CN106157895B - A kind of organic light emitting display panel and its driving method - Google Patents
A kind of organic light emitting display panel and its driving method Download PDFInfo
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- CN106157895B CN106157895B CN201610518880.0A CN201610518880A CN106157895B CN 106157895 B CN106157895 B CN 106157895B CN 201610518880 A CN201610518880 A CN 201610518880A CN 106157895 B CN106157895 B CN 106157895B
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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
-
- G—PHYSICS
- G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
- G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
- G09G2310/00—Command of the display device
- G09G2310/02—Addressing, scanning or driving the display screen or processing steps related thereto
- G09G2310/0264—Details of driving circuits
Abstract
The present invention describes a kind of organic light emitting display panel and its driving method.Organic light emitting display panel includes at least one first circuit and multiple second circuits；A plurality of reference voltage line and multiple data lines；First circuit includes signal generating unit, signal input control unit, signal detection unit；The second circuit includes the first transistor；First circuit carries out initialization to the first transistor by the reference voltage line and threshold value is detected, and first circuit carries out threshold compensation to the first transistor by the data line.Organic light emitting display panel provided by the invention and its driving method are able to solve Organic Light Emitting Diode during threshold voltage shift causes display is uneven, solves threshold value to detect and steal the problems such as bright, organic light emitting display panel provided by the invention and its driving method can be used in VR and show simultaneously, sunset glow can be reduced, VR dizziness problem is improved.
Description
Technical field
The present invention relates to display fields, more particularly to a kind of organic light emitting display panel and its driving method.
Background technique
In recent years, people develop the various light-weight and small flat panel display equipment of size to replace cathode-ray tube.This
The example of a little flat panel display equipments includes liquid crystal display panel, plasma display panel and electroluminescence display panel.Wherein,
Electroluminescence display panel realizes the normal display of display panel by the electroluminescent device in display panel, according to luminescent layer
The difference of material, electroluminescent device are divided into two class of inorganic light-emitting and organic light emission, because organic luminescent device has high response
Speed, high-luminous-efficiency, Qiang Liangdu and wide viewing angle and display technology of new generation is known as by industry.
As a kind of current-control type luminescent device, the uniformity of luminance of organic light emitting display panel and control are each luminous
The electric current of unit is closely related.Generally, the corresponding pixel circuit of a pixel unit, but as narrow frame and high-resolution are aobvious
The development shown, several pixel units can also share a pixel circuit.Which kind of but no matter set using above-mentioned pixel circuit
Meter, the defects of during actual displayed due to technique and thin film transistor (TFT) aging, there is always drives for organic light emitting display panel
The problem of dynamic transistor threshold voltage drifts about and leads to luminance nonuniformity.Currently, on solving the problems, such as threshold voltage shift, panel factory
Quotient generallys use two ways: first is that increasing compensating unit inside pixel circuit by internal compensation mode, in light emitting phase
Before first pass through itself circuit carry out threshold value crawl；Second is that compensating unit is increased outside pixel circuit by external compensation mode,
External circuit is first passed through before light emitting phase carries out threshold value crawl.Relative interior compensation, the structure of external compensation are simple and adjustable
Control property is strong, designs conducive to the high-resolution of display panel.Therefore, in recent years the mode of external compensation increasingly by panel vendor
Favor.
Figure 1A is a kind of external compensation pixel circuit figure that the prior art provides.As shown in Figure 1A, pixel circuit includes the
One transistor T1, second transistor T2, third transistor T3, capacitor Cst and Organic Light Emitting Diode D.Wherein, first crystal
The grid of pipe T1 connect with the first scan line SCAN1, the first pole by data line L1 be connected to external circuit 011, the second pole with
First node Q1 connection, the grid of second transistor T2 is connect with first node Q1, the first pole is connect with the first constant pressure source VDD,
Second pole is connect with second node Q2, the grid of third transistor T3 connect with the second scan line SCAN2, the first pole by reference to
Pressure-wire L2 is connected to external circuit 011, and the anode of Organic Light Emitting Diode D is connect with second node Q2, cathode and the second perseverance
Potential source VSS connection.
In figure 1A, the first transistor T1~third transistor T3 is NMOS tube.Figure 1B is external compensation shown in Figure 1A
The driver' s timing figure of circuit realization threshold compensation.
Specifically, in the first moment t1: high level signal is provided to the first scan line SCAN1, the second scan line SCAN2,
Vdata and Vref are provided respectively to data line L1, reference signal line L2.In the first scan line SCAN1, the second scan line SCAN2
Under high level signal control, the first transistor T1, third transistor T3 conducting, first crystal of the Vdata through data line L1, conducting
Pipe T1 is transmitted to first node Q1, and Vref is transmitted to second node Q2 through the third transistor T3 of reference voltage line L2, conducting.Cause
This, at the t1 moment, the current potential of first node Q1 is Vdata, the current potential of second node Q2 is Vref, and first capacitor Cst charges
To second transistor T2 threshold voltage vt h (Vdata-Vref > Vth) to drive second transistor T2.
