CN107146578A - One kind driving compensation circuit and driving compensation method, display device - Google Patents
One kind driving compensation circuit and driving compensation method, display device Download PDFInfo
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- CN107146578A CN107146578A CN201710538861.9A CN201710538861A CN107146578A CN 107146578 A CN107146578 A CN 107146578A CN 201710538861 A CN201710538861 A CN 201710538861A CN 107146578 A CN107146578 A CN 107146578A
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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 invention provides one kind driving compensation circuit and driving compensation method, display device, it is related to display technology field, the harmful effect brought in the prior art by way of gathering driving voltage and compensating can be overcome.Compensation circuit is driven to include driver element, current amplification unit and processing modulating unit；Driver element control end is connected with scanning signal end, first input end is connected with data wire, output end is connected with display unit and current amplification unit first input end, control end is connected with control signal end, first output end is connected with processing modulating unit input, and processing modulating unit output end is connected with data wire；The voltage signal that data wire is provided is converted to current signal, output to display unit by driver element；Current amplification unit collection amplification current signal；Current signal is converted to drive voltage signal by processing modulating unit, carries out processing modulation, the signal after modulation is transmitted to data wire.Above-mentioned driving compensation circuit is shown for carrying out image.
Description
Technical field
The present invention relates to display technology field, more particularly to a kind of driving compensation circuit and driving compensation method, display dress
Put.
Background technology
AMOLED (Active Matrix/Organic Light Emitting Diode, active-matrix organic light emission two
Polar body panel) display has the advantages that ultra-thin, high colour gamut, high-contrast, it is widely applied in display field.
When large-area manufacturing thin film transistor (TFT) during pixel-driving circuit to form displayer, on the one hand, by
The limitation of technique, the numerical value of the electrical parameter such as threshold voltage, the electron mobility of the thin film transistor (TFT) of diverse location can not be protected
Hold consistent, this will result in the current difference and luminance difference of Organic Light Emitting Diode, that is, mura phenomenons occur.In addition, in length
Under the pressurization and high temperature of time, different degrees of drift occurs in the threshold voltage of the thin film transistor (TFT) of diverse location, and this can make
Difference is shown into brightness, that is, ghost phenomena occurs.
To overcome above mentioned problem, generally drive circuit is compensated by the way of external compensation, showed with eliminating 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 by special
Integrated circuit is come the mode that compensates.In the prior art, generally compensated by the way of voltage-type external compensation, i.e.,
The driving voltage of Organic Light Emitting Diode is extracted by certain mode, and data signal is converted into by analog-digital converter
Handled, be finally sent to single-chip microcomputer and carry out data fine setting.Although voltage-type external compensation has, actuating speed is very fast, compensate effect
Fruit preferably advantage, but voltage-type external compensation mode still suffers from two drawbacks：On the one hand, the drive voltage signal extracted is very
Easily it is interfered, this inevitably causes certain influence to compensation；On the other hand, with displayer size
Increase and the raising of resolution ratio, the parasitic capacitance of display panel are also just increasing, and this results in the driving in the set time
The numerical value step-down of voltage, when the relatively low driving voltage of logarithm value carries out analog-to-digital conversion, will be proposed to precision of A/D converter
Requirements at the higher level.
The content of the invention
The invention provides one kind driving compensation circuit and driving compensation method, display device, prior art can be overcome
In the harmful effect that is brought by way of gathering driving voltage and compensating.
To reach above-mentioned purpose, the present invention is adopted the following technical scheme that：
The first aspect of the present invention provides a kind of driving compensation circuit, including driver element, current amplification unit and place
Manage modulating unit；Wherein, the control end of the driver element is connected with scanning signal end, the first input end of the driver element
It is connected with data wire, the second input of the driver element is connected with the first power supply signal end, the output of the driver element
The first input end respectively with display unit and the current amplification unit is held to be connected, the second input of the current amplification unit
End is connected with second source signal end, and the control end of the current amplification unit is connected with control signal end, the Current amplifier
First output end of unit with it is described processing modulating unit input be connected, the second output end of the current amplification unit and
The earth terminal is connected, and the output end of the processing modulating unit is connected with the data wire；
The driver element is used in the presence of the scanning signal that the scanning signal end is provided, by the data wire
The voltage signal of offer is converted to current signal, and the current signal changed is exported to the display unit；
The current amplification unit is used in the presence of the control signal that the control signal end is provided, and collection is described
Current signal, the current signal is amplified；
The processing modulating unit is used to the current signal after amplification being converted to drive voltage signal, to the driving electricity
Pressure signal is handled and modulated, and the drive voltage signal after modulation is transmitted to the data wire.
