CN104424903A - 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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- CN104424903A CN104424903A CN201410102810.8A CN201410102810A CN104424903A CN 104424903 A CN104424903 A CN 104424903A CN 201410102810 A CN201410102810 A CN 201410102810A CN 104424903 A CN104424903 A CN 104424903A
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- 239000004973 liquid crystal related substance Substances 0.000 title claims abstract description 79
- 230000008878 coupling Effects 0.000 abstract description 8
- 238000010168 coupling process Methods 0.000 abstract description 8
- 238000005859 coupling reaction Methods 0.000 abstract description 8
- 239000003990 capacitor Substances 0.000 abstract description 5
- 238000000034 method Methods 0.000 abstract description 4
- 230000008569 process Effects 0.000 abstract description 3
- 238000001514 detection method Methods 0.000 abstract 2
- 230000003071 parasitic effect Effects 0.000 abstract 1
- 238000010586 diagram Methods 0.000 description 19
- 230000008901 benefit Effects 0.000 description 6
- 239000010409 thin film Substances 0.000 description 6
- 230000009471 action Effects 0.000 description 4
- 238000004519 manufacturing process Methods 0.000 description 4
- 230000008859 change Effects 0.000 description 3
- 230000004308 accommodation Effects 0.000 description 2
- 230000005540 biological transmission Effects 0.000 description 1
- 238000004891 communication 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
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- 230000000630 rising effect Effects 0.000 description 1
- 238000004088 simulation 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
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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
- G09G3/3648—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
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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
- 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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- 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, particularly relate to a kind of voltage calibration circuit and the associated liquid crystal display device thereof that initiatively can detect a coupled voltages.
Background technology
Liquid crystal display (Liquid Crystal Display Device; LCD Device) have that external form is frivolous, the advantage such as power saving and Low emissivity, be therefore widely used on the electronic products such as computer screen, mobile phone, PDA(Personal Digital Assistant), flat-surface television and other communication/amusement equipment.The principle of work of liquid crystal display utilizes the voltage difference changing liquid crystal layer two ends to change the ordered state of the liquid crystal molecule in liquid crystal layer, change the light transmission of liquid crystal layer according to this, then the light source coordinating backlight module to provide is with show image.
Thin film transistor (TFT) (Thin Film Transistor, TFT) liquid crystal display is display device the most universal at present, no matter the function of display module or driving chip and framework are all gradually ripe.Please refer to Figure 1A, Figure 1A is the schematic diagram of a tft liquid crystal display device 10 in prior art.Tft liquid crystal display device 10 comprises a display module 120, one source pole driver (source driver) 160 and a gate drivers (gate driver) 180.Display module 120 is provided with data line (data line) D1 ~ Dm parallel to each other, gate line parallel to each other (gate line) G1 ~ Gn and display unit P11 ~ Pmn.Data line D1 ~ Dm and gate lines G 1 ~ Gn setting interlaced with each other, display unit P11 ~ Pmn is then located at the confluce of corresponding data line and gate line respectively.Source electrode driver 160 and gate drivers 180 produce drive singal and signal respectively.Each display unit on display module 120 all includes thin film transistor switch 100 and a liquid crystal capacitance 140, one end of each liquid crystal capacitance is coupled to a corresponding data line by a corresponding thin film transistor switch, and the other end is then coupled to a common voltage Vcom.When receiving signal that gate drivers 180 produces and opening the thin film transistor switch of a display unit, the liquid crystal capacitance of this display unit can be electrically connected to its corresponding data line to receive the drive singal transmitted from source electrode driver 160, therefore display unit can control the degree of rotation of liquid crystal molecule according to the electric charge of its liquid crystal capacitance internal memory, to show the image of different GTG.
A stray capacitance 111 is all had in each display unit.When the moment that gate lines G 1 ~ Gn opens or closes, the change of voltage can have influence on the voltage of display unit P11 ~ Pmn via stray capacitance 111.When gate lines G 1 ~ Gn opens, therefore the voltage of display unit P11 ~ Pmn can be charged to correct voltage.When gate lines G 1 ~ Gn closes, stray capacitance 111 can produce a downward coupled voltages on display unit P11 ~ Pmn, because source electrode driver 160 does not recharge, and make the generating positive and negative voltage of display unit P11 ~ Pmn be symmetrical in Vcom, wherein Vcom is that a fixed voltage exports.So make the degree of rotation of the positive and negative liquid crystal of same display data identical and show same gray level.But the drift due to LCD processing procedure can cause the little bit different of Different L CD panel stray capacitance 111, this LCD that some is differed greatly is after gate lines G 1 ~ Gm closes, generating positive and negative voltage after stray capacitance 111 couples of display unit P11 ~ Pmm are coupled downwards can be asymmetric with Vcom, causes the difference of display GTG and causes LCD flicker (flicker) phenomenon.