In the second moment t2, high level signal is provided to the first scan line SCAN1, is provided to the second scan line SCAN2 low
Level signal provides Vdata and Vref to data line L1, reference voltage line L2 respectively.At this point, the first transistor T1 conducting, the
Three transistor T3 cut-off, the first transistor T1 of the Vdata by data line L1, conducting are transmitted to first node Q1.Due to
The cut-off of two moment t2 third transistor T3, therefore, Vpre cannot be transmitted to second node Q2 by reference to pressure-wire L2.In t2
It carves, first node Q1, second node Q2 keep the current potential of last moment.Exist to the reference voltage line L2 purpose being pre-charged
In in order to reduce the influence that the parasitic capacitance on reference voltage line L2 works to subsequent time.
In third moment t3, high level signal is provided to the first scan line SCAN1, the second scan line SCAN2, to data line
L1 provides data-signal Vdata.At this point, since first node Q1, second node Q2 still maintain the current potential of last moment respectively
Vdata, Vref, and Vdata-Vref > Vth, therefore second transistor T2 is connected.Second transistor of the pixel current through being connected
T2, third transistor T3 are transmitted to reference voltage line L2, the voltage of reference voltage line L2 since pre-charge voltage Vpre according to
It is increased in proportion to the pixel current of driving second transistor T2, until the current potential of second node Q2 becomes (Vdata-Vth),
Voltage on reference voltage line L2 reaches saturation.
In the 4th moment t4, low level signal is provided to the first scan line SCAN1, the second scan line SCAN2.At this point, outer
Portion's circuit samples the saturation voltage Vdata-Vth on reference voltage line L2, and sampled voltage is exported as sensing voltage
Thus Vsensing senses the voltage directly proportional to the pixel current of second transistor T2.It is calculated using Vsensing corresponding
The pixel current of the driving second transistor T2 of pixel, due between pixel current and the threshold voltage and pixel of second transistor T2
Mobility deviation (the ratio between respective pixel and the mobility of reference pixel) Cheng Yiding functional relation, therefore, according to
The mobility that the pixel current that Vsensing is calculated can detecte out between the threshold voltage and pixel of second transistor T2 is inclined
Difference, to obtain the deviant for compensating detected threshold voltage and the yield value for compensating mobility deviation to make
For offset, and the offset is stored in external circuit 011 in the form of a lookup table.
To sum up, pixel circuit completes the threshold compensation of pixel.When displayed, external circuit is according to each pixel of storage
Deviation and yield value offset data voltage.
But during external compensation circuit shown in figure 1A carries out threshold compensation, at t1, t2 moment due to the second crystalline substance
Body pipe T2 conducting, it is bright to have that Organic Light Emitting Diode D is stolen；Meanwhile by the secondary write-in data voltage of external compensation
VdataWhen, it is respectively to first node Q1 and second node Q2 write potential, since second transistor T2 at this time is because of first
Node Q1 is opened there are current potential, and the electric signal of the first constant pressure source VDD input is transmitted to second node by second transistor T2
Q2, i.e., at this moment, second node Q2 are written into the electric potential signal and V of the first constant pressure source VDD simultaneouslyref, therefore not can guarantee
The current potential of second node Q2 is written into ideal potential.
Summary of the invention
In view of this, on the one hand, the present invention provides a kind of organic light emitting display panel, including
At least one first circuit and multiple second circuits；A plurality of reference voltage line and multiple data lines；First electricity
Road includes signal generating unit, signal input control unit, signal detection unit；The second circuit includes the first transistor,
First circuit carries out initialization to the first transistor by the reference voltage line and threshold value is detected, first electricity
Road carries out threshold compensation to the first transistor by the data line.
On the other hand, the present invention provides a kind of method for driving above-mentioned organic light emitting display panel, including the first moment,
Two moment, third moment and the 4th moment, in which: at first moment, the signal generating unit is by described with reference to electricity
Crimping transmits reference voltage signal, initializes to the grid of the first transistor；At second moment, to described
The threshold value of one transistor is detected and is acquired, and collected threshold voltage is transmitted to signal generating unit；Described
Three moment, the signal generating unit are transferred through compensated data-signal by data line, to the first transistor into
Row threshold compensation；At the 4th moment, the organic light emitting display panel conducting shines.
On the other hand, the present invention provides another method for driving above-mentioned organic light emitting display panel, the driving method
Including first stage and second stage:
In the first stage, Xiang Suoshu the second voltage source provides high level signal, in the organic light emitting display panel
All pixels unit complete initialization, threshold value detecting with threshold compensation process；
In the second stage, Xiang Suoshu the second voltage source provides low level signal, in the organic light emitting display panel
All pixels unit conducting shine.
