CN106157895A - A kind of organic electroluminescence display panel and driving method thereof - Google Patents
A kind of organic electroluminescence display panel and driving method thereof Download PDFInfo
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- CN106157895A CN106157895A CN201610518880.0A CN201610518880A CN106157895A CN 106157895 A CN106157895 A CN 106157895A CN 201610518880 A CN201610518880 A CN 201610518880A CN 106157895 A CN106157895 A CN 106157895A
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- 238000005401 electroluminescence Methods 0.000 title claims abstract description 47
- 238000000034 method Methods 0.000 title claims abstract description 46
- 238000001514 detection method Methods 0.000 claims abstract description 6
- 239000013078 crystal Substances 0.000 claims description 10
- 230000007274 generation of a signal involved in cell-cell signaling Effects 0.000 claims description 9
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- 238000004020 luminiscence type Methods 0.000 claims description 6
- 208000002173 dizziness Diseases 0.000 abstract description 5
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- 235000012364 Peperomia pellucida Nutrition 0.000 description 1
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- 230000032683 aging Effects 0.000 description 1
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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
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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
- 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
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- Physics & Mathematics (AREA)
- Computer Hardware Design (AREA)
- General Physics & Mathematics (AREA)
- Theoretical Computer Science (AREA)
- Electroluminescent Light Sources (AREA)
- Control Of El Displays (AREA)
- Control Of Indicators Other Than Cathode Ray Tubes (AREA)
Abstract
The present invention describes a kind of organic electroluminescence display panel and driving method thereof.Organic electroluminescence display panel includes at least one first circuit and multiple second circuit；A plurality of reference voltage line and a plurality of data lines；Described first circuit includes that signal generating unit, signal input control unit, signal detection unit；Described second circuit includes the first transistor；Described the first transistor is initialized and threshold value detecting by described first circuit by described reference voltage line, and described first circuit carries out valve value compensation by described data wire to described the first transistor.Organic electroluminescence display panel that the present invention provides and driving method thereof can solve the problem that threshold voltage shift cause that display is uneven, solve threshold value detecting during Organic Light Emitting Diode steal the problems such as bright, the present invention provides simultaneously organic electroluminescence display panel and driving method thereof can be used in VR and show, sunset glow can be reduced, improve VR dizziness problem.
Description
Technical field
The present invention relates to display field, particularly relate to a kind of organic electroluminescence display panel and driving method thereof.
Background technology
In recent years, people develop various lightweight and that size is little flat panel display equipment to replace cathode ray tube.This
The example of a little flat panel display equipments includes display panels, plasma display and electroluminescence display panel.Wherein,
Electroluminescence display panel realizes the normal display of display floater by the electroluminescent device in display floater, according to luminescent layer
The difference of material, electroluminescent device is divided into inorganic light-emitting and organic light emission two class, because organic luminescent device has high response
Speed, high-luminous-efficiency, strong brightness and wide viewing angle and by industry be referred to as a new generation Display Technique.
As a kind of current-control type luminescent device, the uniformity of luminance of organic electroluminescence display panel and each luminescence of control
The electric current of unit is closely related.Usually, a corresponding image element circuit of pixel cell, but along with narrow frame shows with high-resolution
The development shown, several pixel cells can also share an image element circuit.But, no matter using which kind of image element circuit above-mentioned to set
Meter, due to technique and the defect such as thin film transistor (TFT) is aging during actual displayed, organic electroluminescence display panel always exists and drives
The problem that dynamic transistor threshold voltage drifts about and causes luminance nonuniformity.At present, solving in threshold voltage shift problem, panel factory
Business generally uses two ways: one is by internal compensation mode, increases compensating unit, in glow phase inside image element circuit
Before first pass through self circuit and carry out threshold value crawl；Two is by external compensation mode, increases compensating unit inside image element circuit,
Before glow phase, first pass through external circuit carry out threshold value crawl.Relative interior compensates, the simple in construction of external compensation and adjustable
Control property is strong, beneficially the high-resolution design of display floater.Therefore, in recent years the mode of external compensation increasingly by panel vendor
Favor.
Figure 1A is a kind of external compensation image element circuit figure that prior art provides.As shown in Figure 1A, image element circuit includes
One transistor T1, transistor seconds T2, third transistor T3, electric capacity Cst and Organic Light Emitting Diode D.Wherein, first crystal
The grid of pipe T1 and the first scan line SCAN1 connect, the first pole by the externally connected circuit of data wire L1 the 011, second pole with
Primary nodal point Q1 connects, the grid of transistor seconds T2 is connected with primary nodal point Q1, the first pole is connected with the first constant pressure source VDD,
Second pole is connected with secondary nodal point Q2, and the grid of third transistor T3 and the second scan line SCAN2 connect, reference is passed through in the first pole
The externally connected circuit of pressure-wire L2 011, the anode of Organic Light Emitting Diode D is connected with secondary nodal point Q2, negative electrode and the second perseverance
Potential source VSS connects.
