CN102201205A - Driving method of liquid crystal device - Google Patents
Driving method of liquid crystal device Download PDFInfo
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- CN102201205A CN102201205A CN 201010132888 CN201010132888A CN102201205A CN 102201205 A CN102201205 A CN 102201205A CN 201010132888 CN201010132888 CN 201010132888 CN 201010132888 A CN201010132888 A CN 201010132888A CN 102201205 A CN102201205 A CN 102201205A
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Abstract
The invention relates to a driving method of a liquid crystal device. The liquid crystal device comprises a plurality of scanning lines, a plurality of data lines and a plurality of pixel units, wherein each pixel unit corresponds to one scanning line and one data line. The driving method comprises: at least two scanning lines are simultaneously conducted, wherein the at least two scanning lines are separated at an interval of at least one scanning line which is not conducted simultaneously and are different from all the data lines coupled with the at least two scanning lines; and respective image data is transmitted to the data lines coupled with the at least two scanning lines. By utilizing the driving method, the problems of bad display pictures and errors of the display pictures can be solved.
Description
Technical field
The invention relates to liquid crystal indicator, particularly the driving method of relevant a kind of liquid crystal indicator.
Background technology
The viewing area of liquid crystal indicator mainly comprises multi-strip scanning line, many data lines and a plurality of pixel cells that are arranged.Each pixel cell is to be controlled with show image by sweep trace that couples with it and data line.All pixel cells respectively have a thin film transistor (TFT) (Thin Film Transistor; TFT) as on-off element, when sweep trace of conducting, each pixel cell can be connected with its corresponding data line and receives image data on this moment this sweep trace, and each pixel cell can be charged to suitable voltage.Make this sweep trace become the state of not conducting then, just can receive image data more again when next conducting, then conducting time sweep trace repeats above-mentioned steps to receive image data.
The drive principle of look preface method (Color Sequential Method) is to utilize red, blue, green three looks to make the color that temporal switching reaches required demonstration, owing to need to switch fast, so the reaction time of liquid crystal wants fast.Seeing also Fig. 1, is the sequential chart that illustrates look preface method.Look preface method can be divided into three partly according to the control of time shaft.First partly is the thin film transistor (TFT) of each pixel cell of conducting and the time T of charging
TFTSecond partly is the time T that voltage that liquid crystal is applied by thin film transistor (TFT) rotates to the expection shade of gray
LCThe 3rd partly is after treating that the liquid crystal rotation finishes, the time T of quickflashing redness (R) backlight
BL, only finish the image of 1/3 picture (1/3Frame) this moment.Then repeat aforesaid way and finish the driving of green (G) backlight and blue (B) backlight respectively again, to finish the colour picture of 1 image time (Frame Time).Owing to need utilize red, blue, green three looks to make the color that temporal switching reaches required demonstration in regular turn, so during with look preface method show image, liquid crystal need have fast the reaction time (Fast Response Time) and the thin film transistor (TFT) duration of charging is wanted fast characteristic.
At present more and more higher to the requirement of the renewal frequency of liquid crystal indicator, be 240 hertz of (Hertz in sweep frequency; Hz), when the resolution setting value was 1600*900 (i.e. 900 sweep traces of 1600 data line *), the duration of charging of every sweep trace of the liquid crystal indicator that drives with look preface method was estimated as:
Characteristic according to present liquid crystal indicator, the duration of charging of pixel cell needs 7 μ s at least, if consider again to show that a picture is to the interval time that shows next picture, then every sweep trace duration of charging needs at least greater than 9 μ s, so the multi-strip scanning of conducting simultaneously line is two or three sweep traces for example, to increase the duration of charging is twice or three times, makes its duration of charging increase to 9.2 μ s or 13.8 μ s, could solve the situation of undercharge.
For the voltage that allows charging finish can remain to frame update next time, each pixel cell comprises that (Storage Capacitor is Cs) in order to store the voltage that this charging is finished for a storage capacitors.General common storage capacitors has two kinds of frameworks, is respectively Cs and is positioned at lock mo(u)ld top half (Cs On Gate) and Cs self (Cs On Common).It is that the interlayer electric capacity that utilizes show electrode and gate (Gate) cabling to form is produced storage capacitors that Cs is positioned at the lock mo(u)ld top half.The Cs self is that the interlayer electric capacity that utilizes show electrode and common (Common) cabling to form is produced storage capacitors.Because Cs is positioned at the lock mo(u)ld top half and needn't need increases an extra common cabling as the Cs self, so its aperture opening ratio (Aperture Ratio) is bigger, so use Cs to be positioned at the framework of lock mo(u)ld top half now mostly.
Seeing also Fig. 2, is the equivalent circuit diagram that the Cs that illustrates liquid crystal indicator is positioned at the lock mo(u)ld top half.Pixel cell 10 comprises liquid crystal capacitance CLC, storage capacitors CS and thin film transistor (TFT) 100, and it is coupled to corresponding sweep trace 102 and data line 104.Because storage capacitors CS has adopted the framework that is positioned at the lock mo(u)ld top half, so storage capacitors CS can be connected to last sweep trace 106.That is to say that both voltage differences of moment that storage capacitors CS never is conducting to conducting at sweep trace 102 can be subjected to the influence of sweep trace 102 and sweep trace 106 (being last sweep trace), this voltage differences is called feedback (Feedthrough) voltage.