Compared with prior art, the present invention at least has the advantages that one of prominent as follows:
Organic light emitting display panel provided by the invention and its driving method are able to solve threshold voltage shift and cause to show
Uneven problem；
Organic light emitting display panel provided by the invention and its driving method are able to solve organic hair during threshold value detecting
Optical diode steals bright problem；
Organic light emitting display panel provided by the invention and its driving method can be used in VR and show, can reduce sunset glow,
Improve VR dizziness problem.
Detailed description of the invention
Figure 1A is a kind of external compensation pixel circuit figure that the prior art provides；
Figure 1B is the driver' s timing figure that external compensation circuit shown in Figure 1A realizes threshold compensation；
Fig. 2A is a kind of organic light emitting display panel provided by the invention；
Fig. 2 B is provided by the invention a kind of for driving the circuit embodiments that pixel unit works in Fig. 2A；
Fig. 3 is a kind of driving method for driving circuit shown in Fig. 2 B；
Fig. 4 is another circuit embodiments for being used to that pixel unit in Fig. 2A to be driven to work provided by the invention；
Fig. 5 is the timing diagram for driving circuit as shown in Figure 4；
Fig. 6 is a kind of organic light emitting display panel connected mode schematic diagram provided by the invention；
Fig. 7 is another organic light emitting display panel connected mode schematic diagram provided by the invention.
Specific embodiment
To make the above purposes, features and advantages of the invention more obvious and understandable, below in conjunction with attached drawing and implementation
The present invention will be further described for example.
It should be noted that elaborating detail in the following description to fully understand the present invention.But this hair
Bright to be different from other way described herein with a variety of and be implemented, those skilled in the art can be without prejudice in the present invention
Similar popularization is done in the case where culvert.Therefore the present invention is not limited by following public specific embodiment.
Fig. 2A is a kind of organic light emitting display panel embodiment provided by the invention.As shown in Figure 2 A, organic light emitting display
Panel 1 includes viewing area 100 and non-display area 200, wherein includes a plurality of scan line SL extended in X direction in viewing area 100
With a plurality of data line DL extended along Y-direction, and the multiple pixel units 11 limited are intersected by scan line SL and data line DL,
Wherein X-direction is mutually perpendicular to Y-direction.
Fig. 2 B is for driving the electrical block diagram that each pixel unit 11 works in Fig. 2A.First circuit 10 includes
Signal generating unit 101, signal input control unit 102, signal detection unit 103.Specifically, as shown in Figure 2 B, signal is defeated
Entering control unit 102 includes second transistor M2, and signal detection unit 103 includes third transistor M3, comparator CM, the first electricity
Hold C1；Second circuit 20 includes the first transistor M1, the 4th transistor M4, the 5th transistor M5, the 6th transistor M6, the 7th crystalline substance
Body pipe M7, the second capacitor C2 and Organic Light Emitting Diode EL.
Wherein, the grid of second transistor M2 is connect with the first control line CT1, the first pole and signal generating unit 101 connect
It connects, the second pole is by reference to pressure-wire LrefIt is connect with the first pole of the 4th transistor M4 in second circuit 20；Third transistor M3
Grid connect with the second control line CT2, the first pole is by reference to pressure-wire LrefWith the 4th transistor M4 in second circuit 20
The connection of first pole, the second pole are connect with the first input end R of comparator CM；The the second input terminal S and first voltage of comparator CM
Source PVDD connection, output end T are connect with signal generating unit 101；The grid of 4th transistor M4 connect with the first scan line S1,
First pole and reference voltage line LrefConnection, the second pole are connect with first node N1；The grid and first node of the first transistor M1
N1 connection, the first pole are connect with first voltage source PVDD, the second pole is connect with second node N2；The grid of 5th transistor M5 with
Second scan line S2 connection, the first pole is connect with first node N1, the second pole is connect with second node N2；6th transistor M6's
Grid is connect with third scan line S3, the first pole is connect with first node N1, the second pole is single by data line DL and signal generation
Member 101 connects；The grid of 7th transistor M7 is connect with third control line CT3, the first pole is connect with second node N2, the second pole
It is connect with the anode of Organic Light Emitting Diode EL；The first end of second capacitor C2 connect with first node N1, second end and first
Voltage source PVDD connection.
Pixel circuit shown in Fig. 2 B can effectively solve the problem that problem, the threshold compensation that threshold voltage shift causes display uneven
Organic Light Emitting Diode steals what node potential during bright problem, threshold compensation can not accurately be written in pixel unit in the process
Problem.
