 was off, therefore luminescent device oled is still non-luminous.
In the T5 stages, only light emitting control end Emit is low level signal, second switch transistor and third switching transistor
Conducting.The signal transmission of first power voltage terminal VEE is to second node N2, and the current potential of second node N2 becomes VDD, due to capacitance
The effect of C1, the current potential of first node N1 are still Vdata- | Vth |, the gate source voltage Vsg=VDD- of driving transistor M0 at this time
Vdata+ | Vth |, the driving current I=K of driving transistor M0 (Vsg- | Vth |)2=K (VDD-Vdata)2=K (VDD-
Vdata+|Vth|-|Vth|)2；The driving luminescent device oled work of driving transistor M0 shines.
Since K is structural parameters, this numerical value is stablized relatively in identical structure, can be regarded as constant.It can be seen that flow direction hair
The threshold voltage that the electric current of optical device oled has been not driven transistor influences, and solves driving transistor due to threshold value electricity
It is influenced caused by pressure drift, so as to improve Display panel inhomogeneities.Also, since there is no the 5th switching transistor, the 7th
The case where switching transistor, the 4th switching transistor, first switch transistor and the 6th switching transistor simultaneously turn on, therefore
There is no Data to the access of Vref, i.e. Data will not have an impact Vref, therefore there is no the not dark problems of dark-state.
Based on same inventive concept, the embodiment of the present invention additionally provides a kind of organic light emitting display panel, as shown in fig. 6,
Including Gaten and N+2 grades of the scan line shifting deposit unit VSRn of N row pixel units PX, N+2, wherein per level-one shift LD
It is the integer more than 0 that unit VSRn, which is correspondingly connected with scan line a Gaten, N,；In Fig. 6 by taking n=1,2,3,4,5 and 6 as an example into
Row signal.
Each pixel unit PX includes above-mentioned pixel circuit provided in an embodiment of the present invention and is connect with each pixel circuit
Luminescent device (not depending on going out in concrete structure Fig. 6 of pixel unit)；
First scanning signal end of the pixel circuit in line n pixel unit PX is connected with nth bar scan line Gaten, the
Second scanning signal end of the pixel circuit in n row pixel units PX is connected with (n+1)th scan line Gaten+1, line n picture
The third scanning signal end of pixel circuit in plain unit PX is connected with the n-th+2 scan line Gaten+2.
Optionally, in organic light emitting display panel provided in an embodiment of the present invention, as shown in fig. 6, further including two rows void
Quasi- pixel unit DPX；
DPX virtual pixel cells include pixel circuit, and the pixel circuit in virtual pixel cell DPX and pixel unit
Image element circuit structure in PX is identical；
The third scanning signal end of the pixel circuit of 1st row virtual pixel cell is connected with the 1st article of scan line；
The third scanning signal end of pixel circuit in 2nd row virtual pixel cell is connected with the 2nd article of scan line, the 2nd row
Second scanning signal end of the pixel circuit in virtual pixel cell be connected with the 1st article of scan line the 2nd article of scan line be connected.
In the specific implementation, the purpose that virtual pixel cell is arranged is in order in the scan line that is connect with pixel unit
Load can be consistent.Since virtual pixel cell does not shine, it is generally not provided with luminescent device in design, or
Luminescent device is set, but luminescent device is not connected to pixel circuit.
Based on same inventive concept, the embodiment of the present invention additionally provides a kind of display device, as shown in fig. 7, comprises this hair
Any of the above-described kind of organic light emitting display panel that bright embodiment provides.The display device can be：Mobile phone, tablet computer, TV
Any product or component with display function such as machine, display, laptop, Digital Frame, navigator.Since this is aobvious
The principle that showing device solves the problems, such as is similar to a kind of aforementioned organic light emitting display panel, therefore the implementation of the display device can be with
Referring to the implementation of aforementioned organic light emitting display panel, overlaps will not be repeated.
A kind of pixel circuit, organic light emitting display panel and display device provided in an embodiment of the present invention, pixel circuit quilt
Three scanning signal end controls, the first scanning signal end, the second scanning signal end and third scanning signal end are to be sequentially output to sweep
Signal is retouched, therefore these three scanning signal ends are not present while exporting the period of scanning signal, it is meant that the present invention is implemented
In the pixel circuit that example provides, there is no the 5th switching transistor, the 7th switching transistor, the 4th switching transistor, first to open
The case where pass transistor and the 6th switching transistor simultaneously turn on, therefore can pass through to the electric current of Vref accesses there is no Data
6th switching transistor flows to luminescent device, to solve the problems, such as that dark-state existing for existing pixel circuit is not dark.
Obviously, various changes and modifications can be made to the invention without departing from the present invention's by those skilled in the art
Spirit and scope.In this way, if these modifications and changes of the present invention belongs to the model of the claims in the present invention and its equivalent technologies
Within enclosing, then the present invention is also intended to include these modifications and variations.
