CN105913802B - A kind of organic electroluminescent LED display panel and its driving method - Google Patents
A kind of organic electroluminescent LED display panel and its driving method Download PDFInfo
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- CN105913802B CN105913802B CN201610506193.7A CN201610506193A CN105913802B CN 105913802 B CN105913802 B CN 105913802B CN 201610506193 A CN201610506193 A CN 201610506193A CN 105913802 B CN105913802 B CN 105913802B
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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]
Abstract
The present invention describes a kind of organic electroluminescent LED display panel, including：The data line that the grid line and n items that m items extend along a first direction extend along second direction；At least one compensating unit and multiple pixel circuit units, pixel circuit unit include the first transistor and light-emitting component, and compensating unit is for being acquired and compensating to the threshold voltage of the first transistor；One compensating unit is connected at least one pixel circuit unit by data line, and a grid line is connect at least one pixel circuit unit；The working stage of organic electroluminescent LED display panel includes data write phase and glow phase；In data write phase, the light-emitting component for the pixel circuit unit being connect with m grid line ends, and in glow phase, light-emitting component simultaneously turns on.Display panel provided by the invention can meet requirement of the VR display devices for display pattern, promote sensory experience.
Description
Technical field
The present invention relates to display technology fields, more particularly to a kind of organic electroluminescent LED display panel and its drive
Dynamic method.
Background technology
Organic Light Emitting Diode (Organic Light-Emitting Diode, OLED) display because have it is frivolous,
The characteristics such as power saving are applied more and more widely in various display equipment.In OLED display, organic light emission is normally comprised
Diode array (i.e. pel array), and each Organic Light Emitting Diode into array provide the pixel electricity of driving current
Road.
As shown in Figure 1, the schematic diagram of the pixel circuit for existing OLED display.Pixel circuit includes first
Transistor T1, second transistor T2, second transistor T3, storage capacitance Cst and Organic Light Emitting Diode D.Wherein first crystal
The grid of pipe T1 and the first scan line S1 connections, the first pole receive data voltage signal VDATA, and the second pole and first node Q1 connect
It connects；The grid of second transistor T2 is connected with first node Q1, and the first pole receives the first constant voltage signal PVDD, the second pole and second
Node Q2 connections；The grid of second transistor T3 and the second scan line S2 connections, the first pole receive the second constant voltage signal PVEE, the
Two poles are connected with second node Q2；The first pole plate of storage capacitance Cst is connected with first node Q1, the second pole plate and second node
Q2 connections；The anode of Organic Light Emitting Diode D is connected with second node Q2, cathode and the second constant voltage signal PVEE connections.Fig. 1
In, the first transistor T1, second transistor T2, second transistor T3 are NMOS transistor, and second transistor T2 is that driving is brilliant
Body pipe, for driving Organic Light Emitting Diode D to shine.
Fig. 2 is the driver' s timing figure of the pixel circuit for the OLED display that Fig. 1 is provided.In the first moment P1, to first
Scan line S1 provides low level, provides high level, the first transistor T1 cut-offs to the second scan line S2, third transistor T3 is led
Logical, the second constant voltage signal PVEE is transmitted to second node Q2, is resetted to the anode of Organic Light Emitting Diode D；At second
P2 is carved, high level is provided to the first scan line S1, low level, the first transistor T1 conductings, data are provided to the second scan line S2
Voltage signal VDATA is transmitted to first node Q1, second transistor T2 conductings, and the first constant voltage signal PVDD is transmitted to second node
Q2, the first constant voltage signal PVDD are higher than the second constant voltage signal PVEE, and Organic Light Emitting Diode D conductings shine.It is known, You Jifa
The gate source voltage of the driving current of optical diode D and its driving transistor T2 and threshold voltage difference it is square proportional.
In the pixel circuit that Fig. 1 is provided, the electric current of the driving current Iel of Organic Light Emitting Diode D and the grid source electricity of second transistor T2
Pressure Vgs and threshold voltage vt h relationship be：Iel ∝ (Vgs-Vth)2.Due to Vgs=Vg-Vs=VDATA-PVDD, so
Iel ∝ (Vgs-Vth)2=(VDATA-PVDD-Vth)2, therefore Organic Light Emitting Diode D driving currents and driving transistor
The threshold voltage vt h of T2 is related.
The OLED display that the prior art provides is during actual displayed due to technique and thin film transistor (TFT) aging etc.
There is drive transistor threshold voltage drift and lead to luminance nonuniformity in defect.
Also, with the fast development of VR (Virtual Reality) display technology, there are larger need currently on the market
It asks.Traditional OLED display is within the time of a frame, and pixel circuit is after completing the work such as data write-in, in pixel circuit
Organic Light Emitting Diode can be connected at once it is luminous, from the first row pixel circuit of grid line scanning direction to last column pixel electricity
The fluorescent lifetime on road, Organic Light Emitting Diode successively decreases line by line, this is known as full sunset glow.Full sunset glow can cause spinning sensation, very big shadow
Ring sensory experience.In VR display devices, within the time of a frame, pixel is needed to shine in the time of about percentage 20, remaining
Time in be in dark-state, and all pixels in entire panel synchronize and are in luminance or dark-state, and utilization is existing
The pixel circuit and driving method that technology provides are difficult to realize such display pattern.
Invention content
In view of this, a kind of organic electroluminescent LED display panel of present invention offer and its driving method.
The present invention provides a kind of organic electroluminescent LED display panels, including：
The data line that the grid line and n items that m items extend along a first direction extend along second direction；
At least one compensating unit and multiple pixel circuit units, the pixel circuit unit include the first transistor and hair
Optical element, the compensating unit is for being acquired and compensating to the threshold voltage of the first transistor；
One compensating unit is connected at least one pixel circuit unit by the data line, described in one
Grid line is connect at least one pixel circuit unit；
The working stage of the organic electroluminescent LED display panel includes data write phase and glow phase；
In the data write phase, the described of the pixel circuit unit 20 being connect with grid line described in m items shines
Element ends；
In the glow phase, the light-emitting component for the pixel circuit unit 20 being connect with grid line described in m items
It simultaneously turns on；Wherein, m, n are positive integer, and m ＞ 1, n ＞ 1.
