CN104424903B - Voltage calibration circuit and liquid crystal display device thereof - Google Patents
Voltage calibration circuit and liquid crystal display device thereof Download PDFInfo
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- CN104424903B CN104424903B CN201410102810.8A CN201410102810A CN104424903B CN 104424903 B CN104424903 B CN 104424903B CN 201410102810 A CN201410102810 A CN 201410102810A CN 104424903 B CN104424903 B CN 104424903B
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- 239000004973 liquid crystal related substance Substances 0.000 title claims abstract description 77
- 238000010168 coupling process Methods 0.000 claims abstract description 23
- 238000005859 coupling reaction Methods 0.000 claims abstract description 23
- 230000008878 coupling Effects 0.000 claims abstract description 21
- 238000001514 detection method Methods 0.000 claims abstract description 6
- 230000003071 parasitic effect Effects 0.000 abstract description 12
- 239000003990 capacitor Substances 0.000 abstract description 5
- 238000000034 method Methods 0.000 abstract description 2
- 238000010586 diagram Methods 0.000 description 18
- 230000005611 electricity Effects 0.000 description 13
- 239000010409 thin film Substances 0.000 description 11
- 238000004519 manufacturing process Methods 0.000 description 5
- 238000004088 simulation Methods 0.000 description 4
- 230000008859 change Effects 0.000 description 3
- 230000009471 action Effects 0.000 description 2
- 239000013078 crystal Substances 0.000 description 2
- 239000007788 liquid Substances 0.000 description 2
- 230000004308 accommodation Effects 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- 238000004891 communication Methods 0.000 description 1
- 238000013499 data model Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 230000006870 function Effects 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 239000003973 paint Substances 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
Classifications
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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
- G09G3/3611—Control of matrices with row and column drivers
- G09G3/3696—Generation of voltages supplied to electrode drivers
-
- 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
- G09G3/3648—Control of matrices with row and column drivers using an active matrix
- G09G3/3655—Details of drivers for counter electrodes, e.g. common electrodes for pixel capacitors or supplementary storage capacitors
-
- G—PHYSICS
- G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
- G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
- G09G2310/00—Command of the display device
- G09G2310/06—Details of flat display driving waveforms
- G09G2310/061—Details of flat display driving waveforms for resetting or blanking
-
- G—PHYSICS
- G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
- G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
- G09G2320/00—Control of display operating conditions
- G09G2320/02—Improving the quality of display appearance
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- Chemical & Material Sciences (AREA)
- Crystallography & Structural Chemistry (AREA)
- Physics & Mathematics (AREA)
- Computer Hardware Design (AREA)
- General Physics & Mathematics (AREA)
- Theoretical Computer Science (AREA)
- Power Engineering (AREA)
- Control Of Indicators Other Than Cathode Ray Tubes (AREA)
- Liquid Crystal Display Device Control (AREA)
- Liquid Crystal (AREA)
Abstract
The invention discloses a voltage calibration circuit and a liquid crystal display device thereof, which can actively detect a coupling voltage without a burning process. The voltage calibration circuit includes a coupling voltage detection circuit and a common voltage circuit. The coupling voltage detection circuit is used for detecting a coupling voltage in an initial period and generating a compensation voltage according to the coupling voltage, wherein the coupling voltage is generated by a plurality of parasitic capacitors on falling edges of a plurality of grid signals. The common voltage circuit is used for adjusting a common voltage according to the compensation voltage in a display period and outputting the common voltage to a display module.
Description
Technical field
The present invention relates to a kind of voltage calibration circuit and associated liquid crystal display device, more particularly to one kind can actively detect one
The voltage calibration circuit and its associated liquid crystal display device of coupled voltages.
Background technology
Liquid crystal display (Liquid Crystal Display Device；LCD Device) have external form it is frivolous, save
The advantages that electricity and Low emissivity, therefore it has been widely used in computer screen, mobile phone, personal digital assistant（PDA）、
On the electronic product such as flat-surface television and other communication/amusement equipment.The operation principle of liquid crystal display is to utilize to change liquid
The voltage difference at crystal layer both ends changes the ordered state of the liquid crystal molecule in liquid crystal layer, changes the translucency of liquid crystal layer according to this, then
Coordinate the light source that backlight module is provided to show image.
Thin film transistor (TFT)（Thin Film Transistor, TFT）Liquid crystal display is the display presently the most popularized
Equipment, no matter the function and framework of display module or driving chip are gradually ripe.Figure 1A is refer to, Figure 1A is existing skill
The schematic diagram of a thin film transistor liquid crystal display equipment 10 in art.Thin film transistor liquid crystal display equipment 10 includes a display module
120th, one source driver（source driver）160 and gate drivers（gate driver）180.Display module 120
It is provided with data wire parallel to each other（data line）D1~Dm, gate line parallel to each other（gate line）G1~Gn and aobvious
Show unit P11~Pmn.Data wire D1~Dm and 1~Gn of gate lines G settings interlaced with each other, and display unit P11~Pmn then divides
Not She Yu corresponding data wire and gate line confluce.Source electrode driver 160 and gate drivers 180 produce driving letter respectively
Number and signal.Each display unit on display module 120 all includes a thin film transistor switch 100 and liquid crystal electricity
Holding 140, one end of each liquid crystal capacitance is coupled to a corresponding data wire by a corresponding thin film transistor switch, and
The other end is then coupled to a common voltage Vcom.A display is opened when receiving signal caused by gate drivers 180
During the thin film transistor switch of unit, the liquid crystal capacitance of this display unit can be electrically connected to its corresponding data wire to connect
The drive signal transmitted from source electrode driver 160 is received, therefore display unit can control according to the electric charge of its liquid crystal capacitance internal memory
The degree of rotation of liquid crystal molecule, to show the image of different GTGs.