Further describe how pixel circuit provided in this embodiment realizes above-mentioned technology below in conjunction with specific driving method
Effect.Fig. 3 is the driving method of circuit shown in a kind of driving Fig. 2 B provided in this embodiment.It should be noted that the present embodiment
The first transistor M1 to the 6th transistor M6 of offer is PMOS tube, i.e., entire circuit is the circuit that pure PMOS is constituted；Certainly,
Entire circuit may be the circuit that pure NMOS is constituted, then drive the timing of the pure NMOS circuit just with it is shown in Fig. 3 when
Sequence mutually overturns.In the present embodiment, only by taking entire circuit is the circuit that pure PMOS is constituted as an example, driving side as shown in connection with fig. 3
Method illustrates the work process of circuit.It should be noted that the voltage PVDD that first voltage source provides in the present embodiment is constant
High level voltage, the second voltage source provide voltage PVEE be constant low level voltage.
Specifically, at the P1 moment, the first level signal is provided to the first scan line S1, the first control line CT1, is swept to second
It retouches line S2, third scan line S3, the second control line CT2, third control line CT3 and second electrical level signal is provided.At this point, being swept first
It retouches under line S1, the control of the first control line CT1 low level signal, second transistor M2, the 4th transistor M4 conducting.Meanwhile signal
Generating unit 101 transmits reference voltage signal Vref.Therefore, at the P1 moment, the voltage of first node N1 is Vref, to first crystal
The grid of pipe M1 is initialized.Since the 7th transistor M7 ends under the control of third control line CT3 high level signal at this time,
Organic Light Emitting Diode EL can not shine.Therefore, the circuit provided in this embodiment for driving pixel unit to work is to drive
Dynamic transistor (the first transistor M1) will not be led to the problem of when being initialized Organic Light Emitting Diode steal it is bright.
At the P2 moment, the first level signal is provided to the first scan line S1, the second scan line S2, the second control line CT2, to
Third scan line S3, the first control line CT1, third control line CT3 provide second electrical level signal.At this point, the first scan line S1,
Under second scan line S2, the control of the second control line CT2 low level signal, third transistor M3, the 4th transistor M4, the 5th crystal
Pipe M5 conducting, while the first transistor M1 is connected after the initialization by last moment at this moment.Therefore, first voltage
The first transistor M1, fiveth transistor M5 of the first voltage PVDD through being connected that source PVDD is generated are transmitted to first node N1, lead
The current potential of first node N1 is caused constantly to increase, when the current potential of first node N1 is increased to PVDD-VthWhen the first transistor M1 end.
Since the 4th transistor M4, third transistor M3 are connected at this time, the current potential of N1 node is by reference to pressure-wire L at this timeref、
The 4th transistor M4, the third transistor M3 of conducting are transmitted to the first end R of comparator CM, after comparator CM, by VthValue
It is transferred to signal generating unit 101.Since the 7th transistor M7 is cut under the control of third control line CT3 high level signal at this time
Only, the voltage PVDD that first voltage source provides can not be transferred to the anode of Organic Light Emitting Diode EL, Organic Light Emitting Diode EL
It can not shine.Therefore, the circuit provided in this embodiment for driving pixel unit to work is to driving transistor (first crystal
Pipe M1) will not lead to the problem of when being initialized Organic Light Emitting Diode steal it is bright.
In order to make it easy to understand, the present invention illustrates the working principle of comparator CM at this.As shown in Figure 2 B, comparator
CM includes first end R, second end S and third end T, and wherein the end R is reverse input end, the end S is noninverting input, T is output end.
At the P2 moment, the end R connects the voltage PVDD-V of third transistor M3 outputth, the end S connection first voltage source PVDD generate first
Voltage PVDD, then output end T exports the difference V at the end R and the end Sth, and by VthIt is transferred to signal generating unit 101.
At the P3 moment, provide the first level signal to third scan line S3, to the first scan line S1, the second scan line S2,
First control line CT1, the second control line CT2, third control line CT3 provide second electrical level signal.At this point, in third scan line S3
Under low level signal control, the 6th transistor M6 conducting.The threshold voltage V that signal generating unit 101 obtains the P2 momentthIt carries out
Calculation processing passes through data line DL output voltage Vdata+VthTo the first transistor M1 grid and be stored in the second capacitor C2,
Complete the threshold compensation to the first transistor M1.
At the P4 moment, provide the first level signal to third control line CT3, to the first scan line S1, the second scan line S2,
Third scan line S3, the first control line CT1, the second control line CT2 provide second electrical level signal.At this point, in third control line CT3
Low level signal controls lower 7th transistor M7 conducting, while the first transistor M1 is herein after the threshold compensation of last moment
Carve conducting.Therefore, the first transistor M1, seventh crystal of the voltage PVDD that P4 moment first voltage source PVDD is generated by conducting
Pipe M7 is transferred to the anode of Organic Light Emitting Diode EL, anode voltage PVDD, cathode voltage PVEE driving under organic light emission
Diode EL shines.Glow current I=k (Vdata-PVDD)2, k indicate by driving transistor (the first transistor M1) mobility
The constant determined with parasitic capacitance.
