CN102645771B - 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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- CN102645771B CN102645771B CN201210106672.1A CN201210106672A CN102645771B CN 102645771 B CN102645771 B CN 102645771B CN 201210106672 A CN201210106672 A CN 201210106672A CN 102645771 B CN102645771 B CN 102645771B
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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 liquid crystal image technical field, particularly a kind of Vcom method of adjustment of liquid crystal panel and device.
Background technology
TFT(Thin Film Transistor)---Thin Film Transistor (TFT), refer to that each the liquid crystal pixel point in liquid crystal display is all driven by the thin film transistor (TFT) be integrated in thereafter, thus high-speed high brightness high-contrast display screen information can be accomplished, common TFT-LCD(Thin Film Transistor-LCD) be the one of most liquid crystal display.Please refer to Fig. 1, is the equivalent electrical circuit of full wafer TFT panel, wherein each TFT and Clc(liquid crystal capacitance) with Cs(memory capacitance) institute's parallel connection, represent the point of a display.And the display unit Pixel that basic, then need three points shown like this, represent RGB three primary colors respectively.When panel works, scanner driver can export waveform as shown in the figure, is sequentially opened by the TFT of every a line, allows well the data driver of whole row simultaneously by the display of full line point, is charged to voltage required separately, shows different GTGs.When this line is charged, voltage is just closed by scanner driver, and then voltage is just opened by the scanner driver of next line, then carries out discharge and recharge by the display point of identical one row's data driver to next line.So sequentially go down, when the display point of substituting the bad for the good last column, just again later from the first row again charging.
Because liquid crystal molecule also has a kind of characteristic, can not be fixed on some voltage exactly constant, not so of long duration, even if cancelled by voltage, liquid crystal molecule can because the destruction of characteristic always, and cannot again because the change of electric field is rotated, to form different GTGs.So at set intervals, just by voltage resume original state, must be destroyed to avoid the characteristic of liquid crystal molecule.But considered that if picture shows the situation of same GTG always, the display voltage of liquid crystal display would be divided into two kinds of polarity, when electrode voltage higher than common electrode of the voltage of show electrode, would be referred to as positive polarity.And when voltage lower than common electrode of the voltage of show electrode, be just referred to as negative polarity.No matter be positive polarity voltage or reverse voltage, all can have one group of same brightness GTG.So when the pressure reduction absolute value of upper and lower layer glass is fixing, the GTG showed is living.But under both of these case, turning to of liquid crystal molecule is but completely contrary, also just can avoid when liquid crystal molecule turn to be fixed on a direction always time, the characteristic destruction of causing.That is, when display frame is always motionless, we still ceaselessly can replace by positive-negative polarity, reach display frame motionless, simultaneously the result that is not destroyed of liquid crystal molecule.
If common electrode voltage Vcom(Common is Voltage) abnormal, when you see the picture of liquid crystal display, will feel that picture has the sensation of flicker.It is not the visual effect deliberately allowing display frame one bright one go out to make flicker, but because the picture GTG of display is when each renewal picture, has trickle variation, allows human eye experience picture in flicker.Please refer to Fig. 2, the same gray scale voltage of positive-negative polarity just has difference, namely for the picture of same GTG, its positive polarity to the absolute pressure reduction of Vcom and the absolute pressure reduction of its negative polarity to Vcom unequal, so GTG sensation of its reflection is also just different.When not stopping image switching, because positive-negative polarity picture alternately occurs, will feel that picture is in continuous flicker.
According to the design of present liquid crystal display LCD, Vcom voltage produces in printing board PCB loop, and is regulated its voltage by adjustable resistor.The method of the adjustment of this Vcom voltage is as follows: first needing one specifically for adjusting the picture of Vcom voltage, then by judging the flicker level of this picture, adjusting adjustable rheostatic resistance, until this specific picture does not glimmer.The shortcoming of the method:
The first, for the LCD that each is dissimilar, not identical for the specific picture adjusting Vcom voltage yet, so need in the production phase, need to set this picture.