There is a parasitic capacitance 111 in each display unit.When the moment that 1~Gn of gate lines G is opened or closed, voltage
Change can have influence on display unit P11~Pmn voltage via parasitic capacitance 111.When 1~Gn of gate lines G is opened, therefore meeting
Display unit P11~Pmn voltage is charged to correct voltage.When 1~Gn of gate lines G is closed, parasitic capacitance 111 can shown
A downward coupled voltages are produced on unit P11~Pmn, because source electrode driver 160 has not recharged, and make it that display is single
First P11~Pmn generating positive and negative voltage is symmetrical with Vcom, and wherein Vcom exports for a fixed voltage.So that same display data
Positive and negative liquid crystal degree of rotation it is identical and show same gray level.But because the drift of LCD processing procedure can cause different LCD
The little bit different of panel parasitic capacitance 111, this causes some LCDs to differ greatly after 1~Gm of gate lines G closings, to post
Raw electric capacity 111 can be asymmetric with Vcom to the generating positive and negative voltage after display unit P11~Pmm downwards coupling, cause to show GTG
Difference and cause LCD flash (flicker) phenomenon.
Figure 1B is refer to, Figure 1B is an oscillogram of each display unit in Figure 1A.In fig. ib, gate line is worked as（Such as：
G1）By a negative potential VGL（Such as：-12V）Rise to a positive potential VGH（Such as：15V）When, represent that gate line is opened, wherein GND is to connect
Ground level.Source electrode driver 160 is filled with a display voltage to storage capacitors 140.When gate line is closed, grid voltage is by positive electricity
Position VGH（Such as：15V）It is down to negative potential VGL（Such as：-12V）.Now, because of the presence of parasitic capacitance 111 so that storage capacitors 140
It is coupled a magnitude of voltage（Normally about 1V or so）, it is electric that the identical data magnitude of voltage after this coupling can be symmetrical with a LCD copolar
Press Vcom.When the difference of parasitic capacitance 111 of different LCDs is excessive, display unit P11~Pmm after coupling can be asymmetric
Scintillation is caused in Vcom.
In order to solve this scintillation, prior art is by there is one group of non-voltile memory (NVM), and it is according to every liquid crystal
The degree of display device module flicker goes to adjust common voltage.However, this, which is acted, has caused more than modular manufacture one of imprinting flow.
The content of the invention
Therefore, the main object of the present invention is to provide a kind of liquid crystal display, can actively detect a coupled voltages,
Need not an imprinting flow.
The present invention discloses a kind of voltage calibration circuit.The voltage calibration circuit include a coupled voltages circuit for detecting with
An and common potential circuit.The coupled voltages circuit for detecting is used for detecting a coupled voltages in an initial period and according to institute
State coupled voltages and produce an offset voltage.The common voltage circuit, for being adjusted in a display cycle according to the offset voltage
A whole common voltage and the output common voltage are to a display module.
Invention additionally discloses a kind of liquid crystal display.The liquid crystal display includes a display module, a grid
Drive circuit, a source electrode drive circuit and a voltage calibration circuit.The display module includes multiple stray capacitances.It is described
Gate driving circuit, for producing multiple signals.The source electrode drive circuit, the display module is coupled to, for defeated
Go out a display voltage to the display module.The voltage calibration circuit includes a coupled voltages circuit for detecting and one common
Potential circuit.The coupled voltages circuit for detecting is used for detecting a coupled voltages in an initial period and according to the coupling electricity
Pressure produces an offset voltage.The common voltage circuit, for common according to offset voltage adjustment one in a display cycle
Voltage and the output common voltage are to a display module.
Invention additionally discloses a kind of voltage calibration circuit.The voltage calibration circuit includes a coupled voltages circuit for detecting
An and source electrode drive circuit.The coupled voltages circuit for detecting, for detecting a coupled voltages and root in an initial period
An offset voltage is produced according to the coupled voltages.The source electrode drive circuit, for electric according to the compensation in a display cycle
Pressure output one shows voltage to a display module.
Invention additionally discloses a kind of liquid crystal display.The liquid crystal display includes a display module, a grid
Drive circuit and a voltage calibration circuit.The display module includes multiple stray capacitances.The gate driving circuit, use
To produce multiple signals.The voltage calibration circuit includes a coupled voltages circuit for detecting and source drive electricity
Road.The coupled voltages circuit for detecting, for detecting a coupled voltages in an initial period and being produced according to the coupled voltages
A raw offset voltage.The source electrode drive circuit, for showing voltage according to offset voltage output one in a display cycle
To a display module.