The present invention also provides a kind of driving methods of driving organic electroluminescent LED display panel, for driving this
The organic electroluminescent LED display panel provided is provided, including：In the organic electroluminescent LED display panel work
Make in the N frames of process, in any frame, the compensating unit 10 is to the first transistor M1 described in multiple pixel circuit units 20
Threshold voltage be acquired；
The data write phase includes threshold acquisition stage, valve value compensation stage and dark-state stage, when with described in xth item
When the pixel circuit unit 20 and the compensating unit 10 of grid line connection are operated in the dark-state stage, with (x+1)th item
The pixel circuit unit 20 and the compensating unit 10 of grid line connection are operated in threshold acquisition stage, described
Valve value compensation stage and the dark-state stage；Wherein, N, x are positive integer, and 1≤x≤m-1.
The present invention also provides a kind of driving methods of driving organic electroluminescent LED display panel, for driving this
The organic electroluminescent LED display panel provided is provided, including：
The organic electroluminescent LED display panel further includes memory；
Before the N frames of the organic electroluminescent LED display panel course of work, the compensating unit 10 is to more
The threshold voltage of the first transistor M1 described in a pixel circuit unit 20 is acquired, and collected threshold voltage is protected
There are in the memory, the threshold voltage in arbitrary i-th frame calls the memory, N is positive integer, 1≤i≤N；
The data write phase includes threshold acquisition stage, valve value compensation stage and dark-state stage, any in N frames
Frame, when the working stage of the pixel circuit unit 20 and the compensating unit 10 that are connect with grid line described in xth item is in institute
When stating the dark-state stage, the work of the pixel circuit unit 20 and the compensating unit 10 that are connect with -1 grid line of xth
Make the stage in the valve value compensation stage and the dark-state stage.
Compared with prior art, the present invention at least has the advantages that one of prominent as follows：
A kind of organic electroluminescent LED display panel and its driving method provided by the invention can solve threshold value electricity
The problem that pressure drift causes display uneven；And may be implemented all pixels in entire panel synchronize in luminance or
Person's dark-state can be effectively improved full sunset glow problem, meet requirement of the VR display devices for display pattern, promote sensory experience.
Description of the drawings
Fig. 1 is a kind of schematic diagram of the pixel circuit of OLED display in the prior art；
Fig. 2 is the driver' s timing figure of pixel circuit shown in Fig. 1；
Fig. 3 is a kind of schematic diagram of organic electroluminescent LED display panel provided in an embodiment of the present invention；
Fig. 4 is the schematic diagram of compensating unit 10 and pixel circuit unit 20 provided in an embodiment of the present invention；
Fig. 5 is the schematic structure of compensating unit 10 and pixel circuit unit 20 that further embodiment of the present invention provides
Figure；
Fig. 6 is the driving method schematic diagram for the organic electroluminescent LED display panel that Fig. 3 embodiments provide；
Fig. 7 is the work schedule schematic diagram of compensating unit and pixel circuit unit in the driving method that Fig. 6 embodiments provide；
Fig. 8 is another the driving method schematic diagram for the organic electroluminescent LED display panel that Fig. 3 embodiments provide；
Fig. 9 is the work schedule schematic diagram of compensating unit and pixel circuit unit in the driving method that Fig. 8 embodiments provide.
Specific implementation mode
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 in order to fully understand the present invention.But this hair
Bright to be implemented different from other manner described here with a variety of, those skilled in the art can be without prejudice in the present invention
Similar popularization is done in the case of culvert.Therefore the present invention is not limited by following public specific implementation mode.
Referring to FIG. 3, Fig. 3 is a kind of signal of organic electroluminescent LED display panel provided in an embodiment of the present invention
Property structure chart.As shown in figure 3, a kind of organic electroluminescent LED display panel 100, including：M items extend along a first direction
Grid line SL, including data line DL that SL1, SL2 extend to SLm and n items along second direction, including DL1, DL2, DL3
To DLn；At least one compensating unit 10 and multiple pixel circuit units 20, wherein pixel circuit unit includes the first transistor
M1 and light-emitting element E L, compensating unit 10 is for being acquired and compensating to the threshold voltage of the first transistor M1, wherein first
Transistor M1 is driving transistor, for driving light-emitting element E L to shine；One compensating unit 10 and at least one pixel circuit
Unit 20 is connected by data line DL, and data line DL is used to be 20 transmission data signal of pixel circuit unit；One grid line SL
Connect at least one pixel circuit unit 20, grid line SL be used for control data-signal writing pixel circuit unit 20 when
Between.The working stage of organic electroluminescent LED display panel 100 includes data write phase and glow phase；It is write in data
Enter the stage, organic electroluminescent LED display panel 100 completes threshold voltage is acquired and compensates, data-signal is written etc.
Work, the light-emitting element E L cut-offs for the pixel circuit unit 20 being connect with m grid line SL, entire organic electroluminescent LED
Display panel 100 is maintained at the non-luminous state of dark-state；In glow phase, the pixel circuit unit being connect with m grid line SL
20 light-emitting element E L is simultaneously turned on, and organic electroluminescent LED display panel 100 shines, shows image；Wherein, m, n are equal
For positive integer, and m ＞ 1, n ＞ 1.In the present embodiment, first direction and second direction are vertical, in the other embodiment of the present invention
In, angle between first direction and second direction can be in the range of more than 0 ° and less than 90 °.
