CN107452354A - A kind of GTG control circuit, display driver circuit and display device - Google Patents
A kind of GTG control circuit, display driver circuit and display device Download PDFInfo
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- CN107452354A CN107452354A CN201710872734.2A CN201710872734A CN107452354A CN 107452354 A CN107452354 A CN 107452354A CN 201710872734 A CN201710872734 A CN 201710872734A CN 107452354 A CN107452354 A CN 107452354A
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- voltage
- source electrode
- electrode driver
- gray scale
- gtg
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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
- G09G3/34—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 by control of light from an independent source
- G09G3/36—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 by control of light from an independent source using liquid crystals
- G09G3/3607—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 by control of light from an independent source using liquid crystals for displaying colours or for displaying grey scales with a specific pixel layout, e.g. using sub-pixels
-
- 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
- G09G3/34—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 by control of light from an independent source
- G09G3/36—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 by control of light from an independent source using liquid crystals
- G09G3/3611—Control of matrices with row and column drivers
- G09G3/3685—Details of drivers for data electrodes
- G09G3/3688—Details of drivers for data electrodes suitable for active matrices only
Abstract
The embodiment of the present invention provides a kind of GTG control circuit, display driver circuit and display device, is related to display technology field, for reducing the deviation between the data voltage on data wire and setting value.The GTG control circuit includes reference voltage generator and gray scale compensation device；Gray scale compensation device connects reference voltage generator and source electrode driver；The voltage difference that gray scale compensation device is used between the data voltage for a benchmark gray scale voltage and source electrode driver feedback for obtaining reference voltage generator output, and the voltage difference is compensated in input into the benchmark gray scale voltage of source electrode driver.The GTG control circuit is used to provide benchmark gray scale voltage to source electrode driver.
Description
Technical field
The present invention relates to display technology field, more particularly to a kind of GTG control circuit, display driver circuit and display dress
Put.
Background technology
(Thin Film Transistor Liquid Crystal Display, TFT-LCD show TFT-LCD
Show device) a kind of panel display apparatus is used as, because it has small volume, low in energy consumption, radiationless and cost of manufacture relatively low
Feature, and be applied to more and more among high-performance display field.
Above-mentioned TFT-LCD includes the grid line and data wire that transverse and longitudinal is intersected.During display, grid line is swept line by line
Retouch, to be gated line by line to the sub-pix in the TFT-LCD；Then, distinguished by data wire to a line sub-pix of gating
Input data voltage, so as to be charged to the sub-pix.Liquid crystal molecule now corresponding with the sub-pixel location occurs inclined
Turn so that the grey decision-making that the sub-pix is shown matches with the grey decision-making exported to the sub-pix.
It is provided with usual TFT-LCD for the Source IC (source drives of above-mentioned data wire output data voltage
Device).Due to TFT-LCD display panel (Panel) upward wiring itself line resistance, RC Delay (resistance capacitance delay) effects with
And the influence of noise (Noise) interference signal so that there is relatively large deviation between the data voltage and setting value on data wire, from
And reduce display effect.
The content of the invention
Embodiments of the invention provide a kind of GTG control circuit, display driver circuit and display device, for reducing number
According to the deviation between the data voltage on line and setting value.
To reach above-mentioned purpose, embodiments of the invention adopt the following technical scheme that：
The one side of the embodiment of the present invention, there is provided a kind of GTG control circuit, the GTG control circuit include benchmark electricity
Press maker and gray scale compensation device；The gray scale compensation device connects the reference voltage generator and source electrode driver；It is described
The benchmark gray scale voltage that gray scale compensation device is used to obtain the reference voltage generator output feeds back with the source electrode driver
Data voltage between voltage difference, and by the voltage difference compensate in input to the source electrode driver benchmark gray scale voltage
In.
Optionally, GTG control circuit also includes data selector, the first compensating module and the second compensating module；It is described
Data selector connection polarity inversion control signal end, the source electrode driver and the gray scale compensation device；The data choosing
Select device be used under the control of the polarity inversion control signal end, by the source electrode driver output end feedback positive polarity or
Negative polarity data voltage is exported to the gray scale compensation device；First compensating module is connecting the reference voltage generator just
Polar voltages output end and the source electrode driver；First compensating module is used to obtain the positive polarity voltage output end
Voltage difference between voltage and the positive polarity data voltage of source electrode driver feedback, and the voltage difference is compensated in input extremely
In the benchmark GTG positive polarity voltage of the source electrode driver；Second compensating module connects the reference voltage generator
Reverse voltage output end and the source electrode driver；Second compensating module is used to obtain the reverse voltage output end
Voltage and source electrode driver feedback negative polarity data voltage between voltage difference, and the voltage difference is compensated in input
Into the benchmark GTG reverse voltage of the source electrode driver.