Brief description of the drawings
Figure 1A is the electrical block diagram of an existing liquid crystal display.
Figure 1B is the oscillogram of each display unit in Figure 1A.
Fig. 2A is the theory diagram of the liquid crystal display of the embodiment of the present invention one.
Fig. 2 B are an oscillogram of the display unit of the embodiment of the present invention one.
Fig. 2 C are the example embodiment of the coupled voltages circuit for detecting 260 of the present invention.
Fig. 3 is the theory diagram of the liquid crystal display of the embodiment of the present invention one.
Fig. 4 is the theory diagram of the liquid crystal display of the embodiment of the present invention one.
Fig. 5 is the theory diagram of the liquid crystal display of the embodiment of the present invention one.
Fig. 6 A are the theory diagram of the liquid crystal display of the embodiment of the present invention one.
Fig. 6 B are an oscillogram of the display unit of the embodiment of the present invention one.
Fig. 7 is the theory diagram of the liquid crystal display of the embodiment of the present invention one.
Fig. 8 is the theory diagram of the liquid crystal display of the embodiment of the present invention one.
Fig. 9 figures are the theory diagram of the liquid crystal display of the embodiment of the present invention one.
Wherein, description of reference numerals is as follows：
10 thin film transistor liquid crystal display equipment
120th, 200,300,400,500 display module
160 source electrode drivers
180 gate drivers
D1~Dm data wires
G1~Gn gate lines
P11~Pmn display units
140 liquid crystal capacitances
100 thin film transistor switch
Vcom common voltages
250th, 350,450,550,650,750,850, voltage calibration circuit
950
20th, 30,40,50 liquid crystal display
220th, 320,420,520 source electrode drive circuit
240th, 340,440,540 gate driving circuit
260th, 360,460,560 coupled voltages circuit for detecting
280th, 380,480,580 common voltage circuit
290th, 390,490,590,591 switch
262 analog-digital converters
264 look-up tables
266 digital analog converters
VFD、VFD_sourceCoupled voltages
TVCOMCommon voltage end points
VSHFTOffset voltage
310th, 510 voltage setup unit
Vcs, Vcs ' display voltage
Embodiment
Fig. 2A is refer to, Fig. 2A is the schematic diagram of the liquid crystal display 20 of the embodiment of the present invention one.Liquid crystal display 20
Include a display module 200, a source electrode drive circuit 220, a gate driving circuit 240 and a voltage calibration circuit 250.
Voltage calibration circuit 250 includes a coupled voltages circuit for detecting 260, a common switch of potential circuit 280 and one 290.Liquid crystal
The framework of display device 20 is similar to Fig. 1 thin film transistor liquid crystal display equipment 10, therefore mutually exists together and repeat no more.Raster data model
Circuit 240, for producing multiple signals, to beat opening/closing plural number bar gate line in proper order.Source electrode drive circuit 220 is used for
When gate line is opened（That is, a positive potential is risen to by a negative potential）, it is multiple to display module 200 to input multiple display voltages
Storage capacitors.Display module 200 is in the drop edge of multiple signals（That is, plural bar gate line is closed）When, display module
200 parasitic capacitance（The 111 of Figure 1A）A coupled voltages V can be producedFD, a common voltage end point of drop-down display module 200
TVCOMA common voltage Vcom.Coupled voltages circuit for detecting 260, the common electricity of display module 200 is coupled to by switch 290
Pressure side point TVCOM, in an initial period of liquid crystal display 20, detecting coupled voltages VFDAnd according to coupled voltages VFD
Produce an offset voltage VSHFT.Wherein, the initial period of liquid crystal display 20 be liquid crystal display 20 start shooting after, and show
A period before picture.Common voltage circuit 280 is coupled to the common voltage end points T of display module 200 by switch 290VCOM,
For in the display cycle of liquid crystal display 20 1, according to offset voltage VSHFT, adjust common voltage Vcom and output be common
Voltage Vcom is to display module 200.Wherein, the display cycle of liquid crystal display 20 is the display picture of liquid crystal display 20
During one.Switch 290 is coupled to display module 200, coupled voltages circuit for detecting 260 and common voltage circuit 280, for controlling
Display module 200 processed is coupled to common voltage circuit 280 or coupled voltages circuit for detecting 260.Therefore, the liquid of the embodiment of the present invention
Crystal display device 20 can detect coupled voltages V caused by parasitic capacitance in the initial period of liquid crystal display 20FD, and it is main
Dynamic adjustment common voltage Vcom, to avoid the situation of flicker, and need not carry out the action of imprinting, with economization processing time, increase
Unit production capacity.