Claims (12)
1. a kind of pixel circuit, which is characterized in that including：Driving transistor, first switch transistor, second switch transistor,
Third switching transistor, the 4th switching transistor, the 5th switching transistor, the 6th switching transistor, the 7th switching transistor and
First capacitance；Wherein,
The first switch transistor by the signal at reference signal end under the control at the first scanning signal end for being supplied to institute
State the first pole of the 4th switching transistor；
The second switch transistor by the signal of power voltage terminal under the control at light emitting control end for being supplied to the drive
First pole of dynamic transistor；
The third switching transistor be used to make under the control at the light emitting control end the second pole of the driving transistor with
Second pole of the third switching transistor is connected；
First pole of the 4th switching transistor and the second pole of the 7th switching transistor are electrically connected in series, for the
The grid for making the driving transistor under the control at two scanning signal ends is connected with the second pole of the driving transistor；
5th switching transistor is for providing the signal of data signal end under the control at second scanning signal end
To the first pole of the driving transistor, the 6th switching transistor is used under the control at third scanning signal end will be described
The signal at reference signal end is supplied to the anode of luminescent device；Alternatively,
5th switching transistor by the signal of data signal end under the control at third scanning signal end for being supplied to institute
The first pole of driving transistor is stated, the 6th switching transistor is used under the control at first scanning signal end will be described
The signal at reference signal end is supplied to the anode of luminescent device；
First capacitance is used to make the voltage difference between the grid of the driving transistor and the power voltage terminal to keep steady
It is fixed；
The driving transistor is used in the second switch transistor, the third switching transistor and first capacitance
Control is lower to provide driving current for the luminescent device.
2. pixel circuit as described in claim 1, which is characterized in that
The grid of the second switch transistor is connected with the light emitting control end, the first pole of the second switch transistor with
The power voltage terminal is connected, and the second pole of the second switch transistor is extremely connected with the first of the driving transistor.
3. pixel circuit as described in claim 1, which is characterized in that
The grid of the third switching transistor is connected with the light emitting control end, the first pole of the third switching transistor with
The second of the driving transistor is extremely connected, the second pole of the third switching transistor and the anode phase of the luminescent device
Even.
4. pixel circuit as described in claim 1, which is characterized in that
The grid of 4th switching transistor is connected with second scanning signal end, and the first of the 4th switching transistor
Pole is connected with the grid of the driving transistor, the second pole of the 7th switching transistor and the second of the driving transistor
Extremely it is connected, the grid of the 7th switching transistor is connected with second scanning signal end.
5. pixel circuit as claimed in claim 4, which is characterized in that
The breadth length ratio of 4th switching transistor is less than the first switch transistor, the second switch transistor, described
Appoint in third switching transistor, the 5th switching transistor, the 6th switching transistor and the 7th switching transistor
The breadth length ratio for a switching transistor of anticipating.
6. pixel circuit as claimed in claim 4, which is characterized in that
The grid of the first switch transistor is connected with first scanning signal end, and the first of the first switch transistor
Pole is connected with the reference signal end, and the second pole of the first switch transistor is connected to the of the 4th switching transistor
Between two poles and the first pole of the 7th switching transistor.
7. pixel circuit as described in claim 1, which is characterized in that
The grid of 5th switching transistor is connected with second scanning signal end, and the first of the 5th switching transistor
Pole is connected with the data signal end, the second pole of the 5th switching transistor and the first pole phase of the driving transistor
Even；
The grid of 6th switching transistor is connected with third scanning signal end, and the first of the 6th switching transistor
Pole is connected with the reference signal end, the second pole of the second pole and the third switching transistor of the 6th switching transistor
It is connected.
8. pixel circuit as described in claim 1, which is characterized in that
The grid of 5th switching transistor is connected with third scanning signal end, and the first of the 5th switching transistor
Pole is connected with the data signal end, the second pole of the 5th switching transistor and the first pole phase of the driving transistor
Even；
The grid of 6th switching transistor is connected with first scanning signal end, and the first of the 6th switching transistor
Pole is connected with the reference signal end, the second pole of the second pole and the third switching transistor of the 6th switching transistor
It is connected.
9. such as claim 1-8 any one of them pixel circuits, which is characterized in that all transistors are P-type crystal
Pipe.
10. a kind of organic light emitting display panel, which is characterized in that including N rows pixel unit, N+2 scan line and N+2 grades of displacements
Deposit unit, wherein shifting deposit unit described in per level-one is correspondingly connected with a scan line, N is the integer more than 0；
The pixel unit include as described in claim 1-9 any one of them pixel circuit and with each pixel circuit
The luminescent device of connection；
First scanning signal end of the pixel circuit in line n pixel unit is connected with nth bar scan line, line n pixel unit
In the second scanning signal end of pixel circuit be connected with (n+1)th scan line, of the pixel circuit in line n pixel unit
Three scanning signal ends are connected with the n-th+2 scan lines.
11. organic light emitting display panel as claimed in claim 10, which is characterized in that further include two row virtual pixel cells；
The virtual pixel cell includes pixel circuit, and the pixel circuit in the virtual pixel cell and the pixel unit
In image element circuit structure it is identical；
The third scanning signal end of the pixel circuit of virtual pixel cell described in 1st row is connected with the 1st article of scan line；
The third scanning signal end of pixel circuit in virtual pixel cell described in 2nd row is connected with the 2nd article of scan line, the 2nd row
Second scanning signal end of the pixel circuit in the virtual pixel cell is connected the 2nd article of scan line with the 1st article of scan line
It is connected.
12. a kind of display device, which is characterized in that include the organic light emitting display panel as described in claim 10 or 11.
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| CN111816119A (en) * | 2020-08-31 | 2020-10-23 | 上海天马有机发光显示技术有限公司 | Display panel and display device |
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