Optionally, first compensating module includes the first subtracter and first adder；First subtracter it is anti-
The data selector is connected to input, input in the same direction connects the positive polarity voltage output of the reference voltage generator
End, the output end of first subtracter connect the input in the same direction of the first adder；The first adder it is in the same direction
Input is also connected with the positive polarity voltage output end of the reference voltage generator.
Optionally, first compensating module also includes the first operational amplifier；First operational amplifier it is in the same direction
Input connects the output end of the first adder, the output end of first operational amplifier and the source electrode driver phase
Connection.
Optionally, second compensating module includes the second subtracter and second adder；Second subtracter it is anti-
The data selector is connected to input, input in the same direction connects the reverse voltage output of the reference voltage generator
End, the output end of second subtracter connect the input in the same direction of the second adder；The second adder it is in the same direction
Input is also connected with the reverse voltage output end of the reference voltage generator.
Optionally, second compensating module also includes the second operational amplifier；Second operational amplifier it is in the same direction
Input connects the output end of the second adder, the output end of second operational amplifier and the source electrode driver phase
Connection.
Further alternative, the data selector is also connected with the first supply voltage end and the second supply voltage end；It is described
Data selector includes：The first transistor, second transistor, third transistor and the 4th transistor；The first transistor
Grid connect the polarity inversion control signal end, the first pole connects the source electrode driver, and the second pole is mended with described first
Module is repaid to be connected；First pole of the second transistor connects the source electrode driver, the second pole and the described second compensation mould
Block is connected；The grid of third transistor connects the polarity inversion control signal end, the first pole connection the first power supply electricity
Pressure side, the second pole are connected with the grid of the second transistor；The grid of 4th transistor connects the polarity inversion
Control signal end, the first pole connect the grid of the second transistor, and the second pole is connected with the second supply voltage end.
The another aspect of the embodiment of the present invention, there is provided a kind of display driver circuit, including any one GTG described above
Control circuit, the display driver circuit also include source electrode driver；Gray scale compensation device and described in the GTG control circuit
Reference voltage generator is connected with the source electrode driver.
Optionally, the source electrode driver includes time schedule controller and multiple driving passages, each to drive passage to be used for
Drive a data line；The driving passage includes D/A converter module and operational amplifying module；The D/A converter module with
The gray scale compensation device, the reference voltage generator, the time schedule controller and the operational amplifying module are connected；Institute
State benchmark GTG positive polarity voltage, benchmark GTG negative polarity electricity that D/A converter module is used to provide according to the gray scale compensation device
Pressure, and the reference voltage generator provide in addition to benchmark GTG positive polarity voltage and benchmark GTG reverse voltage
Grey scale reference value, multiple gray scale voltages are generated, and in the data signal exported according to the time schedule controller, from the multiple
An output is chosen in gray scale voltage to the operational amplifying module；The operational amplifying module is also connected with data wire, the fortune
Calculate amplification module to be used to be amplified the gray scale voltage of digital-to-analogue conversion module output, to export as the data voltage
To the data wire.
The another aspect of the embodiment of the present invention, there is provided a kind of display device, including any one display as described above are driven
Dynamic circuit.
A kind of GTG control circuit, display driver circuit and display device provided in an embodiment of the present invention.The GTG controls
Gray scale compensation device connection reference voltage generator and source electrode driver in circuit.The gray scale compensation device is used to obtain reference voltage life
The voltage difference grown up to be a useful person between a benchmark gray scale voltage of output and the data voltage of source electrode driver feedback, and the voltage difference is mended
Repay in input into the benchmark gray scale voltage of source electrode driver.Now, the voltage that GTG control circuit provides to source electrode driver
On the basis of export a benchmark gray scale voltage and above-mentioned voltage difference of voltage generator and.In the case, source electrode driver is worked as
Receive compensation after benchmark gray scale voltage after, the data voltage of reality output can be adjusted, make its with theoretical value more
Adjunction is near, so as to be advantageous to improve display effect.
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 required accompanying drawing used 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.
