CN1684136A - Liquid crystal display and polarity reversion method - Google Patents
Liquid crystal display and polarity reversion method Download PDFInfo
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- CN1684136A CN1684136A CN 200510008369 CN200510008369A CN1684136A CN 1684136 A CN1684136 A CN 1684136A CN 200510008369 CN200510008369 CN 200510008369 CN 200510008369 A CN200510008369 A CN 200510008369A CN 1684136 A CN1684136 A CN 1684136A
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Abstract
The present invention provides a kind of polarity reversing method for LCD with several pixels. First, at least one reversing signal is provided to determine one polarity; then, one data voltage is generated based on the polarity and one data signal; and finally, one scanning signal is provided to open one pixel for reading the data voltage and sending corresponding brightness. The reversing signal is one non-periodic signal, and while the scanning signal opens the pixel, the reversing signal is in the first level or the second level optionally.
Description
Technical field
The present invention relates to LCD, relate in particular to the method for pixel reversal of poles in the LCD.
Background technology
Reversal of poles is technology common in the LCD, in order to eliminate the image retention problem of the long-term Dc bias of liquid crystal.Fig. 1 is the synoptic diagram of known LCD 100.Wherein comprise a cell array 102, a plurality of source driving chips 104, and a plurality of grid drive chip 106.This source driving chip 104 is accepted the control of time schedule controller 108, outputting data signals, and the sweep signal of these grid drive chip 106 outputs of arranging in pairs or groups, the brightness of corresponding pixel shows in the control cell array 102.Each source driving chip is on average controlled the pixel of some row, and each grid drive chip is on average controlled the pixel of several rows, so forms a plurality of minizones as shown in Figure 1 under the reciprocation.Wherein, this 108 provides to the signal of this source driving chip 104, comprises polarity inversion signal POL, in order to determine the polarity of corresponding pixel.Behind this source driving chip 104 receiving polarity reverse signal POL (H) or the POL (2H), according to data-signal and this polarity inversion signal POL value of time schedule controller 108 outputs, produce the data voltage of opposed polarity, to drive corresponding pixel.The value of this polarity inversion signal POL can change along with the sequential of grid drive chip 106 in addition, makes the polarity of each adjacent image point neither identical.Wherein POL (2H) the expression signal period is the twice of POL (H).So under the collocation, can reach an effect of counter-rotating (dotinversion)."+" among the figure and "-" are used for being illustrated in the one scan time frame (time frame), in order to the polarity of the data voltage that drives each interval pixel.
Yet the common sequelae of reversal of poles is that when importing specific picture texture, scintillation can appear in whole LCD.This specific picture texture is called city's pine picture (KillerPattern), and its origin cause of formation mainly from the electrical conductivity restriction of panel itself, has caused each regional signal voltage error unavoidablely.Fig. 2 is the sequential chart of the polarity inversion signal POL that time schedule controller 208 is produced among Fig. 1.Wherein GCK represents pulse sweep time, and polarity inversion signal POL (1H) is in each sweep trace polarity of just reversing one time, polarity inversion signal POL (2H) then be per two sweep traces counter-rotating once.So way can make the city pine picture of Fig. 1 improve, but still finds another group city pine picture and make the LCD flicker.In other words as long as polarity inversion signal POL has periodically, then there is corresponding city's pine picture forever.
Summary of the invention
The invention provides a kind of polar inversion method, be used to comprise the LCD of a plurality of pixels.At first provide at least one reverse signal, to determine a polarity.Then, produce a data voltage according to this polarity and a data-signal.The one scan signal is provided at last, opens a pixel and make it to read this data voltage, thereby send corresponding brightness.Wherein this reverse signal is an aperiodicity signal, and when this sweep signal was opened this pixel, the value of this reverse signal was one first level or one second level, selects one of them at random.
When this reverse signal during, this polarity just is defined as, and, this polarity is defined as bearing when this reverse signal during at this second level at this first level.This first level is the logical one value, and this second level is the logical zero value.
The polar inversion method of present embodiment, also further these pixels can be divided into many group pixels with the unit of classifying as, each group pixel comprises at least one row pixel, and this provides the step of at least one reverse signal, comprising provides a plurality of reverse signals, determines the polarity of one group of pixel respectively.