The circuit in conjunction with shown in Fig. 2 B and driving method shown in Fig. 3, it can be seen that organic light emission provided in this embodiment
Display panel can effectively solve the problem that threshold voltage shift causes organic light-emitting diodes during the problem of display unevenness, threshold compensation
Manage the problem of node potential can not accurately be written during stealing bright problem, threshold compensation.
Fig. 4 is provided by the invention another for driving the circuit embodiments of each pixel unit in Fig. 2A.With Fig. 2 B institute
Show that the difference of circuit is, the not set 7th transistor M7 of second circuit 20 in circuit shown in Fig. 4.Fig. 5 is for driving such as Fig. 4
The timing diagram of shown circuit, the difference with driving method shown in Fig. 3 are that driving method shown in fig. 5 includes first stage K1
With second stage K2, the voltage PVEE that K1 the second voltage source provides in the first stage is high level voltage, in second stage K2 the
The voltage PVEE that two voltage sources provide is low level voltage.Wherein, all pixels list in K1 stage organic light emitting display panel
Member completes initialization, threshold value detecting and threshold compensation process, all pixels unit hair in K2 stage organic light emitting display panel
Light.Its corresponding timing is first complete to all pixels unit in organic light emitting display panel in circuit and Fig. 5 i.e. shown in Fig. 4
At threshold compensation process, then all pixels unit is further risen luminous.Designing in this way is advantageous in that, is applying this organic hair
Sunset glow can be reduced in the virtual reality device (Visual Reality, VR) of light display panel, improve VR dizziness problem.
It specifically, include first stage K1 and second stage K2 in the scanning process of any one frame.First stage K1 packet
Include 3m moment (k11、k12、k13、k21、k22、k23、…、ki1、ki2、ki3、…、km1、km2、km3), m is organic light emitting display panel
The line number of pixel unit.Wherein, in k11、k12、k13Moment is respectively completed the initialization of the first row pixel unit 11, threshold value detecting
With threshold compensation process, in k21、k22、k23Moment is respectively completed the initialization of the second row pixel unit 11, threshold value detecting and threshold value
Compensation process ... ..., and so on, in ki1、ki2、ki3Moment is respectively completed the initialization of the i-th row pixel unit 11, threshold value is detectd
It surveys and threshold compensation process.Due to the initialization of every row pixel unit, threshold value detecting it is identical with threshold compensation process, below only with
Initialization, threshold value detecting and the threshold compensation process example of the first row pixel unit illustrate the specific works of every row pixel unit
Engineering.For convenience of description, the first scan line of the i-th row pixel unit will be controlled below labeled as Si1, the second scan line Si2, the
Three scan line Si3, the first control line are CTi1, the second control line CTi2, such as the first scanning that will control the 1st row pixel unit
Wire tag is S11, the second scan line S12, third scan line S13, the first control line are CT11, the second control line CT12.
In k11Moment, to the first scan line S1, the first control line CT1 provide the first level signal, to the second scan line S2,
Third scan line S3, the second control line CT2 provide second electrical level signal.At this point, in the first scan line S1, the first control line CT1
Under low level signal control, second transistor M2, the 4th transistor M4 conducting.Meanwhile the transmission of signal generating unit 101 is with reference to electricity
Press signal Vref.Therefore, in k11The voltage of moment first node N1 is Vref, the grid of the first transistor M1 is initialized.
Since the level that the second voltage source PVEE is provided at this time is high level, even if the voltage PVDD warp that first voltage source provides
It, will not be in the both ends shape of Organic Light Emitting Diode when the first transistor M1 of conducting is transferred to Organic Light Emitting Diode EL anode
At the driving voltage of driving organic light-emitting diode.I.e. the present embodiment carries out just driving transistor (the first transistor M1)
Will not be led to the problem of when beginningization Organic Light Emitting Diode steal it is bright.
