CN107146578B - A kind of driving compensation circuit and driving compensation method, display device - Google Patents
A kind of driving compensation circuit and driving compensation method, display device Download PDFInfo
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- CN107146578B CN107146578B CN201710538861.9A CN201710538861A CN107146578B CN 107146578 B CN107146578 B CN 107146578B CN 201710538861 A CN201710538861 A CN 201710538861A CN 107146578 B CN107146578 B CN 107146578B
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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
- G09G3/3233—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 with pixel circuitry controlling the current through the light-emitting element
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Abstract
The present invention provides a kind of driving compensation circuit and driving compensation method, display device, be related to field of display technology, can overcome in the prior art acquire driving voltage compensate by way of brought by adverse effect.Driving compensation circuit includes driving unit, current amplification unit and processing modulation unit；Driving unit control terminal is connected with scanning signal end, first input end is connected with data line, output end is connected with display unit and current amplification unit first input end, control terminal is connected with control signal end, first output end is connected with processing modulation unit input terminal, and processing modulation unit output end is connected with data line；The voltage signal that driving unit provides data line is converted to current signal, output to display unit；Current amplification unit acquisition amplification current signal；It handles modulation unit and current signal is converted into drive voltage signal, carry out processing modulation, modulated signal is transmitted to data line.Above-mentioned driving compensation circuit is for performing image display.
Description
Technical field
The present invention relates to field of display technology more particularly to a kind of driving compensation circuit and driving compensation methodes, display dress
It sets.
Background technique
AMOLED (Active Matrix/Organic Light Emitting Diode, active-matrix organic light emission two
Polar body panel) display has many advantages, such as ultra-thin, high colour gamut, high contrast, it is widely applied in display field.
When pixel-driving circuit of the large-area manufacturing thin film transistor (TFT) to form displayer, on the one hand, by
The numerical value of the limitation of technique, the electrical parameters such as threshold voltage, the electron mobility of the thin film transistor (TFT) of different location can not be protected
It holds unanimously, this will result in the current difference and luminance difference of Organic Light Emitting Diode, that is, mura phenomenon occurs.In addition, in length
Under the pressurization and high temperature of time, the threshold voltage of the thin film transistor (TFT) of different location will appear different degrees of drift, this can make
Difference is shown at brightness, that is, ghost phenomena occurs.
In order to overcome the problems referred above, the mode for generalling use external compensation compensates driving circuit, existing to eliminate mura
As and ghost phenomena.External compensation is to come out the information extraction of thin film transistor (TFT) or Organic Light Emitting Diode, then pass through dedicated
Integrated circuit is come the mode that compensates.In the prior art, the mode for generalling use voltage-type external compensation compensates, i.e.,
The driving voltage of Organic Light Emitting Diode is extracted by certain mode, and digital signal is converted by analog-digital converter
It is handled, is finally sent to single-chip microcontroller and carries out data fine tuning.Although voltage-type external compensation has, driving speed is very fast, compensates effect
The preferable advantage of fruit, but there are still two drawbacks for voltage-type external compensation mode: and on the one hand, the drive voltage signal extracted is very
It is easy to be interfered, this inevitably has some impact on compensation；On the other hand, with displayer size
Increase and the raising of resolution ratio, the parasitic capacitance of display panel is also just increasing, this results in the driving in the set time
The numerical value of voltage is lower, and when the lower driving voltage of logarithm carries out analog-to-digital conversion, will propose to precision of A/D converter
Requirements at the higher level.
Summary of the invention
The present invention provides a kind of driving compensation circuit and driving compensation methodes, display device, can overcome the prior art
In acquire driving voltage compensate by way of brought by adverse effect.
In order to achieve the above objectives, the present invention adopts the following technical scheme:
The first aspect of the present invention provides a kind of driving compensation circuit, including driving unit, current amplification unit and place
Manage modulation unit；Wherein, the control terminal of the driving unit is connected with scanning signal end, the first input end of the driving unit
It is connected with data line, the second input terminal of the driving unit is connected with the first power supply signal end, the output of the driving unit
End is connected with the first input end of display unit and the current amplification unit respectively, the second input of the current amplification unit
End is connected with second source signal end, and the control terminal of the current amplification unit is connected with control signal end, the Current amplifier
First output end of unit with it is described processing modulation unit input terminal be connected, the second output terminal of the current amplification unit and
The ground terminal is connected, and the output end of the processing modulation unit is connected with the data line；
Under the action of the driving unit is used for the scanning signal provided by the scanning signal end, by the data line
The voltage signal of offer is converted to current signal, and the current signal converted is exported to the display unit；
Under the action of the current amplification unit is used to control signal provided by the control signal end, described in acquisition
Current signal amplifies the current signal；
The processing modulation unit is used to amplified current signal being converted to drive voltage signal, to the driving electricity
Pressure signal is handled and is modulated, and modulated drive voltage signal is transmitted to the data line.