The present invention also provides a kind of LCD, comprises time schedule controller, one source pole chip for driving, and a grid drive chip.This time schedule controller control timing to be producing an one scan signal and a data-signal, and the polarity of at least one reverse signal with a definite data voltage is provided.This source driving chip couples this time schedule controller, produces this data voltage according to this reverse signal and this data-signal.This grid drive chip couples this time schedule controller, exports this sweep signal to open at least one pixel.When this sweep signal is opened this pixel, this data voltage of this pixel reads, thereby show image.
Description of drawings
Fig. 1 is the synoptic diagram of known LCD 100;
Fig. 2 is the sequential chart of Fig. 1 Semi-polarity reverse signal POL;
Fig. 3 is the LCD 300 of one of embodiment of the invention;
Fig. 4 is the LCD 400 of one of embodiment of the invention;
Fig. 5 is the LCD 500 of one of embodiment of the invention; And
Fig. 6 is the process flow diagram of polar inversion method of the present invention.
Symbol description:
102～cell array, 104～source driving chip
106～grid drive chip, 208～time schedule controller
114～source driving chip, 302～phase inverter
208～time schedule controller, 308～time schedule controller
408～time schedule controller, 508～time schedule controller
Embodiment
Fig. 3 is the LCD 300 of one of embodiment of the invention.Wherein comprise 102, three grid drive chip 106 of a cell array, and source driving chip 104 and 114 each four.Source driving chip 104 and 114 be not both with the odd even that puts in order and divide, each is responsible for driving corresponding a plurality of row pixels.In addition, this LCD 300 comprises time schedule controller 308, exports a polarity inversion signal POL, through a phase inverter 302, make source driving chip 104 and 114 receive anti-phase polarity inversion signal POL, thereby make odd and even number group pixel have anti-phase reverse speed characterisstic at random.
Fig. 4 is the LCD 400 of one of embodiment of the invention.Wherein comprise 102, three grid drive chip 106 of a cell array, and eight source driving chips 104.Each source driving chip 104 is responsible for driving corresponding a plurality of row pixels.In addition, this LCD 400 comprises time schedule controller 408, exports eight different polarity inversion signal POL to corresponding source driving chip 104, makes the counter-rotating at random separately when driving of corresponding a plurality of row pixels.During display frame, time schedule controller 408 inputs to these grid drive chip 106 and corresponding source driving chips 104 with an one scan signal and a data-signal.This source driving chip 104 couples this time schedule controller 408, produces the data voltage that the driving pixel is used according to received polarity inversion signal POL and this data-signal.In other words, the polarity of this data voltage is negative just, is determined at this moment by polarity inversion signal POL.This grid drive chip 106 is subjected to the control of this time schedule controller, exports this sweep signal to open pixel corresponding in the cell array 102.When a pixel is unlocked in the cell array 102, this data voltage of this pixel reads, thereby show image.
Fig. 5 is the LCD 500 of another embodiment of the present invention.Different with LCD 400 is, these source driving chips 104 are divided into source driving chip 104 and 114 according to putting in order, and each correspondence is coupled to time schedule controller 508, receives different polarity inversion signal control.In other words, four source driving chips 104 are subjected to first group of polarity inversion signal POL (A) control, four source driving chips 114 are subjected to second group of polarity inversion signal POL (B) control, between these two groups of polarity inversion signal POL, can be relation inverting each other as shown in Figure 1, it be independent mutually also can to not the least concerned.Maximum difference is that the polarity of POL is switched and the no periodic order.
The reverse signal generator produces the mechanism of aperiodicity random signal, can utilize various generation of random number to realize.The value of polarity inversion signal POL mainly is defined as two kinds of noble potential and electronegative potentials in the present embodiment, and therefore the probability that occurs at random respectively is 1/2nd.For instance, can use pseudorandom number generator, with any one Dynamic Signal that changes in time, as random number seed (random seed) input, produce through the hash conversion 0 or 1 two kind may, be used for representing noble potential and electronegative potential.These polarity inversion signals POL as shown in Figure 4 can be out of the ordinary the generation by the same circuit different random number seed of input.Yet because the appearance of noble potential and electronegative potential, aperiodicity can be sayed, so even under a certain display cycle, occur the picture that a meeting makes this LCD flicker occasionally, also can not influence user's visual experience at the no track of next display cycle disappearance.