In the present embodiment, a data line DL connections are located at the pixel unit 20 of same row, a data line DL connections one
A compensating unit 10, thus a compensating unit 10 and positioned at same row multiple pixel units 20 pass through a data line DL connect
It connects, a realization of compensating unit 10 is acquired the threshold voltage of multiple the first transistor M1 of the pixel unit 20 of same row
And compensation.In other embodiments of the invention, a data line DL connections are located at the pixel unit 20 of same row, n datas
Line DL one compensating unit 10 of connection, therefore a compensating unit 10 is connected with n row pixel unit 20 by n data lines DL；
Or a compensating unit 10 and a pixel unit 20 connect one to one, other such as such connection types differ herein
One repeats.
Organic electroluminescent LED display panel 100 provided in this embodiment, using compensating unit 10 to pixel unit
The threshold voltage of the first transistor M1 in 20 is acquired and compensates, and can solve threshold voltage shift and cause display unevenness
Problem；And the light-emitting element E L that all pixel circuit units 20 in entire display panel may be implemented is synchronized in luminous
State or dark-state can be effectively improved full sunset glow problem, meet requirement of the VR display devices for display pattern, promote sense organ
Experience.
Referring to FIG. 4, Fig. 4 is compensating unit 10 provided in an embodiment of the present invention and the schematic knot of pixel circuit unit 20
Composition.As shown in figure 4, pixel circuit unit 20 includes the first transistor M1, second transistor M2, third transistor M3, the 4th
Transistor M4, the first capacitance C1 and light-emitting element E L.Wherein, the grid of the first transistor M1 is connected to first node N1,
One pole is connected to the first pole of third transistor M3, the second pole is connected to second node N2；The grid of second transistor M2 connects
To the first control terminal SCAN to receive first control signal, the first pole reception reference voltage signal Vref, the second pole and first segment
Point N1 connections；The grid of third transistor M3 is connected to the second control terminal EMIT to receive second control signal, the connection of the second pole
To first voltage source VDD；The grid of 4th transistor M4 be connected to the first control terminal SCAN with receive first control signal scan,
First pole is connected to data line DL, the second pole is connected to second node N2；The first pole plate of first capacitance C1 is connected to first segment
Point N1, the second pole plate are connected to second node N2；The first pole of light-emitting element E L is connected to second node N2, the second pole is connected to
The second voltage source VEE.By change the second voltage source VEE electric signal, can control light-emitting element E L when be connected it is luminous.
In some optional realization methods, with continued reference to FIG. 4, compensating unit 10 includes threshold voltage collecting unit
101, data-signal control unit 102 and signal processing unit 103.Wherein, threshold voltage collecting unit 101 includes the 5th crystal
The grid of pipe M5, the second capacitance C2 and comparator CM, the 5th transistor M5 are connected to third control terminal CLK to receive third control
Signal, the first pole are connected to data line DL, the second pole is connected to the first end R of comparator CM；The first pole plate of second capacitance C2
Be connected to the first pole of the 5th transistor M5, the second pole plate receives constant voltage signal, in the present embodiment, constant voltage signal is
Ground signalling, because without additional electric signal is arranged；The second end S of comparator CM receives reference voltage signal Vref, third
End T is connected to signal processing unit 103.Threshold voltage collecting unit 101 provided in this embodiment includes comparator CM, to first
The threshold voltage of transistor M1 is acquired, and is transmitted to signal processing unit 103.Data-signal control unit 102 includes the
The grid of six transistor M6, the 6th transistor M6 is connected to the 4th control terminal CK to receive the 4th control signal, the connection of the first pole
It is connected to data line DL to signal processing unit 103, the second pole.Data-signal control unit 102 can control at signal
When the data-signal of reason unit 103 is transmitted to pixel circuit unit 20.In compensating unit 10 provided in an embodiment of the present invention, letter
Number processing unit 103 has the function of reading, processing, operation, transmission telecommunications number etc., such as integrated circuit (Integrated
Circuit) chip；It should be noted that the function of signal processing unit 103 is 101 sum number of processing threshold voltage collecting unit
According to the electric signal of signaling control unit 102, therefore threshold voltage collecting unit 101 and data-signal control unit 102 can be straight
Signal processing unit 103 is connect or is indirectly connected to, between threshold voltage collecting unit 101 and signal processing unit 103,
May include other structures unit between data-signal control unit 102 and signal processing unit 103, in embodiment illustrated in fig. 4
A kind of connection relation is only schematically provided, but does not constitute and limits.
The compensating unit 10 and pixel circuit unit 20 that Fig. 4 embodiments provide, using threshold voltage collecting unit 101 to the
The threshold voltage of one transistor M1 is acquired, and is transmitted to signal processing unit 103, signal processing unit 103 through operation at
Data-signal of the output after overcompensation after reason can solve the first transistor M1 threshold voltage shifts and cause display is uneven to ask
Topic；It is luminous by the way that when the electric signal control light-emitting element E L of the second voltage source VEE is connected, to realize the institute in entire panel
The light-emitting element E L of some pixel circuit units 20, which is synchronized, is in luminance or dark-state, can be effectively improved full sunset glow and ask
Topic meets requirement of the VR display devices for display pattern, promotes sensory experience.
In some optional realization methods, referring to FIG. 5, Fig. 5 continues to use the reference numeral of Fig. 4, something in common is no longer superfluous
It states, difference place is, compensating unit 10 further includes memory 104, the first end of memory 104 and the third end of comparator CM
T connections, second end and signal processing unit 103 connect.Memory 104 is collected for storing threshold voltage collecting unit 101
The first transistor M1 threshold voltage and storage, signal processing unit 103 need use when can call the threshold value
Voltage.