The second, the trend developed according to present LCD, adjustable rheostat will adopt less encapsulation, and this will certainly make troubles to producers' adjustment Vcom voltage when volume production.And Vcom voltage is relative to other components and parts, and institute takes up space comparatively large, if can remove this assembly, just can reduce the area of PCB.
3rd, judge that the foundation whether Vcom voltage adjusts to the right place is that its specific picture does not glimmer, it judges the subjective factor of band a guy, so just may, because of the individual difference of personnel, cause Vcom voltage not to be adjusted to optimum condition.
4th, adjustable rheostat is mechanical knob, and LCD, in transportation, may cause Vcom variation.
Summary of the invention
The object of the present invention is to provide a kind of Vcom method of adjustment of liquid crystal panel, ensure LCD in different environments, Vcom can be adjusted to the best;
The object of the present invention is to provide a kind of Vcom adjusting gear of liquid crystal panel, ensure LCD in different environments, Vcom can be adjusted to the best.
In order to solve the problem, the invention provides a kind of Vcom method of adjustment of liquid crystal panel, comprising the following steps:
S1: liquid crystal panel is divided into some regions, the corresponding logical operation module in each region;
S2: time schedule controller coordinates logical operation module to provide primary data;
S3: 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 common electrode voltage Vcom needed for liquid crystal panel.
Preferably, described time schedule controller coordinates logical operation module to provide two groups or more primary data.
Preferably, during first adjustment common electrode voltage Vcom value, change common electrode voltage Vcom value by the slide rheostat in adjustment power module.
Preferably, each logical operation module is arranged on an 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, described liquid crystal panel comprises some regions, each region correspondence connects a logical operation module, time schedule controller is connected with liquid crystal panel, and power module is connected with logical operation module.
Preferably, described time schedule controller and power module are arranged on a printed-wiring board.
Preferably, also comprise some integrated circuit, described logical operation module correspondence is arranged on an integrated circuit.
Preferably, described liquid crystal panel is connected by some integrated circuit with printed-wiring board (PWB).
Preferably, in described power module, comprise a slide rheostat, regulate slide rheostat, change common electrode voltage Vcom initial value.
Compared with prior art, there is following technique effect in the present invention:
The invention provides a kind of Vcom method of adjustment and device of liquid crystal panel, use integrated circuit to carry out analog voltage adjustment, with export one stable, accurately, common electrode voltage Vcom that reliability is high.
The first, the present invention can ensure LCD in different environments, Vcom can be adjusted to the best;
The second, in the present invention, the Vcom good stability regulated, can not produce deviation in transportation;
3rd, regulate from the effect of Vcom and essence, do not need to rely on specific picture, the Vcom precision of output is high.
4th, can according to different applications, the logical operation module of adjustment IC interior, to reach different regulating effects.
Accompanying drawing explanation
Fig. 1 is the schematic equivalent circuit of full wafer TFT panel in prior art;
Fig. 2 is the effect schematic diagram of common electrode voltage Vcom in 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, described in detail.
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 some regions, each region correspondence connects a logical operation module, 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 areal that liquid crystal panel divides.
In the present invention, time schedule controller 21 and power module 22 are arranged on printed-wiring board (PWB) PWB2, and each logical operation module correspondence is arranged on an integrated circuit Source IC, and liquid crystal panel 1 is connected by some integrated circuit with printed-wiring board (PWB) PWB2.
The number of the present invention to logical operation module is not restricted, and namely can divide several region to liquid crystal panel 1 and also not limit.In the present embodiment, liquid crystal display there are three integrated circuit Source IC, a logical operation module is comprised in each Source IC, namely a Source IC3 comprises the first logical operation module 31,2nd Source IC4 comprises the second logical operation module 41, Three S's ource IC5 and comprises the 3rd logical operation module 51.Correspondence in the present invention, first panel is divided into three regions, i.e. region 1, region 2 12 and region 3 13, each region is a corresponding Source IC respectively, the i.e. corresponding Source IC31 in region 1, region 2 12 corresponding 2nd Source IC41, the corresponding Three S's ource IC51 in region 3 13.This region also can be the picture element of some ad-hoc locations, and the present invention does not do concrete restriction.