In figure ia, the first transistor T1～third transistor T3 are all NMOS tube.Figure 1B is external compensation shown in Figure 1A
The driver' s timing figure of circuit realiration valve value compensation.
Specifically, at the first moment t1: provide high level signal to the first scan line SCAN1, the second scan line SCAN2,
Vdata and Vref is provided respectively to data wire L1, reference signal line L2.In the first scan line SCAN1, the second scan line SCAN2
Under high level signal controls, the first transistor T1, third transistor T3 turn on, and Vdata is through data wire L1, the first crystal of conducting
Pipe T1 transmission is transmitted to secondary nodal point Q2 to primary nodal point Q1, Vref through third transistor T3 of reference voltage line L2, conducting.Cause
This, in the t1 moment, the current potential of primary nodal point Q1 is Vdata, the current potential of secondary nodal point Q2 is Vref, and the first electric capacity Cst charging
To the threshold voltage vt h (Vdata-Vref > Vth) of transistor seconds T2 to drive transistor seconds T2.
At the second moment t2, provide high level signal to the first scan line SCAN1, provide low to the second scan line SCAN2
Level signal, provides Vdata and Vref respectively to data wire L1, reference voltage line L2.Now, the first transistor T1 conducting, the
Three transistor T3 cut-offs, Vdata transmits to primary nodal point Q1 through the first transistor T1 of data wire L1, conducting.Due to
Two moment t2 third transistor T3 cut-offs, therefore, Vpre can not be by reference voltage line L2 transmission to secondary nodal point Q2.When t2
Carving, primary nodal point Q1, secondary nodal point Q2 kept the current potential in a upper moment.The purpose being pre-charged reference voltage line L2 exists
In, in order to reduce the impact that subsequent time is worked by the parasitic capacitance on reference voltage line L2.
At the 3rd moment t3, provide high level signal, to data wire to the first scan line SCAN1, the second scan line SCAN2
L1 provides data signal Vdata.Now, the current potential in a upper moment was maintained the most respectively due to primary nodal point Q1, secondary nodal point Q2
Vdata, Vref, and Vdata-Vref > Vth, therefore transistor seconds T2 conducting.Pixel current is through the transistor seconds of conducting
The transmission of T2, third transistor T3 to reference voltage line L2, the voltage of reference voltage line L2 from pre-charge voltage Vpre start according to
Increase in proportion to the pixel current driving transistor seconds T2, until the current potential of secondary nodal point Q2 becomes (Vdata-Vth),
Voltage on reference voltage line L2 reaches saturated.
At the 4th moment t4, provide low level signal to the first scan line SCAN1, the second scan line SCAN2.Now, outward
Saturation voltage Vdata-Vth on reference voltage line L2 is sampled by portion's circuit, and is output as sampled voltage sensing voltage
Vsensing, thus senses the voltage that the pixel current to transistor seconds T2 is directly proportional.Vsensing is utilized to calculate corresponding
The pixel current of the driving transistor seconds T2 of pixel, due between pixel current and the threshold voltage of transistor seconds T2 and pixel
Mobility deviation (respective pixel and the ratio of the mobility of reference pixel) become certain functional relationship, therefore, according to
The calculated pixel current of Vsensing can detect that the mobility between the threshold voltage of transistor seconds T2 and pixel is inclined
Difference, thus obtain the deviant for compensating detected threshold voltage and make for compensating the yield value of mobility deviation
For offset, and in the form of a lookup table this offset is stored in external circuit 011.
To sum up, image element circuit completes the valve value compensation of pixel.When displayed, external circuit is according to each pixel stored
Deviation value and yield value offset data voltage.