Please refer to Figure 1B, Figure 1B is an oscillogram of each display unit in Figure 1A.In fig. ib, when gate line (as: G1) by a negative potential VGL(as :-12V) rise to a positive potential VGH(as: time 15V), represent gate line open, wherein GND is ground connection level.Source electrode driver 160 is filled with a display voltage to storage capacitors 140.When gate line is closed, grid voltage by positive potential VGH(as: 15V) be down to negative potential VGL(as :-12V).Now, because of the existence of stray capacitance 111, make storage capacitors 140 be coupled a magnitude of voltage (usually about about 1V), the identical data magnitude of voltage after this coupling can be symmetrical in a LCD co-polar voltage Vcom.When stray capacitance 111 difference of Different L CD panel is excessive, the display unit P11 ~ Pmm after coupling can be asymmetric with Vcom and cause scintillation.
In order to solve this scintillation, prior art is by there being one group of non-voltile memory (NVM), and it goes to adjust common voltage according to the degree that every sheet liquid crystal display device module glimmers.But, this action one imprinting flow process that made modular manufacture many.
Summary of the invention
Therefore, namely fundamental purpose of the present invention is to provide a kind of liquid crystal display, can initiatively detect a coupled voltages, need not an imprinting flow process.
The present invention discloses a kind of voltage calibration circuit.Described voltage calibration circuit includes a coupled voltages circuit for detecting and a common potential circuit.Described coupled voltages circuit for detecting is used for detecting a coupled voltages in an initial period and producing a bucking voltage according to described coupled voltages.Described common voltage circuit, is used for adjusting a common voltage according to described bucking voltage in a display cycle and exporting described common voltage to display module.
The present invention also discloses a kind of liquid crystal display.Described liquid crystal display includes a display module, a gate driver circuit, one source pole driving circuit and a voltage calibration circuit.Described display module includes multiple stray capacitance.Described gate driver circuit, is used for producing multiple signal.Described source electrode drive circuit, is coupled to described display module, is used for output one to show voltage to described display module.Described voltage calibration circuit includes a coupled voltages circuit for detecting and a common potential circuit.Described coupled voltages circuit for detecting is used for detecting a coupled voltages in an initial period and producing a bucking voltage according to described coupled voltages.Described common voltage circuit, is used for adjusting a common voltage according to described bucking voltage in a display cycle and exporting described common voltage to display module.
The present invention also discloses a kind of voltage calibration circuit.Described voltage calibration circuit includes a coupled voltages circuit for detecting and one source pole driving circuit.Described coupled voltages circuit for detecting, is used for detecting a coupled voltages in an initial period and producing a bucking voltage according to described coupled voltages.Described source electrode drive circuit, is used for exporting display voltage to one display module in a display cycle according to described bucking voltage.
The present invention also discloses a kind of liquid crystal display.Described liquid crystal display includes a display module, a gate driver circuit and a voltage calibration circuit.Described display module includes multiple stray capacitance.Described gate driver circuit, is used for producing multiple signal.Described voltage calibration circuit includes a coupled voltages circuit for detecting and one source pole driving circuit.Described coupled voltages circuit for detecting, is used for detecting a coupled voltages in an initial period and producing a bucking voltage according to described coupled voltages.Described source electrode drive circuit, is used for exporting display voltage to one display module in a display cycle according to described bucking voltage.
Accompanying drawing explanation
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. 2 A is the theory diagram of the embodiment of the present invention one liquid crystal display.
Fig. 2 B is an oscillogram of the embodiment of the present invention one display unit.
Fig. 2 C is the example embodiment of coupled voltages circuit for detecting 260 of the present invention.
Fig. 3 is the theory diagram of the embodiment of the present invention one liquid crystal display.
Fig. 4 is the theory diagram of the embodiment of the present invention one liquid crystal display.
Fig. 5 is the theory diagram of the embodiment of the present invention one liquid crystal display.
Fig. 6 A is the theory diagram of the embodiment of the present invention one liquid crystal display.
Fig. 6 B is an oscillogram of the embodiment of the present invention one display unit.