The compensating unit 10 and pixel circuit unit 20 that Fig. 5 embodiments provide store the first transistor using memory 104
The threshold voltage of M1, it is possible to reduce it is aobvious to improve organic electroluminescent LED for the frequency of the work of threshold voltage collecting unit 101
Show the working efficiency of panel 100.
Organic electroluminescent LED display panel provided by the invention is further described below in conjunction with specific driving method
In compensating unit and pixel circuit unit how to realize above-mentioned technique effect.
Fig. 6 is the driving method schematic diagram for the organic electroluminescent LED display panel that Fig. 3 embodiments provide.Incorporated by reference to
With reference to figure 3 and Fig. 6, the organic electroluminescent LED display panel 100 that Fig. 3 embodiments provide in the N frames of the course of work,
Any frame, compensating unit 10 are acquired the threshold voltage of the first transistor M1 of multiple pixel circuit units 20, as,
Each frame, compensating unit 10 are required for the threshold voltage of acquisition the first transistor M1 and compensate.
Include data write phase Tdata in the working stage of any frame, organic electroluminescent LED display panel 100
With glow phase T4.Data write phase Tdata includes threshold acquisition stage T1, valve value compensation stage T2 and dark-state stage T3；
When the pixel circuit unit 20 and compensating unit 10 that are connect with the 1st article of grid line SL1 are operated in the dark-state stage, with the 2nd article of grid
The pixel circuit unit 20 and compensating unit 10 of polar curve SL2 connections be operated in the threshold acquisition stage, the valve value compensation stage and
The dark-state stage；When the pixel circuit unit 20 and compensating unit 10 that are connect with xth grid line SLx are operated in the dark-state stage,
With the (x+1)th grid line SLx+1 pixel circuit units 20 connecting and compensating unit 10 be operated in threshold acquisition stage T1,
Valve value compensation stage T2 and dark-state stage T3；Wherein, N, x are positive integer, and 1≤x≤m-1.Driving provided in this embodiment
In the driving method of organic electroluminescent LED display panel 100, connect with the 1st article of grid line SL1 to the m articles grid line SLm
The duration of the dark-state stage T3 of the pixel circuit unit 20 and compensating unit 10 that connect gradually successively decreases；With each grid line SL
The pixel circuit unit 20 of connection and compensating unit 10 after the work for completing threshold acquisition stage T1 and valve value compensation stage T2,
Dark-state stage T3 is stayed in, waits for and completes threshold with the subsequent grid line SL pixel circuit units 20 connecting and compensating unit 10
It is worth the work of acquisition phase T1 and valve value compensation stage T2, when the pixel circuit unit 20 being connect with the last item grid line SLm
After the work for completing threshold acquisition stage T1, valve value compensation stage T2 and dark-state stage T3 with compensating unit 10, display panel 100
The work for carrying out glow phase T4, with the light-emitting element E L of first article to the m articles grid line SL pixel circuit units 20 connecting
It simultaneously turns on luminous.The driving method of driving organic electroluminescent LED display panel provided in this embodiment both may be implemented
The external compensation of threshold voltage, and the light-emitting element E L of all pixel circuit units 20 in entire display panel may be implemented
It is synchronous to be in luminance or dark-state, it can be effectively improved full sunset glow problem, meet VR display devices for display pattern
It is required that promoting sensory experience.
Fig. 7 is that compensating unit 10 and the work schedule of pixel circuit unit 20 show in the driving method that Fig. 6 embodiments provide
It is intended to.It should be noted that the first transistor M1 to the 6th transistor M6 is NMOS tube in the embodiment of the present invention, below in relation to
The first level that Fig. 7 is described is high level, and second electrical level is low level.But the present invention does not limit this, when the first crystalline substance
It is low level below in relation to the first level that Fig. 7 is described when body pipe M1 to the 6th transistor M6 is PMOS tube, second
Level is high level.
Referring to FIG. 7, in organic electroluminescent LED display panel provided in an embodiment of the present invention, compensating unit 10 is also
Including third control terminal CLK, the 4th control terminal CK, pixel circuit unit 20 further includes the first control terminal SCAN, the second control terminal
EMIT and the second voltage source VEE；Wherein, third control terminal CLK is used for transmission third control signal clk, the 4th control terminal CK use
It is used for transmission first control signal scan, the second control terminal EMIT use in transmission the 4th control signal ck, the first control terminal SCAN
In transmission second control signal emit, the second voltage source VEE for providing second voltage signal vee.More specifically, incorporated by reference to ginseng
Fig. 4 is examined, in threshold acquisition stage T1, to the first control terminal SCAN, the second control terminal EMIT, third control terminal CLK, second voltage
Source VEE provides the first level, and second electrical level is provided to the 4th control terminal CK.At this point, in the 4th low level controls of control terminal CK
Under, the 6th transistor M6 cut-offs；Under the control of the first control terminal SCAN high level, second transistor M2 conductings, reference voltage
Signal Vref is transmitted to first node N1；Under the control of the second control terminal EMIT high level, third transistor M3 conductings, first
The electric signal transmission of voltage source VDD is to second node N2, and the electric signal of first voltage source VDD is high level, therefore second node
The current potential of N2 increases, and since the condition of the first transistor M1 conductings is Vgs-Vth ＞ 0, Vth is the threshold value of the first transistor M1
Voltage, Vgs=Vg-Vs, Vg=Vref, Vs are the current potential of second node N2, therefore when the current potential of second node N2 is increased to
When Vref-Vth, the first transistor M1 cut-offs, the first transistor M1 is driving transistor；In the first control terminal SCAN, third control
Under the control of CLK high level in end processed, the 4th transistor M4, the 5th transistor M5 conductings, the electric signal transmission of first voltage source VDD
It is transmitted to threshold voltage collecting unit 101 to second node N2 and by the 4th transistor M4, when the potential rise of second node N2
When up to Vref-Vth the first transistors M1 ends, the current potential Vref-Vth of second node N2 passes through the 5th transistor M5 transmission
To the first end of the comparator CM in threshold voltage collecting unit 101, comparator CM is after relatively by the first transistor M1's
Threshold voltage vt h is transmitted to signal processing unit 103.