In the present embodiment, in power module 22, comprise a slide rheostat, regulate slide rheostat, change common electrode voltage Vcom initial value.The present invention is not restricted this, namely in the present invention, also can not connect slide rheostat.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), and this power module IC arranges some pin pin.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 V1 and pin V2 respectively, and voltage correction module 222 is connected with logical operation processing module 221 rear and is connected with pin Vout.Wherein, pin set is the initial setting of Vcom, and this pin pin, in the development phase, connecting a slide rheostat, changing the output voltage of pin vout by adjusting this slide rheostat, thus reaches the electric current changing this pin, the final voltage changing Vcom.Use with making adjustments gray scale voltage when this is set in the development phase.
In the present invention, slide rheostat can not be connect.Pin V1 and Pin V2 is that voltage data receives pin, and this pin receives via a positive voltage V+ of logical operation module process and negative voltage V-, then calculates via logical operation module
, according to the magnitude of voltage of the value adjustment Pin Vout of this voltage, the current value that final this Pin of change is corresponding, by dividing potential drop, by correct Vcom voltage to liquid crystal panel.
Utilize Vcom adjusting gear of the present invention, calculate the Vcom of entire panel, finally feed back to whole panel.In different use fields, in order to improve the reliability that this Vcom adjusts, panel can be divided into several region, calculate the correct Vcom in each region respectively, then finally feed back to the regional of panel.Therefore, counter plate of the present invention is divided into several region and does not do concrete restriction, corresponding, the number of integrated circuit is not also restricted.
Please refer to Fig. 5, the present invention also provides a kind of Vcom method of adjustment of liquid crystal panel, comprises the following steps:
S1: liquid crystal panel is divided into some regions, the corresponding logical operation module in each region;
S2: time schedule controller coordinates logical operation module to provide primary data;
S3: 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 common electrode voltage Vcom needed for liquid crystal panel.
The number of the present invention to logical operation module is not restricted.As liquid crystal display there being three integrated circuit Source IC, a logical operation module is comprised in each Source IC, namely a Source IC comprises the first logical operation module, and the 2nd Source IC comprises the second logical operation module, and Three S's ource IC comprises the 3rd logical operation module.
In the present invention, first panel is divided into three regions, i.e. region one, region two and region three, each region is a corresponding Source IC respectively, the i.e. corresponding Source IC in region one, region two corresponding 2nd Source IC, the corresponding Three S's ource IC in region three.This region also can be the picture element of some ad-hoc locations, and the present invention does not do concrete restriction.
Then the voltage of this region or the multipair liquid crystal capacitance of answering of picture element is drawn, to the Source IC corresponding to it, to gather the charging voltage of this liquid crystal capacitance.In the present embodiment, ITO lead-in wire can be gone out by optical etching and voltage is passed to different illumination layers, then carry out data processing with the voltage that one deck illumination is collected and Source IC, the present embodiment just enumerates a kind of possibility that can realize, but the present invention is not limited thereto.
Before voltage data gathers, the time schedule controller (Tcon) of LCD coordinates Source IC to provide two groups of primary datas respectively, i.e. two Frame data-signals.Such as after receiving enable signal, Tcon provides first Frame(black picture) signal (supposing that this voltage is positive polarity).Like this, in region once the voltage all charging to same GTG to region three, Source IC collects first group of voltage data.These data, according to the logical operation module of Source IC inside, through logical process, obtain the voltage V+ of a positive polarity.In like manner can obtain the voltage V-of a negative polarity.These two voltages through logical operation process, finally can be transferred to the power module IC on printed-wiring board (PWB) PWB.
In the present invention, coordinate logical operation module to provide several groups of primary datas to time schedule controller and be not restricted, in order to improve the accuracy of data processing, preferably, time schedule controller can provide two groups or more primary data.
In the present invention, when first adjustment common electrode voltage Vcom value, the output voltage of power module can be changed by the slide rheostat in adjustment power module, and then change common electrode voltage Vcom value.In the present invention, only needing adjustment slide rheostat, later when carrying out adjustment Vcom, not needing to regulate again, namely regulate when each start.
