CN102645771A - Vcom adjusting method and device for liquid crystal panel - Google Patents
Vcom adjusting method and device for liquid crystal panel Download PDFInfo
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- CN102645771A CN102645771A CN2012101066721A CN201210106672A CN102645771A CN 102645771 A CN102645771 A CN 102645771A CN 2012101066721 A CN2012101066721 A CN 2012101066721A CN 201210106672 A CN201210106672 A CN 201210106672A CN 102645771 A CN102645771 A CN 102645771A
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- liquid crystal
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- crystal panel
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Abstract
The invention relates to a Vcom adjusting method and device for a liquid crystal panel. The Vcom adjusting method for the liquid crystal panel comprises the following steps of: 1, partitioning the liquid crystal panel into a plurality of regions, wherein each region corresponds to a logical operation module; 2, supplying initial data by using a time sequence controller and the logical operation modules in a matched way; 3, making a corresponding logical operation module obtain the liquid crystal capacitance charging voltage of a corresponding region; 4, performing logical processing through the logical operation modules to obtain a positive voltage and a negative voltage; 5, transmitting the positive voltage and the negative voltage to a power supply module; and 6, calculating a common-electrode voltage Vcom needed by the liquid crystal panel by using the power supply module. According to the method and the device, Vcom can be adjusted to an optimal state under the condition that an LCD (Liquid Crystal Display) is in different environments.
Description
Technical field
The present invention relates to the liquid crystal image technical field, particularly a kind of Vcom method of adjustment and device of liquid crystal panel.
Background technology
TFT (Thin Film Transistor)---TFT; Be meant that each the liquid crystal pixel point on the LCD all is to be driven by the thin film transistor (TFT) that is integrated in thereafter; Thereby can accomplish high-speed high brightness high-contrast display screen information, common TFT-LCD (Thin Film Transistor-LCD) is a kind of of most LCDs.Please refer to Fig. 1, be the equivalent electrical circuit of full wafer TFT panel, wherein each TFT is parallelly connected with Cs (MM CAP) with Clc (liquid crystal capacitance), represents the point of a demonstration.And a basic display unit Pixel then needs three points that show like this, represents the RGB three primary colors respectively.When panel was worked, scanner driver can be exported waveform as shown in the figure, and the TFT with each row opens in regular turn, let the whole data driver of arranging simultaneously with the display dot of a full line well, was charged to required separately voltage, showed different gray levels.When this delegation was charged, scanner driver was just closed voltage, and the scanner driver of next line is just opened voltage then, was discharged and recharged by the display dot of identical row's data driver to next line again.So go down in regular turn, when the display dot of the last column of having substituted the bad for the good, just again later since the charging again of first row.
Because liquid crystal molecule also has a specific character, it is constant, not so of long duration to be fixed on some voltage exactly always, even with the voltage cancellation, liquid crystal molecule can be because the destruction of characteristic, and can't rotate because of the variation of electric field again, to form different gray levels.So at set intervals, just must voltage be restored to the original state, destroyed with the characteristic of avoiding liquid crystal molecule.But consider that if picture shows the situation of same GTG always, and the display voltage of LCD is divided into two kinds of polarity, when the voltage of show electrode is higher than the electrode voltage of common electrode, be referred to as positive polarity.And when the voltage of show electrode is lower than the voltage of common electrode, just be referred to as negative polarity.No matter be positive polarity voltage or reverse voltage, one group of same brightness GTG can be arranged all.So when the pressure reduction absolute value of layer glass up and down is fixedly the time, the GTG that is showed is living.But under the both of these case, turning to of liquid crystal molecule but is opposite fully, also just can avoid turning to when being fixed on a direction characteristic destruction of being caused when liquid crystal molecule always.That is to say that when display frame was motionless always, we still can replace by what positive-negative polarity did not stop, it is motionless to reach display frame, the result that the while liquid crystal molecule is not destroyed.
If common electrode voltage Vcom (Common Voltage) is unusual, when you see the picture of LCD, will feel that picture has the sensation of flicker.It is not deliberately to let display frame one bright one go out make the visual effect of flicker, but because the picture displayed GTG when each frame update, has trickle change, lets human eye experience picture in flicker.Please refer to Fig. 2, the same gray scale voltage of positive-negative polarity just has difference, and promptly for the picture of same GTG, its positive polarity is unequal to the absolute pressure reduction of Vcom with its negative polarity to the absolute pressure reduction of Vcom, so the GTG of its reflection sensation is also just different.Under the situation of not stopping image switching,, will feel that picture is in continuous flicker because the positive-negative polarity picture alternately occurs.