In driving compensation circuit provided by the present invention, including driving unit, current amplification unit, processing modulation unit
With four part of display unit.The first input end of driving unit is connected with data line, the output end of driving unit respectively with display
Unit is connected with the first input end of current amplification unit, and the first output end of current amplification unit is defeated with processing modulation unit
Enter end to be connected, the output end for handling modulation unit is connected with data line.Based on this kind of connection relationship, driving unit mentions data line
After the voltage signal of confession is converted to current signal, current amplification unit can be acquired and amplify to the current signal converted,
Then, amplified current signal is converted to drive voltage signal by processing modulation unit, and is adjusted to drive voltage signal
System, after the completion of modulation, is transmitted to data line for modulated drive voltage signal, to realize compensation.When processing modulation unit
After modulated drive voltage signal is transmitted to data line, driving unit can receive modulated driving electricity from data line
Signal is pressed, modulated drive voltage signal is converted into driving current signal, and the current signal converted is exported to aobvious
Show unit, so that display device be avoided mura phenomenon and afterimage phenomena occur.Due to driving compensation circuit provided by the present invention
Signal collected is current signal, therefore be can avoid in the prior art by way of acquiring drive voltage signal and compensating
Brought adverse effect.On the other hand, due to being equipped with current amplification unit in driving compensation circuit, thus can be to current signal
It amplifies, that is, increases the numerical value of current signal, so, current signal is handled by handling modulation unit
When modulation, so that it may reduce the requirement to processing modulation unit precision, to improve the applicability of the driving compensation circuit, and have
Develop conducive to display device in large size and high-resolution.
The second aspect of the present invention provides a kind of driving compensation method, applied to the driving compensation as described in embodiment one
In circuit, the driving compensation method includes:
Under the action of the scanning signal provided by the scanning signal end, the voltage signal that the data line is provided turns
It is changed to current signal；
Under the action of controlling signal provided by the control signal end, converted current signal is acquired, it will be described
Current signal amplifies；
Amplified current signal is converted into drive voltage signal, the drive voltage signal is handled and adjusted
System, is transmitted to the data line for modulated drive voltage signal；
Under the action of the scanning signal provided by the scanning signal end, modulated drive that the data line is provided
Dynamic voltage signal is converted to driving current signal, and the driving current signal converted is exported to display unit.
Driving provided by the beneficial effect and the first aspect of the present invention of driving compensation method provided by the present invention is mended
The beneficial effect for repaying circuit is identical, and details are not described herein again.
The third aspect of the present invention provides a kind of display device, mends including the driving as described in the first aspect of the present invention
Repay circuit.
Driving compensation electricity provided by the beneficial effect and the first aspect of the present invention of display device provided by the present invention
The beneficial effect on road is identical, and details are not described herein again.
Detailed description of the invention
In order to more clearly explain the embodiment of the invention or the technical proposal in the existing technology, to embodiment or will show below
There is attached drawing needed in technical description to be briefly described, it should be apparent that, the accompanying drawings in the following description is only this
Some embodiments of invention for those of ordinary skill in the art without creative efforts, can be with
Other attached drawings are obtained according to these attached drawings.
Fig. 1 is the structural schematic diagram one of driving compensation circuit provided by the embodiment of the present invention one；
Fig. 2 is the structural schematic diagram two of driving compensation circuit provided by the embodiment of the present invention one；
Fig. 3 is the structural schematic diagram three of driving compensation circuit provided by the embodiment of the present invention one；
Fig. 4 is the schematic diagram one of driving compensation method provided by the embodiment of the present invention two；
Fig. 5 is the schematic diagram two of driving compensation method provided by the embodiment of the present invention two；
Fig. 6 is the schematic diagram three of driving compensation method provided by the embodiment of the present invention two.
Description of symbols:
1- driving unit；2- current amplification unit；
21- first switch module；The first amplification module of 22-；
23- second switch module；The second amplification module of 24-；
31- integrator；32- analog-digital converter；
33- logic card；4- display unit；
DATA- data line；The first power supply signal of OVDD- end；
OLED- Organic Light Emitting Diode；GND- ground terminal；
AVDD- second source signal end；SW- control signal end；
Vref- reference voltage end；The first field-effect tube of M1-；
The second field-effect tube of M2-；M3- third field-effect tube；
The 4th field-effect tube of M4-；The 5th field-effect tube of M5-；
The 6th field-effect tube of M6-；The 7th field-effect tube of M7-；
The 8th field-effect tube of M8-；The 9th field-effect tube of M9-；
The tenth field-effect tube of M10-；T1- first film transistor；
The second thin film transistor (TFT) of T2-；C1- first capacitor；
The second capacitor of C2-；K- switch；
The first operational amplifier of OP1-；OP2- second operational amplifier；
OP3- third operational amplifier；SCAN- scanning signal end.
Specific embodiment
In order to make the foregoing objectives, features and advantages of the present invention clearer and more comprehensible, implement below in conjunction with the present invention
Attached drawing in example, technical scheme in the embodiment of the invention is clearly and completely described.Obviously, described embodiment
Only a part of the embodiment of the present invention, instead of all the embodiments.Based on the embodiments of the present invention, the common skill in this field
Art personnel all other embodiment obtained without creative labor belongs to the model that the present invention protects
It encloses.
Embodiment one
As shown in Figure 1, present embodiments providing a kind of driving compensation circuit, it to be used for driving display unit 4.Driving compensation
Circuit specifically includes driving unit 1, current amplification unit 2, processing modulation unit 3.
