CN107863067A - Display device, image element circuit and its compensation method and compensation device - Google Patents
Display device, image element circuit and its compensation method and compensation device Download PDFInfo
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- CN107863067A CN107863067A CN201711271030.6A CN201711271030A CN107863067A CN 107863067 A CN107863067 A CN 107863067A CN 201711271030 A CN201711271030 A CN 201711271030A CN 107863067 A CN107863067 A CN 107863067A
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- driving transistor
- compensation
- image element
- element circuit
- threshold voltage
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- G—PHYSICS
- G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
- G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
- G09G3/00—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes
- G09G3/20—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters
- G09G3/22—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources
- G09G3/30—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources using electroluminescent panels
- G09G3/32—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources using electroluminescent panels semiconductive, e.g. using light-emitting diodes [LED]
- G09G3/3208—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources using electroluminescent panels semiconductive, e.g. using light-emitting diodes [LED] organic, e.g. using organic light-emitting diodes [OLED]
- G09G3/3225—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources using electroluminescent panels semiconductive, e.g. using light-emitting diodes [LED] organic, e.g. using organic light-emitting diodes [OLED] using an active matrix
Abstract
The invention discloses a kind of display device, image element circuit and its compensation method and compensation device, the image element circuit includes driving transistor, data wire and detection signal line, the described method comprises the following steps：External compensation is carried out to image element circuit to obtain the threshold voltage of driving transistor；Internal compensation is carried out to image element circuit according to the threshold voltage of driving transistor, thus the threshold voltage compensation to driving transistor can not only be realized, and the larger characteristic variations of driving transistor can be covered, real-Time Compensation is carried out to the characteristic variations of driving transistor, effectively avoid compensating magnetic hysteresis, and vestige caused by external compensation etc. can be eliminated so that display effect reaches more preferable.
Description
Technical field
The present invention relates to display technology field, the more particularly to a kind of compensation method of image element circuit, a kind of image element circuit
Compensation device, a kind of image element circuit and a kind of display device.
Background technology
Propulsion over time, and AMOLED (Active Matrix Organic Light Emitting Diode, it is active
Matrix/organic light emitting diode (AMOLED)) product application it is more and more extensive, with its high-contrast, high colour gamut, frivolous and can make soft
The advantages that property screen, increasingly approved by people.
With widely using for AMOLED products, some existing problems also have increasing need for obtaining during its display
Properly settle.For example, due to technique, material and design etc., cause the threshold of driving transistor in AMOLED products
Threshold voltage drifts about, and in turn results in product and shows uneven, display effect is poor.
The content of the invention
It is contemplated that at least solves one of technical problem in correlation technique to a certain extent.Therefore, the present invention
First purpose is to propose a kind of compensation method of image element circuit, can not only realize and the threshold voltage of driving transistor is mended
Repay, and the larger characteristic variations of driving transistor can be covered, real-Time Compensation is carried out to the characteristic variations of driving transistor, had
Effect avoids compensating magnetic hysteresis, and can eliminate vestige caused by external compensation etc. so that display effect reaches more preferable.
Second object of the present invention is to propose a kind of compensation device of image element circuit.
Third object of the present invention is to propose a kind of image element circuit.
Fourth object of the present invention is to propose a kind of display device.
To achieve the above object, first aspect present invention embodiment proposes a kind of compensation method of image element circuit, described
Image element circuit includes driving transistor, data wire and detection signal line, the described method comprises the following steps：To the image element circuit
External compensation is carried out to obtain the threshold voltage of the driving transistor；According to the threshold voltage of the driving transistor to described
Image element circuit carries out internal compensation.
The compensation method of image element circuit according to embodiments of the present invention, external compensation first is carried out to image element circuit and driven with obtaining
The threshold voltage of dynamic transistor, internal compensation is then carried out to image element circuit according to the threshold voltage of driving transistor, so as to not
The threshold voltage compensation to driving transistor can be only realized, and the larger characteristic variations of driving transistor can be covered, it is right
The characteristic variations of driving transistor carry out real-Time Compensation, effectively avoid compensating magnetic hysteresis, and can eliminate caused by external compensation
Vestige etc. so that display effect reaches more preferable.
In addition, the compensation method of image element circuit according to the above embodiment of the present invention can also have technology additional as follows
Feature：
According to one embodiment of present invention, to the picture within the black plug time that picture is shown or when being shown without picture
Plain circuit carries out external compensation.
According to one embodiment of present invention, it is described that external compensation is carried out to the image element circuit to obtain the driving crystalline substance
The threshold voltage of body pipe, including：By grid from the data wire to the driving transistor write-in detection data voltage so that
The driving transistor conducting, to be charged by the source electrode power supply of the driving transistor to the detection signal line；It is logical
Cross and obtain the charging voltage on the detection signal line to obtain the threshold voltage of the driving transistor.