Fig. 2 B are please also refer to, Fig. 2 B are an oscillogram of the display unit of the embodiment of the present invention one.For in detail, in first
Begin the cycle, common voltage Vcom is first given tacit consent to an initial voltage value（Such as：0V）.When gate driving circuit 240 closes gate line
When（That is, negative potential VGL is down to by positive potential VGH）, the common voltage end points T of the control display module 200 of switch 290VCOMCoupling
To coupled voltages circuit for detecting 260.Coupled voltages circuit for detecting 260 detects coupled voltages VFDAnd according to coupled voltages VFDProduction
Raw offset voltage VSHFT.It is preferred that coupled voltages VFDA buffer of coupled voltages circuit for detecting 260 can be stored in（Do not paint
It is shown in Fig. 2）In.In the display cycle, the common voltage end points T of the control display module 200 of switch 290VCOMIt is coupled to common voltage
Circuit 280, common voltage circuit 280 is according to offset voltage VSHFTCommon voltage Vcom is adjusted, and exports common voltage Vcom extremely
Display module 200.For example, it is 0V when common voltage Vcom is initial.When gate line is closed, coupled voltages circuit for detecting
260 detecting coupled voltages VFD=-0.6V, and according to coupled voltages VFDProduce offset voltage VSHFT=-1.2V.In the display cycle,
Common voltage circuit 280 is according to offset voltage VSHFTCommon voltage Vcom is adjusted to -1.2V downwards from 0V, and exports -1.2V
Common voltage Vcom to display module 200.
Fig. 2 C are please also refer to, Fig. 2 C are the example embodiment of the coupled voltages circuit for detecting 260 of the present invention.Not according to this
It is limited.Coupled voltages circuit for detecting 260 includes an analog-digital converter 262, a look-up table 264 and a digital simulation and turned
Parallel operation 266.Analog-digital converter 262 is used for receiving the coupled voltages V of simulationFD, and by coupled voltages VFDBe converted to a numeral
Value DFD.Look-up table 264 is according to digital value DFD, output offset voltage VSHFTAnswer the corresponding digital value DSHFT.Digital simulation
Converter 266 is used for the digital value D according to offset voltageSHFTThe offset voltage V of conversion extremely simulationSHFT。
In embodiments of the present invention, voltage calibration circuit can also include a voltage setup unit.Fig. 3 is refer to, Fig. 3 is this
Invent the schematic diagram of another embodiment liquid crystal display 30.In figure 3, liquid crystal display 30 includes a display module
300th, a source electrode drive circuit 320, a gate driving circuit 340 and a voltage calibration circuit 350.Voltage calibration circuit 350
Include a coupled voltages circuit for detecting 360, the common switch 390 of potential circuit 380, one and a voltage setup unit 310.This
Embodiment difference shown in embodiment and Fig. 2A is voltage setup unit 310, be coupled to coupled voltages circuit for detecting 360 and
Common voltage circuit 380, for setting the one of common voltage Vcom skew default value.When gate driving circuit 240 closes grid
During line, the common voltage end points T of the control display module 300 of switch 390VCOMIt is coupled to coupled voltages circuit for detecting 360.Coupling electricity
Circuit for detecting 360 is pressed to detect coupled voltages VFD, and by with coupled voltages VFDA relational expression, or use look-up table mode,
Produce offset voltage VSHFT.In the display cycle, the common voltage end points T of the control display module 300 of switch 390VCOMIt is coupled to common
Potential circuit 380, common voltage circuit 380 is according to common voltage Vcom skew default value and offset voltage VSHFTCompare and add
Multiply, adjust the common voltage Vcom after common voltage Vcom and output adjustment to display module 300.For example, common voltage
It is 0V when Vcom is initial.When gate line is closed, coupled voltages circuit for detecting 360 detects coupled voltages VFD=-0.6V, voltage are set
Order member 310 sets common voltage Vcom skew default value as -1V.Therefore, coupled voltages circuit for detecting 360 is according to coupling electricity
Press VFDProduce offset voltage VSHFT=-0.2V.In the display cycle, common voltage circuit 380 compares plus multiplies offset voltage VSHFTWith
And common voltage Vcom skew default value（That is, -0.2V+-1V）, common voltage Vcom is adjusted downwards to -1.2V from 0V,
And -1.2V common voltage Vcom is exported to display module 300.
In other embodiments of the present invention, common voltage of the coupled voltages circuit for detecting except being coupled to display module 200
End points TVCOM, detecting coupled voltages VFDOutside, coupled voltages circuit for detecting can also be coupled to source electrode drive circuit, detecting data line
Coupled voltages, or source electrode drive circuit and common voltage end points T are coupled to simultaneouslyVCOM.Fig. 4 is refer to, Fig. 4 is another for the present invention
The schematic diagram of one embodiment liquid crystal display 40.In Fig. 4, liquid crystal display 40 includes a display module 400, a source
Pole drive circuit 420, a gate driving circuit 440 and a voltage calibration circuit 450.Voltage calibration circuit 450 includes one
Coupled voltages circuit for detecting 460, a common switch of potential circuit 480 and one 490.Display device 40 and liquid crystal display 20
Difference is in the coupling relation for switching 490 is different from switch 290.Switch 490 is coupled to display module 400, source drive electricity
Road 420 and coupled voltages circuit for detecting 460, for controlling display module 400 to be coupled to source electrode drive circuit 420 or coupling electricity
Press circuit for detecting 460.When gate driving circuit 440 closes gate line, the common voltage of the control display module 400 of switch 490
End points TVCOMIt is coupled to coupled voltages circuit for detecting 460, the coupled voltages of the detecting data line of coupled voltages circuit for detecting 460
VFD_sourceAnd according to coupled voltages VFD_sourceProduce offset voltage VSHFT.It is preferred that the coupled voltages V of data wireFD_source
About with common voltage end point TVCOMCoupled voltages VFDIt is identical.In the display cycle, the control display module 400 of switch 490 couples
To source electrode drive circuit 420, common voltage circuit 480 is according to offset voltage VSHFTCommon voltage Vcom is adjusted, and is exported common
Voltage Vcom is to display module 400.