According to the design of present LCD LCD, Vcom voltage produces in the printing board PCB loop, and through adjustable resistor its voltage is regulated.The method of the adjustment of this Vcom voltage is following: at first need specific being used to adjust the picture of Vcom voltage, through judging the flicker level of this picture, adjust adjustable rheostatic resistance, till this specific picture is not glimmered then.The shortcoming of this method:
The first, for each dissimilar LCD, the specific picture that is used to adjust Vcom voltage is also inequality, so need need to set this picture in the production phase.
The second, according to present LCD Development Trend, adjustable rheostat will adopt littler encapsulation, and this will certainly make troubles at volume production time adjustment Vcom voltage to producers.And Vcom voltage is with respect to other components and parts, and institute takes up space bigger, if can remove this assembly, just can reduce the area of PCB.
The 3rd, judge that the foundation whether Vcom voltage adjusts to the right place is that its specific picture is not glimmered, its judgement has individual's subjective factor, so just maybe be because personnel's individual difference causes Vcom voltage not to be adjusted to optimum condition.
The 4th, adjustable rheostat is a mechanical knob, and LCD possibly cause the Vcom variation in transportation.
Summary of the invention
The object of the present invention is to provide a kind of Vcom method of adjustment of liquid crystal panel, guarantee that LCD under different environment, can both be adjusted to the best with Vcom;
The object of the present invention is to provide a kind of Vcom adjusting gear of liquid crystal panel, guarantee that LCD under different environment, can both be adjusted to the best with Vcom.
In order to address the above problem, the invention provides a kind of Vcom method of adjustment of liquid crystal panel, may further comprise the steps:
S1: with liquid crystal panel zoning territory, each corresponding logical operation module in zone;
S2: time schedule controller cooperates logical operation module to provide primary data;
S3: the counterlogic computing module obtains the liquid crystal capacitance charging voltage of corresponding region;
S4: logical operation module obtains a positive polarity voltage and a reverse voltage through logical process;
S5: send positive polarity voltage and reverse voltage to power module;
S6: power module calculates the required common electrode voltage Vcom of liquid crystal panel.
Preferably, said time schedule controller cooperates logical operation module to provide two groups or more primary data.
Preferably, when adjusting common electrode voltage Vcom value for the first time, change common electrode voltage Vcom value through the slide rheostat in the adjustment power module.
Preferably, each logical operation module is arranged on the integrated circuit.
The present invention also provides a kind of Vcom adjusting gear of liquid crystal panel; Liquid crystal panel, some logical operation module, time schedule controller and power module; Said liquid crystal panel comprises several regions; The corresponding logical operation module that connects in each zone, time schedule controller is connected with liquid crystal panel, and power module is connected with logical operation module.
Preferably, said time schedule controller and power module are arranged on the printed-wiring board (PWB).
Preferably, also comprise some integrated circuit, said logical operation module correspondence is arranged on the integrated circuit.
Preferably, said liquid crystal panel is connected through some integrated circuit with printed-wiring board (PWB).
Preferably, comprise a slide rheostat in the said power module, regulate slide rheostat, change common electrode voltage Vcom initial value.
Compared with prior art, there is following technique effect in the present invention:
The present invention provides a kind of Vcom method of adjustment and device of liquid crystal panel, uses integrated circuit to carry out the aanalogvoltage adjustment, to export a common electrode voltage Vcom stable, accurate, that reliability is high.
The first, the present invention can guarantee that LCD under different environment, can both be adjusted to the best with Vcom;
The second, in the present invention, the Vcom good stability that regulates can not produce deviation in transportation;
The 3rd, regulate from effect and the essence of Vcom, need not rely on specific picture, the Vcom precision of output is high.
The 4th, can be according to different applications, the logical operation module of adjustment IC interior is to reach different regulating effects.
Description of drawings
Fig. 1 is the schematic equivalent circuit of full wafer TFT panel in the prior art;
Fig. 2 is the effect synoptic diagram of common electrode voltage Vcom in the prior art;
Fig. 3 is the structural representation of the Vcom adjusting gear of a kind of liquid crystal panel of the present invention;
Fig. 4 is the structural representation of power module of the present invention;
Fig. 5 is the adjustment process flow diagram of the Vcom method of adjustment of a kind of liquid crystal panel of the present invention.
Embodiment
Below in conjunction with accompanying drawing, specify.