Fig. 1 is a kind of structural representation of display driver circuit provided in an embodiment of the present invention；
Fig. 2 is the waveform diagram of the data voltage without overcompensation and ideal data voltage；
Fig. 3 is the structural representation of another display driver circuit provided in an embodiment of the present invention；
Fig. 4 is the concrete structure schematic diagram of the first compensating module and the second compensating module in Fig. 3；
Fig. 5 is the structural representation of source electrode driver in Fig. 3；
Fig. 6 is that the waveform of the data voltage through overcompensation, the data voltage without overcompensation and ideal data voltage shows
It is intended to；
Fig. 7 is the concrete structure schematic diagram of the data selector in Fig. 4.
Reference：
01- GTG control circuits；02- source electrode drivers；03- time schedule controllers；10- reference voltage generators；20- GTGs
Compensator；The compensating modules of 201- first；The subtracters of 211- first；212- first adders；The operational amplifiers of 213- first；202-
Second compensating module；The subtracters of 221- second；222- second adders；The operational amplifiers of 223- second；30- data selectors；
40- drives passage；401- D/A converter modules；402- operational amplifying modules.
Embodiment
Below in conjunction with the accompanying drawing in the embodiment of the present invention, the technical scheme in the embodiment of the present invention is carried out clear, complete
Site preparation describes, it is clear that described embodiment is only part of the embodiment of the present invention, rather than whole embodiments.It is based on
Embodiment in the present invention, those of ordinary skill in the art are obtained every other under the premise of creative work is not made
Embodiment, belong to the scope of protection of the invention.
The embodiment of the present invention, as shown in Figure 1, there is provided a kind of GTG control circuit 01, the GTG control circuit 01 include base
Quasi- voltage generator 10 and gray scale compensation device 20.
Wherein, reference voltage generator 10 is used to generate multiple benchmark gray scale voltages (Vgam1, Vgam2 ... VgamN), N
>=2, N are positive integer.Such as N=14.
Gray scale compensation device 20 connects reference voltage generator 10 and source electrode driver 02.The gray scale compensation device 20 is used to obtain
A benchmark gray scale voltage (such as Vgam1) and the source electrode driver 02 that reference voltage generator 10 exports feed back (Feed Back,
FB the voltage difference △ V between data voltage Vdata), and voltage difference △ V are compensated in the base of input to source electrode driver 02
In quasi- gray scale voltage.Now, voltage generator 10 is defeated on the basis of the voltage that GTG control circuit 01 provides to source electrode driver 02
The benchmark gray scale voltage Vgam1 that goes out and above-mentioned voltage difference △ V's and, i.e. Vgam1+ △ V.In the case, source drive is worked as
Device 02 receive compensation after benchmark gray scale voltage after, the data voltage Vdata of reality output can be adjusted, make its with
Theoretical value Vdata is more nearly, so as to be advantageous to improve display effect.
It should be noted that display panel is in display picture, particularly tableaux, sub-pix on the display panel
Light transmittance can keep constant during above-mentioned tableaux is shown.In the case, if by data wire DL to the Asia
The data voltage Vdata that pixel is filled with also keeps constant, and the liquid crystal molecule of the sub-pixel location can keep certain inclined for a long time
Gyration.So, easily cause liquid crystal molecule that aging occurs, and can not deflect.In order to solve the above problems, adjacent two frame
Inputting to the data voltage Vdata of same sub-pix needs that polarity inversion occurs, as shown in Fig. 2 i.e. former frame is inputted to the Asia
For the data voltage Vdata of pixel for common electric voltage Vcom, waveform is located at common electric voltage Vcom top, is positive polarity
(+).And next frame inputs the data voltage Vdata to the sub-pix for common electric voltage Vcom, waveform is positioned at public
Voltage Vcom lower section, it is negative polarity (-).With reference voltage generator 10 generate 14 benchmark gray scale voltages (Vgam1,
Vgam2 ... Vgam14) exemplified by.Wherein, preceding 7 benchmark gray scale voltages (Vgam1, Vgam2 ... Vgam7) are positive polarity.Source
Driver 02 can be according to the data voltage of preceding 7 benchmark gray scale voltage output cathode；7 benchmark gray scale voltages afterwards
(Vgam8, Vgam9 ... Vgam14) is negative polarity, and source electrode driver 02 can export negative according to rear 7 benchmark gray scale voltages
The data voltage of polarity.