Fig. 5 is refer to, Fig. 5 is the schematic diagram of another embodiment of the present invention liquid crystal display 50.Liquid crystal display 50
Include a display module 500, a source electrode drive circuit 520, a gate driving circuit 540 and a voltage calibration circuit 550.
Voltage calibration circuit 550 includes a coupled voltages circuit for detecting 560, a common potential circuit 580, a voltage setup unit
510th, a first switch 590 and a second switch 591.Voltage calibration circuit 550 combines voltage calibration circuit 350 and voltage
Circuit 450 is calibrated, therefore basic framework is roughly the same, and unique difference, which is in, to be included second in voltage calibration circuit more than 550 and open
Close 591.First switch 590 is coupled to display module 500, source electrode drive circuit 520 and coupled voltages circuit for detecting 560, uses
To control display module 500 to be coupled to source electrode drive circuit 520 or coupled voltages circuit for detecting 560.Second switch 591 is coupled to
Display module 500, common voltage circuit 580 and coupled voltages circuit for detecting 560, for controlling display module 500 to be coupled to
Common voltage circuit 580 or coupled voltages circuit for detecting 560.When gate driving circuit 540 closes gate line, first switch
590 control display modules 500 are coupled to coupled voltages circuit for detecting 560, and second switch 591 controls the common of display module 500
Voltage end points TVCOMIt is coupled to circuit for detecting 560.That is, coupled voltages circuit for detecting 560 detects display module 500 simultaneously
Data wire coupled voltages VFD_sourceAnd common voltage end points TVCOMCoupled voltages VFD, and according to coupled voltages VFDWith
And VFD_source, produce offset voltage VSHFT.In the display cycle, first switch 590 controls display module 500 to be coupled to source electrode drive
Dynamic circuit 520, second switch 591 control the common voltage end points T of display module 500VCOMCommon voltage circuit 580 is coupled to,
Common voltage circuit 580 is according to common voltage Vcom skew default value and offset voltage VSHFTCompare plus multiply, adjustment is common
Voltage Vcom, and common voltage Vcom is exported to display module 500.
Fig. 6 A are refer to, Fig. 6 A are the schematic diagram of the liquid crystal display 60 of the embodiment of the present invention one.Liquid crystal display 60
Include a display module 600, a gate driving circuit 640 and a voltage calibration circuit 650.Voltage calibration circuit 650 wraps
Contain a source electrode drive circuit 620, a coupled voltages circuit for detecting 660 and a switch 690.The framework of liquid crystal display 60
It is similar to Fig. 1 thin film transistor liquid crystal display equipment 10, therefore mutually exist together and repeat no more.Gate driving circuit 640, for producing
Multiple signals, to beat opening/closing plural number bar gate line.Display module 600 is in the drop edge of multiple signals（That is,
Plural bar gate line is closed）When, the parasitic capacitance of display module 600 can produce a coupled voltages VFD.Switch 690 is coupled to coupling
Voltage detection circuit 660, for controlling display module 600 to be coupled to an earth terminal 680 or coupled voltages circuit for detecting 660.When
One common voltage end point T of display module 600VCOMWhen being coupled to earth terminal 680, common voltage Vcom is fixed as 0V.Coupling electricity
Pressure circuit for detecting 660 is coupled to the common voltage end points T of display module 600 by switch 690VCOM.Coupled voltages circuit for detecting
660 are used for the initial period detecting coupled voltages V in liquid crystal display 60FDAnd according to coupled voltages VFDOne is produced to mend
Repay voltage VSHFT.Wherein, the initial period of liquid crystal display 60 is after liquid crystal display 60 is started shooting, and before display picture
During one.Source electrode drive circuit 620 be used in initial period output one do not adjust display voltage Vcs ' to display module 600 and
In a display cycle according to offset voltage VSHFTOutput one shows voltage Vcs to display module 600.Therefore, the embodiment of the present invention
Liquid crystal display 60 can in the initial period of liquid crystal display 60, detect parasitic capacitance caused by coupled voltages VFD,
And active accommodation shows voltage, to avoid the situation of flicker, and the action of imprinting need not be carried out, with economization processing time, increase
Unit production capacity.
Fig. 6 B are please also refer to, Fig. 6 B are an oscillogram of the display unit of the embodiment of the present invention one.In an initial period, altogether
First give tacit consent to an initial voltage value with voltage Vcom（Such as：0V）, source electrode driver 620, which exports, does not adjust display voltage Vcs ' extremely
Multiple storage capacitors of display module 600.When gate driving circuit 640 closes gate line（That is, it is down to by positive potential VGH negative
Current potential VGL）, the common voltage end points T of the control display module 600 of switch 690VCOMIt is coupled to coupled voltages circuit for detecting 660.Coupling
Close voltage detection circuit 660 and detect coupled voltages VFDAnd according to coupled voltages VFDProduce offset voltage VSHFT.It is preferred that coupling
Voltage VFDA buffer of coupled voltages circuit for detecting 660 can be stored in（It is not illustrated in Fig. 6 A）In.In the display cycle, switch
The common voltage end points T of 690 control display modules 600VCOMIt is coupled to earth point 680 so that common voltage end points TVCOMIt is common
Voltage Vcom is fixed as 0V.Coupled voltages circuit for detecting 660 exports offset voltage VSHFTTo source electrode drive circuit 620.Source electrode drives
Dynamic circuit 620 is according to offset voltage VSHFTIn display cycle output display voltage Vcs to display module.