In order to make it easy to understand, the present invention illustrates the operation principle of comparator CM at this.As shown in figure 4, comparator
CM includes the ends R, the ends S and the ends T, and wherein the ends R are reverse input end, the ends S are noninverting input, T is output end.At the T1 moment, the ends R
The ends voltage Vref-Vth, S connection reference voltage signal Vref of the 5th transistor M5 outputs is connected, then output end T exports the ends R
With the difference Vth at the ends S, and threshold voltage vt h is transferred to signal processing unit 103.
In valve value compensation stage T2, first is provided to the first control terminal SCAN, the 4th control terminal CK, the second voltage source VEE
Level provides second electrical level to the second control terminal EMIT, third control terminal CLK, data-signal is provided to the data line.This
When, under the second control terminal EMIT, the low level controls of third control terminal CLK, third transistor M3, the 5th transistor M5 are cut
Only, third transistor M3 cut-offs can prevent the electric signal transmission of first voltage source VDD to second node N2, make light-emitting element E L
Conducting shines；Under the control of the first control terminal SCAN high level, second transistor M2 conductings, reference voltage signal Vref transmission
To first node N1；Under the control of the 4th control terminal CK high level, the 6th transistor M6 conductings, signal processing unit 103 will
The threshold voltage vt h that the T1 moment obtains carries out calculation processing and output voltage Vdata-Vth to data line DL, second node N2
Voltage be Vdata-Vth.
In dark-state stage T3, the first level is provided to the second voltage source VEE, to the first control terminal SCAN, the second control terminal
EMIT, third control terminal CLK, the 4th control terminal CK provide second electrical level.At this point, in the first control terminal SCAN, the second control terminal
Under EMIT, third control terminal CLK, the 4th low level controls of control terminal CK, second transistor M2, third transistor M3, the 4th
Transistor M4, the 5th transistor M5, the 6th transistor M6 are turned off；Under the control of the second voltage source VEE high level, shine member
Part EL keeps cut-off state.
In glow phase T4, the first level is provided to the second control terminal EMIT, to the first control terminal SCAN, third control terminal
CLK, the 4th control terminal CK, the second voltage source VEE provide second electrical level.At this point, in the first low level controls of control terminal SCAN
Under, second transistor M2, the 4th transistor M4 cut-offs；The electric signal of the second voltage source VEE is low level, in the second control terminal
Under the control of EMIT high level, third transistor M3 conducting, the electric signal of first voltage source VDD passes through third transistor M3, the
Light-emitting element E L conductings are driven to shine after one transistor M1.
It is known, the driving current of light-emitting element E L and its driving transistor in organic electroluminescent LED display panel
Gate source voltage and threshold voltage difference it is square proportional.In the present embodiment, the driving current Iel of light-emitting element E L
The relationship of electric current and the gate source voltage Vgs and threshold voltage vt h of the first transistor M1 be：Iel ∝ (Vgs-Vth)2。
In glow phase T4, because the coupling of the first capacitance C1, the current potential of first node N1 are maintained at valve value compensation
The current potential of Vref when stage T2, second node N2 are maintained at Vdata-Vth when valve value compensation stage T2, therefore first segment
Point N1, second node N2 potential difference N1-N2 be maintained at Vref-Vdata+Vth.Known, Vgs=Vg-Vs, Vg are
The current potential Vref, Vs of first node N1 are the current potential Vdata-Vth of second node N2, therefore Vgs-Vth=Vref-
Vdata+Vth-Vth=Vref-Vdata, as：Iel ∝ (Vref-Vdata)2.It can be seen that in the utility model
In embodiment, flow through the first transistor M1 for drive the driving current Iel of light-emitting element E L only with reference voltage signal Vref
It is related with data-signal Vdata, it is unrelated with the gate source voltage Vgs of the first transistor M1 itself and threshold voltage vt h.
In the prior art, due to manufacturing process and device aging etc., existing for the threshold voltage vt h of driving transistor
Non-uniform phenomenon causes display picture uneven to influence so as to cause for driving the electric current of light-emitting component that deviation occurs
Display effect.In embodiment provided by the invention, harmful effect in the prior art can be eliminated.
It should be noted that assuming that scan frequency is N (i.e. scanning N frame in 1s), then each phase stands shown in Fig. 7 exist
The course of work of each compensating unit 10 and pixel circuit unit 20 in arbitrary i-th frame, including T1 moment, T2 moment, T3 moment
With the T4 moment, wherein 1≤i≤N.
The driving method of driving organic electroluminescent LED display panel provided in this embodiment can be with compensation pixel electricity
The threshold voltage vt h of the driving transistor M1 of road unit 20；And realize all pixel circuit lists in entire display panel
The light-emitting element E L of member 20, which is synchronized, is in luminance or dark-state, can be effectively improved full sunset glow problem, meets VR display dresses
The requirement for display pattern is set, sensory experience is promoted.
Fig. 8 is another the driving method schematic diagram for the organic electroluminescent LED display panel that Fig. 3 embodiments provide.
Incorporated by reference to reference to figure 3 and Fig. 8, the organic electroluminescent LED display panel 100 that Fig. 3 embodiments provide further includes memory
(Fig. 3 is not marked) is threshold acquisition stage T1 before the N frames of 100 course of work of organic electroluminescent LED display panel,
Compensating unit 10 is acquired the threshold voltage of the first transistor M1 of multiple pixel circuit units 20, and by collected threshold
Threshold voltage preserves in memory, and the threshold voltage in arbitrary i-th frame calls memory, N is positive integer, 1≤i≤N.I.e.