But, during the external compensation circuit shown in Figure 1A carries out valve value compensation, in t1, t2 moment due to the second crystalline substance
Body pipe T2 turns on, and can there is Organic Light Emitting Diode D and steal bright problem；Meanwhile, data voltage is write through external compensation secondary
VdataWhen, it is respectively to primary nodal point Q1 and secondary nodal point Q2 write potential, owing to now transistor seconds T2 is because of first
There is current potential and open in node Q1, the signal of telecommunication of the first constant pressure source VDD input transmits to secondary nodal point through transistor seconds T2
Q2, the most at this moment, secondary nodal point Q2 is simultaneously written to electric potential signal and the V of the first constant pressure source VDDref, therefore cannot ensure
The current potential of secondary nodal point 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 electroluminescence display panel, including
At least one first circuit and multiple second circuit；A plurality of reference voltage line and a plurality of data lines；Described first electricity
Road includes that signal generating unit, signal input control unit, signal detection unit；Described second circuit includes the first transistor,
Described the first transistor is initialized and threshold value detecting by described first circuit by described reference voltage line, described first electricity
Road carries out valve value compensation by described data wire to described the first transistor.
On the other hand, the present invention provides a kind of method driving above-mentioned organic electroluminescence display panel, including the first moment,
Two moment, the 3rd moment and the 4th moment, wherein: in described first moment, described signal generating unit is by described reference electricity
Line ball transmission reference voltage signal, initializes the grid of described the first transistor；In described second moment, to described
The threshold value of one transistor is detected and is gathered, and transmits the threshold voltage collected to signal generation unit；Described
In three moment, described signal generating unit passes through data line transfer data signal after overcompensation, enters described the first transistor
Row valve value compensation；In described 4th moment, the conducting luminescence of described organic electroluminescence display panel.
On the other hand, the present invention provides another method driving above-mentioned organic electroluminescence display panel, described driving method
Including first stage and second stage:
In the described first stage, provide high level signal, on described organic electroluminescence display panel to described second voltage source
All pixel cells complete initialize, threshold value detecting with valve value compensation process；
In described second stage, provide low level signal, on described organic electroluminescence display panel to described second voltage source
All pixel cells conducting luminescence.
Compared with prior art, the present invention at least has one of following prominent advantage:
Organic electroluminescence display panel and driving method thereof that the present invention provides can solve the problem that threshold voltage shift causes display
Uneven problem；
The present invention provide organic electroluminescence display panel and driving method can solve the problem that threshold value detecting during organic
Optical diode steals bright problem；
Organic electroluminescence display panel and driving method thereof that the present invention provides can be used in VR and show, can reduce sunset glow,
Improve VR dizziness problem.
Accompanying drawing explanation
Figure 1A is a kind of external compensation image element circuit figure that prior art provides；
Figure 1B is the driver' s timing figure of the valve value compensation of external compensation circuit realiration shown in Figure 1A；
Fig. 2 A is a kind of organic electroluminescence display panel that the present invention provides；
Fig. 2 B be the present invention provide a kind of for driving the circuit embodiments of the work of pixel cell in Fig. 2 A；
Fig. 3 is a kind of to drive the driving method of circuit shown in Fig. 2 B；
Fig. 4 be the present invention provide another for driving the circuit embodiments of the work of pixel cell in Fig. 2 A；
Fig. 5 is the sequential chart for driving circuit as shown in Figure 4；
Fig. 6 is a kind of organic electroluminescence display panel connected mode schematic diagram that the present invention provides；
Fig. 7 is the another kind of organic electroluminescence display panel connected mode schematic diagram that the present invention provides.
Detailed description of the invention
Understandable for enabling the above-mentioned purpose of the present invention, feature and advantage to become apparent from, below in conjunction with accompanying drawing and enforcement
The present invention will be further described for example.
It should be noted that elaborate detail in the following description so that fully understanding the present invention.But this
Bright can be different from alternate manner described here implement with multiple, those skilled in the art can be in the present invention
Similar popularization is done in the case of culvert.Therefore the present invention is not limited by following public detailed description of the invention.
Fig. 2 A is a kind of organic electroluminescence display panel embodiment that the present invention provides.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 wire DL extended along Y-direction, and intersected, by scan line SL and data wire DL, the multiple pixel cells 11 limited,
Wherein X-direction is mutually perpendicular to Y-direction.
Fig. 2 B is for driving the electrical block diagram of each pixel cell 11 work in Fig. 2 A.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
Enter control unit 102 and include that transistor seconds M2, signal detection unit 103 include 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 electric capacity C2 and Organic Light Emitting Diode EL.