Fig. 7 is the theory diagram of the embodiment of the present invention one liquid crystal display.
Fig. 8 is the theory diagram of the embodiment of the present invention one liquid crystal display.
Fig. 9 figure is the theory diagram of the embodiment of the present invention one liquid crystal display.
Wherein, description of reference numerals is as follows:
10 tft liquid crystal display devices
120,200,300,400,500 display modules
160 source electrode drivers
180 gate drivers
D1 ~ Dm data line
G1 ~ Gn gate line
P11 ~ Pmn display unit
140 liquid crystal capacitances
100 thin film transistor switch
Vcom common voltage
250,350,450,550,650,750,850, voltage calibration circuit
950
20,30,40,50 liquid crystal displays
220,320,420,520 source electrode drive circuits
240,340,440,540 gate driver circuits
260,360,460,560 coupled voltages circuit for detecting
280,380,480,580 common voltage circuit
290,390,490,590,591 switches
262 analog-digital converters
264 look-up tables
266 digital analog converters
V
fD, V
fD_sourcecoupled voltages
T
vCOMcommon voltage end points
V
sHFTbucking voltage
310,510 voltage sets unit
Vcs, Vcs ' show voltage
Embodiment
Please refer to Fig. 2 A, Fig. 2 A is the schematic diagram of the embodiment of the present invention one liquid crystal display 20.Liquid crystal display 20 includes a display module 200, one source pole driving circuit 220, gate driver circuit 240 and a voltage calibration circuit 250.Voltage calibration circuit 250 comprises the common potential circuit 280 of a coupled voltages circuit for detecting 260, one and a switch 290.The framework of liquid crystal display 20 is similar to the tft liquid crystal display device 10 of Fig. 1, therefore exists together mutually and repeat no more.Gate driver circuit 240, is used for producing multiple signal, with a plurality of gate lines of opening/closing in proper order.Source electrode drive circuit 220 is used for (that is, rising to a positive potential by a negative potential) when gate line is opened, and inputs the multiple storage capacitors of multiple display voltage to display module 200.Display module 200 is when drop edge (that is, a plurality of gate lines are closed) of multiple signal, and the stray capacitance (111 of Figure 1A) of display module 200 can produce a coupled voltages V
fD, a common voltage end point T of drop-down display module 200
vCOMa common voltage Vcom.Coupled voltages circuit for detecting 260, is coupled to the common voltage end points T of display module 200 by switch 290
vCOM, be used in an initial period of liquid crystal display 20, detecting coupled voltages V
fDand according to coupled voltages V
fDproduce a bucking voltage V
sHFT.Wherein, the initial period of liquid crystal display 20 is after liquid crystal display 20 is started shooting, and during one before display frame.Common voltage circuit 280 is coupled to the common voltage end points T of display module 200 by switch 290
vCOM, be used in liquid crystal display 20 1 display cycle, according to bucking voltage V
sHFT, adjustment common voltage Vcom and output common voltage Vcom is to display module 200.Wherein, during the display cycle of liquid crystal display 20 is of liquid crystal display 20 display frame.Switch 290 is coupled to display module 200, coupled voltages circuit for detecting 260 and common voltage circuit 280, is used for controlling display module 200 and is coupled to common voltage circuit 280 or coupled voltages circuit for detecting 260.Therefore, the liquid crystal display 20 of the embodiment of the present invention can in the initial period of liquid crystal display 20, the coupled voltages V that detecting stray capacitance produces
fD, and active accommodation common voltage Vcom, to avoid the situation of glimmering, and the action of imprinting need not be carried out, with economization processing time, increase unit production capacity.
Please also refer to Fig. 2 B, Fig. 2 B is an oscillogram of the embodiment of the present invention one display unit.In detail, in the initial period, common voltage Vcom first gives tacit consent to an initial voltage value (such as: 0V).When gate driver circuit 240 closes gate line (that is, being down to negative potential VGL by positive potential VGH), switch 290 controls the common voltage end points T of display module 200
vCOMbe coupled to coupled voltages circuit for detecting 260.Coupled voltages circuit for detecting 260 detects coupled voltages V
fDand according to coupled voltages V
fDproduce bucking voltage V
sHFT.Preferably, coupled voltages V
fDcan be stored in a buffer (not being illustrated in Fig. 2) of coupled voltages circuit for detecting 260.In the display cycle, switch 290 controls the common voltage end points T of display module 200
vCOMbe coupled to common voltage circuit 280, common voltage circuit 280 is according to bucking voltage V
sHFTadjustment common voltage Vcom, and export common voltage Vcom to display module 200.For example, be 0V when common voltage Vcom is initial.When gate line is closed, coupled voltages circuit for detecting 260 detects coupled voltages V
fD=-0.6V, and according to coupled voltages V
fDproduce bucking voltage V
sHFT=-1.2V.In the display cycle, common voltage circuit 280 is according to bucking voltage V
sHFTcommon voltage Vcom is adjusted to-1.2V downwards from 0V, and the common voltage Vcom exporting-1.2V is to display module 200.