Wherein, the control terminal of driving unit 1 is connected with scanning signal end SCAN, the first input end and number of driving unit 1
It is connected according to line DATA, the second input terminal of driving unit 1 is connected with the first power supply signal end OVDD, the output end of driving unit 1
It is connected respectively with the first input end of display unit 4 and current amplification unit 2, the second input terminal of current amplification unit 2 and
Two power supply signal end AVDD are connected, and the control terminal of current amplification unit 2 is connected with control signal end SW, current amplification unit 2
First output end is connected with the input terminal of processing modulation unit 3, second output terminal and the ground terminal GND phase of current amplification unit 2
Even, the output end of processing modulation unit 3 is connected with data line DATA.
Specifically, under the action of driving unit 1 is used for the scanning signal provided by the SCAN of scanning signal end, by data line
The voltage signal that DATA is provided is converted to current signal, and the current signal converted is exported to the display unit 4.Electric current is put
Under the action of big unit 2 is used to control signal provided by control signal end SW, current signal is acquired, current signal is carried out
Amplification.Processing modulation unit 3 is used to amplified current signal being converted to drive voltage signal, carries out to drive voltage signal
Processing and modulation, are transmitted to data line DATA for modulated drive voltage signal.
In the driving compensation circuit provided by the present embodiment, including driving unit 1, current amplification unit 2, processing modulation
Unit 3.The first input end of driving unit 1 is connected with data line DATA, the output end of driving unit 1 respectively with display unit 4
It is connected with the first input end of current amplification unit 2, the first output end of current amplification unit 2 is defeated with processing modulation unit 3
Enter end to be connected, the output end of processing modulation unit 3 is connected with data line DATA.Based on this kind of connection relationship, driving unit 1 will be counted
After being converted to current signal according to the voltage signal that line DATA is provided, current amplification unit 2 can carry out the current signal converted
It acquires and amplifies, then, amplified current signal is converted to drive voltage signal by processing modulation unit 3, and to driving electricity
Pressure signal is modulated, and after the completion of modulation, modulated drive voltage signal is transmitted to data line DATA, to realize benefit
It repays.After modulated drive voltage signal is transmitted to data line DATA by processing modulation unit 3, driving unit 1 can be from data
Modulated drive voltage signal is received in line DATA, and modulated drive voltage signal is converted into driving current signal,
And export the current signal converted to display unit 4, so that display device be avoided mura phenomenon and afterimage phenomena occur.By
The driving compensation circuit signal collected provided by the present embodiment is current signal, therefore can avoid passing through in the prior art
Adverse effect brought by the mode that acquisition drive voltage signal compensates.On the other hand, due to being set in driving compensation circuit
There is current amplification unit 2, thus current signal can be amplified, that is, increase the numerical value of current signal, so, logical
Cross processing modulation unit 3 to current signal carry out processing modulation when, so that it may reduce to processing 3 precision of modulation unit requirement, from
And the applicability of the driving compensation circuit is improved, and be conducive to display device and develop in large size and high-resolution.
Current amplification unit 2 specifically includes first switch module 21, the first amplification module 22, second closes module 23 and second
Amplification module 24.
Wherein, the control terminal of first switch module 21 is connected with control signal end SW, the input terminal of first switch module 21
It is connected with the output end of driving unit 1, the output end of first switch module 21 is connected with the input terminal of the first amplification module 22, the
First output end of one amplification module 22 is connected with ground terminal GND.First switch module 21 is used under the influence of control signals,
The current signal that driving unit 1 is converted is transmitted to the first amplification module 22；First amplification module 22 is used to be converted
Current signal carries out M times and amplifies.
The control terminal of second pass module 23 is connected with control signal end SW, and second closes the input terminal of module 23 and the first amplification
The second output terminal of module 22 is connected, and the output end of the second pass module 23 is connected with the first input end of the second amplification module 24,
Second input terminal of the second amplification module 24 is connected with second source signal end AVDD, the output end of the second amplification module 24 and place
The input terminal for managing modulation unit 3 is connected.Second, which closes module 23, is used under the influence of control signals, will be through the first amplification module
22M times of amplified current signal is transmitted to the second amplification module 24；Second amplification module 24 is used for M times of amplified electric current
Signal carries out N times and amplifies, and M × N times of amplified current signal is transmitted to processing modulation unit 3.Wherein, M is to be less than greater than 1
20 positive integer, N are the positive integer greater than 1 less than 20.
It is each with it when current amplification unit 2 specifically includes the first amplification module 22 and the second amplification module 24, and respectively
When self-corresponding first switch module 21 and the second pass module 23, the current signal that driving unit 1 is converted can be amplified M × N
Times, in this way, when carrying out processing modulation to current signal by processing modulation unit 3, so that it may reduce to 3 essence of processing modulation unit
The requirement of degree, to improve the applicability of the driving compensation circuit.
In addition, carrying out grade using two amplification modules compared with amplifying using single amplification module to current signal
Connection amplification, can reduce the requirement of the amplification factor to single amplification module, be also easy in the manufacture craft of amplification module in this way
It realizes.Also, current signal is amplified by the way of Cascaded amplification, current signal can be amplified to a certain extent
Higher multiple.