According to one embodiment of present invention, the threshold voltage according to the driving transistor is to the image element circuit
Internal compensation is carried out, including：The fluorescent lifetime that picture is shown divides multiple stages, wherein, the multiple stage includes inside
Compensated stage and data write phase；In the internal compensation stage, the grid by the data wire to the driving transistor
Pole writes the threshold voltage of predetermined reference voltage and the driving transistor so that the driving transistor turns on, with to the drive
The source electrode power supply of dynamic transistor is charged；In the data write phase, by the data wire to the driving transistor
Grid write-in display data voltage and the driving transistor threshold voltage so that the driving transistor turn on, to pass through
The driving transistor driving luminescent device lights.
To achieve the above object, second aspect of the present invention embodiment proposes a kind of compensation device of image element circuit, described
Image element circuit includes driving transistor, data wire and detection signal line, and the compensation device includes：External compensation unit, is used for
External compensation is carried out to the image element circuit to obtain the threshold voltage of the driving transistor；Internal compensation unit, for root
Internal compensation is carried out to the image element circuit according to the threshold voltage of the driving transistor.
The compensation device of image element circuit according to embodiments of the present invention, image element circuit is carried out by external compensation unit outer
Portion is compensated to obtain the threshold voltage of driving transistor, and the threshold voltage pair by internal compensation unit according to driving transistor
Image element circuit carries out internal compensation, so as to can not only realize the threshold voltage compensation to driving transistor, and can cover
The larger characteristic variations of driving transistor, real-Time Compensation is carried out to the characteristic variations of driving transistor, effectively avoids compensating magnetic hysteresis,
And vestige caused by external compensation etc. can be eliminated so that display effect reaches more preferable.
In addition, the compensation device of image element circuit according to the above embodiment of the present invention can also have technology additional as follows
Feature：
According to one embodiment of present invention, the external compensation unit be used within the black plug time that picture is shown or
External compensation is carried out to the image element circuit when being shown without picture.
According to one embodiment of present invention, the external compensation unit carries out external compensation to obtain to the image element circuit
When taking the threshold voltage of the driving transistor, wherein, the external compensation unit is brilliant to the driving by the data wire
The grid write-in detection data voltage of body pipe is so that the driving transistor turns on, to pass through the source electrode of driving transistor electricity
Source is charged to the detection signal line, and by obtaining the charging voltage on the detection signal line to obtain the driving
The threshold voltage of transistor.
According to one embodiment of present invention, the internal compensation unit is according to the threshold voltage pair of the driving transistor
When the image element circuit carries out internal compensation, wherein, the fluorescent lifetime division that the internal compensation unit shows picture is multiple
Stage, wherein, the multiple stage includes internal compensation stage and data write phase；It is described in the internal compensation stage
Internal compensation unit writes predetermined reference voltage to the grid of the driving transistor by the data wire and the driving is brilliant
The threshold voltage of body pipe is so that driving transistor conducting, is charged with the source electrode power supply to the driving transistor；
The data write phase, the internal compensation unit write display by the data wire to the grid of the driving transistor
Data voltage and the threshold voltage of the driving transistor are so that the driving transistor turns on, to pass through the driving transistor
Driving luminescent device lights.
To achieve the above object, third aspect present invention embodiment proposes a kind of image element circuit, and it includes above-mentioned benefit
Repay device.
Image element circuit according to embodiments of the present invention, by above-mentioned compensation device, it can not only realize to image element circuit
The threshold voltage compensation of middle driving transistor, and the larger characteristic variations of driving transistor can be covered, to driving transistor
Characteristic variations carry out real-Time Compensation, effectively avoid compensating magnetic hysteresis, and vestige caused by external compensation etc. can be eliminated so that
Display effect reaches more preferable.
To achieve the above object, fourth aspect present invention embodiment proposes a kind of display device, and it includes above-mentioned picture
Plain circuit.
Display device according to embodiments of the present invention, by above-mentioned image element circuit, can effectively it eliminate because of external compensation
Caused vestige etc. so that display effect reaches more preferable.
Brief description of the drawings
Fig. 1 is the flow chart of the compensation method of image element circuit according to embodiments of the present invention；
Fig. 2 is the structural representation of image element circuit according to an embodiment of the invention；
Fig. 3 is the working timing figure of the image element circuit shown in Fig. 2；
Fig. 4 is the block diagram of the compensation device of image element circuit according to embodiments of the present invention；
Fig. 5 is the block diagram of image element circuit according to embodiments of the present invention；
Fig. 6 is the block diagram of display device according to embodiments of the present invention.
Embodiment
Embodiments of the invention are described below in detail, the example of the embodiment is shown in the drawings, wherein from beginning to end
Same or similar label represents same or similar element or the element with same or like function.Below with reference to attached
The embodiment of figure description is exemplary, it is intended to for explaining the present invention, and is not considered as limiting the invention.