In k12Moment provides the first level signal to the first scan line S1, the second scan line S2, the second control line CT2, to
Third scan line S3, the first control line CT1 provide second electrical level signal.At this point, the first scan line S1, the second scan line S2,
Under the control of second control line CT2 low level signal, third transistor M3, the 4th transistor M4, the 5th transistor M5 conducting, simultaneously
The first transistor M1 is connected after the initialization by last moment at this moment.Therefore, first voltage source PVDD is generated
The first transistor M1, fiveth transistor M5 of the first voltage PVDD through being connected are transmitted to first node N1, lead to first node N1
Current potential constantly increase, when the current potential of first node N1 is increased to PVDD-VthWhen the first transistor M1 end.Due at this time the 4th
Transistor M4, third transistor M3 conducting, therefore, the current potential of N1 node is by reference to pressure-wire L at this timeref, conducting it is the 4th brilliant
Body pipe M4, third transistor M3 are transmitted to the first end R of comparator CM, after comparator CM, by VthValue is transferred to signal hair
Raw unit 101.Because in k12Moment, the level that the second voltage source PVEE is provided remain high level, therefore, the mistake of threshold acquisition
Even if there is the anode of PVDD voltage transmission to Organic Light Emitting Diode EL in journey, the both ends of Organic Light Emitting Diode will not be formed
Drive the driving voltage of organic light-emitting diode.I.e. the present embodiment carries out threshold value to driving transistor (the first transistor M1)
Will not be led to the problem of when detecting Organic Light Emitting Diode steal it is bright.
In k13Moment, to third scan line S3 provide the first level signal, to the first scan line S1, the second scan line S2,
First control line CT1, the second control line CT2 provide second electrical level signal.At this point, being controlled in third scan line S3 low level signal
Under, the 6th transistor M6 conducting.Signal generating unit 101 is to k12The threshold voltage V that moment obtainsthCalculation processing is carried out, is passed through
Data line DL output voltage Vdata+VthTo the first transistor M1 grid and be stored in the second capacitor C2, complete to first crystalline substance
The threshold compensation of body pipe M1.
As the above analysis, in k11、k12、k13Moment, since the voltage PVEE of the second voltage source remains constant height
Level, Organic Light Emitting Diode both ends cannot form sufficiently large driving voltage, to efficiently avoid initialization, threshold value is adopted
Organic Light Emitting Diode steals bright problem during collection.
K is completed in the first row pixel unit11、k12、k13After process, the second row pixel unit starts to carry out k11、k12、k13,
And so on, until m row pixel unit completes km1、km2、km3Process, K1 stage terminate.I.e. in organic light emitting display panel
All pixels unit completes threshold compensation.
After the K1 stage terminates, organic light emitting display panel enters the K2 stage.In the K2 stage, the voltage of the second voltage source
PVEE is become the low level in K2 stage from the high level in K1 stage.Therefore, all organic light emissions on the K2 stage, display panel
LED lighting.Glow current I=k (Vdata-PVDD)2, k indicate by driving transistor (the first transistor M1) mobility and
The constant that parasitic capacitance determines.Simultaneously as the holding of the second capacitor C2 acts on, first node N1 current potential is constant, so shining
The glow current in stage can remain unchanged, and guarantee the uniformity of luminance of light emitting phase.
As above it analyzes, its corresponding timing is first to institute in organic light emitting display panel in circuit and Fig. 5 shown in Fig. 4
There is pixel unit to complete threshold compensation process, then all pixels unit further rises luminous.The organic of circuit shown in Fig. 4 will be contained
When light emitting display panel is in virtual reality device, sunset glow is generated when can reduce virtual reality device use, and it is dizzy to improve VR
The problems such as dizzy.
It should be noted that being correspondingly arranged in each pixel unit 11 in organic light emitting display panel 1 provided by the invention
One second circuit 20, but do not limit first circuit 10 will be set in each pixel unit 11, i.e., it is provided by the invention
The connection of first circuit and second circuit is not limited to one-to-one connection type.
Fig. 6 is a kind of organic light emitting display panel connected mode schematic diagram provided by the invention.As shown in fig. 6, being located at same
The second circuit 20 of one column passes through a reference voltage line LrefIt is connected to first circuit 10, and is located at the second of different lines
Circuit passes through different reference voltage line LrefIt is connected to the first different circuits 10.Connection type i.e. shown in fig. 6 is positioned at same
The second circuit 20 of one column shares first circuit 10.Designing in this way is advantageous in that, can freely select to some
Pixel unit carries out threshold value detecting and compensation.Therefore this in the case where carrying out threshold compensation to some region of display panel
The problem of design can be to avoid compensating to the pixel unit for not needing threshold value detecting and threshold compensation and greatly increasing energy consumption.
Fig. 7 is another organic light emitting display panel connected mode schematic diagram provided by the invention.As shown in fig. 7, being located at
The second circuit 20 of same row passes through a reference voltage line LrefIt is connected to first circuit 10, and is located at the of different lines
Two circuits pass through different reference voltage line LrefIt is connected to same first circuit 10.Designing in this way is advantageous in that, Ke Yijie
Technique and panel space are saved, convenient for the realization of narrow frame and high-resolution display.
It should be noted that first circuit is located at non-display area in organic light emitting display panel provided by the invention.
It should be noted that the signal generating unit of first circuit is collection in organic light emitting display panel provided by the invention
At IC circuit.