Specifically, as shown in figure 3, first switch module 21 includes the first field-effect tube M1, the control of the first field-effect tube M1
Pole processed is connected with control signal end SW, and the first pole of the first field-effect tube M1 is connected with the output end of driving unit 1.
First amplification module 22 includes the second field-effect tube M2, third field-effect tube M3, the 4th field-effect tube M4, the 5th
Effect pipe M5 and the first operational amplifier OP1.Wherein, the control electrode of the second field-effect tube M2 and the second of the second field-effect tube M2
Pole, the second pole of the first field-effect tube M1, third field-effect tube M3 control electrode be respectively connected with, the first of the second field-effect tube M2
Pole is extremely connected with the second of third field-effect tube M3, the first pole of third field-effect tube M3 and the first pole of the 4th field-effect tube M4
It is connected respectively with ground terminal GND, the control electrode of third field-effect tube M3 is connected with the control electrode of the 4th field-effect tube M4, and the 4th
The second pole of effect pipe M4 is extremely connected with the first of the 5th field-effect tube M5, and mould is closed with second in the second pole of the 5th field-effect tube M5
The input terminal of block 23 is connected.The positive input of first operational amplifier OP1 is extremely connected with the first of the second field-effect tube M2, the
The negative input of one operational amplifier OP1 is extremely connected with the second of the 4th field-effect tube M4, and the first operational amplifier OP1's is defeated
Outlet is connected with the control electrode of the 5th field-effect tube M5.
Wherein, the first field-effect tube M1 is p-type field-effect tube, the second field-effect tube M2, third field-effect tube M3, the 4th
Effect pipe M4 and the 5th field-effect tube M5 is N-type field-effect tube.The channel width-over-length ratio and third field-effect of 4th field-effect tube M4
The ratio of the channel width-over-length ratio of pipe M3 is M.
Second, which closes module 23, includes the 6th field-effect tube M6, control electrode and the control signal end SW phase of the 6th field-effect tube M6
Even, the second pole of the 6th field-effect tube M6 is extremely connected with the second of the 5th field-effect tube M5.
Second amplification module 24 includes the 7th field-effect tube M7, the 8th field-effect tube M8, the 9th field-effect tube M9, the tenth
Effect pipe M10 and second operational amplifier OP2.Wherein, the of the control electrode of the 7th field-effect tube M7 and the 7th field-effect tube M7
Two poles, the first pole of the 6th field-effect tube M6, the 8th field-effect tube M8 control electrode be respectively connected with, the of the 7th field-effect tube M7
One pole is extremely connected with the second of the 8th field-effect tube M8, the first pole of the 8th field-effect tube M8 and the first of the 9th field-effect tube M9
Pole is connected with second source signal end AVDD respectively, the control electrode of the 8th field-effect tube M8 and the control electrode of the 9th field-effect tube M9
It is connected, the second pole of the 9th field-effect tube M9 is extremely connected with the first of the tenth field-effect tube M10, and the of the tenth field-effect tube M10
Two poles are connected with the input terminal of processing modulation unit 3.
The positive input of second operational amplifier OP2 is extremely connected with the first of the 7th field-effect tube M7, and the second operation is put
The negative input of big device OP2 is extremely connected with the second of the 9th field-effect tube M9, the output end of second operational amplifier OP2 and the
The control electrode of ten field-effect tube M10 is connected.
Wherein, the 6th field-effect tube M6, the 7th field-effect tube M7, the 8th field-effect tube M8, the 9th field-effect tube M9 and
Ten field-effect tube M10 are p-type field-effect tube.The channel width-over-length ratio of 9th field-effect tube M9 and the ditch road width of the 8th field-effect tube M8
The ratio of long ratio is N.
Preferably, the first field-effect tube M10 of field-effect tube M1~the tenth is Metal-oxide-semicondutor (metal-
Oxid-semiconductor, abbreviation MOS) field effect transistor.
It is specifically described below with reference to working principle of the Fig. 3 to current amplification unit 2:
After voltage signal is converted to current signal by driving unit 1, control signal end SW to the first field-effect tube M1 and
The grid of 6th field-effect tube M6 provides control signal, at this point, the first field-effect tube M1 and the 6th field-effect tube M6 believes in control
It is connected under the action of number.
Second field-effect tube M2, third field-effect tube M3, the 4th field-effect tube M4 and the 5th field-effect tube M5 are constituted altogether
Source source common-gate current mirror.Basic principle based on common-source common-gate current mirror structure is it is found that if the electric current that will be converted through driving unit 1
Signal is considered as reference current signal, theoretically for, reference current signal amplifies via the common-source common-gate current mirror of this kind of structure
Afterwards, channel width-over-length ratio of the multiple of Current amplifier equal to the 4th field-effect tube M4 and the channel width-over-length ratio of third field-effect tube M3
Ratio, as M.And the output impedance of the common-source common-gate current mirror is ro4 × gm5 × ro5, wherein ro4 is the 4th field-effect tube
The internal resistance of M4, gm5 are the mutual conductance of the 5th field-effect tube M5, and ro5 is the internal resistance of the 5th field-effect tube M5.
It should be noted that according to saturation current formulaIt is found that field-effect tube is full
It is related with (1+ γ Vds) with the size of electric current, wherein μ is electron mobility, and W/L is the channel width-over-length ratio of field-effect tube, Vgs-
VthFor overdrive voltage, (1+ γ Vds) is the minorant of saturation current formula.