Wherein, grid and the first control line CT1 of transistor seconds M2 connects, the first pole connects with signal generating unit 101
Connect, reference voltage line L is passed through in the second polerefIt is connected with first pole of the 4th transistor M4 in second circuit 20；Third transistor M3
Grid and the second control line CT2 connects, the first pole is by reference voltage line LrefWith the 4th transistor M4 in second circuit 20
First pole connects, the second pole is connected with the first input end R of comparator CM；The second input S of comparator CM and the first voltage
Source PVDD connects, outfan T is connected with signal generating unit 101；The grid of the 4th transistor M4 and the first scan line S1 connect,
First pole and reference voltage line LrefConnect, the second pole is connected with primary nodal point N1；The grid of the first transistor M1 and primary nodal point
N1 connects, the first pole is connected with the first voltage source PVDD, the second pole is connected with secondary nodal point N2；The grid of the 5th transistor M5 with
Second scan line S2 connects, the first pole is connected with primary nodal point N1, the second pole is connected with secondary nodal point N2；6th transistor M6's
Grid and three scan line S3 connect, the first pole is connected with primary nodal point N1, the second pole occurs single by data wire DL with signal
Unit 101 connects；The grid of the 7th transistor M7 and the 3rd control line CT3 connect, the first pole is connected with secondary nodal point N2, the second pole
It is connected with the anode of Organic Light Emitting Diode EL；First end of the second electric capacity C2 is connected with primary nodal point N1, the second end and first
Voltage source PVDD connects.
Image element circuit shown in Fig. 2 B can effectively solve the problem that threshold voltage shift causes the problem of display inequality, valve value compensation
During during Organic Light Emitting Diode steals bright problem, valve value compensation in pixel cell node potential cannot accurately write
Problem.
How the image element circuit that further describing the present embodiment below in conjunction with concrete driving method provides realizes above-mentioned technology
Effect.Fig. 3 is that a kind of of the present embodiment offer drives the driving method of circuit shown in Fig. 2 B.It should be noted that the present embodiment
The first transistor M1 to the 6th transistor M6 provided is PMOS, and the most whole circuit is the circuit that pure PMOS is constituted；Certainly,
Whole circuit can also be the circuit that pure NMOS is constituted, then drive the sequential of this pure nmos circuit just with shown in Fig. 3 time
Sequence overturns mutually.In the present embodiment, only by whole circuit be as a example by the circuit that pure PMOS is constituted, in conjunction with the driving side shown in Fig. 3
Method illustrates the work process of circuit.It should be noted that the voltage PVDD that in the present embodiment, the first voltage source provides is constant
High level voltage, second voltage source provide voltage PVEE be constant low level voltage.
Specifically, in the P1 moment, provide the first level signal to the first scan line S1, the first control line CT1, sweep to second
Line S2, three scan line S3, the second control line CT2, the 3rd control line CT3 offer second electrical level signal are provided.Now, sweep first
Retouch under line S1, the first control line CT1 low level signal control, transistor seconds M2, the 4th transistor M4 conducting.Meanwhile, signal
Generating unit 101 transmits reference voltage signal Vref.Therefore, in the P1 moment, the voltage of primary nodal point N1 is Vref, to first crystal
The grid of pipe M1 initializes.Owing to now the 7th transistor M7 ends under the 3rd control line CT3 high level signal controls,
Organic Light Emitting Diode EL cannot be luminous.Therefore, the circuit being used for driving pixel cell to work that the present embodiment provides is to driving
Dynamic transistor (the first transistor M1) will not produce Organic Light Emitting Diode when initializing and steal bright problem.
In the P2 moment, provide the first level signal to the first scan line S1, the second scan line S2, the second control line CT2, to
Three scan line S3, the first control line CT1, the 3rd control line CT3 provide second electrical level signal.Now, the first scan line S1,
Under second scan line S2, the second control line CT2 low level signal control, third transistor M3, the 4th transistor M4, the 5th crystal
Pipe M5 turns on, and the first transistor M1 turns in this moment after the initialization in a moment in process simultaneously.Therefore, the first voltage
The first voltage PVDD that source PVDD produces transmits to primary nodal point N1 through the first transistor M1, the 5th transistor M5 of conducting, leads
The current potential causing primary nodal point N1 constantly raises, as the potential rise up to PVDD-V of primary nodal point N1thTime the first transistor M1 cut-off.
Due to now the 4th transistor M4, the conducting of third transistor M3, therefore, now the current potential of N1 node passes through reference voltage line Lref、
4th transistor M4 of conducting, third transistor M3 transmit the first end R to comparator CM, after comparator CM, by VthValue
It is transferred to signal generation unit 101.Owing to now the 7th transistor M7 cuts under the 3rd control line CT3 high level signal controls
Only, the voltage PVDD that the first voltage source provides cannot be transferred to the anode of Organic Light Emitting Diode EL, Organic Light Emitting Diode EL
Cannot be luminous.Therefore, the circuit being used for driving pixel cell to work that the present embodiment provides is to driving transistor (first crystal
Pipe M1) Organic Light Emitting Diode will not be produced when initializing and steal bright problem.