The above content is a further detailed description of the present invention in conjunction with specific preferred embodiments, and it cannot be said that
Specific implementation of the invention is only limited to these instructions.For those of ordinary skill in the art to which the present invention belongs, exist
Under the premise of not departing from present inventive concept, a number of simple deductions or replacements can also be made, all shall be regarded as belonging to of the invention
Protection scope.
Claims (9)
1. a kind of organic light emitting display panel, comprising:
At least one first circuit and multiple second circuits；
A plurality of reference voltage line and multiple data lines；
First circuit includes signal generating unit, signal input control unit, signal detection unit；
The second circuit includes the first transistor；
First circuit carries out initialization to the first transistor by the reference voltage line and threshold value is detected, and described the
One circuit carries out threshold compensation to the first transistor by the data line.
2. organic light emitting display panel as described in claim 1, which is characterized in that positioned at the multiple second electricity of same row
Road is electrically connected by a reference voltage line with a second circuit.
3. organic light emitting display panel as described in claim 1, which is characterized in that the signal input control unit includes the
Two-transistor, the grid of the second transistor is connect with the first control line, the first pole is connect with the signal generating unit,
Two poles are connect with the reference voltage line；The signal detection unit includes third transistor, comparator, first capacitor, wherein
The grid of the third transistor is connect with the second control line, the first pole is connect with the reference voltage line, the second pole with it is described
The first end of comparator connects, and the first end of the first capacitor is connect with the first pole of the third transistor, second terminates
One constant potential, the second end of the comparator is connect with first voltage source, third end is connect with the signal generating unit.
4. organic light emitting display panel as claimed in claim 3, which is characterized in that the second circuit further includes the 4th crystal
Pipe, the 5th transistor, the 6th transistor, the 7th transistor, the second capacitor and Organic Light Emitting Diode；Wherein, the described 4th
The grid of transistor is connect with the first scan line, the first pole is connect with the reference voltage line, the second pole is connect with first node；
The grid of the first transistor is connect with the first node, the first pole is connect with the first voltage source, the second pole and the
The connection of two nodes；The grid of 5th transistor is connect with the second scan line, the first pole is connect with the first node, second
Pole is connect with the second node, and the grid of the 6th transistor is connect with third scan line, the first pole is connect with data line,
And the signal generating unit is connected to by data line, the second pole is connect with the first node, the 7th transistor
Grid is connect with third control line, the first pole is connect with the second node, the sun of the second pole and the Organic Light Emitting Diode
Pole connection, the first end of second capacitor is connect with the first node, second end is connect with the first voltage source, described
The cathode of Organic Light Emitting Diode is connect with the second voltage source.
5. organic light emitting display panel as claimed in claim 3, which is characterized in that the second circuit further includes the 4th crystal
Pipe, the 5th transistor, the 6th transistor, the second capacitor and Organic Light Emitting Diode；Wherein, the grid of the 4th transistor
It is connect with the first scan line, the first pole is connect with the reference voltage line, the second pole is connect with first node；The first crystal
The grid of pipe is connect with the first node, the first pole is connect with the first voltage source, the second pole is connect with second node；Institute
The grid for stating the 5th transistor is connect with the second scan line, the first pole is connect with the first node, the second pole and described second
Node connection, the grid of the 6th transistor is connect with third scan line, the first pole is connect with data line, and passes through data line
It is connected to the signal generating unit, the second pole is connect with the first node, the first end of second capacitor and described the
The connection of one node, second end are connect with the first voltage source, and the cathode and the second voltage source of the Organic Light Emitting Diode connect
It connects.
6. organic light emitting display panel as described in claim 1, the signal generating unit is Integrated circuit IC.
7. a kind of driving method for organic light emitting display panel as claimed in claim 4, which is characterized in that each pixel list
The course of work of member includes the first moment, the second moment, third moment and the 4th moment, in which:
At first moment, the first scan line of Xiang Suoshu, the first control line provide the first level signal, and Xiang Suoshu second is scanned
Line, third scan line, the second control line, third control line provide second electrical level signal, and the signal generating unit passes through described
Reference voltage line transmits reference voltage signal, initializes to the grid of the first transistor；
At second moment, the first scan line of Xiang Suoshu, the second scan line, the second control line provide the first level letter
Number, Xiang Suoshu third scan line, the first control line, third control line provide the second electrical level signal, to the first crystal
The threshold value of pipe is detected and is acquired, and collected threshold voltage is transmitted to signal generating unit；
At the third moment, Xiang Suoshu third scan line provides first level signal, the first scan line of Xiang Suoshu, second
Scan line, the first control line, the second control line, third control line provide the second electrical level signal, the signal generating unit
It is transferred through compensated data-signal by data line, threshold compensation is carried out to the first transistor；
At the 4th moment, Xiang Suoshu third control line provides first level signal, the first scan line of Xiang Suoshu, second
Scan line, third scan line, the first control line, the second control line provide the second electrical level signal, the pixel unit conducting
It shines.