Under normal conditions, for multiple field-effect tube in the common-source common-gate current mirror in the first amplification module 22,
Its respective source-drain voltage VdsIt is difficult to keep equal, this results in the precision of common-source common-gate current mirror limited, that is, only relies on second
The cascode current that field-effect tube M2, third field-effect tube M3, the 4th field-effect tube M4 and the 5th field-effect tube M5 are constituted
Mirror is difficult to reach M times to the amplification factor of current signal.At this moment, due to including that the first operation is put in the first amplification module 22
Big device OP1, the equal characteristic of the numerical value for the signal for forcing its positive input and negative input to input based on operational amplifier,
It can guarantee that the drain voltage of the 4th field-effect tube M4 and third field-effect tube M3 are equal, that is, guarantee the 4th field-effect tube M4
With the source-drain voltage V of third field-effect tube M3dsIt is equal.According to saturation current formula it is found that when the 4th field-effect tube M4 and third
The source-drain voltage V of field-effect tube M3dsWhen equal, the saturation current of the 4th field-effect tube M4 and third field-effect tube M3 are only each with it
From channel width-over-length ratio it is directly proportional, be no longer influenced by source-drain voltage VdsInfluence, and then enable the first amplification module 22 realize to electric current
Signal is accurately amplified to M times.
Further, since including the first operational amplifier OP1 in the first amplification module 22, the first operational amplifier OP1 may be used also
The numerical value of output impedance is improved A times, the numerical value of output impedance at this time is A × ro4 × gm5 × ro5, wherein A is the first fortune
Calculate the gain of amplifier OP1.Corresponding, the mismatch of electric current is reduced to 1/ (A × gm5 × ro5) times at this time.
And since the 6th field-effect tube M6 is also on state at this time, through the first accurately amplification of amplification module 22
M times of current signal is flowed out from the 5th field-effect tube M5, by the 6th field-effect tube M6 is transmitted to the 7th field-effect tube M7.
7th field-effect tube M7, the 8th field-effect tube M8, the 9th field-effect tube M9 and the tenth field-effect tube M10 are constituted altogether
Source source common-gate current mirror is accurately exaggerated M times of current signal through the first amplification module 22, by common-source common-gate current mirror and with
After the processing of the connected second operational amplifier OP2 of common-source common-gate current mirror, it is accurately amplified to N times, at this moment, current signal again
It is exaggerated M × N times altogether through the first amplification module 22 and the second amplification module 24.
Finally, be transmitted in processing modulation unit 3 through M × N times of amplified current signal by the tenth field-effect tube M10,
Processing and modulation are completed to amplified current signal by processing modulation unit 3.
Referring again to Fig. 3, handles modulation unit 3 and specifically include integrator 31, analog-digital converter 32 and logic card 33.Its
In, the positive input of integrator 31 is connected with reference voltage end Vref, the negative input and Current amplifier list of integrator 31
First output end of member 2 is connected, and the output end of integrator 31 is connected with the input terminal of analog-digital converter 32, analog-digital converter 32
Output end is connected with the input terminal of logic card 33, and the output end of logic card 33 is connected with data line DATA.Wherein, integrator 31 is used
In amplified current signal is converted to drive voltage signal.Analog-digital converter 32 is used to drive voltage signal being converted to n
The digital drive voltage signal of position.Logic card 33 utilizes included field programmable gate array (Field-Programmable
Gate Array, abbreviation FPGA), digital drive voltage signal is modulated, and by modulated digital drive voltage signal
It is transmitted to data line DATA.
Specifically, integrator 31 includes switch K, first capacitor C1 and third operational amplifier OP3.Wherein, Current amplifier
First output end of unit 2 respectively with one end of switch K, the first pole plate of first capacitor C1 and third operational amplifier OP3
Negative input is connected, and the positive input of third operational amplifier OP3 is connected with reference voltage end Vref, and switch K's is another
End, the second pole plate of first capacitor C1, third operational amplifier OP3 output end respectively with the input terminal phase of analog-digital converter 32
Even.After current amplification unit 2 completes enhanced processing to current signal, the switch K of integrator 31 is disconnected, and integrator 31 is exported
Drive voltage signal reference voltage provided by the reference voltage end Vref begin to decline, it is defeated according to different current signals
The drive voltage signal of different numerical value out.
It should be noted that since current amplification unit 2 is exaggerated current signal, amplified electric current
When signal passes through integrator 31 again and handled, on the one hand the requirement to the precision of integrator 31 is also just corresponding is reduced, another party
Face also can reduce the size of the capacitance of first capacitor C1 included in integrator 31, to accelerate C1 pairs of first capacitor
The charge/discharge speed of current signal shortens integrator 31 to the charge and discharge time of current signal, and then shortens the compensation time.