In order to make it easy to understand, the operation principle of comparator CM is illustrated by the present invention at this.As shown in Figure 2 B, comparator
CM includes the first end R, the second end S and the 3rd end T, and wherein R end is that reverse input end, S end are for input, T are outfan in the same direction.
In the P2 moment, R end connects the voltage PVDD-V of third transistor M3 outputth, S end connect first voltage source PVDD produce first
Voltage PVDD, then outfan T output R end and difference V of S endth, and by VthIt is transferred to signal generation unit 101.
In the P3 moment, provide the first level signal to three scan line S3, to the first scan line S1, the second scan line S2,
First control line CT1, the second control line CT2, the 3rd control line CT3 provide second electrical level signal.Now, at three scan line S3
Under low level signal controls, the 6th transistor M6 conducting.The threshold voltage V that the P2 moment is obtained by signal generation unit 101thCarry out
Calculating processes, by data wire DL output voltage Vdata+VthTo the grid of the first transistor M1 and be saved in the second electric capacity C2,
Complete the valve value compensation to the first transistor M1.
In the P4 moment, provide the first level signal to the 3rd control line CT3, to the first scan line S1, the second scan line S2,
Three scan line S3, the first control line CT1, the second control line CT2 provide second electrical level signal.Now, at the 3rd control line CT3
Low level signal controls lower 7th transistor M7 conducting, simultaneously after the valve value compensation in a upper moment the first transistor M1 at this
Carve conducting.Therefore, the voltage PVDD that P4 moment the first voltage source PVDD produces is by the first transistor M1 of conducting, the 7th crystal
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 is luminous.Glow current I=k (Vdata-PVDD)2, k represents by the mobility driving transistor (the first transistor M1)
The constant determined with parasitic capacitance.
In conjunction with the circuit shown in Fig. 2 B and the driving method shown in Fig. 3, it can be seen that the organic light emission that the present embodiment provides
Display floater can effectively solve the problem that threshold voltage shift causes organic light-emitting diodes during the problem of display inequality, valve value compensation
The problem that node potential during the brightest problem, valve value compensation cannot accurately write stolen by pipe.
Fig. 4 be the present invention provide another for driving the circuit embodiments of each pixel cell in Fig. 2 A.With Fig. 2 B institute
Showing that the difference of circuit is, in circuit shown in Fig. 4, second circuit 20 is not provided with the 7th transistor M7.Fig. 5 is for driving such as Fig. 4
The sequential chart of shown circuit, the difference with driving method shown in Fig. 3 is, the driving method shown in Fig. 5 includes first stage K1
With second stage K2, the voltage PVEE provided at first stage K1 the second voltage source is high level voltage, in second stage K2 the
The voltage PVEE that two voltage sources provide is low level voltage.Wherein, all pixel lists on K1 stage organic electroluminescence display panel
Unit completes initialization, threshold value detecting and valve value compensation process, and all pixel cells on K2 stage organic electroluminescence display panel are sent out
Light.I.e. in the circuit shown in Fig. 4 and Fig. 5, its corresponding sequential is first complete to pixel cells all on organic electroluminescence display panel
Becoming valve value compensation process, the most all pixel cells further play luminescence.So design is advantageous in that, this organic of application
The virtual reality device (Visual Reality, VR) of light display floater can reduce sunset glow, improve VR dizziness problem.
Specifically, the scanning process at any one frame includes first stage K1 and second stage K2.First stage K1 bag
Include 3m moment (k11、k12、k13、k21、k22、k23、…、ki1、ki2、ki3、…、km1、km2、km3), m is organic electroluminescence display panel
The line number of pixel cell.Wherein, at k11、k12、k13Moment is respectively completed the initialization of the first row pixel cell 11, threshold value detecting
With valve value compensation process, at k21、k22、k23Moment is respectively completed the initialization of the second row pixel cell 11, threshold value detecting and threshold value
Compensation process ..., by that analogy, at ki1、ki2、ki3Moment is respectively completed the initialization of the i-th row pixel cell 11, threshold value is detectd
Survey and valve value compensation process.Due to the often initialization of row pixel cell, threshold value detecting identical with valve value compensation process, the most only with
The initialization of the first row pixel cell, threshold value detecting and valve value compensation process example illustrate the specific works of often row pixel cell
Engineering.For convenience of describing, below the first scan line controlling the i-th row pixel cell is 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, will control the first scanning of the 1st row pixel cell
Wire tag is S11, the second scan line S12, three scan line S13, the first control line are CT11, the second control line CT12.