Please refer to Fig. 3; A kind of Vcom adjusting gear of liquid crystal panel; Liquid crystal panel 1, some logical operation module, time schedule controller 21 and power module 22, liquid crystal panel 1 comprises several regions, the corresponding logical operation module that connects in each zone; Time schedule controller 21 is connected with liquid crystal panel 1, and power module 22 is connected with logical operation module.
In the present invention, the number of logical operation module is identical with the regional number of liquid crystal panel division.
In the present invention, time schedule controller 21 is arranged on the printed-wiring board (PWB) PWB2 with power module 22, and each logical operation module correspondence is arranged on the integrated circuit Source IC, and liquid crystal panel 1 is connected through some integrated circuit with printed-wiring board (PWB) PWB2.
The present invention does not limit the number of logical operation module, promptly can divide several zones to liquid crystal panel 1 and not limit yet.In the present embodiment; Three integrated circuit Source IC are arranged on the LCD; Comprise a logical operation module in each Source IC; Promptly a Source IC3 comprises that first logical operation module, 31, the two Source IC4 comprise that second logical operation module, 41, the Three S's ource IC5 comprise the 3rd logical operation module 51.Correspondence in the present invention; At first panel is divided into three zones; I.e. zone 1, zone 2 12 and zone 3 13, each zone is corresponding Source IC respectively, i.e. zone one 11 corresponding Source IC31; Zone 2 12 corresponding the 2nd Source IC41, zone 3 13 corresponding Three S's ource IC51.This zone also can be the picture element of some ad-hoc locations, and the present invention does not do concrete restriction.
In the present embodiment, comprise a slide rheostat in the power module 22, regulate slide rheostat, change common electrode voltage Vcom initial value.The present invention does not limit this, in the present invention promptly, can not connect slide rheostat yet.The structure of power module 22 is specific as follows:
Please refer to Fig. 4, in the present embodiment, power module 22 is a power module integrated circuit (power module IC), on this power module IC number of pins pin is set.This power module also comprises a logical operation processing module 221 and voltage correction module 222; This logical operation processing module 221 is connected with pin V2 with pin V1 respectively, and voltage correction module 222 is connected the back and is connected with pin Vout with logical operation processing module 221.Wherein, pin set is the initial setting up value of Vcom, and this pin pin connects a slide rheostat in the development phase, through adjusting the output voltage that this slide rheostat changes pin vout, thereby reaches the electric current that changes this pin, finally changes the voltage of Vcom.When being set in the development phase, this uses as regulating gray scale voltage.
In the present invention, can not connect slide rheostat.Pin V1 and Pin V2 are that voltage data receives pin; This pin receives positive voltage V+ and the negative voltage V-that handles via logical operation module; Calculate
via logical operation module then; Adjust the magnitude of voltage of Pin Vout according to the value of this voltage; Final this Pin current corresponding value that changes; Through dividing potential drop, give liquid crystal panel with correct Vcom voltage.
Utilize Vcom adjusting gear of the present invention, calculate the Vcom of monoblock panel, finally feed back to whole front panel.In different use fields, in order to improve the reliability of this Vcom adjustment, can panel be divided into several zones, calculate the correct Vcom in each zone respectively, finally feed back to each zone of panel then.Therefore, counter plate of the present invention is divided into several zones and does not do concrete restriction, and is corresponding, and the number of integrated circuit is not limited yet.
Please refer to Fig. 5, the present invention also provides a kind of Vcom method of adjustment of liquid crystal panel, may further comprise the steps:
S1: with liquid crystal panel zoning territory, each corresponding logical operation module in zone;
S2: time schedule controller cooperates logical operation module to provide primary data;
S3: the counterlogic computing module obtains the liquid crystal capacitance charging voltage of corresponding region;
S4: logical operation module obtains a positive polarity voltage and a reverse voltage through logical process;
S5: send positive polarity voltage and reverse voltage to power module;
S6: power module calculates the required common electrode voltage Vcom of liquid crystal panel.
The present invention does not limit the number of logical operation module.As three integrated circuit Source IC are arranged on the LCD; Comprise a logical operation module in each Source IC; Promptly a Source IC comprises first logical operation module, and the 2nd Source IC comprises second logical operation module, and Three S's ource IC comprises the 3rd logical operation module.
In the present invention, at first panel is divided into three zones, i.e. zone one, zone two and zone three; Each zone is a corresponding Source IC respectively; A promptly regional correspondence the one Source IC, zone two corresponding the 2nd Source IC, zone three corresponding Three S's ource IC.This zone also can be the picture element of some ad-hoc locations, and the present invention does not do concrete restriction.