Specifically, referring again to Fig. 3, display unit 4 includes Organic Light Emitting Diode OLED, and driving unit 1 includes the
One thin film transistor (TFT) T1, the second thin film transistor (TFT) T2 and the second capacitor C2.Wherein, the control electrode of first film transistor T1 with sweep
It retouches signal end SCAN to be connected, the second pole of first film transistor T1 is connected with data line DATA, first film transistor T1's
First pole is respectively connected with the control electrode of the second thin film transistor (TFT) T2, the first pole plate of the second capacitor C2, the second thin film transistor (TFT)
The first pole of T2 is connected with the first power supply signal end OVDD, the second pole of the second thin film transistor (TFT) T2 and the second of the second capacitor C2
Pole plate, the anode of Organic Light Emitting Diode OLED, current amplification unit 2 first input end be respectively connected with.Wherein, the first film
Transistor T1 is used under the control of scanning signal, by the write-in of modulated drive voltage signal provided by data line DATA the
Two thin film transistor (TFT) T2, the second thin film transistor (TFT) T2 are for being converted to driving current signal for drive voltage signal and being transmitted
To the anode of Organic Light Emitting Diode OLED, so that Organic Light Emitting Diode OLED be driven to shine.
Embodiment two
A kind of driving compensation method is present embodiments provided, which is applied to the drive as described in embodiment one
In dynamic compensation circuit.
As shown in figure 4, driving compensation method provided by the present embodiment specifically includes:
Step S1: under the action of the scanning signal provided by scanning signal end, the voltage signal that data line is provided turns
It is changed to current signal.
Step S2: under the action of controlling signal provided by control signal end, converted current signal is acquired, and will
Current signal amplifies.
Step S3: being converted to drive voltage signal for amplified current signal, to drive voltage signal carry out processing and
Modulation, is transmitted to data line for modulated drive voltage signal.
Step S4: under the action of the scanning signal provided by scanning signal end, modulated drive that data line is provided
Dynamic voltage signal is converted to driving current signal, and the driving current signal converted is exported to display unit.
In the driving compensation method provided by the present embodiment, the voltage signal that data line is provided is converted to current signal
Afterwards, the current signal converted can be acquired and is amplified, then, amplified current signal is converted into driving voltage letter
Number, and drive voltage signal is modulated, after the completion of modulation, modulated drive voltage signal is transmitted to data line, from
And realize compensation.After modulated drive voltage signal is transmitted to data line, the modulated driving that data line is provided is electric
Pressure signal is converted to driving current signal, and the driving current signal converted is exported to display unit, to avoid showing
There is mura phenomenon and afterimage phenomena in device.As being driven in compensation method provided by the present embodiment, signal collected
For current signal, thus can avoid in the prior art by way of acquiring drive voltage signal and compensating brought by it is bad
It influences.On the other hand, since the driving compensation method can also amplify current signal, that is, the number of current signal is increased
Value, so, when carrying out processing modulation to current signal, so that it may reduce to the processing tune for handling modulated current signal
The requirement of unit precision processed, to improve the applicability of the driving compensation method.
When the current amplification unit in driving compensation circuit includes first switch module, the first amplification module, second switch
When module and the second amplification module, as shown in figure 5, step S2 is specifically included:
Step S21: under the influence of control signals, first switch module acquires converted current signal, will be acquired
Current signal be transmitted to the first amplification module, the first amplification module amplifies the current signal converted progress for M times.
Step S22: under the influence of control signals, second switch module will be through M times of amplified electricity of the first amplification module
Stream signal is transmitted to the second amplification module, and M times of amplified current signal is carried out N times and amplified by the second amplification module.Wherein, M
For the positive integer greater than 1 less than 20, N is the positive integer greater than 1 less than 20.
The current signal that driving unit is converted amplifies M × N times, in this way, being believed by processing modulation unit electric current
When number carrying out processing modulation, so that it may the requirement to processing modulation unit precision is reduced, to improve the suitable of the driving compensation circuit
The property used.
In addition, carrying out Cascaded amplification to current signal, the requirement of the amplification factor to single amplification module can be reduced, in this way
It is also easy to realize in the manufacture craft of amplification module.Also, current signal is amplified by the way of Cascaded amplification,
Higher multiple can be amplified to current signal to a certain extent.
When driving the processing modulation unit in compensation circuit includes integrator, analog-digital converter and logic card, such as Fig. 6 institute
Show.Step S3 is specifically included:
Step S31: amplified current signal is converted to drive voltage signal by integrator.
Step S32: drive voltage signal is converted to digital drive voltage signal by analog-digital converter.
Step S33: logic card is modulated digital drive voltage signal, and modulated digital drive voltage signal is passed
Transport to data line.
Embodiment three
A kind of display device is present embodiments provided, which includes the driving compensation circuit as described in embodiment one
And display unit.
In the display device provided by the present embodiment, the signal of output to display unit can be compensated, to disappear
Except mura phenomenon and afterimage phenomena, the display unit for example can be Organic Light Emitting Diode.Also, when due to compensating
Signal collected is current signal, therefore also can avoid the side compensated in the prior art by acquiring drive voltage signal
Adverse effect brought by formula is conducive to develop in large size and high-resolution.
The foregoing is merely a specific embodiment of the invention, but scope of protection of the present invention is not limited thereto, any
In the technical scope disclosed by the present invention, any changes or substitutions that can be easily thought of by those familiar with the art, all answers
It is included within the scope of the present invention.Therefore, protection scope of the present invention should be with the scope of protection of the claims
It is quasi-.