However, influenceed due to receiving the resistance of data wire itself line and noise jamming etc., as shown in Figure 2 so that data wire is real
Border is filled with to the data voltage Vdata ' of sub-pix waveform and preferable to having certain deviation between Vdata.Actual number
In waveform according to voltage Vdata ', positive polarity and reverse voltage are for common electric voltage Vcom and asymmetric, so as to shape
It is bad into image retention (Image Sticking) etc..
In the case, in order that obtaining the data voltage Vdata ' and theoretical value Vdata of the reality output of source electrode driver 02
It is more nearly.The positive polarity voltage in the data voltage Vdata ' to reality is not only needed to be adjusted, it is also necessary to reality
Reverse voltage in data voltage Vdata ' is adjusted.
Based on this, above-mentioned GTG control circuit 01 is as shown in figure 3, also include data selector 30.
The data selector 30 connection polarity inversion control signal end POL, source electrode driver 02 and gray scale compensation device 20.
Specifically, above-mentioned polarity inversion control signal end POL is connected with time schedule controller (Tcon) 03.The SECO
Device 03 is used to provide a square wave to polarity inversion control signal end POL, to be used as polarity inversion signal.For example, work as polarity inversion
When control signal end POL exports low level, source electrode driver 02 feeds back positive polarity data voltage；When polarity inversion control signal end
When POL exports high level, source electrode driver 02 feeds back negative polarity data voltage.Or when polarity inversion control signal end POL is defeated
When going out low level, source electrode driver 02 feeds back negative polarity data voltage；When polarity inversion control signal end POL exports high level
When, source electrode driver 02 feeds back positive polarity data voltage.
Based on this, the data selector 30 is used under polarity inversion control signal end POL control, by source electrode driver
The positive polarity or negative polarity data voltage of 02 output end feedback are exported to gray scale compensation device 20, to enable gray scale compensation device 20
Above-mentioned the positive polarity data voltage or negative polarity data voltage are compensated respectively.
On this basis, the gray scale compensation device 20 as shown in figure 3, including：First compensating module 201 and the second compensation mould
Block 202.
Specifically, the positive polarity voltage output end of the first compensating module 201 connection reference voltage generator 10, such as
Vgam1 and source electrode driver 02 input.
It should be noted that reference voltage generator 10 can export 7 positive polarity benchmark gray scale voltage (Vgam1,
Vgam2 ... Vgam7), wherein, reference voltage generator 10 can be according to benchmark gray scale voltage Vgam1 value, to remaining benchmark
Gray scale voltage (Vgam2, Vgam3 ... Vgam7) is adjusted.Therefore optional first compensating module 201 is given birth to reference voltage
Grow up to be a useful person and be capable of output reference gray scale voltage Vgam1 voltage output end on 10 and be connected.
In the case, first compensating module 201 is used for the voltage Vgam1 and source electrode for obtaining positive polarity voltage output end
Voltage difference (△ V1=Vgam1-Vdata) between the positive polarity data voltage Vdata of driver feedback, and by voltage difference △
V1 is compensated in input into the benchmark GTG positive polarity voltage of source electrode driver 02, i.e., inputs Vgam1+ △ V1 to source drive
In device 02.
In addition, the reverse voltage output end of the second compensating module 202 connection reference voltage generator 10, such as Vgam14
With source electrode driver 20.
It should be noted that reference voltage generator 10 can export 7 negative polarity benchmark gray scale voltage (Vgam8,
Vgam9 ... Vgam14), wherein, reference voltage generator 10 can be according to benchmark gray scale voltage Vgam14 value, to its complementary basis
Quasi- gray scale voltage (Vgam8, Vgam9 ... Vgam13) is adjusted.Therefore optional second compensating module 202 and reference voltage
The voltage output end for being capable of output reference gray scale voltage Vgam14 on maker 10 is connected.
In the case, the second compensating module 202 is used for the voltage Vgam14 and source electrode for obtaining reverse voltage output end
Voltage difference (△ V2=Vgam14- (- Vdata)) between the negative polarity data voltage-Vdata that driver 20 feeds back, and should
Voltage difference △ V2 are compensated in input into the benchmark GTG reverse voltage of source electrode driver 20, i.e., input Vgam14+ △ V2
Into source electrode driver 02.
Hereinafter, the concrete structure of the above-mentioned compensating module 202 of first compensating module 201 and second is described in detail.
Wherein, as shown in figure 4, the first compensating module includes the first subtracter 211 and first adder 212.