Draw the voltage of the liquid crystal capacitance of the many correspondences of this zone or picture element then, to its pairing Source IC, so that gather the charging voltage of this liquid crystal capacitance.In the present embodiment; Can go out the ITO lead-in wire through optical etching and import voltage into the different illumination layer; Carry out data processing with voltage and the Source IC that collects in that one deck illumination then, present embodiment is just enumerated a kind of possibility that can realize, but the present invention is not limited thereto.
Before voltage data was gathered, the time schedule controller of LCD (Tcon) cooperated Source IC to provide two groups of primary datas respectively, i.e. two Frame data-signals.For example after receiving enable signal, Tcon provides the signal (supposing that this voltage is positive polarity) of first Frame (black picture).Like this, once the voltage that all charges to same GTG to zone three, Source IC collects first group of voltage data in the zone.The logical operation module that this data based Source IC is inner through logical process, obtains the voltage V+ of a positive polarity.In like manner can obtain the voltage V-of a negative polarity.These two voltages of handling through logical operation finally can be transferred to the power module IC on the printed-wiring board (PWB) PWB.
In the present invention, cooperate logical operation module to provide several groups of primary datas to time schedule controller and do not limit, in order to improve the accuracy of data processing, preferred, time schedule controller can provide two groups or more primary data.
In the present invention, when adjusting common electrode voltage Vcom value for the first time, can change the output voltage of power module, and then change common electrode voltage Vcom value through the slide rheostat in the adjustment power module.In the present invention, only need slide rheostat of adjustment, when adjusting Vcom, do not need to regulate again later on, promptly when each start, regulate.
Concrete, pin set is the initial setting up value of Vcom, this pin pin is in the development phase; Connect a slide rheostat; Through adjusting the output voltage that this slide rheostat changes pin vout, thereby reach the electric current that changes this pin, finally change the voltage of Vcom.When being set in the development phase, this uses as regulating gray scale voltage.
In the present invention, can not connect slide rheostat.Pin V1 and Pin V2 are that voltage data receives pin; This pin receives positive voltage V+ and the negative voltage V-that handles via logical operation module; Calculate V=(V1-V2)/2 via logical operation module then, the magnitude of voltage according to the value of this voltage adjustment Pin Vout finally changes this Pin current corresponding value; Through dividing potential drop, give liquid crystal panel with correct Vcom voltage.
Utilize Vcom adjusting gear of the present invention, calculate the Vcom of monoblock panel, finally feed back to whole front panel.In different use fields, in order to improve the reliability of this Vcom adjustment, can panel be divided into several zones, calculate the correct Vcom in each zone respectively, finally feed back to each zone of panel then.Therefore, counter plate of the present invention is divided into several zones and does not do concrete restriction, and is corresponding, and the number of Source IC is not limited yet.
Power module IC for after the sampling can design various Vcom values, to meet the different needs according to practical application area.
More than a disclosed specific embodiment that is merely the application, but the application is not limited thereto, any those skilled in the art can think variation, all should drop in the application's the protection domain.
Claims (9)
1. the Vcom method of adjustment of a liquid crystal panel is characterized in that, may further comprise the steps:
S1: with liquid crystal panel zoning territory, each corresponding logical operation module in zone;
S2: time schedule controller cooperates logical operation module to provide primary data;
S3: the counterlogic computing module obtains the liquid crystal capacitance charging voltage of corresponding region;
S4: logical operation module obtains a positive polarity voltage and a reverse voltage through logical process;
S5: send positive polarity voltage and reverse voltage to power module;
S6: power module calculates the required common electrode voltage Vcom of liquid crystal panel.
2. the Vcom method of adjustment of liquid crystal panel as claimed in claim 1 is characterized in that, said time schedule controller cooperates logical operation module to provide two groups or more primary data.
3. the Vcom method of adjustment of liquid crystal panel as claimed in claim 1 is characterized in that, when adjusting common electrode voltage Vcom value for the first time, changes common electrode voltage Vcom value through the slide rheostat in the adjustment power module.
4. the Vcom method of adjustment of liquid crystal panel as claimed in claim 1 is characterized in that, each logical operation module is arranged on the integrated circuit.
5. the Vcom adjusting gear of a liquid crystal panel; It is characterized in that; Liquid crystal panel, some logical operation module, time schedule controller and power module, said liquid crystal panel comprises several regions, the corresponding logical operation module that connects in each zone; Time schedule controller is connected with liquid crystal panel, and power module is connected with logical operation module.
6. the Vcom adjusting gear of liquid crystal panel as claimed in claim 5 is characterized in that, said time schedule controller and power module are arranged on the printed-wiring board (PWB).