Please also refer to Fig. 2 C, Fig. 2 C is the example embodiment of coupled voltages circuit for detecting 260 of the present invention.Be not limited according to this.Coupled voltages circuit for detecting 260 includes analog-digital converter 262, look-up table 264 and a digital analog converter 266.Analog-digital converter 262 is used for receiving the coupled voltages V simulated
fD, and by coupled voltages V
fDbe converted to a digital value D
fD.Look-up table 264 is according to digital value D
fD, export bucking voltage V
sHFTanswer the digital value D of described correspondence
sHFT.Digital analog converter 266 is used for according to the digital value D of bucking voltage
sHFTbe converted to the bucking voltage V of simulation
sHFT.
In embodiments of the present invention, voltage calibration circuit also can comprise a voltage sets unit.Please refer to Fig. 3, Fig. 3 is the schematic diagram of another embodiment of the present invention liquid crystal display 30.In figure 3, liquid crystal display 30 includes a display module 300, one source pole driving circuit 320, gate driver circuit 340 and a voltage calibration circuit 350.Voltage calibration circuit 350 comprises common potential circuit 380, switch 390 of a coupled voltages circuit for detecting 360, one and a voltage sets unit 310.Embodiment difference shown in the present embodiment and Fig. 2 A is voltage sets unit 310, is coupled to coupled voltages circuit for detecting 360 and common voltage circuit 380, and be used for setting common voltage Vcom one offsets default value.When gate driver circuit 240 closes gate line, switch 390 controls the common voltage end points T of display module 300
vCOMbe coupled to coupled voltages circuit for detecting 360.Coupled voltages circuit for detecting 360 detects coupled voltages V
fD, and by with coupled voltages V
fDa relational expression, or adopt look-up table mode, produce bucking voltage V
sHFT.In the display cycle, switch 390 controls the common voltage end points T of display module 300
vCOMbe coupled to common voltage circuit 380, common voltage circuit 380 is according to the skew default value of common voltage Vcom and bucking voltage V
sHFTrelatively add and take advantage of, adjustment common voltage Vcom also exports the common voltage Vcom after adjusting to display module 300.For example, be 0V when common voltage Vcom is initial.When gate line is closed, coupled voltages circuit for detecting 360 detects coupled voltages V
fD=-0.6V, the skew default value that voltage sets unit 310 sets common voltage Vcom is-1V.Therefore, coupled voltages circuit for detecting 360 is according to coupled voltages V
fDproduce bucking voltage V
sHFT=-0.2V.In the display cycle, common voltage circuit 380 compares to add takes advantage of bucking voltage V
sHFTand the skew default value (that is ,-0.2V+-1V) of common voltage Vcom, common voltage Vcom is adjusted to-1.2V downwards from 0V, and the common voltage Vcom exporting-1.2V is to display module 300.
In other embodiments of the present invention, coupled voltages circuit for detecting is except being coupled to the common voltage end points T of display module 200
vCOM, detecting coupled voltages V
fDoutward, coupled voltages circuit for detecting also can be coupled to source electrode drive circuit, the coupled voltages of detecting data line, or is coupled to source electrode drive circuit and common voltage end points T simultaneously
vCOM.Please refer to Fig. 4, Fig. 4 is the schematic diagram of another embodiment of the present invention liquid crystal display 40.In the diagram, liquid crystal display 40 includes a display module 400, one source pole driving circuit 420, gate driver circuit 440 and a voltage calibration circuit 450.Voltage calibration circuit 450 includes the common potential circuit 480 of a coupled voltages circuit for detecting 460, one and a switch 490.Display device 40 is different from liquid crystal display 20 be in, the relation that couples of switch 490 is different from switch 290.Switch 490 is coupled to display module 400, source electrode drive circuit 420 and coupled voltages circuit for detecting 460, is used for controlling display module 400 and is coupled to source electrode drive circuit 420 or coupled voltages circuit for detecting 460.When gate driver circuit 440 closes gate line, switch 490 controls the common voltage end points T of display module 400
vCOMbe coupled to coupled voltages circuit for detecting 460, the coupled voltages V of coupled voltages circuit for detecting 460 detecting data line
fD_sourceand according to coupled voltages V
fD_sourceproduce bucking voltage V
sHFT.Preferably, the coupled voltages V of data line
fD_sourceapproximately with common voltage end point T
vCOMcoupled voltages V
fDidentical.In the display cycle, switch 490 controls display module 400 and is coupled to source electrode drive circuit 420, and common voltage circuit 480 is according to bucking voltage V
sHFTadjustment common voltage Vcom, and export common voltage Vcom to display module 400.