In driving compensation circuit provided by the present invention, including driver element, current amplification unit, processing modulating unit
With the part of display unit four.The first input end of driver element is connected with data wire, the output end of driver element 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 with handling the defeated of modulating unit
Enter end to be connected, the output end of processing modulating unit is connected with data wire.Based on this kind of annexation, driver element carries data wire
The voltage signal of confession is converted to after current signal, and current amplification unit can be acquired and amplify to the current signal changed,
Then, the current signal after amplification is converted to drive voltage signal by processing modulating unit, and drive voltage signal is adjusted
System, after the completion of modulation, the drive voltage signal after modulation is transmitted to data wire, so as to realize compensation.When processing modulating unit
Drive voltage signal after modulation is transmitted to data wire, driver element can receive the driving electricity after modulation from data wire
Signal is pressed, the drive voltage signal after modulation driving current signal is converted into, and the current signal changed is exported to aobvious
Show unit, so as to avoid display device from mura phenomenons and afterimage phenomena occur.Due to driving compensation circuit provided by the present invention
The signal gathered is current signal, therefore can be avoided in the prior art by way of gathering drive voltage signal and compensating
The harmful effect brought.On the other hand, due to being provided with current amplification unit in driving compensation circuit, thus can be to current signal
It is amplified, that is, increases the numerical value of current signal, so, current signal is handled by handling modulating unit
During modulation, so that it may reduce the requirement to handling modulating unit precision, so as to improve the applicability of the driving compensation circuit, and have
Develop beneficial 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：
In the presence of the scanning signal that the scanning signal end is provided, the voltage signal that the data wire is provided turns
It is changed to current signal；
In the presence of the control signal that the control signal end is provided, changed current signal is gathered, will be described
Current signal is amplified；
Current signal after amplification is converted into drive voltage signal, the drive voltage signal is handled and adjusted
System, the drive voltage signal after modulation is transmitted to the data wire；
In the presence of the scanning signal that the scanning signal end is provided, the drive after the modulation that the data wire is provided
Dynamic voltage signal is converted to driving current signal, and the driving current signal changed is exported to display unit.
The beneficial effect of driving compensation method provided by the present invention is mended with the driving that the first aspect of the present invention is provided
The beneficial effect for repaying circuit is identical, and here is omitted.
The third aspect of the present invention provides a kind of display device, including the driving benefit as described in the first aspect of the present invention
Repay circuit.
The driving compensation electricity that the beneficial effect of display device provided by the present invention is provided with the first aspect of the present invention
The beneficial effect on road is identical, and here is omitted.
Brief description of the drawings
In order to illustrate more clearly about the embodiment of the present invention or technical scheme of the prior art, below will be to embodiment or existing
There is the accompanying drawing used required in technology description to be briefly described, it should be apparent that, drawings in the following description are only this
Some embodiments of invention, for those of ordinary skill in the art, on the premise of not paying creative work, can be with
Other accompanying drawings are obtained according to these accompanying drawings.
The structural representation one for the driving compensation circuit that Fig. 1 is provided by the embodiment of the present invention one；
The structural representation two for the driving compensation circuit that Fig. 2 is provided by the embodiment of the present invention one；
The structural representation three for the driving compensation circuit that Fig. 3 is provided by the embodiment of the present invention one；
The schematic diagram one for the driving compensation method that Fig. 4 is provided by the embodiment of the present invention two；
The schematic diagram two for the driving compensation method that Fig. 5 is provided by the embodiment of the present invention two；
The schematic diagram three for the driving compensation method that Fig. 6 is provided by the embodiment of the present invention two.
Description of reference numerals：
1- driver elements；2- current amplification units；
21- first switch modules；The amplification modules of 22- first；
23- second switch modules；The amplification modules of 24- second；
31- integrators；32- analog-digital converters；
33- logic cards；4- display units；
DATA- data wires；The first power supply signals of OVDD- end；
OLED- Organic Light Emitting Diodes；GND- earth terminals；
AVDD- second source signal ends；SW- control signal ends；
Vref- reference voltage ends；The FETs of M1- first；
The FETs of M2- second；The FETs of M3- the 3rd；
The FETs of M4- the 4th；The FETs of M5- the 5th；
The FETs of M6- the 6th；The FETs of M7- the 7th；
The FETs of M8- the 8th；The FETs of M9- the 9th；
The FETs of M10- the tenth；T1- first film transistors；
The thin film transistor (TFT)s of T2- second；The electric capacity of C1- first；
The electric capacity of C2- second；K- is switched；
The operational amplifiers of OP1- first；The operational amplifiers of OP2- second；
The operational amplifiers of OP3- the 3rd；SCAN- scanning signals end.