For m grid line SL is scanned the work for completing threshold acquisition stage t1 successively, in the threshold acquisition rank of every grid line SL
Section t1, the first transistor of the compensating unit 10 being connect with every grid line SL to multiple pixel circuit units 20 being correspondingly connected with
The threshold voltage of M1 is acquired.In threshold acquisition stage T1, complete to the more of organic electroluminescent LED display panel 100
The threshold voltage collecting work of the first transistor M1 of a pixel circuit unit 20, and collected threshold voltage is stored in
In reservoir.The working stage of arbitrary i-th frame in N frames, organic electroluminescent LED display panel 100 includes data write-in
Stage Tdata and glow phase T4.Data write phase Tdata includes valve value compensation stage T2 and dark-state stage T3, when with xth
The pixel circuit unit 20 of grid line SLx connections and the working stage of compensating unit 10 are in dark-state stage T3, with (x+1)th item
The pixel circuit unit 20 of grid line SLx+1 connections and the working stage of compensating unit 10 are in valve value compensation stage T2 and dark-state rank
Section T3.Wherein, N, x are positive integer, and 1≤x≤m-1.
In the driving method of driving organic electroluminescent LED display panel 100 provided in this embodiment, with the 1st article of grid
The duration of the pixel circuit unit 20 of polar curve SL1 to the m articles grid line SLm connection and the dark-state stage T3 of compensating unit 10
Gradually successively decrease；With each grid line SL pixel circuit units 20 connecting and compensating unit 10 valve value compensation stage T2 work
After work, dark-state stage T3 is stayed in, is waited for and the subsequent grid line SL pixel circuit units 20 connecting and compensating unit 10
The work for completing valve value compensation stage T2, when the pixel circuit unit 20 and compensating unit being connect with the last item grid line SLm
After 10 complete the work of valve value compensation stage T2 and dark-state stage T3, the pixel being connect with first article to the m articles grid line SL is electric
The light-emitting element E L of road unit 20 simultaneously turns on luminous, the work of the progress glow phase of display panel 100 T4.The present embodiment provides
The driving method of driving organic electroluminescent LED display panel can complete threshold acquisition before the N frames of the course of work
The work in stage, and any frame during the work time calls collected threshold value, is transferred without all carrying out threshold value in each frame,
Save the power consumption of display panel；And realize the light-emitting element E L of all pixel circuit units 20 in entire display panel
It is synchronous to be in luminance or dark-state, it can be effectively improved full sunset glow problem, meet VR display devices for display pattern
It is required that promoting sensory experience.
Fig. 9 is that compensating unit 10 and the work schedule of pixel circuit unit 20 show in the driving method that Fig. 8 embodiments provide
It is intended to.It should be noted that the first transistor M1 to the 6th transistor M6 is NMOS tube in the embodiment of the present invention, below in relation to
The first level that Fig. 9 is described is high level, and second electrical level is low level.But the present invention does not limit this, when the first crystalline substance
It is low level below in relation to the first level that Fig. 9 is described when body pipe M1 to the 6th transistor M6 is PMOS tube, second
Level is high level.
Referring to FIG. 9, in organic electroluminescent LED display panel provided in an embodiment of the present invention, compensating unit 10 is also
Including third control terminal CLK, the 4th control terminal CK, pixel circuit unit 20 further includes the first control terminal SCAN, the second control terminal
EMIT and the second voltage source VEE；Wherein, third control terminal CLK is used for transmission third control signal clk, the 4th control terminal CK use
It is used for transmission first control signal scan, the second control terminal EMIT use in transmission the 4th control signal ck, the first control terminal SCAN
In transmission second control signal emit, the second voltage source VEE for providing second voltage signal vee.More specifically, incorporated by reference to ginseng
Examine Fig. 5.It is in place of the difference for the driving method that the driving method that Fig. 9 embodiments provide is provided with Fig. 7 embodiments, in Organic Electricity
Before the N frames of 100 course of work of photoluminescence diode display panel, m grid line SL is scanned completes threshold acquisition successively
The work of stage t1, in the threshold acquisition stage t1 of every grid line SL, the compensating unit 10 being connect with every grid line SL is right
The threshold voltage of the first transistor M1 of multiple pixel circuit units 20 being correspondingly connected with is acquired and is stored in memory 104
In.Any frame in N frames, the compensating unit 10 and pixel circuit unit 20 being connect with every grid line SL are sequentially completed threshold value
The work of compensated stage T2, dark-state stage T3 and glow phase T4, and deposited in valve value compensation stage T2 calls memory 104
The threshold voltage of the first transistor M1 of storage.It should be noted that in the threshold acquisition stage t1 of every grid line SL, compensation is single
The threshold value that the threshold acquisition course of work of member 10 and pixel circuit unit 20 please refers in the driving method of Fig. 7 embodiments offer is adopted
In collection stage T1, valve value compensation stage T2 provided in this embodiment, dark-state stage T3 and glow phase T4, compensating unit 10 and picture
The course of work of plain circuit unit 20 please refer to Fig. 7 embodiments offer driving method in valve value compensation stage T2, dark-state rank
Section T3 and glow phase T4, this embodiment is not repeated.
The driving method of driving organic electroluminescent LED display panel provided in this embodiment can be with compensation pixel electricity
The threshold voltage vt h of the driving transistor M1 of road unit 20, and the threshold voltage vt h of driving transistor M1 is stored in storage
In device, threshold voltage vt h is called in the subsequent course of work；And realize all pixel electricity in entire display panel
The light-emitting element E L of road unit 20, which is synchronized, is in luminance or dark-state, can be effectively improved full sunset glow problem, it is aobvious to meet VR
Requirement of the showing device for display pattern promotes sensory experience.