Please refer to Fig. 5, Fig. 5 is the schematic diagram of another embodiment of the present invention liquid crystal display 50.Liquid crystal display 50 includes a display module 500, one source pole driving circuit 520, gate driver circuit 540 and a voltage calibration circuit 550.Voltage calibration circuit 550 includes a coupled voltages circuit for detecting 560, common potential circuit 580, voltage sets unit 510,1 first switch 590 and a second switch 591.Voltage calibration circuit 550 is in conjunction with voltage calibration circuit 350 and voltage calibration circuit 450, and therefore basic framework is roughly the same, and unique difference is in and includes second switch 591 in voltage calibration circuit more than 550.First switch 590 is coupled to display module 500, source electrode drive circuit 520 and coupled voltages circuit for detecting 560, is used for controlling display module 500 and is 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, is used for controlling display module 500 and is coupled to common voltage circuit 580 or coupled voltages circuit for detecting 560.When gate driver circuit 540 closes gate line, the first switch 590 controls display module 500 and is coupled to coupled voltages circuit for detecting 560, and second switch 591 controls the common voltage end points T of display module 500
vCOMbe coupled to circuit for detecting 560.That is, coupled voltages circuit for detecting 560 detects the coupled voltages V of the data line of display module 500 simultaneously
fD_sourceand common voltage end points T
vCOMcoupled voltages V
fD, and according to coupled voltages V
fDand V
fD_source, produce bucking voltage V
sHFT.In the display cycle, the first switch 590 controls display module 500 and is coupled to source electrode drive circuit 520, and second switch 591 controls the common voltage end points T of display module 500
vCOMbe coupled to common voltage circuit 580, common voltage circuit 580 is according to the skew default value of common voltage Vcom and bucking voltage V
sHFTrelatively add and take advantage of, adjustment common voltage Vcom, and export common voltage Vcom to display module 500.
Please refer to Fig. 6 A, Fig. 6 A is the schematic diagram of the embodiment of the present invention one liquid crystal display 60.Liquid crystal display 60 includes display module 600, gate driver circuit 640 and a voltage calibration circuit 650.Voltage calibration circuit 650 includes one source pole driving circuit 620, coupled voltages circuit for detecting 660 and a switch 690.The framework of liquid crystal display 60 is similar to the tft liquid crystal display device 10 of Fig. 1, therefore exists together mutually and repeat no more.Gate driver circuit 640, is used for producing multiple signal, with a plurality of gate lines of opening/closing.Display module 600 is when drop edge (that is, a plurality of gate lines are closed) of multiple signal, and the stray capacitance of display module 600 can produce a coupled voltages V
fD.Switch 690 is coupled to coupled voltages circuit for detecting 660, is used for controlling display module 600 and is coupled to an earth terminal 680 or coupled voltages circuit for detecting 660.As a common voltage end point T of display module 600
vCOMwhen being coupled to earth terminal 680, common voltage Vcom is fixed as 0V.Coupled voltages circuit for detecting 660 is coupled to the common voltage end points T of display module 600 by switch 690
vCOM.Coupled voltages circuit for detecting 660 is used in the initial period detecting coupled voltages V of liquid crystal display 60
fDand according to coupled voltages V
fDproduce a bucking voltage V
sHFT.Wherein, the initial period of liquid crystal display 60 is after liquid crystal display 60 is started shooting, and during one before display frame.Source electrode drive circuit 620 be used in the initial period export one do not adjust display voltage Vcs ' to display module 600 and in a display cycle according to bucking voltage V
sHFTexport a display voltage Vcs to display module 600.Therefore, the liquid crystal display 60 of the embodiment of the present invention can in the initial period of liquid crystal display 60, the coupled voltages V that detecting stray capacitance produces
fD, and active accommodation display voltage, to avoid the situation of glimmering, and the action of imprinting need not be carried out, with economization processing time, increase unit production capacity.