Wherein, the reverse input end connection data selector 30 of the first subtracter 211, input in the same direction connect reference voltage
The positive polarity voltage output end Vgam1 of maker 10, the output end of the first subtracter 211 connect the in the same direction of first adder 212
Input.In the case, the output end output voltage of the first subtracter 211 is △ V1=Vgam1-Vdata.
The input in the same direction of first adder 212 is also connected with the positive polarity voltage output end of reference voltage generator 10
Vgam1.In the case, the output end output voltage of first adder 212 is Vgam1+ △ V1.
On this basis, above-mentioned first compensating module 201 also includes the first operational amplifier 213.First operation amplifier
The output end of the input in the same direction connection first adder 212 of device 213, the output end and source electrode of first operational amplifier 213
Driver 02 is connected.The voltage that can be exported by above-mentioned first operational amplifier 213 to first adder 212 is put
Greatly.
In addition, the second compensating module 202 includes the second subtracter 221 and second adder 222.Wherein, the second subtracter
221 reverse input end connection data selector 30, the reverse voltage of input connection reference voltage generator 10 in the same direction are defeated
Go out and hold Vgam14, the input in the same direction of the output end connection second adder 222 of the second subtracter 221.In the case, second
The output end output voltage of subtracter 221 is △ V2=Vgam12- (- Vdata).
The input in the same direction of second adder 222 is also connected with the reverse voltage output end of reference voltage generator 10
Vgam14.In the case, the output end output voltage of second adder 222 is Vgam14+ △ V2.
On this basis, the second compensating module 202 also includes the second operational amplifier 223.Second operational amplifier 223
Input in the same direction connection second adder 222 output end, the output end and source electrode driver of second operational amplifier 223
02 is connected.The voltage that can be exported by above-mentioned second operational amplifier 223 to second adder 222 is amplified.
Based on this, as shown in figure 5, above-mentioned source electrode driver 02 includes multiple driving passages 40.Each driving passage is used for
Drive a data line DL.The driving passage 40 includes D/A converter module 401 and operational amplifying module 402.
Wherein, D/A converter module 401 and the output of the above-mentioned operational amplifier 223 of first operational amplifier 213 and second
End is connected, in addition, D/A converter module 401 is also connected with reference voltage generator 10, operational amplifying module 402.
The D/A converter module 401 is used for according to the benchmark ash exported after the enhanced processing of the first operational amplifier 213
Rank positive polarity voltage Vgam1+ △ V1, the benchmark GTG positive polarity exported after the enhanced processing of the second operational amplifier 223 electricity
Press that Vgam14+ △ V2, reference voltage generator 10 provide except said reference GTG positive polarity voltage and benchmark GTG negative pole
Property voltage beyond grey scale reference value (Vgam2, Vgam3 ... Vgam13), each partial pressure electricity in the D/A converter module 401
The lower generation of partial pressure effect of resistance is multiple, such as 256 gray scale voltages.
In addition, D/A converter module 401 is as shown in figure 5, be also connected with time schedule controller 03.In the case, in sequential control
Under the control for the data signal (for example, 8Bit) that device 03 processed exports, the part switch closure in D/A converter module 401, one
Partial switch is opened, and is exported so as to choose a gray scale voltage from above-mentioned 256 gray scale voltages to operational amplifying module
402。
The operational amplifying module 402 is also connected with data wire DL, and the operational amplifying module 402 is used for logarithmic mode conversion module
The gray scale voltage of 401 outputs is amplified, to be exported as data voltage Vdata to data wire DL.Wherein, above-mentioned operation amplifier
Module 402 can be an operational amplifier.
In the case, the benchmark gray scale voltage for driving passage 40 into above-mentioned source electrode driver 02 due to inputting is compensation
Benchmark GTG positive polarity voltage Vgam1+ △ V1 and benchmark GTG positive polarity voltage Vgam14+ △ V2 afterwards, so that source electrode
Driver 02 has also reached corresponding compensation to the data wire DL positive polarity data voltages provided and negative polarity data voltage.So
One, as shown in fig. 6, the data voltage Vdata " after overcompensation relative to the data voltage Vdata ' without overcompensation and
Speech, closer to a reference value Vdata.
In addition, as shown in fig. 7, above-mentioned data selector 30 is also connected with the first supply voltage end Vcc and the second supply voltage
Hold Vss.Wherein, the first supply voltage end Vcc is used to export constant high level.Second supply voltage end Vss is used to export
Constant low level or ground connection.