The texture of time schedule controller in further can the judgment data signal produces corresponding reverse signal ordered series of numbers through the calculation back, in order to painstakingly to avoid causing the frequency of flicker, strengthens picture quality.In one scan in the cycle, these grid drive chip 106 can be according to each row pixel in the certain sequence scanning element array 102, the reverse signal ordered series of numbers that this time schedule controller then produces according to this calculation sends the polarity that polarity inversion signal POL determines corresponding pixel in regular turn.
Fig. 6 is the polar inversion method process flow diagram of one of embodiment of the invention.At first in step 602, provide polarity inversion signal POL, to determine polarity by the reverse signal generator.This polarity is what to determine at random, and its value just comprises and negative two kinds of selections.Then, in step 604, the data-signal that source driving chip 104 and 114 sends according to this polarity and time schedule controller produces a data voltage.Wherein the polarity of this data voltage is promptly determined by polarity inversion signal POL, and the value size is determined by this data voltage.In step 606, provide the one scan signal at last, open a pixel and make it to read this data voltage, thereby send corresponding brightness by grid drive chip 106.In a display cycle, sweep trace is normally lined by line scan in regular turn from top to bottom, and each row pixel is unlocked the back respectively by corresponding source driving chip, with the data voltage driving that produces separately, so the polarity of every bit is that plus or minus occurs at random in the whole image, has avoided known flicker problem.
In addition, because being provided with of reverse signal may increase the output pin of time schedule controller position, increase cost.So the present invention is more suitable for being applied in the framework of point-to-point transmission pattern, polarity inversion signal POL and other control signal is reached source driving chip with mode of serial transmission by time schedule controller, and do not need extra output pin position.
The embodiment that more than provides has highlighted many characteristics of the present invention.Though the present invention discloses as above with preferred embodiment, so it is not in order to limiting scope of the present invention, any those skilled in the art, without departing from the spirit and scope of the present invention, when doing various changes and retouching.The branch section header carried according to regulation of this instructions is not used in and limits that to carry in its content described scope, the especially background technology may not be the known invention that has disclosed in addition, and invention description is also non-in order to limit technical characterictic of the present invention.Be when looking being as the criterion that the accompanying Claim book defined with novelty of the present invention, creativeness and protection domain.
Claims (11)
1. polar inversion method is used to comprise the LCD of a plurality of pixels, comprises the following step:
Provide at least one reverse signal, in order to determine a polarity;
According to this polarity and a data-signal, produce a data voltage; And
The one scan signal is provided, makes it to read this data voltage in order to open a pixel, thereby send corresponding brightness; Wherein
This reverse signal is an aperiodicity signal; And
When this sweep signal was opened this pixel, the value of this reverse signal was one first level or one second level, selects one of them at random.
2. polar inversion method as claimed in claim 1 further comprises:
When this reverse signal during, this polarity just is defined as at this first level; And
When this reverse signal during, this polarity is defined as bearing at this second level.
3. polar inversion method as claimed in claim 2, wherein:
This first level is the logical one value; And
This second level is the logical zero value.
4. polar inversion method as claimed in claim 1 further comprises described pixel is divided into many group pixels with the unit of classifying as, and each group pixel comprises at least one row pixel, wherein:
The described step that at least one reverse signal is provided, comprising provides a plurality of reverse signals, determines the polarity of one group of pixel respectively.
5. polar inversion method as claimed in claim 4, wherein:
These a plurality of reverse signals are a strange reverse signal and an even reverse signal;
This strange reverse signal is determined the polarity of odd number group pixel in these many group pixels; And
This idol reverse signal is determined the polarity of even number set pixel in these many group pixels.
6. LCD comprises:
Time schedule controller producing an one scan signal and a data-signal, and provides the polarity of at least one reverse signal with a definite data voltage in order to control timing;
At least one source driving chip couples this time schedule controller, in order to according to this reverse signal and this data-signal, produces this data voltage;
At least one grid drive chip couples this time schedule controller, in order to export this sweep signal to open at least one pixel; Wherein
When this sweep signal is opened this pixel, this data voltage of this pixel reads, thereby show image; And
When this pixel was unlocked, the value of this reverse signal was one first level or one second level, selects one of them at random.