Please also refer to Fig. 6 B, Fig. 6 B is an oscillogram of the embodiment of the present invention one display unit.In an initial period, common voltage Vcom first gives tacit consent to an initial voltage value (such as: 0V), and source electrode driver 620 exports and do not adjust the multiple storage capacitors of display voltage Vcs ' to display module 600.When gate driver circuit 640 closes gate line (that is, being down to negative potential VGL by positive potential VGH), switch 690 controls the common voltage end points T of display module 600
vCOMbe coupled to coupled voltages circuit for detecting 660.Coupled voltages circuit for detecting 660 detects coupled voltages V
fDand according to coupled voltages V
fDproduce bucking voltage V
sHFT.Preferably, coupled voltages V
fDcan be stored in a buffer (not being illustrated in Fig. 6 A) of coupled voltages circuit for detecting 660.In the display cycle, switch 690 controls the common voltage end points T of display module 600
vCOMbe coupled to earth point 680, make common voltage end points T
vCOMcommon voltage Vcom be fixed as 0V.Coupled voltages circuit for detecting 660 exports bucking voltage V
sHFTto source electrode drive circuit 620.Source electrode drive circuit 620 is according to bucking voltage V
sHFTin display cycle output display voltage Vcs to display module.
In embodiments of the present invention, voltage calibration circuit also can comprise a voltage sets unit.Please refer to Fig. 7, Fig. 7 is the schematic diagram of another embodiment of the present invention liquid crystal display 70.In the figure 7, liquid crystal display 70 includes display module 700, gate driver circuit 740 and a voltage calibration circuit 750.Voltage calibration circuit 750 includes one source pole driving circuit 720, coupled voltages circuit for detecting 760, switch 790 and a voltage sets unit 710.Basic framework and the display device 60 of display device 70 are similar, difference be in, voltage sets unit 710 is coupled to coupled voltages circuit for detecting 760 and source electrode drive circuit 720, be used for set and display voltage one skew default value.When gate driver circuit 740 closes gate line, switch 790 controls the common voltage end points T of display module 700
vCOMbe coupled to coupled voltages circuit for detecting 760.Coupled voltages circuit for detecting 760 detects coupled voltages V
fD, and according to coupled voltages V
fDproduce bucking voltage V
sHFT.In the display cycle, switch 790 controls the common voltage end points T of display module 700
vCOMbe coupled to earth terminal 780, source electrode drive circuit 720 compares to add takes advantage of described skew default value and bucking voltage V
sHFT, adjustment display voltage Vcs ' also exports the display voltage Vcs after adjusting to display module 700 in the display cycle.
In other embodiments of the present invention, coupled voltages circuit for detecting is except being coupled to the common voltage end points T of display module 600,700
vCOM, detecting coupled voltages V
fDoutward, coupled voltages circuit for detecting also can be coupled to source electrode drive circuit, with the coupled voltages of detecting data line, or is coupled to source electrode drive circuit and common voltage end points T simultaneously
vCOM.Please refer to Fig. 8, Fig. 8 is the schematic diagram of another embodiment of the present invention liquid crystal display 80.In fig. 8, liquid crystal display 80 includes display module 800, gate driver circuit 840 and a voltage calibration circuit 850.Voltage calibration circuit 850 includes one source pole driving circuit 820, coupled voltages circuit for detecting 860 and a switch 890.Liquid crystal display 80 difference be in, the relation that couples of switch 890 is different from switch 690, and display module 800 is directly coupled to an earth terminal 880.Switch 890 is coupled to display module 800, source electrode drive circuit 820 and coupled voltages circuit for detecting 860, is used for controlling display module 800 and is coupled to source electrode drive circuit 820 or coupled voltages circuit for detecting 860.When gate driver circuit 840 closes gate line, switch 890 controls display module 800 and is coupled to coupled voltages circuit for detecting 860.Then, the coupled voltages V of coupled voltages circuit for detecting 860 detecting data line
fD_sourceand according to coupled voltages V
fD_sourceproduce bucking voltage V
sHFT.Preferably, the coupled voltages V of data line
fD_sourceapproximately with common voltage end point T
vCOMcoupled voltages V
fDidentical.In the display cycle, switch 890 controls display module 800 and is coupled to source electrode drive circuit 820, and source electrode drive circuit 820 is according to bucking voltage V
sHFTadjustment display voltage Vcs ', and in display cycle output display voltage Vcs to display module 800.