Above-mentioned data selector 30 includes：The first transistor M1, second transistor M2, third transistor M3 and the 4th are brilliant
Body pipe M4.
The first transistor M1 grid connection polarity inversion control signal end POL, the first pole connection source electrode driver 02,
Second pole is connected with the first compensating module 201.
Second transistor M2 the first pole connection source electrode driver 02, the second pole are connected with the second compensating module 202.
Third transistor M3 grid connection polarity inversion control signal end POL, the first pole connects the first supply voltage end
Vcc, the second pole are connected with second transistor M2 grid.
4th transistor M4 grid connection polarity inversion control signal end POL, the first pole connection second transistor M2's
Grid, the second pole are connected with the second supply voltage end Vss.
Specifically, as shown in fig. 7, above-mentioned the first transistor M1, second transistor M2, third transistor M3 are P-type crystal
Pipe, the 4th transistor M4 is N-type transistor.In the case, when polarity inversion control signal end POL exports low level, the
One transistor M1 is turned on.Now source electrode driver 02 feed back positive polarity data voltage can be exported by the first transistor M1 to
First compensating module 201.Now, third transistor M3 is turned on, so as to which the high level of the first supply voltage end Vcc outputs be transmitted
To second transistor M2 grid so that second transistor M2 is in cut-off state.
In addition, when polarity inversion control signal end POL exports high level, the first transistor M1, third transistor M3 are cut
Only, the 4th transistor M4 is turned on.The low level of second supply voltage end Vss outputs is transmitted to second transistor M2, second crystalline substance
Body pipe M2 is turned on.The negative polarity data voltage that now source electrode driver 02 feeds back can be exported by second transistor M2 to second
Compensating module 202.
The embodiment of the present invention provides a kind of display driver circuit, including the GTG control electricity described in any one as described above
Road 01.In addition the display driver circuit also includes source electrode driver 02 as shown in Figure 3.GTG is mended in the GTG control circuit 01
Repay device 20 and reference voltage generator 10 is connected with source electrode driver 02.
In addition, the structure of the source electrode driver 02 as shown in figure 5, time schedule controller and it is multiple driving passage 40, each
Driving passage 40 is used to drive a data line DL.The driving passage 40 includes D/A converter module 401 and computing as shown in Figure 3
Amplification module 402.Wherein, the concrete structure and connected mode of D/A converter module 401 and operational amplifying module 402 are same as above institute
State, here is omitted.
It should be noted that above-mentioned kind of display driver circuit has the phase of GTG control circuit 01 provided with previous embodiment
Same technique effect, here is omitted.
The embodiment of the present invention provides a kind of display device, including display driver circuit as described above, has and foregoing reality
The display driver circuit identical technique effect of example offer is applied, here is omitted.
In embodiments of the present invention, display device can specifically include liquid crystal display device, such as the display device can be with
For any product or part with display function such as display, TV, DPF, mobile phone or tablet personal computer.
The foregoing is only a specific embodiment of the invention, but protection scope of the present invention is not limited thereto, any
Those familiar with the art the invention discloses technical scope in, change or replacement can be readily occurred in, should all be contained
Cover within protection scope of the present invention.Therefore, protection scope of the present invention should be based on the protection scope of the described claims.
Claims (10)
1. a kind of GTG control circuit, it is characterised in that the GTG control circuit includes reference voltage generator and GTG
Compensator；
The gray scale compensation device connects the reference voltage generator and source electrode driver；The gray scale compensation device is used to obtain institute
State the voltage between a benchmark gray scale voltage of reference voltage generator output and the data voltage of source electrode driver feedback
Difference, and the voltage difference is compensated in input into the benchmark gray scale voltage of the source electrode driver.
2. GTG control circuit according to claim 1, it is characterised in that the GTG control circuit also includes data and selected
Select device, the first compensating module and the second compensating module；
Data selector connection polarity inversion control signal end, the source electrode driver and the gray scale compensation device；Institute
State data selector to be used under the control of the polarity inversion control signal end, by source electrode driver output end feedback
Positive polarity or negative polarity data voltage are exported to the gray scale compensation device；
First compensating module connects the positive polarity voltage output end of the reference voltage generator and the source electrode driver；
First compensating module is used for the voltage for obtaining the positive polarity voltage output end and the positive pole of source electrode driver feedback
Property data voltage between voltage difference, and by the voltage difference compensate in input to the source electrode driver benchmark GTG positive polarity
In voltage；
Second compensating module connects the reverse voltage output end of the reference voltage generator and the source electrode driver；
Second compensating module is used for the voltage for obtaining the reverse voltage output end and the negative pole of source electrode driver feedback
Property data voltage between voltage difference, and by the voltage difference compensate in input to the source electrode driver benchmark GTG negative polarity
In voltage.