With reference to the accompanying drawings come the compensation method of the image element circuit that describes to propose according to embodiments of the present invention, image element circuit
Compensation device, image element circuit and display device.
Generally when making display product (such as AMOLED products), due to technique, material and design etc., lead
Cause to show the threshold voltage shift of driving transistor in product, in turn result in product show it is uneven, the problem of display effect difference.
In view of the above-mentioned problems, be generally by compensating the threshold voltage of driving transistor to solve, and
Compensation for threshold voltage, mainly include two major classes, respectively internal compensation and external compensation.But current internal compensation
Compensation ability is limited, it is impossible to the characteristic variations of driving transistor are completely covered, and external compensation is easy to produce compensation vestige
Mura is compensated, is exactly after external compensation is carried out, shows that the brightness of product has inhomogeneities, cause various vestiges, cause
Final display effect is poor, and the real-Time Compensation of external compensation is limited in one's ability.Therefore, either internal compensation or outside is mended
Repay and all will be unable to meet many requirements.Therefore, the present invention proposes a kind of compensation method of image element circuit, disclosure satisfy that more
Aspect requirement so that the display effect of final products reaches fine.
Fig. 1 is the flow chart of the compensation method of image element circuit according to embodiments of the present invention.
In an embodiment of the present invention, image element circuit includes driving transistor, data wire and detection signal line.
As shown in figure 1, the compensation method of the image element circuit of the embodiment of the present invention comprises the following steps：
S1, external compensation is carried out to image element circuit to obtain the threshold voltage of driving transistor.
S2, internal compensation is carried out to image element circuit according to the threshold voltage of driving transistor.
Specifically, by above analyzing, either internal compensation or external compensation all lack there will be certain
Fall into, by carefully analyzing and studying discovery to internal compensation and external compensation, although internal compensation has compensation ability
The defects of characteristic variations limited, that driving transistor can not be completely covered, but internal compensation will not produce compensation vestige, simultaneously
There is the ability of real-Time Compensation for the characteristic variations of driving transistor, and for external compensation, although easily producing compensation trace
Mark and compensation is ageing poor, but the compensation range of external compensation is wide, and the characteristic variations of its driving transistor covered are big.
Therefore, the present invention makes full use of the advantages of internal compensation and external compensation to compensate image element circuit, i.e. first
External compensation is carried out to image element circuit to obtain the threshold voltage of driving transistor, then according to the threshold of the driving transistor of acquisition
Threshold voltage carries out internal compensation to image element circuit, so can not only realize the threshold voltage compensation to driving transistor, solves
The problem of display that threshold voltage shift is brought is uneven, and the larger characteristic variations of driving transistor can be covered, to driving
The characteristic variations of dynamic transistor carry out real-Time Compensation, effectively avoid compensating magnetic hysteresis, and can eliminate trace caused by external compensation
Mark etc. so that display effect reaches more preferable.
To enable those skilled in the art to be better understood upon the present invention, enter with reference to the specific example of the present invention
Row describes in detail.
According to one embodiment of present invention, external compensation is carried out to image element circuit to obtain the threshold value of driving transistor electricity
Pressure, including：Data voltage is detected so that driving transistor turns on, to pass through by grid write-in of the data wire to driving transistor
The source electrode power supply of driving transistor charges to detection signal line；By obtaining the charging voltage on detection signal line to obtain
The threshold voltage of driving transistor.
In an embodiment of the present invention, can be within the black plug time that picture is shown or when being shown without picture to pixel electricity
Road carries out external compensation.For example, as shown in figure 3,1 frame time that can show picture is divided into two parts, a part is
The time is shown, another part is the black plug time (can also claim blank areas), wherein the display time is used to control luminescent device to be sent out
Light, black plug time are used to carry out external compensation to image element circuit to obtain the threshold voltage of driving transistor.
Specifically, by taking the image element circuit shown in Fig. 2 as an example.As shown in Fig. 2 the image element circuit include driving transistor DT,
The first transistor T1, second transistor T2, storage capacitance C1, luminescent device OLED, data wire DATA, detection signal line Sense
Line, the first control line G1 and the second control line G2.Wherein, driving transistor DT drain electrode is connected with the first power vd D；First
Transistor T1 control pole is connected with the first control line G1, and the first transistor T1 the first pole is connected with data wire DATA, and first
Transistor T1 the second pole and one end of driving transistor DT grid and storage capacitance C1 are respectively connected with；Second transistor T2's
Control pole is connected with the second control line G2, and second transistor T2 the first pole is connected with detection signal line Sense Line, and second
Transistor T2 the second pole and one end point of driving transistor DT source electrode, the storage capacitance C1 other end and luminescent device OLED
Xiang Lian not；The luminescent device OLED other end is connected with second source VSS.