Please refer to Fig. 9, Fig. 9 is the schematic diagram of another embodiment of the present invention liquid crystal display 90.Liquid crystal display 90 includes display module 900, gate driver circuit 940 and a voltage calibration circuit 950.Voltage calibration circuit 950 includes one source pole driving circuit 920, coupled voltages circuit for detecting 960, earth terminal 980, voltage sets unit 910,1 first switch 990 and a second switch 991.Liquid crystal display 90 is in conjunction with liquid crystal display 70 and liquid crystal display 80, and therefore basic framework is roughly the same, and unique difference is in and 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, is used for controlling display module 900 and is coupled to source electrode drive circuit 920 or coupled voltages circuit for detecting 960.Second switch 991 is coupled to display module 900, earth terminal 980 and coupled voltages circuit for detecting 960, is used for controlling the common voltage end points T of display module 900
vCOMbe coupled to an earth terminal 980 or coupled voltages circuit for detecting 960.When gate driver circuit 940 closes gate line, the first switch 990 controls display module 900 and is coupled to coupled voltages circuit for detecting 960, and second switch 991 controls the common voltage end points T of display module 900
vCOMbe coupled to circuit for detecting 960.That is, coupled voltages circuit for detecting 960 detects the coupled voltages V of the data line of display module 900 simultaneously
fD_sourceand common voltage end points T
vCOMcoupled voltages V
fD, and according to coupled voltages V
fDand coupled voltages V
fD_source, produce bucking voltage V
sHFT.In the display cycle, the first switch 990 controls display module 900 and is coupled to source electrode drive circuit 920, and second switch 991 controls the common voltage end points T of display module 900
vCOMbe coupled to earth terminal 980, make common voltage Vcom be fixed as 0V.Source electrode driver 920 is according to skew default value and bucking voltage V
sHFTrelatively add and take advantage of, adjustment display voltage Vcs ', and in display cycle output display voltage Vcs to display module 900.
In sum, the coupled voltages circuit of the embodiment of the present invention can initiatively detect in the initial period coupled voltages (coupled voltages of data line or common voltage end points) that stray capacitance produces, and adjust the magnitude of voltage of common voltage according to coupled voltages, the situation of the flicker caused to avoid coupled voltages difference.Compared to prior art, the present invention need not carry out the action of imprinting, can economization processing time, increases unit production capacity.
The foregoing is only the preferred embodiments of the present invention, be not limited to the present invention, for a person skilled in the art, the present invention can have various modifications and variations.Within the spirit and principles in the present invention all, any amendment done, equivalent replacement, improvement etc., all should be included within protection scope of the present invention.
Claims (16)
1. a voltage calibration circuit, includes:
One coupled voltages circuit for detecting, is used for detecting a coupled voltages in an initial period and producing a bucking voltage according to described coupled voltages; And
One common potential circuit, is used for adjusting a common voltage according to described bucking voltage in a display cycle and exporting described common voltage to display module.
2. voltage calibration circuit as claimed in claim 1, it is characterized in that, described voltage calibration circuit also comprises a switch, be coupled to described common voltage circuit and described coupled voltages circuit for detecting, be used for controlling described display module and be coupled to described common voltage circuit or described coupled voltages circuit for detecting.
3. voltage calibration circuit as claimed in claim 2, it is characterized in that, described display module is coupled to described coupled voltages circuit for detecting in the described initial period by described switch.
4. voltage calibration circuit as claimed in claim 2, it is characterized in that, described display module is coupled to described common voltage circuit in the described display cycle by described switch.
5. voltage calibration circuit as claimed in claim 1, it is characterized in that, described voltage calibration circuit also comprises a switch, be coupled to one source pole driving circuit and described coupled voltages circuit for detecting, be used for controlling described display module and be coupled to described source electrode drive circuit or described coupled voltages circuit for detecting.
6. voltage calibration circuit as claimed in claim 1, it is characterized in that, described voltage calibration circuit also comprises:
One first switch, is coupled to one source pole driving circuit and described coupled voltages circuit for detecting, is used for controlling described display module and is coupled to described source electrode drive circuit or described coupled voltages circuit for detecting; And
One second switch, is coupled to described common voltage circuit and described coupled voltages circuit for detecting, is used for controlling described display module and is coupled to described common voltage circuit or described coupled voltages circuit for detecting.