At k11In the moment, provide the first level signal to the first scan line S1, the first control line CT1, to the second scan line S2,
Three scan line S3, the second control line CT2 provide second electrical level signal.Now, at the first scan line S1, the first control line CT1
Under low level signal controls, transistor seconds M2, the 4th transistor M4 conducting.Meanwhile, signal generating unit 101 transmission is with reference to electricity
Pressure signal Vref.Therefore, at k11The voltage of moment primary nodal point N1 is Vref, the grid of the first transistor M1 is initialized.
Due to now second voltage source PVEE provide level be high level, therefore, though first voltage source provide voltage PVDD warp
When the first transistor M1 of conducting is transferred to Organic Light Emitting Diode EL anode, also will not be in the two ends shape of Organic Light Emitting Diode
Become to drive the driving voltage of organic light-emitting diode.I.e. the present embodiment is at the beginning of to driving transistor (the first transistor M1) to carry out
Organic Light Emitting Diode will not be produced during beginningization and steal bright problem.
At k12In the moment, provide the first level signal to the first scan line S1, the second scan line S2, the second control line CT2, to
Three scan line S3, the first control line CT1 provide second electrical level signal.Now, the first scan line S1, the second scan line S2,
Under second control line CT2 low level signal controls, third transistor M3, the 4th transistor M4, the 5th transistor M5 conducting, simultaneously
The first transistor M1 turns in this moment after the initialization in a moment in process.Therefore, the first voltage source PVDD produces
First voltage PVDD transmits to primary nodal point N1 through the first transistor M1, the 5th transistor M5 of conducting, causes primary nodal point N1
Current potential constantly raise, as the potential rise up to PVDD-V of primary nodal point N1thTime the first transistor M1 cut-off.Due to now the 4th
Transistor M4, third transistor M3 turn on, and therefore, now the current potential of N1 node passes through reference voltage line Lref, conducting the 4th brilliant
Body pipe M4, third transistor M3 transmit the first end R to comparator CM, after comparator CM, by VthValue is transferred to signal and produces
Raw unit 101.Because at k12In the moment, the level that the second voltage source PVEE provides remains high level, therefore, and the mistake of threshold acquisition
Even if there being the PVDD voltage transmission anode to Organic Light Emitting Diode EL in journey, the two ends of Organic Light Emitting Diode also will not be formed
Drive the driving voltage of organic light-emitting diode.I.e. the present embodiment is to driving transistor (the first transistor M1) to carry out threshold value
Organic Light Emitting Diode will not be produced during detecting and steal bright problem.
At k13In the moment, provide the first level signal to three scan line S3, 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.Now, control at three scan line S3 low level signal
Under, the 6th transistor M6 conducting.Signal generation unit 101 is to k12The threshold voltage V that moment obtainsthCarry out calculating process, pass through
Data wire DL output voltage Vdata+VthTo the grid of the first transistor M1 and be saved in the second electric capacity C2, complete first brilliant
The valve value compensation of body pipe M1.
As the above analysis, at k11、k12、k13Moment, owing to the voltage PVEE of the second voltage source remains constant height
Level, Organic Light Emitting Diode two ends can not form sufficiently large driving voltage, thus efficiently avoid initialization, threshold value is adopted
During collection, Organic Light Emitting Diode steals bright problem.
K is completed at the first row pixel cell11、k12、k13After process, the second row pixel cell proceeds by k11、k12、k13,
By that analogy, until m row pixel cell completes km1、km2、km3Process, the K1 stage terminates.I.e. on organic electroluminescence display panel
All pixel cells complete valve value compensation.
After the K1 stage terminates, organic electroluminescence 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 in the K2 stage, on display floater
LED lighting.Glow current I=k (Vdata-PVDD)2, k represent by drive transistor (the first transistor M1) mobility and
The constant that parasitic capacitance determines.Simultaneously as the holding effect of the second electric capacity C2, primary nodal point N1 current potential is constant, thus luminous
The glow current in stage can remain unchanged, it is ensured that the uniformity of luminance of glow phase.
As above analyzing, in the circuit shown in Fig. 4 and Fig. 5, its corresponding sequential is first to institute on organic electroluminescence display panel
Having pixel cell to complete valve value compensation process, the most all pixel cells further play luminescence.Organic by containing circuit shown in Fig. 4
When light emitting display panel is in virtual reality device, can reduce when virtual reality device uses and produce sunset glow, improve VR dizzy
The problem such as dizzy.