8. a kind of driving method for organic light emitting display panel as claimed in claim 5, which is characterized in that the driving side
Method includes first stage and second stage:
In the first stage, the second voltage source provides high level signal, all in the organic light emitting display panel
Pixel unit completes initialization, threshold value detecting and threshold compensation process；
In the second stage, the second voltage source provides low level signal, all in the organic light emitting display panel
Pixel unit conducting shines.
9. the driving method of organic light emitting display panel as claimed in claim 8, which is characterized in that in the first stage, often
The course of work of a pixel unit includes the first moment, the second moment and third moment:
At first moment, the first scan line of Xiang Suoshu, the first control line provide the first level signal, and Xiang Suoshu second is scanned
Line, third scan line, the second control line provide second electrical level signal, and the signal generating unit is passed by the reference voltage line
Defeated reference voltage signal initializes the grid of the first transistor；
At second moment, the first scan line of Xiang Suoshu, the second scan line, the second control line provide the first level letter
Number, Xiang Suoshu third scan line, the first control line provide the second electrical level signal, carry out to the threshold value of the first transistor
Detecting and acquisition, and collected threshold voltage is transmitted to signal generating unit；
At the third moment, Xiang Suoshu third scan line provides first level signal, the first scan line of Xiang Suoshu, second
Scan line, the first control line, the second control line provide the second electrical level signal, and the signal generating unit is passed by data line
It is defeated to pass through compensated data-signal, threshold compensation is carried out to the first transistor.
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| CN106531084B (en) * | 2017-01-05 | 2019-02-05 | 上海天马有机发光显示技术有限公司 | Organic light emitting display panel and its driving method, organic light-emitting display device |
| CN107038996B (en) * | 2017-04-24 | 2019-08-02 | 上海天马有机发光显示技术有限公司 | A kind of method of supplying power to and display device of organic electroluminescent display panel |
| CN109427298B (en) * | 2017-08-21 | 2020-04-17 | 京东方科技集团股份有限公司 | Display driving method and display device |
| US10283051B2 (en) | 2017-09-06 | 2019-05-07 | Shenzhen China Star Optoelectronics Semiconductor Display Technology Co., Ltd. | OLED pixel driving circuit and OLED display device |
| CN107424566B (en) * | 2017-09-06 | 2019-12-24 | 深圳市华星光电半导体显示技术有限公司 | OLED pixel driving circuit and OLED display device |
| CN107424567B (en) * | 2017-09-06 | 2019-12-24 | 深圳市华星光电半导体显示技术有限公司 | OLED pixel driving circuit and OLED display device |
| US10223972B1 (en) | 2017-09-06 | 2019-03-05 | Shenzhen China Star Optoelectronics Semiconductor Display Technology Co., Ltd. | OLED pixel driving circuit and OLED display device |
| CN108470546B (en) * | 2018-04-08 | 2020-07-07 | 京东方科技集团股份有限公司 | Current compensation circuit, VR equipment and control method |
| CN109817134B (en) * | 2019-03-19 | 2022-03-18 | 京东方科技集团股份有限公司 | Organic light emitting diode display substrate and driving method thereof |
| CN110910817A (en) * | 2019-11-13 | 2020-03-24 | Tcl华星光电技术有限公司 | Display driving circuit, working method thereof and display panel |
| CN111682058B (en) * | 2020-07-08 | 2022-11-25 | 京东方科技集团股份有限公司 | Display panel and display device |
| CN115083367B (en) * | 2022-07-20 | 2023-06-27 | Tcl华星光电技术有限公司 | Driving voltage compensation device, display terminal and driving voltage compensation method |
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| KR101613737B1 (en) * | 2010-04-09 | 2016-04-19 | 엘지디스플레이 주식회사 | Organic Light Emitting Diode Display And Driving Method Thereof |
| KR101350592B1 (en) * | 2011-12-12 | 2014-01-16 | 엘지디스플레이 주식회사 | Organic light-emitting display device |
| CN102930824B (en) * | 2012-11-13 | 2015-04-15 | 京东方科技集团股份有限公司 | Pixel circuit and driving method and display device |
| CN103117040B (en) * | 2013-01-25 | 2016-03-09 | 北京大学深圳研究生院 | Image element circuit, display device and display drive method |
| CN104637447B (en) * | 2015-02-06 | 2017-06-27 | 京东方科技集团股份有限公司 | Data drive circuit, electric compensation method, array base palte and display device |
| CN105702206B (en) * | 2016-03-04 | 2018-11-30 | 北京大学深圳研究生院 | A kind of offset peripheral system and method, the display system of picture element matrix |
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