7. LCD as claimed in claim 6, wherein:
When this reverse signal during at this first level, the polarity of determining pixel is for just; And
When this reverse signal during at this second level, the polarity of determining pixel is for negative.
8. LCD as claimed in claim 7, wherein:
This first level is the logical one value; And
This second level is the logical zero value.
9. LCD as claimed in claim 6, wherein:
This at least one source driving chip is a plurality of source driving chips, at least one row pixel of corresponding respectively driving; And
This time schedule controller provides a reverse signal to corresponding one source pole chip for driving respectively.
10. LCD as claimed in claim 9, wherein:
Described source driving chip according to ordering, is divided into two kinds of strange source driving chip and even source driving chips;
This time schedule controller produces a strange reverse signal, determines the polarity of the pairing pixel of described strange source driving chip; And
This time schedule controller produces an even reverse signal, determines the polarity of the pairing pixel of described even source driving chip.
11. LCD as claimed in claim 6, wherein:
On line between this time schedule controller and the described source driving chip is the point-to-point transmission framework.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB2005100083698A CN100409301C (en) | 2005-02-21 | 2005-02-21 | Liquid crystal display and polarity reversion method |
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| Application Number | Priority Date | Filing Date | Title |
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| CNB2005100083698A CN100409301C (en) | 2005-02-21 | 2005-02-21 | Liquid crystal display and polarity reversion method |
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| CN1684136A true CN1684136A (en) | 2005-10-19 |
| CN100409301C CN100409301C (en) | 2008-08-06 |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103703503A (en) * | 2011-05-11 | 2014-04-02 | 京瓷显示器株式会社 | Liquid crystal display device |
| CN106486086A (en) * | 2017-01-05 | 2017-03-08 | 京东方科技集团股份有限公司 | A kind of source electrode driving device, its polarity inversion control method and liquid crystal indicator |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| JP2002244621A (en) * | 2001-02-06 | 2002-08-30 | Internatl Business Mach Corp <Ibm> | Display device, and liquid crystal display device and driving method therefor |
| JP3745259B2 (en) * | 2001-09-13 | 2006-02-15 | 株式会社日立製作所 | Liquid crystal display device and driving method thereof |
| KR100884997B1 (en) * | 2002-11-19 | 2009-02-20 | 엘지디스플레이 주식회사 | A driving circuit and a method for driving liquid crystal display device |
| CN100358003C (en) * | 2003-03-20 | 2007-12-26 | 凌阳科技股份有限公司 | Liquid crystal display device and its driving method |
| KR100947772B1 (en) * | 2003-06-03 | 2010-03-15 | 엘지디스플레이 주식회사 | Method and Apparatus for Driving Liquid Crystal Display Device |
| KR100552905B1 (en) * | 2003-06-30 | 2006-02-22 | 엘지.필립스 엘시디 주식회사 | Apparatus and method driving of liquid crystal display device |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103703503A (en) * | 2011-05-11 | 2014-04-02 | 京瓷显示器株式会社 | Liquid crystal display device |
| CN106486086A (en) * | 2017-01-05 | 2017-03-08 | 京东方科技集团股份有限公司 | A kind of source electrode driving device, its polarity inversion control method and liquid crystal indicator |
| CN106486086B (en) * | 2017-01-05 | 2019-07-30 | 京东方科技集团股份有限公司 | A kind of source electrode driving device, its polarity reversion control method and liquid crystal display device |
| US11308903B2 (en) | 2017-01-05 | 2022-04-19 | Boe Technology Group Co., Ltd. | Source driving device, polarity reversal control method thereof, and liquid crystal display device |
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| CN100409301C (en) | 2008-08-06 |
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Owner name: YOUDA PHOTOELECTRIC CO., LTD. Free format text: FORMER OWNER: GUANGHUI ELECTRONIC CO., LTD. Effective date: 20080215 |
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Effective date of registration: 20080215 Address after: Hsinchu, Taiwan, China Applicant after: AU OPTRONICS Corp. Address before: Taoyuan County of Taiwan Province Applicant before: QUANTA DISPLAY INCORPORATION |
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