In embodiments of the present invention, voltage calibration circuit can also include a voltage setup unit.Fig. 7 is refer to, Fig. 7 is this
Invent the schematic diagram of another embodiment liquid crystal display 70.In the figure 7, liquid crystal display 70 includes a display module
700th, a gate driving circuit 740 and a voltage calibration circuit 750.Voltage calibration circuit 750 includes source drive electricity
Road 720, a coupled voltages circuit for detecting 760, one switch 790 and a voltage setup unit 710.The basic frame of display device 70
Structure is similar with display device 60, and difference is in voltage setup unit 710 is coupled to coupled voltages circuit for detecting 760 and source
Pole drive circuit 720, for setting a skew default value of display voltage.When gate driving circuit 740 closes gate line, open
Close the common voltage end points T of 790 control display modules 700VCOMIt is coupled to coupled voltages circuit for detecting 760.Coupled voltages are detected
Circuit 760 detects coupled voltages VFD, and according to coupled voltages VFDProduce offset voltage VSHFT.In the display cycle, the control of switch 790
The common voltage end points T of display module 700VCOMEarth terminal 780 is coupled to, source electrode drive circuit 720 compares plus multiplies the skew
Default value and offset voltage VSHFT, adjustment shows voltage Vcs ' and display voltage Vcs after display cycle output adjustment is extremely
Display module 700.
In other embodiments of the present invention, coupled voltages circuit for detecting is except being coupled to the common of display module 600,700
Voltage end points TVCOM, detecting coupled voltages VFDOutside, coupled voltages circuit for detecting can also be coupled to source electrode drive circuit, to detect number
According to the coupled voltages of line, or source electrode drive circuit and common voltage end points T are coupled to simultaneouslyVCOM.Fig. 8 is refer to, Fig. 8 is this
Invent the schematic diagram of another embodiment liquid crystal display 80.In fig. 8, liquid crystal display 80 includes a display module
800th, a gate driving circuit 840 and a voltage calibration circuit 850.Voltage calibration circuit 850 includes source drive electricity
Road 820, a coupled voltages circuit for detecting 860 and a switch 890.The difference of liquid crystal display 80 be in, switch 890 coupling
Connect relation and be different from switch 690, and display module 800 is coupled directly to an earth terminal 880.Switch 890 is coupled to display mould
Block 800, source electrode drive circuit 820 and coupled voltages circuit for detecting 860, driven for controlling display module 800 to be coupled to source electrode
Dynamic circuit 820 or coupled voltages circuit for detecting 860.When gate driving circuit 840 closes gate line, the control display of switch 890
Module 800 is coupled to coupled voltages circuit for detecting 860.Then, the coupled voltages of the detecting data line of coupled voltages circuit for detecting 860
VFD_sourceAnd according to coupled voltages VFD_sourceProduce offset voltage VSHFT.It is preferred that the coupled voltages V of data wireFD_source
About with common voltage end point TVCOMCoupled voltages VFDIt is identical.In the display cycle, the control display module 800 of switch 890 couples
To source electrode drive circuit 820, source electrode drive circuit 820 is according to offset voltage VSHFTAdjustment shows voltage Vcs ', and in display week
Phase output display voltage Vcs is to display module 800.
Fig. 9 is refer to, Fig. 9 is the schematic diagram of another embodiment of the present invention liquid crystal display 90.Liquid crystal display 90
Include a display module 900, a gate driving circuit 940 and a voltage calibration circuit 950.Voltage calibration circuit 950 wraps
Contain a source electrode drive circuit 920, a coupled voltages circuit for detecting 960, an earth terminal 980, a voltage setup unit 910, one
The second switch 991 of first switch 990 and one.Liquid crystal display 90 combines liquid crystal display 70 and liquid crystal display
80, therefore basic framework is roughly the same, unique difference is in includes second switch 991 in voltage calibration circuit more than 950.First
Switch 990 is coupled to display module 900, source electrode drive circuit 920 and coupled voltages circuit for detecting 960, for controlling display
Module 900 is coupled to source electrode drive circuit 920 or coupled voltages circuit for detecting 960.Second switch 991 is coupled to display module
900th, earth terminal 980 and coupled voltages circuit for detecting 960, for controlling the common voltage end points T of display module 900VCOMCoupling
It is connected to an earth terminal 980 or coupled voltages circuit for detecting 960.When gate driving circuit 940 closes gate line, first switch
990 control display modules 900 are coupled to coupled voltages circuit for detecting 960, and second switch 991 controls the common of display module 900
Voltage end points TVCOMIt is coupled to circuit for detecting 960.That is, coupled voltages circuit for detecting 960 detects display module 900 simultaneously
Data wire coupled voltages VFD_sourceAnd common voltage end points TVCOMCoupled voltages VFD, and according to coupled voltages VFDWith
And coupled voltages VFD_source, produce offset voltage VSHFT.In the display cycle, first switch 990 controls display module 900 to couple
To source electrode drive circuit 920, second switch 991 controls the common voltage end points T of display module 900VCOMIt is coupled to earth terminal
980 so that common voltage Vcom is fixed as 0V.Source electrode driver 920 is according to skew default value and offset voltage VSHFTCompare
Adding and multiply, adjustment shows voltage Vcs ', and in display cycle output display voltage Vcs to display module 900.