As shown in Figures 2 and 3, within the black plug time that picture is shown, external control unit outside (e.g., GOA areas can be first passed through
IC chip) high level signal is exported respectively to the first control line G1 and the second control line G2, now the first transistor T1 and second
Transistor T2 is both turned on, while external control unit outside output detection data voltage V1 (such as 3V) to data wire DATA, drives crystal
Pipe DT is turned on, and the detection data voltage V1 on data wire DATA passes through the first transistor T1, driving transistor DT grid source electrode, the
Two-transistor T2 is charged to detection signal line Sense Line.Charge after a period of time, external control unit outside obtains detecting
Charging voltage on signal wire Sense Line, driving transistor DT threshold voltage is then obtained according to the charging voltage.By
This, can obtain the threshold voltage of driving transistor, then according to the threshold voltage pair by carrying out external compensation to image element circuit
Image element circuit carries out internal compensation.
It should be noted that in an embodiment of the present invention, image element circuit can also be carried out using other manner outer
Portion's compensation is to obtain the threshold voltage of driving transistor, but aforesaid way is by a relatively simple, it is easy to accomplish, it is advantageous to adopt
The threshold voltage of driving transistor is obtained with above-mentioned external compensation mode.
According to one embodiment of present invention, internal benefit is carried out to image element circuit according to the threshold voltage of driving transistor
Repay, including：The fluorescent lifetime that picture is shown divides multiple stages, wherein, multiple stages include internal compensation stage and data
Write phase；Compensated stage internally, predetermined reference voltage is write to the grid of driving transistor by data wire and driving is brilliant
The threshold voltage of body pipe is so that driving transistor conducting, is charged with the source electrode power supply to driving transistor；Write in data
In the stage, the threshold voltage of display data voltage and driving transistor is write so as to drive to the grid of driving transistor by data wire
Dynamic transistor turns, to drive luminescent device to light by driving transistor.
Specifically, still by taking the image element circuit shown in Fig. 2 as an example.As shown in Figures 2 and 3, control is luminous within the display time
Device, which light, may include multiple stages, respectively reseting stage, internal compensation stage, data write phase and display rank
Section.
Wherein, in reseting stage, external control unit outside exports high level signal to the controls of the first control line G1 and second respectively
Line G2 processed, now the first transistor T1 and second transistor T2 are both turned on, while external control unit outside output predetermined reference voltage
Vref and the threshold voltage vt h of the driving transistor obtained input resetting voltage (such as 0V) to detecting and believed to data wire DATA
Number line Sense Line, are resetted with the both end voltage to storage capacitor C1, while driving transistor DT is turned on.
Compensated stage internally, external control unit outside export low level signal to the controls of the first control line G1 and second respectively
Line G2, now the first transistor T1 and second transistor T2 disconnect, in the presence of storage capacitor C1, driving transistor DT after
It is continuous to maintain conducting state, to be charged by driving transistor DT to driving transistor DT source electrode power supply (i.e. S points), to enter
Row threshold voltage compensation.
In data write phase, external control unit outside exports high level signal to the first control line G1, and continues to output low
Level signal turns on to the second control line G2, now the first transistor T1, and second transistor T2 disconnects, while external control unit outside
Output display data voltage Vdata and the threshold voltage vt h of the driving transistor obtained are to data wire DATA, by display data
Voltage Vdata and threshold voltage vt h while write driver transistor DT grid, driving transistor DT conductings.
In the display stage, external control unit outside output low level signal to the first control line G1 and the second control line G2, this
When the first transistor T1 and second transistor T2 disconnect, in the presence of storage capacitance C1, driving transistor DT maintain conducting
State, luminescent device OLED anode voltage (i.e. the voltage of S points) are gradually risen to luminescent device OLED bright voltage, are lighted
Device OLED lights.
Thus, first pass through and external compensation is carried out to image element circuit to obtain the threshold voltage of accurate driving transistor, so
The threshold voltage that directly addition obtains in predetermined reference voltage and display data voltage when afterwards by internally compensating, so as to reach
To the purpose of the threshold voltage obtained using external compensation so that external compensation and internal compensation fully combine, not only can be real
Now to the compensation of threshold voltage, and the larger characteristic variations of driving transistor can be covered, the characteristic of driving transistor is become
Change and carry out real-Time Compensation, effectively avoid compensating magnetic hysteresis, and vestige caused by external compensation etc. can be eliminated so that display effect
Reach more preferable.
It should be noted that in an embodiment of the present invention, can also be to driving while being compensated to threshold voltage
The mobility of dynamic transistor compensates.For example, the threshold value of driving transistor is being obtained using above-mentioned external compensation mode
During voltage, if the detection data voltage of input data line is identical every time and the charging interval is identical, it can be obtained according to each
Charging voltage difference obtain the mobility of driving transistor, mobility offset is then obtained according to mobility, finally
Internal compensation is carried out to driving transistor according to the mobility offset of acquisition and threshold voltage, to realize to mobility and threshold
Compensated while threshold voltage.