3. GTG control circuit according to claim 2, it is characterised in that first compensating module includes the first subtraction
Device and first adder；
The reverse input end of first subtracter connects the data selector, and input in the same direction connects the reference voltage life
The positive polarity voltage output end grown up to be a useful person, the output end of first subtracter connect the input in the same direction of the first adder；
The input in the same direction of the first adder is also connected with the positive polarity voltage output end of the reference voltage generator.
4. GTG control circuit according to claim 3, it is characterised in that first compensating module also includes the first fortune
Calculate amplifier；
The input in the same direction of first operational amplifier connects the output end of the first adder, first operation amplifier
The output end of device is connected with the source electrode driver.
5. GTG control circuit according to claim 2, it is characterised in that second compensating module includes the second subtraction
Device and second adder；
The reverse input end of second subtracter connects the data selector, and input in the same direction connects the reference voltage life
The reverse voltage output end grown up to be a useful person, the output end of second subtracter connect the input in the same direction of the second adder；
The input in the same direction of the second adder is also connected with the reverse voltage output end of the reference voltage generator.
6. GTG control circuit according to claim 5, it is characterised in that second compensating module also includes the second fortune
Calculate amplifier；
The input in the same direction of second operational amplifier connects the output end of the second adder, second operation amplifier
The output end of device is connected with the source electrode driver.
7. according to the GTG control circuit described in claim any one of 2-6, it is characterised in that the data selector is also connected with
First supply voltage end and the second supply voltage end；The data selector includes：The first transistor, second transistor, the 3rd
Transistor and the 4th transistor；
The grid of the first transistor connects the polarity inversion control signal end, and the first pole connects the source electrode driver,
Second pole is connected with first compensating module；
First pole of the second transistor connects the source electrode driver, the second pole is connected with second compensating module；
The grid of third transistor connects the polarity inversion control signal end, and the first pole connects the first supply voltage end,
Second pole is connected with the grid of the second transistor；
The grid of 4th transistor connects the polarity inversion control signal end, and the first pole connects the second transistor
Grid, the second pole are connected with the second supply voltage end.
A kind of 8. display driver circuit, it is characterised in that including the GTG control circuit as described in claim any one of 1-7,
The display driver circuit also includes source electrode driver；Gray scale compensation device and reference voltage generator in the GTG control circuit
It is connected with the source electrode driver.
9. display driver circuit according to claim 8, it is characterised in that the source electrode driver includes time schedule controller
And multiple driving passages, it is each to drive passage to be used to drive a data line；
The driving passage includes D/A converter module and operational amplifying module；
The D/A converter module and the gray scale compensation device, the reference voltage generator, the time schedule controller and institute
Operational amplifying module is stated to be connected；The D/A converter module is used for the benchmark GTG positive pole provided according to the gray scale compensation device
Property voltage, benchmark GTG reverse voltage, and the reference voltage generator provide except benchmark GTG positive polarity voltage
With the grey scale reference value beyond benchmark GTG reverse voltage, multiple gray scale voltages are generated, and according to the time schedule controller
The data signal of output, an output is chosen from the multiple gray scale voltage to the operational amplifying module；
The operational amplifying module is also connected with data wire, and the operational amplifying module is used for digital-to-analogue conversion module output
Gray scale voltage is amplified, to be exported as the data voltage to the data wire.
10. a kind of display device, it is characterised in that including display driver circuit as claimed in claim 8 or 9.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201710872734.2A CN107452354B (en) | 2017-09-22 | 2017-09-22 | Gray scale control circuit, display driving circuit and display device |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710872734.2A CN107452354B (en) | 2017-09-22 | 2017-09-22 | Gray scale control circuit, display driving circuit and display device |
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| CN107452354B CN107452354B (en) | 2020-12-04 |
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| CN201710872734.2A Expired - Fee Related CN107452354B (en) | 2017-09-22 | 2017-09-22 | Gray scale control circuit, display driving circuit and display device |
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