Embodiment
In order to facilitate the understanding of the purposes, features and advantages of the present invention, below in conjunction with present invention implementation
Accompanying drawing in example, the technical scheme in the embodiment of the present invention is clearly and completely described.Obviously, described embodiment
Only a part of embodiment of the invention, rather than whole embodiments.Based on the embodiment in the present invention, the common skill in this area
All other embodiment that art personnel are obtained on the premise of creative work is not made, belongs to the model that the present invention is protected
Enclose.
Embodiment one
As shown in figure 1, a kind of driving compensation circuit is present embodiments provided, for driving display unit 4.The driving is compensated
Circuit specifically includes driver element 1, current amplification unit 2, processing modulating unit 3.
Wherein, the control end of driver element 1 is connected with scanning signal end SCAN, the first input end and number of driver element 1
It is connected according to line DATA, the second input of driver element 1 is connected with the first power supply signal end OVDD, the output end of driver element 1
The first input end with display unit 4 and current amplification unit 2 is connected respectively, the second input of current amplification unit 2 and
Two power supply signal end AVDD are connected, and the control end of current amplification unit 2 is connected with control signal end SW, current amplification unit 2
First output end is connected with handling the input of modulating unit 3, the second output end and the earth terminal GND phases of current amplification unit 2
Even, the output end of processing modulating unit 3 is connected with data wire DATA.
Specifically, driver element 1 is used in the presence of the scanning signal that scanning signal end SCAN is provided, by data wire
The voltage signal that DATA is provided is converted to current signal, and the current signal changed is exported to the display unit 4.Electric current is put
Big unit 2 is used in the presence of the control signal that control signal end SW is provided, and gathers current signal, current signal is carried out
Amplification.Processing modulating unit 3 is used to the current signal after amplification being converted to drive voltage signal, and drive voltage signal is carried out
Processing and modulation, the drive voltage signal after modulation is transmitted to data wire DATA.
In the driving compensation circuit that the present embodiment is provided, including driver element 1, current amplification unit 2, processing modulation
Unit 3.The first input end of driver element 1 is connected with data wire DATA, the output end of driver element 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 with handling the defeated of modulating unit 3
Enter end to be connected, the output end of processing modulating unit 3 is connected with data wire DATA.Based on this kind of annexation, driver element 1 is by number
Be converted to according to the line DATA voltage signals provided after current signal, current amplification unit 2 can be carried out to the current signal changed
Gather and amplify, then, the current signal after amplification is converted to drive voltage signal by processing modulating unit 3, and to driving electricity
Pressure signal is modulated, and after the completion of modulation, the drive voltage signal after modulation is transmitted to data wire DATA, so as to realize benefit
Repay.Drive voltage signal after modulating unit 3 is handled by modulation is transmitted to data wire DATA, and driver element 1 can be from data
The drive voltage signal after modulation is received in line DATA, the drive voltage signal after modulation is converted into driving current signal,
And export the current signal changed to display unit 4, so as to avoid display device from mura phenomenons and afterimage phenomena occur.By
The signal that the driving compensation circuit provided in the present embodiment is gathered is current signal, therefore can avoid passing through in the prior art
The harmful effect that the mode that collection drive voltage signal is compensated is brought.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
When crossing processing modulating unit 3 to current signal progress processing modulation, so that it may reduce the requirement to handling the precision of modulating unit 3, from
And the applicability of the driving compensation circuit is improved, and be conducive to display device to develop in large size and high-resolution.
Current amplification unit 2 specifically includes first switch module 21, the first amplification module 22, second and closes module 23 and second
Amplification module 24.
Wherein, the control end of first switch module 21 is connected with control signal end SW, the input of first switch module 21
It is connected with the output end of driver element 1, the output end of first switch module 21 is connected with the input of the first amplification module 22, the
First output end of one amplification module 22 is connected with earth terminal GND.First switch module 21 is used in the presence of control signal,
The current signal transfer that driver element 1 is changed is to the first amplification module 22；First amplification module 22 is used to be changed
Current signal carries out M times and amplified.