Specifically, after the mobility offset of driving transistor is got by external compensation, aobvious shown in Fig. 3
Show the stage, high level signal can be exported by external control unit outside to the second control line G2, now second transistor T2 is turned on, together
When external control unit outside the mobility offset voltage corresponding with mobility offset is inputted to detection signal line
SenseLine, under display data voltage Vdata, threshold voltage vt h and mobility offset voltage collective effect, driving hair
Optical device lights, and realizes threshold voltage compensation and the mobility compensation to driving transistor simultaneously, further increases aobvious
Show effect.Wherein, the acquisition of mobility offset can be realized using prior art, and specific I will not elaborate.
In addition, it is necessary to explanation, it is given that the image element circuit shown in Fig. 2 is for only for ease of that the present invention will be described
Specific example, and the present invention compensation method be applicable not only to above-mentioned image element circuit, apply also for other image element circuit knots
Structure, specifically no longer illustrate here.
In summary, the compensation method of image element circuit according to embodiments of the present invention, outside benefit is first carried out to image element circuit
Repay to obtain the threshold voltage of driving transistor, internal benefit is then carried out to image element circuit according to the threshold voltage of driving transistor
Repay, so as to can not only realize the threshold voltage compensation to driving transistor, and the larger spy of driving transistor can be covered
Property change, the characteristic variations of driving transistor are carried out with real-Time Compensation, effectively avoids compensating magnetic hysteresis, and outside benefit can be eliminated
Vestige etc. caused by repaying so that display effect reaches more preferable.
Fig. 4 is the block diagram of the compensation device of image element circuit according to embodiments of the present invention.
In an embodiment of the present invention, image element circuit includes driving transistor, data wire and detection signal line.
As shown in figure 4, the compensation device 100 of the image element circuit of the embodiment of the present invention includes：External compensation unit 10 and interior
Portion's compensating unit 20.Wherein, external compensation unit 10 is used to carry out external compensation to image element circuit to obtain driving transistor
Threshold voltage, internal compensation unit 20 are used to carry out internal compensation to image element circuit according to the threshold voltage of driving transistor.
Specifically, in an embodiment of the present invention, when being compensated to image element circuit, external compensation unit is first passed through
10 pairs of image element circuits carry out external compensations to obtain the threshold voltage of driving transistor, then by internal compensation unit 20 according to obtaining
The threshold voltage of the driving transistor taken carries out internal compensation to image element circuit, so can not only realize to driving transistor
Threshold voltage compensation, solve the problems, such as that the display that threshold voltage shift is brought is uneven, and can cover driving transistor compared with
Big characteristic variations, real-Time Compensation is carried out to the characteristic variations of driving transistor, effectively avoids compensating magnetic hysteresis, and can eliminate
Vestige caused by external compensation etc. so that display effect reaches more preferable.
To enable those skilled in the art to be better understood upon the present invention, enter with reference to the specific example of the present invention
Row describes in detail.
According to one embodiment of present invention, external compensation unit 10 carries out external compensation to image element circuit to obtain driving
During the threshold voltage of transistor, wherein, external compensation unit 10 writes testing number by data wire to the grid of driving transistor
According to voltage so that driving transistor turns on, to be charged by the source electrode power supply of driving transistor to detection signal line, and lead to
Cross and obtain the charging voltage on detection signal line to obtain the threshold voltage of driving transistor.
In an embodiment of the present invention, external compensation unit 10 is used within the black plug time that picture is shown or without picture
External compensation is carried out to image element circuit during display.
That is, when carrying out external compensation to image element circuit, can be within the black plug time that picture is shown or without picture
Face compensates when showing.For example, as shown in figure 3,1 frame time that can show picture is divided into two parts, a part
To show the time, another part is the black plug time (can also claim blank areas), wherein the display time is used to control luminescent device to carry out
Luminous, the black plug time is used to carry out external compensation to image element circuit to obtain the threshold voltage of driving transistor.
Specifically, by taking the image element circuit shown in Fig. 2 as an example.As shown in Figures 2 and 3, within the black plug time that picture is shown,
External compensation unit 10 can be first passed through and export high level signal respectively to the first control line G1 and the second control line G2, now first
Transistor T1 and second transistor T2 are both turned on, while the output of external compensation unit 10 detects data voltage V1 (such as 3V) to data
Line DATA, driving transistor DT are turned on, and the detection data voltage V1 on data wire DATA passes through the first transistor T1, driving crystal
Pipe DT grid source electrode, second transistor T2 is charged to detection signal line Sense Line.Charge after a period of time, outside is mended
The charging voltage on the acquisition detection signal line Sense of unit 10 Line is repaid, driving transistor is then obtained according to the charging voltage
DT threshold voltage.Thus, the threshold voltage of driving transistor, Ran Hougen can be obtained by carrying out external compensation to image element circuit
Internal compensation is carried out to image element circuit according to the threshold voltage.