Concrete, pin set is the initial setting of Vcom, and this pin pin is in the development phase, connect a slide rheostat, change the output voltage of pin vout by adjusting this slide rheostat, thus reach the electric current changing this pin, the final voltage changing Vcom.Use with making adjustments gray scale voltage when this is set in the development phase.
In the present invention, slide rheostat can not be connect.Pin V1 and Pin V2 is that voltage data receives pin, this pin receives via a positive voltage V+ of logical operation module process and negative voltage V-, then V=(V1-V2 is calculated via logical operation module)/2, according to the magnitude of voltage of the value adjustment Pin Vout of this voltage, the current value that this Pin of final change is corresponding, by dividing potential drop, by correct Vcom voltage to liquid crystal panel.
Utilize Vcom adjusting gear of the present invention, calculate the Vcom of entire panel, finally feed back to whole panel.In different use fields, in order to improve the reliability that this Vcom adjusts, panel can be divided into several region, calculate the correct Vcom in each region respectively, then finally feed back to the regional of panel.Therefore, counter plate of the present invention is divided into several region and does not do concrete restriction, corresponding, the number of Source IC is not also restricted.
For the power module IC after sampling, according to practical application area, various Vcom value can be designed, to meet the different needs.
Be only a specific embodiment of the application above, but the application is not limited thereto, the changes that any person skilled in the art can think of, all should drops in the protection domain of the application.
Claims (9)
1. a Vcom method of adjustment for liquid crystal panel, is characterized in that, comprise the following steps:
S1: liquid crystal panel is divided into some regions, the corresponding logical operation module in each region;
S2: time schedule controller coordinates logical operation module to provide primary data;
S3: 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 common electrode voltage Vcom needed for liquid crystal panel;
Wherein, a logical operation processing module is comprised in described power module, described logical operation processing module obtains described positive polarity voltage and described reverse voltage respectively by one first input pin and one second input pin, logical operation processing module calculates the mean value of described positive voltage and described negative voltage, thus adjustment one output voltage, described output voltage obtains required common electrode voltage Vcom after dividing potential drop.
2. the Vcom method of adjustment of liquid crystal panel as claimed in claim 1, is characterized in that, described time schedule controller coordinates 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, during first adjustment common electrode voltage Vcom value, changes common electrode voltage Vcom value by the slide rheostat in 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 an 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, described liquid crystal panel comprises some regions, each region correspondence connects a logical operation module, time schedule controller is connected with liquid crystal panel, and power module is connected with logical operation module;
Wherein, described power module comprises: a logical operation processing module, a voltage correction module, described voltage correction module is connected with described logical operation processing module rear and is connected with an output pin, and described logical operation processing module connects described logical operation module by one first input pin and one second input pin;
Described logical operation processing module obtains a cathode voltage and a cathode voltage of described logical operation module process respectively by described first input pin and described second input pin, described logical operation processing module calculates the mean value of described cathode voltage and described cathode voltage, thus adjusting the output voltage of described output pin, described output voltage obtains required common electrode voltage Vcom after dividing potential drop.
6. the Vcom adjusting gear of liquid crystal panel as claimed in claim 5, is characterized in that, described time schedule controller and power module are arranged on a printed-wiring board.
7. the Vcom adjusting gear of liquid crystal panel as claimed in claim 5, is characterized in that, also comprise some integrated circuit, and described logical operation module correspondence is arranged on an integrated circuit.
8. the Vcom adjusting gear of liquid crystal panel as claimed in claims 6 or 7, it is characterized in that, described liquid crystal panel is connected by 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, comprise a slide rheostat in described power module, regulates slide rheostat, changes common electrode voltage Vcom initial value.
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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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| 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 CN102645771A (en) | 2012-08-22 |
| CN102645771B true CN102645771B (en) | 2014-12-17 |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN103915071B (en) | 2014-03-13 | 2017-02-15 | 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 |
| CN106683603B (en) | 2017-01-10 | 2019-08-06 | Oppo广东移动通信有限公司 | A kind of splashette processing method and terminal |
Citations (5)
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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 |
-
2012
- 2012-04-13 CN CN201210106672.1A patent/CN102645771B/en not_active Expired - Fee Related
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 |
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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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