In summary, produced by the coupled voltages circuit of the embodiment of the present invention can actively detect parasitic capacitance in the initial period
Coupled voltages（The coupled voltages of data wire or common voltage end points）, and according to the voltage of coupled voltages adjustment common voltage
Value, the situation flashed caused by avoid coupled voltages difference.Compared to prior art, the present invention need not carry out the dynamic of imprinting
Make, can economization processing time, increase unit production capacity.
The preferred embodiments of the present invention are the foregoing is only, are not intended to limit the invention, for the skill of this area
For art personnel, the present invention can have various modifications and variations.Within the spirit and principles of the invention, that is made any repaiies
Change, equivalent substitution, improvement etc., should be included in the scope of the protection.
Claims (12)
1. a kind of voltage calibration circuit, includes：
One coupled voltages circuit for detecting, for detecting a coupled voltages in an initial period and being produced according to the coupled voltages
One offset voltage；
One common potential circuit, in a display cycle according to the offset voltage adjust a common voltage and output described in
Common voltage is to a display module；And
One switch, includes one end and is coupled to the display module, and the other end is coupled to the coupled voltages circuit for detecting
Or the common voltage circuit, the switch are used for controlling the display module to be coupled to the common voltage circuit or the coupling
Close voltage detection circuit；
Wherein, the initial period is the period after the display module is started shooting and before one picture of display.
2. voltage calibration circuit as claimed in claim 1, it is characterised in that described switch will be described aobvious in the initial period
Show module couples to the coupled voltages circuit for detecting.
3. voltage calibration circuit as claimed in claim 1, it is characterised in that described switch will be described aobvious in the display cycle
Show module couples to the common voltage circuit.
4. voltage calibration circuit as claimed in claim 1, it is characterised in that the voltage calibration circuit also switchs comprising one,
A source electrode drive circuit and the coupled voltages circuit for detecting are coupled to, for controlling the display module to be coupled to the source
Pole drive circuit or the coupled voltages circuit for detecting.
5. voltage calibration circuit as claimed in claim 1, it is characterised in that the voltage calibration circuit is also set comprising a voltage
Order member, is coupled to the coupled voltages circuit for detecting and the common voltage circuit, for setting the common voltage
One skew default value.
6. a kind of liquid crystal display, includes：
One display module, include multiple stray capacitances；
One gate driving circuit, for producing multiple signals；
One source electrode drive circuit, the display module is coupled to, for exporting a display voltage to the display module；And
One voltage calibration circuit, includes：
One coupled voltages circuit for detecting, for detecting a coupled voltages in an initial period and being produced according to the coupled voltages
One offset voltage；
One common potential circuit, in a display cycle according to the offset voltage adjust a common voltage and output described in
Common voltage is to the display module；And
One switch, includes one end and is coupled to the display module, and the other end is coupled to the coupled voltages circuit for detecting
Or the common voltage circuit, the switch are used for controlling the display module to be coupled to the common voltage circuit or the coupling
Close voltage detection circuit；
Wherein, the initial period is the period after the display module is started shooting and before one picture of display.
7. a kind of voltage calibration circuit, includes：
One coupled voltages circuit for detecting, for detecting a coupled voltages in an initial period and being produced according to the coupled voltages
One offset voltage；
One source electrode drive circuit, for showing mould according to the display voltage of offset voltage output one to one in a display cycle
Block；And
One switch, includes one end and is coupled to the display module, and the other end is coupled to the coupled voltages circuit for detecting
Or an earth terminal, the switch are used for controlling the display module to be coupled to the coupled voltages circuit for detecting or the ground connection
End；
Wherein, the initial period is the period after the display module is started shooting and before one picture of display.
8. voltage calibration circuit as claimed in claim 7, it is characterised in that described switch will be described aobvious in the initial period
Show module couples to the coupled voltages circuit for detecting.
9. voltage calibration circuit as claimed in claim 7, it is characterised in that described switch will be described aobvious in the display cycle
Show module couples to the earth terminal.
10. voltage calibration circuit as claimed in claim 7, it is characterised in that the voltage calibration circuit also switchs comprising one,
The source electrode drive circuit and the coupled voltages circuit for detecting are coupled to, it is described for controlling the display module to be coupled to
Source electrode drive circuit or the coupled voltages circuit for detecting.
11. voltage calibration circuit as claimed in claim 7, it is characterised in that the voltage calibration circuit also includes a voltage
Setup unit, the coupled voltages circuit for detecting and the source electrode drive circuit are coupled to, for setting the display voltage
One skew default value.