It should be noted that in an embodiment of the present invention, image element circuit can also be carried out using other manner outer
Portion's compensation is to obtain the threshold voltage of driving transistor, but aforesaid way is by a relatively simple, it is easy to accomplish, it is advantageous to adopt
The threshold voltage of driving transistor is obtained with above-mentioned external compensation mode.
According to one embodiment of present invention, internal compensation unit 20 is electric to pixel according to the threshold voltage of driving transistor
When road carries out internal compensation, wherein, the fluorescent lifetime that internal compensation unit 20 shows picture divides multiple stages, wherein, it is more
The individual stage includes internal compensation stage and data write phase；Compensated stage internally, internal compensation unit 20 pass through data wire
The threshold voltage of predetermined reference voltage and driving transistor is write to the grid of driving transistor so that driving transistor turns on, with
The source electrode power supply of driving transistor is charged；In data write phase, internal compensation unit 20 is by data wire to driving
The grid write-in display data voltage of transistor and the threshold voltage of driving transistor are so that driving transistor turns on, to pass through drive
Dynamic light emission drive transistor device lights.
Specifically, still by taking the image element circuit shown in Fig. 2 as an example.As shown in Figures 2 and 3, the internal compensation within the display time
The control luminescent device of unit 20 light and may include multiple stages, respectively reseting stage, internal compensation stage, data write-in
Stage and display stage.
Wherein, in reseting stage, internal compensation unit 20 exports high level signal to the first control line G1 and second respectively
Control line G2, now the first transistor T1 and second transistor T2 are both turned on, while internal compensation unit 20 exports preset reference
Voltage Vref and the threshold voltage vt h of the driving transistor obtained input resetting voltage (such as 0V) to detecing to data wire DATA
Signal wire Sense Line are surveyed, are resetted with the both end voltage to storage capacitor C1, while driving transistor DT is turned on.
Compensated stage internally, internal compensation unit 20 export low level signal to the controls of the first control line G1 and second respectively
Line G2 processed, now the first transistor T1 and second transistor T2 disconnect, in the presence of storage capacitor C1, driving transistor DT
Conducting state is continued to, to be charged by driving transistor DT to driving transistor DT source electrode power supply (i.e. S points), with
Carry out threshold voltage compensation.
In data write phase, internal compensation unit 20 exports high level signal to the first control line G1, and continues to output
Low level signal turns on to the second control line G2, now the first transistor T1, and second transistor T2 disconnects, while internal compensation list
20 output display data voltage Vdata of member and the driving transistor obtained threshold voltage vt h to data wire DATA, will display
Data voltage Vdata and threshold voltage vt h while write driver transistor DT grid, driving transistor DT conductings.
In the display stage, the output low level signal of internal compensation unit 20 to the first control line G1 and the second control line G2,
Now the first transistor T1 and second transistor T2 disconnect, and in the presence of storage capacitance C1, driving transistor DT maintains to lead
Logical state, luminescent device OLED anode voltage (i.e. the voltage of S points) are gradually risen to luminescent device OLED bright voltage, hair
Optical device OLED lights.
Thus, first pass through external compensation unit 10 and external compensation is carried out to image element circuit to obtain accurate driving transistor
Threshold voltage, it is straight in the predetermined reference voltage and display data voltage when then internally being compensated by internal compensation unit 20
Connect addition obtain threshold voltage, so as to reach utilize external compensation obtain threshold voltage purpose so that external compensation and
Internal compensation fully combines, and can not only realize the compensation to threshold voltage, and can cover the larger spy of driving transistor
Property change, the characteristic variations of driving transistor are carried out with real-Time Compensation, effectively avoids compensating magnetic hysteresis, and outside benefit can be eliminated
Vestige etc. caused by repaying so that display effect reaches more preferable.
It should be noted that in an embodiment of the present invention, threshold voltage is compensated in outside compensating unit 10
At the same time it can also be compensated to the mobility of driving transistor.For example, driven using above-mentioned external compensation mode to obtain
During the threshold voltage of dynamic transistor, if the detection data voltage of 10 each input data line of external compensation unit is identical and charges
Time is identical, then can obtain the mobility of driving transistor according to the charging voltage difference obtained every time, and then basis is moved
Shifting rate obtains mobility offset, and finally driving transistor is carried out according to the mobility offset of acquisition and threshold voltage
Internal compensation, to realize to being compensated while mobility and threshold voltage.