The control end of second pass module 23 is connected with control signal end SW, and second closes the input of module 23 and the first amplification
Second output end 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 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 for managing modulating unit 3 is connected.Second, which closes module 23, is used in the presence of control signal, will be through the first amplification module
22M times amplify after current signal transfer to the second amplification module 24；Second amplification module 24 is used for the electric current after M times is amplified
Signal carries out N times and amplified, the current signal transfer after M × N times is amplified to processing modulating unit 3.Wherein, M is to be less than more than 1
20 positive integer, N is the positive integer more than 1 less than 20.
When current amplification unit 2 specifically includes the first amplification module 22 and the second amplification module 24, and it is each with it respectively
When self-corresponding first switch module 21 and second closes module 23, the current signal amplification M × N that driver element 1 can be changed
Times, so, when carrying out processing modulation to current signal by handling modulating unit 3, so that it may which reduction is to the essence of processing modulating unit 3
The requirement of degree, so as to improve the applicability of the driving compensation circuit.
In addition, compared with being amplified using single amplification module to current signal, level is carried out using two amplification modules
Connection amplification, it is possible to decrease the requirement to the multiplication factor of single amplification module, is so also easy in the manufacture craft of amplification module
Realize.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 FET M1, the first FET M1 control
Pole processed is connected with control signal end SW, and the first FET M1 the first pole is connected with the output end of driver element 1.
First amplification module 22 include the second FET M2, the 3rd FET M3, the 4th FET M4, the 5th
Effect pipe M5 and the first operational amplifier OP1.Wherein, the second FET M2 control pole and the second of the second FET M2
Pole, the first FET M1 the second pole, the 3rd FET M3 control pole are respectively connected with, and the first of the second FET M2
Pole is extremely connected with the second of the 3rd FET M3, the 3rd FET M3 the first pole and the first of the 4th FET M4
Pole, earth terminal GND are respectively connected with, and the 3rd FET M3 control pole is connected with the 4th FET M4 control pole, and the 4th
FET M4 the second pole is extremely connected with the first of the 5th FET M5, and the 5th FET M5 the second pole is closed with second
The input of module 23 is connected.First operational amplifier OP1 positive input is extremely connected with the first of the second FET M2,
First operational amplifier OP1 negative input is extremely connected with the second of the 4th FET M4, the first operational amplifier OP1's
Output end is connected with the 5th FET M5 control pole.
Wherein, the first FET M1 be p-type FET, the second FET M2, the 3rd FET M3, the 4th
Effect pipe M4 and the 5th FET M5 is N-type FET.4th FET M4 channel width-over-length ratio and the 3rd field-effect
The ratio of pipe M3 channel width-over-length ratio is M.
Second, which closes module 23, includes the 6th FET M6, the 6th FET M6 control pole and control signal end SW phases
Even, the 6th FET M6 the second pole is extremely connected with the second of the 5th FET M5.
Second amplification module 24 include the 7th FET M7, the 8th FET M8, the 9th FET M9, the tenth
Effect pipe M10 and the second operational amplifier OP2.Wherein, the of the 7th FET M7 control pole and the 7th FET M7
Two poles, the 6th FET M6 the first pole, the 8th FET M8 control pole are respectively connected with, and the of the 7th FET M7
One pole is extremely connected with the second of the 8th FET M8, the 8th FET M8 the first pole and the first of the 9th FET M9
Pole, second source signal end AVDD are respectively connected with, the 8th FET M8 control pole and the 9th FET M9 control pole
It is connected, the 9th FET M9 the second pole is extremely connected with the first of the tenth FET M10, the of the tenth FET M10
Two poles are connected with handling the input of modulating unit 3.
Second operational amplifier OP2 positive input is extremely connected with the first of the 7th FET M7, and the second computing is put
Big device OP2 negative input is extremely connected with the second of the 9th FET M9, the second operational amplifier OP2 output end and the
Ten FET M10 control pole is connected.
Wherein, the 6th FET M6, the 7th FET M7, the 8th FET M8, the 9th FET M9 and
Ten FET M10 are p-type FET.9th FET M9 channel width-over-length ratio and the 8th FET M8 raceway groove is wide
The ratio of long ratio is N.
It is preferred that, the FET M10 of the first FET M1~the tenth is Metal-oxide-semicondutor (metal-
Oxid-semiconductor, abbreviation MOS) field-effect transistor.
The operation principle of current amplification unit 2 is specifically described with reference to Fig. 3：
After voltage signal is converted to current signal by driver element 1, control signal end SW to the first FET M1 and
6th FET M6 grid provides control signal, now, and the first FET M1 and the 6th FET M6 believe in control
Turned in the presence of number.