Claims (10)
1. a kind of driving compensation circuit is used for driving display unit, which is characterized in that including driving unit, current amplification unit
With processing modulation unit；Wherein, the control terminal of the driving unit is connected with scanning signal end, and the first of the driving unit is defeated
Enter end to be connected with data line, the second input terminal of the driving unit is connected with the first power supply signal end, the driving unit
Output end is connected with the first input end of the display unit and the current amplification unit respectively, the current amplification unit
Second input terminal is connected with second source signal end, and the control terminal of the current amplification unit is connected with control signal end, described
First output end of current amplification unit is connected with the input terminal of the processing modulation unit, and the second of the current amplification unit
Output end is connected with ground terminal, and the output end of the processing modulation unit is connected with the data line；
Under the action of the driving unit is used for the scanning signal provided by the scanning signal end, the data line is provided
Voltage signal be converted to current signal, the current signal converted is exported to the display unit；
Under the action of the current amplification unit is used to control signal provided by the control signal end, the electric current is acquired
Signal amplifies the current signal；
The processing modulation unit is used to amplified current signal being converted to drive voltage signal, believes the driving voltage
It number is handled and is modulated, modulated drive voltage signal is transmitted to the data line.
2. driving compensation circuit according to claim 1, which is characterized in that the current amplification unit includes first switch
Module, the first amplification module, second switch module and the second amplification module；
Wherein, the control terminal of the first switch module is connected with the control signal end, the input of the first switch module
End is connected with the output end of the driving unit, the input of the output end of the first switch module and first amplification module
End is connected, and the first output end of first amplification module is connected with the ground terminal；The first switch module is used in institute
Under the action of stating control signal, the current signal that the driving unit is converted is transmitted to first amplification module；Described
One amplification module is used to the current signal converted carrying out M times to amplify；
The control terminal of the second switch module is connected with the control signal end, the input terminal of the second switch module and institute
The second output terminal for stating the first amplification module is connected, and the of the output end of the second switch module and second amplification module
One input terminal is connected, and the second input terminal of second amplification module is connected with the second source signal end, and described second puts
The output end of big module is connected with the input terminal of the processing modulation unit；The second switch module is used to believe in the control
Under the action of number, second amplification module will be transmitted to through M times of the first amplification module amplified current signal；It is described
Second amplification module is used to M times of amplified current signal carrying out N times to amplify, and M × N times of amplified current signal is transmitted
To the processing modulation unit；Wherein, M is the positive integer greater than 1 less than 20, and N is the positive integer greater than 1 less than 20.
3. driving compensation circuit according to claim 2, which is characterized in that
The first switch module includes the first field-effect tube, the control electrode and the control signal end of first field-effect tube
It is connected, the first pole of first field-effect tube is connected with the output end of the driving unit；
First amplification module include the second field-effect tube, third field-effect tube, the 4th field-effect tube, the 5th field-effect tube and
First operational amplifier；Wherein, the second pole of the control electrode of second field-effect tube and second field-effect tube, described the
Second pole of one field-effect tube, the third field-effect tube control electrode be respectively connected with, the first pole of second field-effect tube
Extremely it is connected with the second of the third field-effect tube, the of the first pole of the third field-effect tube and the 4th field-effect tube
One pole is connected with the ground terminal respectively, the control electrode phase of the control electrode of the third field-effect tube and the 4th field-effect tube
Even, the second pole of the 4th field-effect tube is extremely connected with the first of the 5th field-effect tube, the 5th field-effect tube
Second pole is connected with the input terminal of the second switch module；The positive input of first operational amplifier and described second
The first of field-effect tube is extremely connected, the second pole of the negative input of first operational amplifier and the 4th field-effect tube
It is connected, the output end of first operational amplifier is connected with the control electrode for stating the 5th field-effect tube；
Wherein, first field-effect tube is p-type field-effect tube, second field-effect tube, third field-effect tube, the 4th effect
Should manage with the 5th field-effect tube is N-type field-effect tube；The channel width-over-length ratio of 4th field-effect tube and the channel of third field-effect tube
The ratio of breadth length ratio is M；
The second switch module includes the 6th field-effect tube, the control electrode and the control signal end of the 6th field-effect tube
It is connected, the second pole of the 6th field-effect tube is extremely connected with the second of the 5th field-effect tube；
Second amplification module include the 7th field-effect tube, the 8th field-effect tube, the 9th field-effect tube, the tenth field-effect tube and
Second operational amplifier；Wherein, the second pole of the control electrode of the 7th field-effect tube and the 7th field-effect tube, described the
First pole of six field-effect tube, the 8th field-effect tube control electrode be respectively connected with, the first pole of the 7th field-effect tube
Extremely it is connected with the second of the 8th field-effect tube, the of the first pole of the 8th field-effect tube and the 9th field-effect tube
One pole is connected with the second source signal end respectively, control electrode and the 9th field-effect tube of the 8th field-effect tube
Control electrode is connected, and the second pole of the 9th field-effect tube is extremely connected with the first of the tenth field-effect tube, and the described ten
Second pole of effect pipe is connected with the input terminal of the processing modulation unit；
The positive input of second operational amplifier is extremely connected with the first of the 7th field-effect tube, second operation amplifier
The negative input of device is extremely connected with the second of the 9th field-effect tube, the output end of the second operational amplifier with it is described
The control electrode of tenth field-effect tube is connected；
Wherein, the 6th field-effect tube, the 7th field-effect tube, the 8th field-effect tube, the 9th field-effect tube and the tenth field-effect
Pipe is p-type field-effect tube；The ratio of the channel width-over-length ratio of the channel width-over-length ratio and the 8th field-effect tube of 9th field-effect tube is N.