Specifically, after outside compensating unit 10 gets the mobility offset of driving transistor, shown in Fig. 3
The display stage, the output high level signal of internal compensation unit 20 to the second control line G2, now second transistor T2 conductings, simultaneously
Internal compensation unit 20 inputs the mobility offset voltage corresponding with mobility offset to detection signal line
SenseLine, under display data voltage Vdata, threshold voltage vt h and mobility offset voltage collective effect, driving hair
Optical device lights, and realizes threshold voltage compensation and the mobility compensation to driving transistor simultaneously, further increases display
Effect.Wherein, the acquisition modes of mobility offset can be realized using prior art, and specific I will not elaborate.
In addition, it is necessary to explanation, it is given that the image element circuit shown in Fig. 2 is for only for ease of that the present invention will be described
Specific example, and the present invention compensation device be applicable not only to above-mentioned image element circuit, apply also for other image element circuit knots
Structure, specifically no longer illustrate here.
In addition, in an embodiment of the present invention, external compensation unit 10 and internal compensation unit 20 can it is integrally disposed outside
In portion's control unit, for example, in the IC chip in GOA areas.
The compensation device of image element circuit according to embodiments of the present invention, image element circuit is carried out by external compensation unit outer
Portion is compensated to obtain the threshold voltage of driving transistor, and the threshold voltage pair by internal compensation unit according to driving transistor
Image element circuit carries out internal compensation, so as to can not only realize the threshold voltage compensation to driving transistor, and can cover
The larger characteristic variations of driving transistor, real-Time Compensation is carried out to the characteristic variations of driving transistor, effectively avoids compensating magnetic hysteresis,
And vestige caused by external compensation etc. can be eliminated so that display effect reaches more preferable.
Fig. 5 is the block diagram of image element circuit according to embodiments of the present invention.As shown in figure 5, the embodiment of the present invention
Image element circuit 1000 includes above-mentioned compensation device 100.
Image element circuit according to embodiments of the present invention, by above-mentioned compensation device, it can not only realize to image element circuit
The threshold voltage compensation of middle driving transistor, and the larger characteristic variations of driving transistor can be covered, to driving transistor
Characteristic variations carry out real-Time Compensation, effectively avoid compensating magnetic hysteresis, and vestige caused by external compensation etc. can be eliminated so that
Display effect reaches more preferable.
Fig. 6 is the block diagram of display device according to embodiments of the present invention.As shown in fig. 6, the embodiment of the present invention
Display device 10000 includes above-mentioned image element circuit 1000.
Display device according to embodiments of the present invention, by above-mentioned image element circuit, can effectively it eliminate because of external compensation
Caused vestige etc. so that display effect reaches more preferable.
In the description of the invention, it is to be understood that term " " center ", " longitudinal direction ", " transverse direction ", " length ", " width ",
" thickness ", " on ", " under ", "front", "rear", "left", "right", " vertical ", " level ", " top ", " bottom " " interior ", " outer ", " up time
The orientation or position relationship of the instruction such as pin ", " counterclockwise ", " axial direction ", " radial direction ", " circumference " be based on orientation shown in the drawings or
Position relationship, it is for only for ease of and describes the present invention and simplify description, rather than indicates or imply that signified device or element must
There must be specific orientation, with specific azimuth configuration and operation, therefore be not considered as limiting the invention.
In addition, term " first ", " second " are only used for describing purpose, and it is not intended that instruction or hint relative importance
Or the implicit quantity for indicating indicated technical characteristic.Thus, define " first ", the feature of " second " can be expressed or
Implicitly include at least one this feature.In the description of the invention, " multiple " are meant that at least two, such as two, three
It is individual etc., unless otherwise specifically defined.
In the present invention, unless otherwise clearly defined and limited, term " installation ", " connected ", " connection ", " fixation " etc.
Term should be interpreted broadly, for example, it may be fixedly connected or be detachably connected, or integrally；Can be that machinery connects
Connect or electrically connect；Can be joined directly together, can also be indirectly connected by intermediary, can be in two elements
The connection in portion or the interaction relationship of two elements, limited unless otherwise clear and definite.For one of ordinary skill in the art
For, the concrete meaning of above-mentioned term in the present invention can be understood as the case may be.
In the present invention, unless otherwise clearly defined and limited, fisrt feature can be with "above" or "below" second feature
It is that the first and second features directly contact, or the first and second features pass through intermediary mediate contact.Moreover, fisrt feature exists
Second feature " on ", " top " and " above " but fisrt feature are directly over second feature or oblique upper, or be merely representative of
Fisrt feature level height is higher than second feature.Fisrt feature second feature " under ", " lower section " and " below " can be
One feature is immediately below second feature or obliquely downward, or is merely representative of fisrt feature level height and is less than second feature.
In the description of this specification, reference term " one embodiment ", " some embodiments ", " example ", " specifically show
The description of example " or " some examples " etc. means specific features, structure, material or the spy for combining the embodiment or example description
Point is contained at least one embodiment or example of the present invention.In this manual, to the schematic representation of above-mentioned term not
Identical embodiment or example must be directed to.Moreover, specific features, structure, material or the feature of description can be with office
Combined in an appropriate manner in one or more embodiments or example.In addition, in the case of not conflicting, the skill of this area
Art personnel can be tied the different embodiments or example and the feature of different embodiments or example described in this specification
Close and combine.