Second FET M2, the 3rd FET M3, the 4th FET M4 and the 5th FET M5 are constituted altogether
Source source common-gate current mirror.General principle based on common-source common-gate current mirror structure is understood, if the electric current that will be changed through driver element 1
Signal is considered as reference current signal, in theory 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 FET M4 and the 3rd FET M3 channel width-over-length ratio
Ratio, as M.And the output impedance of the common-source common-gate current mirror is ro4 × gm5 × ro5, wherein, ro4 is the 4th FET
M4 internal resistance, gm5 is the 5th FET M5 mutual conductance, and ro5 is the 5th FET M5 internal resistance.
It should be noted that according to saturation current formulaUnderstand, FET it is full
It is relevant 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 FET, Vgs-
VthFor overdrive voltage, (1+ γ Vds) is the minorant of saturation current formula.
Under normal circumstances, for multiple FETs 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 limited precision of common-source common-gate current mirror, that is, only relies on second
The cascode current that FET M2, the 3rd FET M3, the 4th FET M4 and the 5th FET M5 are constituted
Mirror, the multiplication factor to current signal is difficult to reach M times.At this moment, put due to including the first computing in the first amplification module 22
Big device OP1, the equal characteristic of the numerical value of its positive input and the signal of negative input input is forced based on operational amplifier,
It can ensure that the 4th FET M4 and the 3rd FET M3 drain voltage are equal, that is, ensure the 4th FET M4
With the 3rd FET M3 source-drain voltage VdsIt is equal.It can be seen from saturation current formula, as the 4th FET M4 and the 3rd
FET M3 source-drain voltage VdsWhen equal, the 4th FET M4 and the 3rd FET M3 saturation current are only each with it
From channel width-over-length ratio be directly proportional, be no longer influenced by source-drain voltage VdsInfluence, and then make the first amplification module 22 realize to electric current
Signal is accurately amplified to M times.
Further, since the first amplification module 22 includes the first operational amplifier OP1, 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 now is A × ro4 × gm5 × ro5, wherein, A is the first fortune
Calculate amplifier OP1 gain.Corresponding, now the mismatch of electric current is reduced to 1/ (A × gm5 × ro5) times.
And because the 6th FET M6 is now also at conducting state, therefore, through the first accurately amplification of amplification module 22
M times of current signal flows out from the 5th FET M5, is transmitted to the 7th FET M7 by the 6th FET M6.
7th FET M7, the 8th FET M8, the 9th FET M9 and the tenth FET M10 are constituted altogether
Source source common-gate current mirror, M times of current signal is accurately exaggerated through the first amplification module 22, by common-source common-gate current mirror and with
After the processing of the second connected operational amplifier OP2 of common-source common-gate current mirror, N times, at this moment, current signal are accurately amplified to again
M × N times is exaggerated altogether through the first amplification module 22 and the second amplification module 24.
Finally, the current signal after amplifying through M × N times is transmitted into processing modulating unit 3 by the tenth FET M10,
Processing is completed by the current signal after the 3 pairs of amplifications of processing modulating unit and is modulated.
Referring again to Fig. 3, processing modulating unit 3 specifically includes 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, negative input and the 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 of analog-digital converter 32, analog-digital converter 32
Output end is connected with the input of logic card 33, and the output end of logic card 33 is connected with data wire DATA.Wherein, integrator 31 is used
Current signal after by amplification 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 the digital drive voltage signal after modulation
Transmit to data wire DATA.
Specifically, integrator 31 includes switch K, the first electric capacity C1 and the 3rd operational amplifier OP3.Wherein, Current amplifier
First output end of unit 2 is respectively with switching K one end, the first electric capacity C1 the first pole plate and the 3rd operational amplifier OP3
Negative input is connected, and the 3rd operational amplifier OP3 positive input is connected with reference voltage end Vref, and switch K's is another
End, the first electric capacity C1 the second pole plate, the 3rd operational amplifier OP3 output end input phase respectively with 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 begun to decline from the reference voltage end Vref reference voltages provided, it is defeated according to different current signals
Go out the drive voltage signal of different numerical value.
It should be noted that because current amplification unit 2 is exaggerated to current signal, therefore, the electric current after amplification
When signal is handled by integrator 31 again, the on the one hand requirement to the precision of integrator 31 is also just accordingly reduced, the opposing party
Face can also reduce the size of the first electric capacity C1 included in integrator 31 capacitance, so as to accelerate C1 pairs of the first electric capacity
The charge/discharge rates of current signal, shorten discharge and recharge time of the integrator 31 to current signal, and then shorten the compensation time.