7. the Vcom adjusting gear of liquid crystal panel as claimed in claim 5 is characterized in that, also comprises some integrated circuit, and said logical operation module correspondence is arranged on the integrated circuit.
8. like the Vcom adjusting gear of claim 6 or 7 described liquid crystal panels, it is characterized in that said liquid crystal panel is connected through some integrated circuit with printed-wiring board (PWB).
9. the Vcom adjusting gear of liquid crystal panel as claimed in claim 5 is characterized in that, comprises a slide rheostat in the said power module, regulates slide rheostat, changes common electrode voltage Vcom initial value.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201210106672.1A CN102645771B (en) | 2012-04-13 | 2012-04-13 | Vcom adjusting method and device for liquid crystal panel |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201210106672.1A CN102645771B (en) | 2012-04-13 | 2012-04-13 | Vcom adjusting method and device for liquid crystal panel |
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| CN102645771A true CN102645771A (en) | 2012-08-22 |
| CN102645771B CN102645771B (en) | 2014-12-17 |
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| CN201210106672.1A Expired - Fee Related CN102645771B (en) | 2012-04-13 | 2012-04-13 | Vcom adjusting method and device for liquid crystal panel |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103915071A (en) * | 2014-03-13 | 2014-07-09 | 京东方科技集团股份有限公司 | Display panel power supply voltage regulating device and method and display device |
| US11004369B2 (en) | 2017-01-10 | 2021-05-11 | Guangdong Oppo Mobile Telecommunications Corp., Ltd. | Screen flickering processing method and device, storage medium and electronic |
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| CN1527275A (en) * | 2003-03-04 | 2004-09-08 | 友达光电股份有限公司 | Automatic voltage regulator for common electrode in panel |
| CN100414361C (en) * | 2005-12-17 | 2008-08-27 | 群康科技(深圳)有限公司 | Liquid-crystal display panel and its voltage adjustment |
| CN201122218Y (en) * | 2007-12-11 | 2008-09-24 | 河南南方辉煌图像信息技术有限公司 | VCOM voltage circuit for automatic real-time regulating LCD |
| CN101303490A (en) * | 2007-05-09 | 2008-11-12 | 群康科技(深圳)有限公司 | LCD device and public voltage adjustment method |
| CN102117606A (en) * | 2009-12-30 | 2011-07-06 | 乐金显示有限公司 | Circuit for driving liquid crystal display device |
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2012
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Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1527275A (en) * | 2003-03-04 | 2004-09-08 | 友达光电股份有限公司 | Automatic voltage regulator for common electrode in panel |
| CN100414361C (en) * | 2005-12-17 | 2008-08-27 | 群康科技(深圳)有限公司 | Liquid-crystal display panel and its voltage adjustment |
| CN101303490A (en) * | 2007-05-09 | 2008-11-12 | 群康科技(深圳)有限公司 | LCD device and public voltage adjustment method |
| CN201122218Y (en) * | 2007-12-11 | 2008-09-24 | 河南南方辉煌图像信息技术有限公司 | VCOM voltage circuit for automatic real-time regulating LCD |
| CN102117606A (en) * | 2009-12-30 | 2011-07-06 | 乐金显示有限公司 | Circuit for driving liquid crystal display device |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103915071A (en) * | 2014-03-13 | 2014-07-09 | 京东方科技集团股份有限公司 | Display panel power supply voltage regulating device and method and display device |
| US9378700B2 (en) | 2014-03-13 | 2016-06-28 | Boe Technology Group Co., Ltd. | Device and method for adjusting a power supply voltage for a display panel, and display device |
| US11004369B2 (en) | 2017-01-10 | 2021-05-11 | Guangdong Oppo Mobile Telecommunications Corp., Ltd. | Screen flickering processing method and device, storage medium and electronic |
| US11056026B2 (en) | 2017-01-10 | 2021-07-06 | Guangdong Oppo Mobile Telecommunications Corp., Ltd. | Screen flickering processing method and device, storage medium and electronic device |
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| CN102645771B (en) | 2014-12-17 |
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Effective date of registration: 20180322 Address after: Room 212, room 1, No. 2358, Changan Road, Wujiang economic and Technological Development Zone, Suzhou, Jiangsu Co-patentee after: SHANGHAI ZHONGQIAO College Patentee after: Suzhou Xili Technology Services Ltd. Address before: 215217, No. 88, Tung Hing Road, Tongli District, Wujiang Economic Development Zone, Suzhou, Jiangsu Patentee before: CPTW (WUJIANG) Co.,Ltd. |
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Granted publication date: 20141217 |