4. driving compensation circuit according to claim 1, which is characterized in that the processing modulation unit include integrator,
Analog-digital converter and logic card；Wherein, the positive input of the integrator is connected with reference voltage end, and the integrator is born
It is connected to input terminal with the first output end of the current amplification unit, the output end of the integrator and the analog-digital converter
Input terminal be connected, the output end of the analog-digital converter is connected with the input terminal of the logic card, the output of the logic card
End is connected with the data line.
5. driving compensation circuit according to claim 4, which is characterized in that the integrator includes switch, first capacitor
With third operational amplifier；Wherein, the first output end of the current amplification unit respectively with one end of the switch, described
First pole plate of one capacitor is connected with the negative input of the third operational amplifier, the forward direction of the third operational amplifier
Input terminal is connected with the reference voltage end, the other end of the switch, the second pole plate of the first capacitor, third fortune
The output end for calculating amplifier is connected with the input terminal of the analog-digital converter respectively.
6. driving compensation circuit according to claim 1, which is characterized in that the driving unit includes the first film crystal
Pipe, the second thin film transistor (TFT) and the second capacitor；Wherein, the control electrode of first film transistor is connected with the scanning signal end,
Second pole of the first film transistor is connected with the data line, the first pole of the first film transistor and described the
The control electrode of two thin film transistor (TFT)s, second capacitor the first pole plate be respectively connected with, the first of second thin film transistor (TFT)
Pole is connected with first power supply signal end, the second pole of the second pole of second thin film transistor (TFT) and second capacitor
Plate, the display unit, the current amplification unit first input end be respectively connected with.
7. a kind of driving compensation method, which is characterized in that be applied to driving as described in any one of claims 1 to 6 compensation electricity
Lu Zhong, the driving compensation method include:
Under the action of the scanning signal provided by the scanning signal end, the voltage signal that the data line provides is converted to
Current signal；
Under the action of controlling signal provided by the control signal end, converted current signal is acquired, by the electric current
Signal amplifies；
Amplified current signal is converted into drive voltage signal, the drive voltage signal is handled and modulated, it will
Modulated drive voltage signal is transmitted to the data line；
Under the action of the scanning signal provided by the scanning signal end, the modulated driving that the data line is provided is electric
Pressure signal is converted to driving current signal, and the driving current signal converted is exported to display unit.
8. driving compensation method according to claim 7, which is characterized in that when the electric current in the driving compensation circuit is put
Big unit includes first switch module, the first amplification module, second switch module and the second amplification module；
Under the action of the scanning signal provided by the scanning signal end, converted current signal is acquired, it will be described
Current signal, which amplifies, includes:
Under the action of the control signal, the first switch module acquires converted current signal, by electricity collected
Stream signal is transmitted to first amplification module, and first amplification module amplifies the current signal converted progress for M times；
Under the action of the control signal, the second switch module will be through M times of the first amplification module amplified electricity
Stream signal is transmitted to second amplification module, and M times of amplified current signal is carried out N times and put by second amplification module
Greatly；
Wherein, M is the positive integer greater than 1 less than 20, and N is the positive integer greater than 1 less than 20.
9. driving compensation method according to claim 7, which is characterized in that the processing tune in the driving compensation circuit
Unit processed includes integrator, analog-digital converter and logic card；
It is described that amplified current signal is converted into drive voltage signal, the drive voltage signal is handled and adjusted
System, modulated drive voltage signal, which is transmitted to the data line, includes:
Amplified current signal is converted to drive voltage signal by the integrator；
The drive voltage signal is converted to digital drive voltage signal by the analog-digital converter；
The logic card is modulated the digital drive voltage signal, and modulated digital drive voltage signal is transmitted to
The data line.
10. a kind of display device, which is characterized in that including driving compensation circuit as described in any one of claims 1 to 6.
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| CN107633815B (en) * | 2017-10-27 | 2020-02-28 | 京东方科技集团股份有限公司 | Compensation structure of driving circuit, driving circuit module and display panel |
| CN110473497B (en) | 2018-05-09 | 2021-01-22 | 京东方科技集团股份有限公司 | Pixel circuit, driving method thereof and display panel |
| CN108615491B (en) | 2018-05-16 | 2020-08-07 | 京东方科技集团股份有限公司 | Aging detection circuit, aging compensation module and display panel |
| CN108962146B (en) * | 2018-08-31 | 2020-11-27 | 京东方科技集团股份有限公司 | External compensation circuit, compensation method and display device |
| CN109961742B (en) | 2019-05-15 | 2020-12-29 | 云谷（固安）科技有限公司 | Display panel and display device |
| CN113299235B (en) * | 2021-05-20 | 2022-10-25 | 京东方科技集团股份有限公司 | Pixel circuit, driving method thereof and display device |
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