7. voltage calibration circuit as claimed in claim 1, it is characterized in that, described voltage calibration circuit also comprises a voltage sets unit, is coupled to described coupled voltages circuit for detecting and described common voltage circuit, and be used for setting described common voltage one offsets default value.
8. a liquid crystal display, includes:
One display module, includes multiple stray capacitance;
One gate driver circuit, is used for producing multiple signal;
One source pole driving circuit, is coupled to described display module, is used for output one to show voltage to described display module; And
One voltage calibration circuit, includes:
One coupled voltages circuit for detecting, is used for detecting a coupled voltages in an initial period and producing a bucking voltage according to described coupled voltages; And
One common potential circuit, is used for adjusting a common voltage according to described bucking voltage in a display cycle and exporting described common voltage to described display module.
9. a voltage calibration circuit, includes:
One coupled voltages circuit for detecting, is used for detecting a coupled voltages in an initial period and producing a bucking voltage according to described coupled voltages; And
One source pole driving circuit, is used for exporting display voltage to one display module in a display cycle according to described bucking voltage.
10. voltage calibration circuit as claimed in claim 9, it is characterized in that, described voltage calibration circuit also comprises a switch, is coupled to described coupled voltages circuit for detecting, is used for controlling described display module and is coupled to an earth terminal or described coupled voltages circuit for detecting.
11. voltage calibration circuit as claimed in claim 10, it is characterized in that, described display module is coupled to described coupled voltages circuit for detecting in the described initial period by described switch.
12. voltage calibration circuit as claimed in claim 10, it is characterized in that, described display module is coupled to described earth terminal in the described display cycle by described switch.
13. voltage calibration circuit as claimed in claim 9, it is characterized in that, described voltage calibration circuit also comprises a switch, be coupled to described source electrode drive circuit and described coupled voltages circuit for detecting, be used for controlling described display module and be coupled to described source electrode drive circuit or described coupled voltages circuit for detecting.
14. voltage calibration circuit as claimed in claim 9, it is characterized in that, described voltage calibration circuit also comprises:
One first switch, is coupled to described source electrode drive circuit and described coupled voltages circuit for detecting, is used for controlling described display module and is coupled to described source electrode drive circuit or described coupled voltages circuit for detecting; And
One second switch, is coupled to described coupled voltages circuit for detecting, is used for controlling described display module and is coupled to an earth terminal or described coupled voltages circuit for detecting.
15. voltage calibration circuit as claimed in claim 9, it is characterized in that, described voltage calibration circuit also comprises a voltage sets unit, is coupled to described coupled voltages circuit for detecting and described source electrode drive circuit, and be used for setting described display voltage one offsets default value.
16. 1 kinds of liquid crystal displays, include:
One display module, includes multiple stray capacitance;
One gate driver circuit, is used for producing multiple signal; And
One voltage calibration circuit, includes:
One coupled voltages circuit for detecting, is used for detecting a coupled voltages in an initial period and producing a bucking voltage according to described coupled voltages; And
One source pole driving circuit, is used for exporting a display voltage to described display module in a display cycle according to described bucking voltage.
Applications Claiming Priority (4)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| US201361869070P | 2013-08-23 | 2013-08-23 | |
| US61/869,070 | 2013-08-23 | ||
| TW103105928 | 2014-02-21 | ||
| TW103105928A TWI469128B (en) | 2013-08-23 | 2014-02-21 | Voltage calibration circuit and related liquid crystal display device |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN104424903A true CN104424903A (en) | 2015-03-18 |
| CN104424903B 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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| 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 |
| CN109271054A (en) * | 2017-07-17 | 2019-01-25 | 矽创电子股份有限公司 | Touch-control display driver circuit |
| CN112309344A (en) * | 2019-08-02 | 2021-02-02 | 矽创电子股份有限公司 | Driving method for suppressing flicker 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 |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| TWI549113B (en) * | 2015-05-29 | 2016-09-11 | 鴻海精密工業股份有限公司 | Display device |
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Also Published As
| Publication number | Publication date |
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| TWI469128B (en) | 2015-01-11 |
| KR20150022644A (en) | 2015-03-04 |
| TW201508728A (en) | 2015-03-01 |
| CN104424903B (en) | 2018-02-09 |
| KR101624314B1 (en) | 2016-06-07 |
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