Specifically, referring again to Fig. 3, display unit 4 includes Organic Light Emitting Diode OLED, and driver element 1 includes the
One thin film transistor (TFT) T1, the second thin film transistor (TFT) T2 and the second electric capacity C2.Wherein, first film transistor T1 control pole is with sweeping
Retouch signal end SCAN to be connected, first film transistor T1 the second pole is connected with data wire DATA, first film transistor T1's
First pole is respectively connected with the second thin film transistor (TFT) T2 control pole, the second electric capacity C2 the first pole plate, the second thin film transistor (TFT)
T2 the first pole is connected with the first power supply signal end OVDD, the second thin film transistor (TFT) T2 the second pole and the second of the second electric capacity C2
Pole plate, Organic Light Emitting Diode OLED positive pole, the first input end of current amplification unit 2 are respectively connected with.Wherein, the first film
Transistor T1 is used under the control of scanning signal, drive voltage signal after the modulation that data wire DATA is provided write-in the
Two thin film transistor (TFT) T2, the second thin film transistor (TFT) T2 are for being converted to driving current signal by drive voltage signal and being transmitted
To Organic Light Emitting Diode OLED positive pole, so as to drive Organic Light Emitting Diode OLED to light.
Embodiment two
A kind of driving compensation method is present embodiments provided, the driving compensation method is applied to the drive as described in embodiment one
In dynamic compensation circuit.
As shown in figure 4, the driving compensation method that the present embodiment is provided is specifically included：
Step S1：In the presence of the scanning signal that scanning signal end is provided, the voltage signal that data wire is provided turns
It is changed to current signal.
Step S2：In the presence of the control signal that control signal end is provided, changed current signal is gathered, and will
Current signal is amplified.
Step S3：Current signal after amplification is converted into drive voltage signal, to drive voltage signal carry out processing and
Modulation, the drive voltage signal after modulation is transmitted to data wire.
Step S4：In the presence of the scanning signal that scanning signal end is provided, the drive after the modulation that data wire is provided
Dynamic voltage signal is converted to driving current signal, and the driving current signal changed is exported to display unit.
In the driving compensation method that the present embodiment is provided, the voltage signal that data wire is provided is converted into current signal
Afterwards, the current signal changed can be acquired and is amplified, then, the current signal after amplification is converted into driving voltage letter
Number, and drive voltage signal is modulated, after the completion of modulation, the drive voltage signal after modulation is transmitted to data wire, from
And realize compensation.Drive voltage signal after modulation is transmitted to data wire, the driving electricity after the modulation that data wire is provided
Pressure signal is converted to driving current signal, and the driving current signal changed is exported to display unit, so as to avoid display
There is mura phenomenons and afterimage phenomena in device.By in the driving compensation method that the present embodiment is provided, the signal gathered
For current signal, thus can avoid being brought by way of gathering drive voltage signal and compensating in the prior art it is bad
Influence.On the other hand, because the driving compensation method can be also amplified to 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 and adjusted to the processing for handling modulated current signal
The requirement of unit precision processed, so as 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：In the presence of control signal, first switch module gathers changed current signal, will be gathered
Current signal transfer to the first amplification module, the first amplification module amplifies the current signal changed progress for M times.
Step S22：In the presence of control signal, second switch module is by the electricity after amplifying through M times of the first amplification module
Stream signal is transmitted to the second amplification module, and N times of current signal progress after the second amplification module amplifies M times is amplified.Wherein, M
To be less than 20 positive integer more than 1, N is the positive integer more than 1 less than 20.
The current signal that driver element is changed amplifies M × N times, so, and electric current is believed by handling modulating unit
When number carrying out processing modulation, so that it may reduce to handling the requirement of modulating unit precision, so as to improve the suitable of the driving compensation circuit
The property used.
In addition, carrying out Cascaded amplification to current signal, it is possible to decrease the requirement to the multiplication factor of single amplification module, so
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 modulating unit in compensation circuit to include integrator, analog-digital converter and logic card, such as Fig. 6 institutes
Show.Step S3 is specifically included：
Step S31：Current signal after amplification 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 to digital drive voltage signal, and the digital drive voltage signal after modulation is passed
Transport to data wire.
Embodiment three
A kind of display device is present embodiments provided, the display device includes the driving compensation circuit as described in embodiment one
And display unit.