It should be noted that the organic electroluminescence display panel 1 of present invention offer is correspondingly arranged in each pixel cell 11
One second circuit 20, but will arrange what first circuit 10, the i.e. present invention provided in not limiting each pixel cell 11
The connection of the first circuit and second circuit is not limited to man-to-man connected mode.
Fig. 6 is a kind of organic electroluminescence display panel connected mode schematic diagram that the present invention provides.As shown in Figure 6, it is positioned at together
The second circuit 20 of string is by a reference voltage line LrefIt is connected to first circuit 10, and is positioned at the second of different lines
Circuit is by different reference voltage line LrefIt is connected to the first different circuit 10.I.e. connected mode shown in Fig. 6 is same for being positioned at
The second circuit 20 of string shares first circuit 10.So design is advantageous in that, can freely select some
Pixel cell carries out threshold value detecting and compensation.Therefore in the case of certain region of display floater is carried out valve value compensation, this
The problem that design can be avoided compensating the pixel cell that need not threshold value detecting and valve value compensation and be greatly increased energy consumption.
Fig. 7 is the another kind of organic electroluminescence display panel connected mode schematic diagram that the present invention provides.As it is shown in fig. 7, be positioned at
A reference voltage line L is passed through with the second circuit 20 of stringrefIt is connected to first circuit 10, and is positioned at the of different lines
Two circuit are by different reference voltage line LrefIt is connected to same first circuit 10.So design is advantageous in that, Ke Yijie
Save technique dough-making powder board space, it is simple to the realization that narrow frame and high-resolution show.
It should be noted that the first circuit is positioned at non-display area in the organic electroluminescence display panel of present invention offer.
It should be noted that the signal generation unit of the first circuit is collection in the organic electroluminescence display panel of present invention offer
Become IC circuit.
Above content is to combine concrete preferred implementation further description made for the present invention, it is impossible to assert
Being embodied as of the present invention is confined to these explanations.For general technical staff of the technical field of the invention,
On the premise of present inventive concept, it is also possible to make some simple deduction or replace, all should be considered as belonging to the present invention's
Protection domain.
Claims (9)
1. an organic electroluminescence display panel, including:
At least one first circuit and multiple second circuit；
A plurality of reference voltage line and a plurality of data lines；
Described first circuit includes that signal generating unit, signal input control unit, signal detection unit；
Described second circuit includes the first transistor；
Described the first transistor is initialized by described first circuit by described reference voltage line and threshold value is detected, and described the
One circuit carries out valve value compensation by described data wire to described the first transistor.
2. organic electroluminescence display panel as claimed in claim 1, it is characterised in that be positioned at the plurality of second electricity of same string
Road is electrically connected by a described reference voltage line and a described second circuit.
3. organic electroluminescence display panel as claimed in claim 1, it is characterised in that described signal input control unit includes the
Two-transistor, the grid of described transistor seconds and the first control line connect, the first pole is connected with described signal generating unit, the
Two poles are connected with described reference voltage line；Described signal detection unit includes third transistor, comparator, the first electric capacity, wherein,
The grid of described third transistor and the second control line connect, the first pole is connected with described reference voltage line, the second pole is with described
First end of comparator connects, and the first end of described first electric capacity is connected with the first pole of described third transistor, the second termination
One constant potential, the second end of described comparator and the first voltage source connect, the 3rd end is connected with described signal generating unit.
4. organic electroluminescence display panel as claimed in claim 3, it is characterised in that described second circuit also includes the 4th crystal
Pipe, the 5th transistor, the 6th transistor, the 7th transistor, the second electric capacity and Organic Light Emitting Diode；Wherein, the described 4th
The grid of transistor and the first scan line connect, the first pole is connected with described reference voltage line, the second pole is connected with primary nodal point；
The grid of described the first transistor is connected with described primary nodal point, the first pole is connected with described first voltage source, the second pole and the
Two nodes connect；The grid of described 5th transistor and the second scan line connect, the first pole is connected with described primary nodal point, second
Pole is connected with described secondary nodal point, and the grid of described 6th transistor and three scan line connect, the first pole is connected with data wire,
And it being connected to described signal generating unit by data wire, the second pole is connected with described primary nodal point, described 7th transistor
Grid and the 3rd control line connect, the first pole is connected with described secondary nodal point, the second pole and the sun of described Organic Light Emitting Diode
Pole connects, and the first end of described second electric capacity is connected with described primary nodal point, the second end is connected with described first voltage source, described
The negative electrode of Organic Light Emitting Diode and the second voltage source connect.