The above content is a further detailed description of the present invention in conjunction with specific preferred embodiments, and it cannot be said that
The specific implementation of the present invention is confined to these explanations.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 the present invention's
Protection domain.
Claims (12)
1. a kind of organic electroluminescent LED display panel, which is characterized in that including：
The data line that the grid line and n items that m items extend along a first direction extend along second direction；
At least one compensating unit and multiple pixel circuit units, the pixel circuit unit include the first transistor and the member that shines
Part, the compensating unit is for being acquired and compensating to the threshold voltage of the first transistor；The of the light-emitting component
Two poles are connected to the second voltage source, and the electric signal by changing the second voltage source controls the conducting of light-emitting component；
One compensating unit is connected at least one pixel circuit unit by the data line, a grid
Line is connect at least one pixel circuit unit；
The compensating unit includes threshold voltage collecting unit, data-signal control unit and signal processing unit；The threshold value
Voltage acquisition unit is acquired the threshold voltage of the first transistor, and is transmitted to signal processing unit；The signal processing
Unit exports the data-signal after overcompensation after calculation process；The data-signal control unit comes from signal for controlling
When the data-signal of processing unit is transmitted to pixel circuit unit；
The working stage of the organic electroluminescent LED display panel includes data write phase and glow phase；
In the data write phase, the light-emitting component for the pixel circuit unit being connect with grid line described in m items is cut
Only；
In the glow phase, the light-emitting component for the pixel circuit unit being connect with grid line described in m items is led simultaneously
It is logical；Wherein, m, n are positive integer, and m ＞ 1, n ＞ 1.
2. organic electroluminescent LED display panel as described in claim 1, which is characterized in that the pixel circuit unit
Further include second transistor, third transistor, the 4th transistor, the first capacitance and light-emitting component；
The grid of the first transistor is connected to first node, the first pole is connected to the first pole of the third transistor,
Two poles are connected to second node；
The grid of the second transistor is connected to the first control terminal to receive first control signal, the first pole reception reference voltage
Signal, the second pole are connected to the first node；
The grid of the third transistor is connected to the second control terminal to receive second control signal, the second pole is connected to the first electricity
Potential source；
The grid of 4th transistor is connected to first control terminal to receive the first control signal, the connection of the first pole
It is connected to the second node to the data line, the second pole；
First pole plate of first capacitance is connected to the first node, the second pole plate is connected to the second node；
First pole of the light-emitting component is connected to the second node, the second pole is connected to the second voltage source.
3. organic electroluminescent LED display panel as claimed in claim 2, which is characterized in that
The threshold voltage collecting unit includes the 5th transistor, the second capacitance and comparator；
The grid of 5th transistor is connected to third control terminal, and to receive, third controls signal, the first pole is connected to the number
The first end of the comparator is connected to according to line, the second pole；First pole plate of second capacitance is connected to the 5th crystal
First pole of pipe, the second pole plate receive constant voltage signal；The second end of the comparator receives reference voltage signal, third end
It is connected to the signal processing unit；
The data-signal control unit includes the 6th transistor, the grid of the 6th transistor be connected to the 4th control terminal with
Receive the 4th control signal, the first pole is connected to the signal processing unit, the second pole is connected to the data line.
4. organic electroluminescent LED display panel as claimed in claim 3, which is characterized in that the compensating unit also wraps
Include memory, the first end of the memory connect with the third end of the comparator, second end and the signal processing unit
Connection.
5. organic electroluminescent LED display panel as described in claim 1, which is characterized in that be located at the described of same row
Multiple pixel circuit units are electrically connected by a data line with a compensating unit.
6. organic electroluminescent LED display panel as described in claim 1, which is characterized in that the first direction and institute
It is vertical to state second direction.
7. a kind of driving method of driving organic electroluminescent LED display panel described in claim 1, which is characterized in that
In the N frames of the organic electroluminescent LED display panel course of work, in any frame, the compensating unit is to multiple institutes
The threshold voltage for stating the first transistor of pixel circuit unit is acquired；
In any frame, the data write phase includes threshold acquisition stage, valve value compensation stage and dark-state stage, when with xth
When the pixel circuit unit and the compensating unit that grid line described in item connects are operated in the dark-state stage, with (x+1)th
The pixel circuit unit and the compensating unit that grid line described in item connects are operated in the threshold acquisition stage, the threshold
It is worth compensated stage and the dark-state stage；Wherein, N, x are positive integer, and 1≤x≤m-1.
8. the driving method of organic electroluminescent LED display panel as claimed in claim 7, which is characterized in that
The compensating unit further includes third control terminal, the 4th control terminal, the pixel circuit unit further include the first control terminal,
Second control terminal and the second voltage source；
In the threshold acquisition stage, to first control terminal, second control terminal, the third control terminal, described
Two voltage sources provide the first level, and second electrical level is provided to the 4th control terminal；
In the valve value compensation stage, described in first control terminal, the 4th control terminal, the second voltage source offer
First level provides the second electrical level to second control terminal, the third control terminal, data is provided to the data line
Signal；
In the dark-state stage, first level is provided to the second voltage source, to first control terminal, described second
Control terminal, the third control terminal, the 4th control terminal provide the second electrical level；
In the glow phase, first level is provided to second control terminal, to first control terminal, the third
Control terminal, the 4th control terminal, the second voltage source provide the second electrical level.
9. the driving method of organic electroluminescent LED display panel as claimed in claim 8, which is characterized in that
The organic electroluminescent LED display panel further includes threshold voltage collecting unit, data-signal control unit and letter
Number processing unit；
In the threshold acquisition stage, the threshold voltage collecting unit is detected and is adopted to the threshold value of the first transistor
Collection, and collected threshold voltage is transmitted to the signal processing unit；
In the valve value compensation stage, under the control of the data-signal control unit, the signal processing unit passes through institute
Data-signal of the data line transfer after overcompensation is stated, valve value compensation is carried out to the first transistor；
In the dark-state stage, the light-emitting component cut-off；
In the glow phase, the light-emitting component conducting shines.