In the display device that the present embodiment is provided, the signal exported to display unit can be compensated, so as to disappear
Except mura phenomenons and afterimage phenomena, the display unit for example can be Organic Light Emitting Diode.Also, during due to compensating
The signal gathered is current signal, therefore can also be avoided in the prior art by gathering the side that drive voltage signal is compensated
The harmful effect that formula is brought, is conducive to the development of in large size and high-resolution.
The embodiment of the present invention is the foregoing is only, but protection scope of the present invention is not limited thereto, it is any
Those familiar with the art the invention discloses technical scope in, the change or replacement that can be readily occurred in, all should
It is included within the scope of the present invention.Therefore, protection scope of the present invention should using the scope of the claims as
It is accurate.
Claims (10)
1. one kind driving compensation circuit, for driving display unit, it is characterised in that including driver element, current amplification unit
With processing modulating unit；Wherein, the control end of the driver element is connected with scanning signal end, and the first of the driver element is defeated
Enter end with data wire to be connected, the second input of the driver element is connected with the first power supply signal end, the driver element
First input end of the output end respectively with the display unit and the current amplification unit is connected, the current amplification unit
Second input is connected with second source signal end, and the control end of the current amplification unit is connected with control signal end, described
First output end of current amplification unit is connected with the input of the processing modulating unit, and the second of the current amplification unit
Output end is connected with earth terminal, and the output end of the processing modulating unit is connected with the data wire；
The driver element is used in the presence of the scanning signal that the scanning signal end is provided, and the data wire is provided
Voltage signal be converted to current signal, the current signal changed is exported to the display unit；
The current amplification unit is used in the presence of the control signal that the control signal end is provided, and gathers the electric current
Signal, the current signal is amplified；
The processing modulating unit is used to the current signal after amplification being converted to drive voltage signal, and the driving voltage is believed
Number handled and modulated, the drive voltage signal after modulation is transmitted to the data wire.
2. driving compensation circuit according to claim 1, it is characterised 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 end 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 driver element, the output end of the first switch module and the input of first amplification module
End is connected, and the first output end of first amplification module is connected with the earth terminal；The first switch module is used in institute
In the presence of stating control signal, the current signal transfer that the driver element is changed to first amplification module；Described
M times of the current signal progress that one amplification module is used to be changed is amplified；
The control end of the second switch module is connected with the control signal end, the input of the second switch module and institute
The second output end 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 is connected, and the second input 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 of the processing modulating unit；The second switch module is used in the control letter
In the presence of number, by the current signal transfer after amplifying through M times of first amplification module to second amplification module；It is described
N times of the current signal progress that second amplification module is used for after M times is amplified is amplified, the current signal transfer after M × N times is amplified
To the processing modulating unit；Wherein, M is is less than 20 positive integer more than 1, and N is the positive integer more than 1 less than 20.
3. driving compensation circuit according to claim 2, it is characterised in that
The first switch module includes the first FET, control pole and the control signal end of first FET
It is connected, the first pole of first FET is connected with the output end of the driver element；
First amplification module include the second FET, the 3rd FET, the 4th FET, the 5th FET and
First operational amplifier；Wherein, the second pole of the control pole of second FET and second FET, described the
Second pole of one FET, the control pole of the 3rd FET are respectively connected with, the first pole of second FET
Extremely it is connected with the second of the 3rd FET, the of the first pole of the 3rd FET and the 4th FET
One pole, the earth terminal are respectively connected with, the control pole and the control pole phase of the 4th FET of the 3rd FET
Even, the second pole of the 4th FET is extremely connected with the first of the 5th FET, the 5th FET
Second pole is connected with the input of the second switch module；The positive input of first operational amplifier and described second
The first of FET is extremely connected, the second pole of the negative input of first operational amplifier and the 4th FET
It is connected, the output end of first operational amplifier is connected with stating the control pole of the 5th FET；
Wherein, first FET is p-type FET, second FET, the 3rd FET, the 4th effect
It is N-type FET that should manage with the 5th FET；The channel width-over-length ratio of 4th FET and the raceway groove of the 3rd FET
The ratio of breadth length ratio is M；
The second switch module includes the 6th FET, control pole and the control signal end of the 6th FET
It is connected, the second pole of the 6th FET is extremely connected with the second of the 5th FET；
Second amplification module include the 7th FET, the 8th FET, the 9th FET, the tenth FET and
Second operational amplifier；Wherein, the second pole of the control pole of the 7th FET and the 7th FET, described the
First pole of six FETs, the control pole of the 8th FET are respectively connected with, the first pole of the 7th FET
Extremely it is connected with the second of the 8th FET, the of the first pole of the 8th FET and the 9th FET
One pole, the second source signal end are respectively connected with, control pole and the 9th FET of the 8th FET
Control pole is connected, and the second pole of the 9th FET is extremely connected with the first of the tenth FET, the described ten
Second pole of effect pipe is connected with the input of the processing modulating unit；
The positive input of second operational amplifier is extremely connected with the first of the 7th FET, second operation amplifier
The negative input of device is extremely connected with the second of the 9th FET, the output end of second operational amplifier with it is described
The control pole of tenth FET is connected；
Wherein, the 6th FET, the 7th FET, the 8th FET, the 9th FET and the tenth field-effect
Manage as p-type FET；The ratio of the channel width-over-length ratio of 9th FET and the channel width-over-length ratio of the 8th FET is N.