5. organic electroluminescence display panel as claimed in claim 3, it is characterised in that described second circuit also includes the 4th crystal
Pipe, the 5th transistor, the 6th transistor, the second electric capacity and Organic Light Emitting Diode；Wherein, the grid of described 4th transistor
Be connected with the first scan line, the first pole is connected with described reference voltage line, the second pole is connected with primary nodal point；Described first crystal
The grid of pipe is connected with described primary nodal point, the first pole is connected with described first voltage source, the second pole is connected with secondary nodal point；Institute
State the grid of the 5th transistor and the second scan line connects, the first pole is connected with described primary nodal point, the second pole and described second
Node connects, and the grid of described 6th transistor and three scan line connect, the first pole is connected with data wire, and passes through data wire
Being connected to described signal generating unit, the second pole is connected with described primary nodal point, the first end of described second electric capacity and described the
One node connects, the second end is connected with described first voltage source, and the negative electrode of described Organic Light Emitting Diode and the second voltage source are even
Connect.
6. organic electroluminescence display panel as claimed in claim 1, described signal generation unit is IC.
7. the driving method for organic electroluminescence display panel as claimed in claim 4, it is characterised in that each pixel list
The work process of unit includes the first moment, the second moment, the 3rd moment and the 4th moment, wherein:
In described first moment, provide the first level signal to described first scan line, the first control line, to described second scanning
Line, three scan line, the second control line, the 3rd control line provide second electrical level signal, and described signal generating unit is by described
Reference voltage line transmission reference voltage signal, initializes the grid of described the first transistor；
In described second moment, provide described first level letter to described first scan line, the second scan line, the second control line
Number, provide described second electrical level signal, to described first crystal to described three scan line, the first control line, the 3rd control line
The threshold value of pipe is detected and is gathered, and transmits the threshold voltage collected to signal generation unit；
In described 3rd moment, to described three scan line provide described first level signal, to described first scan line, second
Scan line, the first control line, the second control line, the 3rd control line provide described second electrical level signal, described signal generating unit
By data line transfer data signal after overcompensation, described the first transistor is carried out valve value compensation；
In described 4th moment, to described 3rd control line provide described first level signal, to described first scan line, second
Scan line, three scan line, the first control line, the second control line provide described second electrical level signal, and described pixel cell turns on
Luminous.
8. the driving method for organic electroluminescence display panel as claimed in claim 5, it is characterised in that described driving side
Method includes first stage and second stage:
In the described first stage, described second voltage source provides high level signal, owning on described organic electroluminescence display panel
Pixel cell completes initialization, threshold value detecting and valve value compensation process；
In described second stage, described second voltage source provides low level signal, owning on described organic electroluminescence display panel
Pixel cell conducting luminescence.
9. the driving method of organic electroluminescence display panel as claimed in claim 8, it is characterised in that in the described first stage, often
The work process of individual pixel cell includes the first moment, the second moment and the 3rd moment:
In described first moment, provide the first level signal to described first scan line, the first control line, to described second scanning
Line, three scan line, the second control line provide second electrical level signal, and described signal generating unit is passed by described reference voltage line
Defeated reference voltage signal, initializes the grid of described the first transistor；
In described second moment, provide described first level letter to described first scan line, the second scan line, the second control line
Number, provide described second electrical level signal to described three scan line, the first control line, the threshold value of described the first transistor is carried out
Detecting and collection, and the threshold voltage collected is transmitted to signal generation unit；
In described 3rd moment, to described three scan line provide described first level signal, to described first scan line, second
Scan line, the first control line, the second control line provide described second electrical level signal, and described signal generating unit is passed by data wire
Defeated data signal after overcompensation, carries out valve value compensation to described the first transistor.
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Effective date of registration: 20211029 Address after: No.8, liufangyuan Henglu, Donghu New Technology Development Zone, Wuhan City, Hubei Province Patentee after: WUHAN TIANMA MICROELECTRONICS Co.,Ltd. Patentee after: Wuhan Tianma Microelectronics Co.,Ltd. Shanghai Branch Patentee after: Tianma Micro-Electronics Co.,Ltd. Address before: Room 509, building 1, No. 6111, Longdong Avenue, Pudong New Area, Shanghai, 200120 Patentee before: SHANGHAI TIANMA AM-OLED Co.,Ltd. Patentee before: Tianma Micro-Electronics Co.,Ltd. |