10. a kind of driving method of driving organic electroluminescent LED display panel as described in claim 1, feature exist
In the organic electroluminescent LED display panel further includes memory；
It is threshold acquisition stage, the compensation before the N frames of the organic electroluminescent LED display panel course of work
Unit is acquired the threshold voltage of the first transistor of multiple pixel circuit units, and by collected threshold value
Voltage is stored in the memory, the threshold voltage in arbitrary i-th frame calls the memory, and N is positive integer, and 1≤i
≤N；
The data write phase includes valve value compensation stage and dark-state stage, any frame in N frames, when with described in xth item
The pixel circuit unit of grid line connection and the working stage of the compensating unit are at the dark-state stage, with (x+1)th
The working stage of the pixel circuit unit and the compensating unit that grid line described in item connects is in the valve value compensation stage
With the dark-state stage.
11. a kind of driving method of driving organic electroluminescent LED display panel as claimed in claim 10, feature
It is,
The compensating unit further includes third control terminal, the 4th control terminal, the pixel circuit unit further include the first control terminal,
Second control terminal and the second voltage source；
In the threshold acquisition stage, to first control terminal, second control terminal, the third control terminal, described
Two voltage sources provide the first level, and second electrical level is provided to the 4th control terminal；
In the valve value compensation stage, described in first control terminal, the 4th control terminal, the second voltage source offer
First level, the second electrical level is provided to the second control terminal, the third control terminal, and data letter is provided to the data line
Number；
In the dark-state stage, first level is provided to the second voltage source, to first control terminal, described second
Control terminal, the third control terminal, the 4th control terminal provide the second electrical level；
In the glow phase, first level is provided to second control terminal, to first control terminal, the third
Control terminal, the 4th control terminal, the second voltage source provide the second electrical level.
12. the driving method of organic electroluminescent LED display panel as claimed in claim 11, which is characterized in that described
Organic electroluminescent LED display panel further includes threshold voltage collecting unit, data-signal control unit and signal processing list
Member；
In the threshold acquisition stage, the threshold voltage collecting unit is detected and is adopted to the threshold value of the first transistor
Collection, and collected threshold voltage is transmitted to the signal processing unit；
In the valve value compensation stage, under the control of the data-signal control unit, the signal processing unit passes through institute
Data-signal of the data line transfer after overcompensation is stated, valve value compensation is carried out to the first transistor；
In the dark-state stage, the light-emitting component cut-off；
In the glow phase, the light-emitting component conducting shines.
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| CN106409225B (en) * | 2016-12-09 | 2019-03-01 | 上海天马有机发光显示技术有限公司 | Organic light emissive pixels compensation circuit, organic light emitting display panel and driving method |
| KR102241717B1 (en) * | 2016-12-27 | 2021-04-16 | 선전 로욜 테크놀로지스 컴퍼니 리미티드 | Pixel circuit driving method, pixel circuit group, and organic light emitting display device |
| US10535305B2 (en) | 2017-08-02 | 2020-01-14 | Shenzhen China Star Optoelectronics Semiconductor Display Technology Co., Ltd. | AMOLED display panel with function of temperature compensation and display device thereof |
| CN107274836B (en) * | 2017-08-02 | 2020-03-17 | 深圳市华星光电半导体显示技术有限公司 | AMOLED display panel with temperature compensation function and display device |
| CN109147647B (en) * | 2018-09-29 | 2021-07-30 | 上海天马有机发光显示技术有限公司 | Control method of pixel circuit and display device |
| TWI706395B (en) * | 2019-01-25 | 2020-10-01 | 友達光電股份有限公司 | Pixel circuit and detection method thereof |
| CN112102771B (en) * | 2019-06-17 | 2022-02-25 | 京东方科技集团股份有限公司 | Pixel circuit, driving method and display device |
| CN110689837B (en) * | 2019-10-29 | 2023-11-28 | 深圳市华星光电半导体显示技术有限公司 | Pixel driving circuit and display panel |
| KR102648002B1 (en) * | 2020-11-13 | 2024-03-15 | 엘지디스플레이 주식회사 | Display device and method for driving it |
| CN112382236A (en) * | 2020-12-03 | 2021-02-19 | 深圳市华星光电半导体显示技术有限公司 | Pixel circuit and driving method thereof |
| CN113362763B (en) | 2021-06-01 | 2023-07-28 | 京东方科技集团股份有限公司 | Display panel, display device and current detection method of pixel driving circuit of display device |
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| KR101350592B1 (en) * | 2011-12-12 | 2014-01-16 | 엘지디스플레이 주식회사 | Organic light-emitting display device |
| CN103325335B (en) * | 2012-03-21 | 2015-09-09 | 群康科技(深圳)有限公司 | Display and driving method thereof |
| CN103886826B (en) * | 2012-12-21 | 2018-08-07 | 上海天马微电子有限公司 | A kind of organic light-emitting diode display array |
| CN103927990B (en) * | 2014-04-23 | 2016-09-14 | 上海天马有机发光显示技术有限公司 | The image element circuit of OLED and driving method, OLED |
| CN105096817B (en) * | 2014-05-27 | 2017-07-28 | 北京大学深圳研究生院 | Image element circuit and its driving method and a kind of display device |
| CN104252844B (en) * | 2014-09-23 | 2017-04-05 | 京东方科技集团股份有限公司 | Image element circuit and its driving method, organic electroluminescence display panel and display device |
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Effective date of registration: 20211027 Address after: No.8, liufangyuan Henglu, Donghu New Technology Development Zone, Wuhan City, Hubei Province Patentee after: WUHAN TIANMA MICRO-ELECTRONICS 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. |