4. driving compensation circuit according to claim 1, it is characterised in that the processing modulating unit include integrator,
Analog-digital converter and logic card；Wherein, the positive input of the integrator is connected with reference voltage end, the integrator it is negative
It is connected to input with the first output end of the current amplification unit, the output end of the integrator and the analog-digital converter
Input be connected, the output end of the analog-digital converter is connected with the input of the logic card, the output of the logic card
End is connected with the data wire.
5. driving compensation circuit according to claim 4, it is characterised in that the integrator includes switch, the first electric capacity
With the 3rd operational amplifier；Wherein, the first output end of current amplification unit one end respectively with the switch, described
First pole plate of one electric capacity is connected with the negative input of the 3rd operational amplifier, the forward direction of the 3rd operational amplifier
Input is connected with the reference voltage end, the other end of the switch, the second pole plate of first electric capacity, the 3rd fortune
Input of the output end of amplifier respectively with the analog-digital converter is calculated to be connected.
6. driving compensation circuit according to claim 1, it is characterised in that the driver element includes the first film crystal
Pipe, the second thin film transistor (TFT) and the second electric capacity；Wherein, the control pole of first film transistor is connected with the scanning signal end,
Second pole of the first film transistor is connected with the data wire, the first pole of the first film transistor and described the
The control pole of two thin film transistor (TFT)s, the first pole plate of second electric capacity are respectively connected with, and the first of second thin film transistor (TFT)
Pole is connected with the first power supply signal end, the second pole of second thin film transistor (TFT) and the second pole of second electric capacity
Plate, the display unit, the first input end of the current amplification unit are respectively connected with.
7. one kind driving compensation method, it is characterised in that compensate electricity applied to the driving as described in any one of claim 1~6
Lu Zhong, the driving compensation method includes：
In the presence of the scanning signal that the scanning signal end is provided, the voltage signal that the data wire is provided is converted to
Current signal；
In the presence of the control signal that the control signal end is provided, changed current signal is gathered, by the electric current
Signal is amplified；
Current signal after amplification is converted into drive voltage signal, the drive voltage signal is handled and modulated, will
Drive voltage signal after modulation is transmitted to the data wire；
In the presence of the scanning signal that the scanning signal end is provided, the driving electricity after the modulation that the data wire is provided
Pressure signal is converted to driving current signal, and the driving current signal changed is exported to display unit.
8. driving compensation method according to claim 7, it is characterised 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；
It is described to gather changed current signal in the presence of the scanning signal that the scanning signal end is provided, will be described
Current signal be amplified including：
In the presence of the control signal, the first switch module gathers changed current signal, by the electricity gathered
Stream signal is transmitted to first amplification module, and first amplification module amplifies the current signal changed progress for M times；
In the presence of the control signal, the second switch module is by the electricity after amplifying through M times of first amplification module
Stream signal is transmitted to second amplification module, and N times of current signal progress after second amplification module amplifies M times is put
Greatly；
Wherein, M is is less than 20 positive integer more than 1, and N is the positive integer more than 1 less than 20.
9. driving compensation method according to claim 7, it is characterised in that when the processing in the driving compensation circuit is adjusted
Unit processed includes integrator, analog-digital converter and logic card；
The current signal by after amplification is converted to drive voltage signal, and the drive voltage signal is handled and adjusted
System, the drive voltage signal after modulation, which is transmitted to the data wire, to be included：
Current signal after amplification 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 to the digital drive voltage signal, by the digital drive voltage signal after modulation transmit to
The data wire.
10. a kind of display device, it is characterised in that including the driving compensation circuit as described in any one of claim 1~6.
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