12. a kind of liquid crystal display, includes：
One display module, include multiple stray capacitances；
One gate driving circuit, for producing multiple signals；And
One voltage calibration circuit, includes：
One coupled voltages circuit for detecting, for detecting a coupled voltages in an initial period and being produced according to the coupled voltages
One offset voltage；
One source electrode drive circuit, for showing voltage to the display mould according to offset voltage output one in a display cycle
Block；And
One switch, includes one end and is coupled to the display module, and the other end is coupled to the coupled voltages circuit for detecting
Or an earth terminal, the switch are used for controlling the display module to be coupled to the coupled voltages circuit for detecting or the ground connection
End；
Wherein, the initial period is the period after the display module is started shooting and before one picture of display.
Applications Claiming Priority (4)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| US201361869070P | 2013-08-23 | 2013-08-23 | |
| US61/869,070 | 2013-08-23 | ||
| TW103105928A TWI469128B (en) | 2013-08-23 | 2014-02-21 | Voltage calibration circuit and related liquid crystal display device |
| TW103105928 | 2014-02-21 |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN104424903A CN104424903A (en) | 2015-03-18 |
| CN104424903B true CN104424903B (en) | 2018-02-09 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201410102810.8A Active CN104424903B (en) | 2013-08-23 | 2014-03-19 | Voltage calibration circuit and liquid crystal display device thereof |
Country Status (3)
| Country | Link |
|---|---|
| KR (1) | KR101624314B1 (en) |
| CN (1) | CN104424903B (en) |
| TW (1) | TWI469128B (en) |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104809991A (en) * | 2015-04-03 | 2015-07-29 | 深圳市金立通信设备有限公司 | Method for determining reference voltage of display screen |
| TWI549113B (en) * | 2015-05-29 | 2016-09-11 | 鴻海精密工業股份有限公司 | Display device |
| JP6811748B2 (en) * | 2017-07-17 | 2021-01-13 | シトロニックス テクノロジー コーポレーション | Touch display drive circuit |
| US11847988B2 (en) | 2019-08-02 | 2023-12-19 | Sitronix Technology Corporation | Driving method for flicker suppression of display panel and driving circuit thereof |
| CN112837660A (en) * | 2021-01-07 | 2021-05-25 | Tcl华星光电技术有限公司 | Display panel driving method, display panel and display device |
Family Cites Families (13)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR100847823B1 (en) * | 2003-12-04 | 2008-07-23 | 엘지디스플레이 주식회사 | The liquid crystal display device |
| KR101157837B1 (en) * | 2004-12-30 | 2012-06-22 | 엘지디스플레이 주식회사 | Method And Circuit For Compensating Vcom |
| TWI327717B (en) * | 2005-11-22 | 2010-07-21 | Prime View Int Co Ltd | Method and circuit for common voltage setup and measurement |
| KR101225317B1 (en) * | 2005-12-28 | 2013-01-22 | 엘지디스플레이 주식회사 | Apparatus and method for driving LCD |
| TWI327304B (en) * | 2006-06-02 | 2010-07-11 | Chimei Innolux Corp | Liquid crystal display device and driving method of the same |
| JP2008089823A (en) * | 2006-09-29 | 2008-04-17 | Casio Comput Co Ltd | Drive circuit of matrix display device, display device, and method of driving matrix display device |
| TWI362641B (en) * | 2007-03-28 | 2012-04-21 | Chunghwa Picture Tubes Ltd | Liquid crystal display and display panel thereof |
| TWI410941B (en) * | 2009-03-24 | 2013-10-01 | Au Optronics Corp | Liquid crystal display capable of reducing image flicker and method for driving the same |
| KR101132051B1 (en) * | 2010-03-11 | 2012-04-02 | 삼성모바일디스플레이주식회사 | liquid crystal display |
| KR20120109805A (en) * | 2011-03-28 | 2012-10-09 | 삼성디스플레이 주식회사 | Method of driving display panel and display apparatus for performing the same |
| TWI421851B (en) * | 2011-05-17 | 2014-01-01 | Au Optronics Corp | Liquid crystal display having common voltage compensation mechanism and common voltage compensation method |
| KR101853022B1 (en) * | 2011-07-07 | 2018-04-30 | 엘지디스플레이 주식회사 | Liquid crystal display and method for adjusting common voltage thereof |
| CN103065594B (en) * | 2012-12-14 | 2017-04-12 | 深圳市华星光电技术有限公司 | Data driving circuit, liquid crystal display device and driving method |
-
2014
- 2014-02-21 TW TW103105928A patent/TWI469128B/en active
- 2014-03-19 CN CN201410102810.8A patent/CN104424903B/en active Active
- 2014-05-26 KR KR1020140063030A patent/KR101624314B1/en active IP Right Grant
Also Published As
| Publication number | Publication date |
|---|---|
| TWI469128B (en) | 2015-01-11 |
| KR20150022644A (en) | 2015-03-04 |
| KR101624314B1 (en) | 2016-06-07 |
| TW201508728A (en) | 2015-03-01 |
| CN104424903A (en) | 2015-03-18 |
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