Although embodiments of the invention have been shown and described above, it is to be understood that above-described embodiment is example
Property, it is impossible to limitation of the present invention is interpreted as, one of ordinary skill in the art within the scope of the invention can be to above-mentioned
Embodiment is changed, changed, replacing and modification.
Claims (10)
1. a kind of compensation method of image element circuit, it is characterised in that the image element circuit includes driving transistor, data wire and detectd
Signal wire is surveyed, the described method comprises the following steps：
External compensation is carried out to the image element circuit to obtain the threshold voltage of the driving transistor；
Internal compensation is carried out to the image element circuit according to the threshold voltage of the driving transistor.
2. the compensation method of image element circuit as claimed in claim 1, it is characterised in that within the black plug time that picture is shown or
External compensation is carried out to the image element circuit when person shows without picture.
3. the compensation method of image element circuit as claimed in claim 1 or 2, it is characterised in that described to enter to the image element circuit
Row external compensation to obtain the threshold voltage of the driving transistor, including：
Data voltage is detected so that the driving transistor is led by grid write-in of the data wire to the driving transistor
It is logical, to be charged by the source electrode power supply of the driving transistor to the detection signal line；
By obtaining the charging voltage on the detection signal line to obtain the threshold voltage of the driving transistor.
4. the compensation method of image element circuit as claimed in claim 1, it is characterised in that described according to the driving transistor
Threshold voltage carries out internal compensation to the image element circuit, including：
The fluorescent lifetime that picture is shown divides multiple stages, wherein, the multiple stage includes internal compensation stage and data
Write phase；
In the internal compensation stage, by the data wire to the grid of the driving transistor write predetermined reference voltage and
The threshold voltage of the driving transistor is so that driving transistor conducting, is entered with the source electrode power supply to the driving transistor
Row charging；
In the data write phase, by the data wire to the grid of the driving transistor write display data voltage and
The threshold voltage of the driving transistor is so that the driving transistor turns on, to drive photophore by the driving transistor
Part lights.
5. a kind of compensation device of image element circuit, it is characterised in that the image element circuit includes driving transistor, data wire and detectd
Signal wire is surveyed, the compensation device includes：
External compensation unit, it is electric to obtain the threshold value of the driving transistor for carrying out external compensation to the image element circuit
Pressure；
Internal compensation unit, internal compensation is carried out to the image element circuit for the threshold voltage according to the driving transistor.
6. the compensation device of image element circuit as claimed in claim 5, it is characterised in that the external compensation unit is used to draw
External compensation is carried out to the image element circuit when showing in the black plug time that face is shown or without picture.
7. the compensation device of the image element circuit as described in claim 5 or 6, it is characterised in that the external compensation unit is to institute
When stating image element circuit progress external compensation to obtain the threshold voltage of the driving transistor, wherein,
The external compensation unit by grid from the data wire to the driving transistor write-in detection data voltage so that
The driving transistor conducting, to be charged by the source electrode power supply of the driving transistor to the detection signal line, and
By obtaining the charging voltage on the detection signal line to obtain the threshold voltage of the driving transistor.
8. the compensation device of image element circuit as claimed in claim 5, it is characterised in that the internal compensation unit is according to
When the threshold voltage of driving transistor carries out internal compensation to the image element circuit, wherein,
The fluorescent lifetime that the internal compensation unit shows picture divides multiple stages, wherein, the multiple stage includes interior
Portion's compensated stage and data write phase；
In the internal compensation stage, the internal compensation unit is write by the data wire to the grid of the driving transistor
Enter the threshold voltage of predetermined reference voltage and the driving transistor so that the driving transistor turns on, with brilliant to the driving
The source electrode power supply of body pipe is charged；
In the data write phase, the internal compensation unit is write by the data wire to the grid of the driving transistor
Enter the threshold voltage of display data voltage and the driving transistor so that the driving transistor turns on, to pass through the driving
Light emission drive transistor device lights.
9. a kind of image element circuit, it is characterised in that including the compensation device as any one of claim 5-8.
10. a kind of display device, it is characterised in that including image element circuit as claimed in claim 9.
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| CN201711271030.6A CN107863067A (en) | 2017-12-05 | 2017-12-05 | Display device, image element circuit and its compensation method and compensation device |
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| CN201711271030.6A CN107863067A (en) | 2017-12-05 | 2017-12-05 | Display device, image element circuit and its compensation method and compensation device |
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| CN201711271030.6A Pending CN107863067A (en) | 2017-12-05 | 2017-12-05 | Display device, image element circuit and its compensation method and compensation device |
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