As mentioned above, for solving the situation of undercharge, need for example three sweep traces of the multi-strip scanning of conducting simultaneously line, if adopt the framework that is positioned at the lock mo(u)ld top half, simultaneously for example when Gn, Gn+1, Gn+2, its display frame meeting be that unit produces the black or white phenomenon of black and white in vain with three to continuous three sweep traces of conducting.This is because the feedback voltage of each sweep trace of framework of lock mo(u)ld top half can be subjected to the influence of last sweep trace, and last the sweep trace (being Gn-1) of Gn is the state of not conducting, last the sweep trace of Gn+1, Gn+2 (being Gn, Gn+1) is the state of conducting, therefore Gn+1 has identical feedback voltage with Gn+2, but it is different with the feedback voltage of Gn, the liquid crystal voltage that causes Gn and the pixel cell of Gn+1, Gn+2 to be experienced also can be different, so can become the white black or white phenomenon of black and white at complete white picture, and can't normally show white picture.
Therefore need there be the problem of bright dark inequality to propose a solution in the multi-strip scanning line to the above-mentioned liquid crystal indicator that utilizes look preface method to drive.
Summary of the invention
The object of the present invention is to provide a kind of driving method of liquid crystal indicator, the bad problem of display frame when being intended to solve when existing in the prior art the continuous multi-strip scanning line of conducting.
The present invention realizes like this, a kind of driving method of liquid crystal indicator, described liquid crystal indicator comprises multi-strip scanning line, many data lines and a plurality of pixel cell, each pixel cell is to correspond to the one of described sweep trace and the one of described data line, and described driving method comprises:
At least two in the described sweep trace of conducting simultaneously, described at least two sweep traces are that at least one sweep trace and each described data line of coupling with each described at least two sweep trace of conducting simultaneously is neither not identical at interval; And
Transmit each other image data to each the described data line that couples with described at least two sweep traces.
The driving method of liquid crystal indicator of the present invention can solve pixel cell undercharge and the bad problem of display frame on each sweep trace by at least one sweep trace of conducting simultaneously not at interval between the multi-strip scanning line of simultaneously conducting multi-strip scanning line and conducting at the same time.Moreover the data line that the multi-strip scanning line of conducting is simultaneously coupled is neither identically then can avoid having on same the data line conducting simultaneously of multi-strip scanning line, thereby causes the problem of display frame mistake.
Description of drawings
Fig. 1 is the sequential chart of the look preface method of prior art;
Fig. 2 is the equivalent circuit diagram that the Cs of the liquid crystal indicator of prior art is positioned at the lock mo(u)ld top half;
Fig. 3 is the Organization Chart of the driving method of the liquid crystal indicator that provides of the embodiment of the invention; And
Fig. 4 is the sweep trace control timing figure that the embodiment of the invention provides.
Embodiment
In order to make purpose of the present invention, technical scheme and beneficial effect clearer,, the present invention is further elaborated below in conjunction with drawings and Examples.Should be appreciated that specific embodiment described herein only in order to explanation the present invention, and be not used in qualification the present invention.
Seeing also Fig. 3, is the Organization Chart of the driving method of the liquid crystal indicator 30 that provides of the embodiment of the invention.This liquid crystal indicator 30 comprises multi-strip scanning line G1 to G12, many data line D1 to D9 and a plurality of pixel cell 300, each pixel cell 300 is to correspond to the one of sweep trace G1 to G12 and the one of data line D1 to D9, this driving method be simultaneously many among the conducting sweep trace G1 to G12 to increase the duration of charging, wherein the sweep trace of conducting is the not sweep trace of conducting simultaneously of interval at least one, the influence that the sweep trace that prevents conducting simultaneously continuously is subjected to last sweep trace causes the feedback voltage difference, and the data line that couples with the sweep trace of each conducting is neither identical, and its purpose will be in explaining after a while.Below with specifier three embodiment of the condition of stating that close.Among first embodiment, the step of this driving method is as follows:
The sweep trace of conducting simultaneously G1, G5, G9, the then not conducting of sweep trace G2 to G4 at interval between sweep trace G1 and the sweep trace G5, the also not conducting of sweep trace G6 to G8 at interval between sweep trace G5 and the sweep trace G9, and sweep trace G1, G5, G9 are coupled to the different pieces of information line, in the present embodiment, sweep trace G1 is coupled to data line D1, D4, D7, and sweep trace G5 is coupled to data line D2, D5, D8, and sweep trace G9 is coupled to data line D3, D6, D9.
Transmit each data line D2, D5, D8 that each other image data couples to each data line D1, D4 of coupling with sweep trace G1, D7, with sweep trace G5 and each data line D3, D6, the D9 that couples with sweep trace G9.The corresponding pixel cell 300 of data line D1 to D9 receives and stores each image data.
Follow the sweep trace of conducting simultaneously G2, G6, G10, the then not conducting of sweep trace G3 to G5 at interval between sweep trace G2 and the sweep trace G6, the also not conducting of sweep trace G7 to G9 at interval between sweep trace G6 and the sweep trace G10, and sweep trace G2, G6, G10 are coupled to the different pieces of information line, in the present embodiment, sweep trace G2 is coupled to data line D2, D5, D8, and sweep trace G6 is coupled to data line D3, D6, D9, and sweep trace G10 is coupled to data line D1, D4, D7.
Transmit each data line D3, D6, D9 that each other image data couples to each data line D2, D5 of coupling with sweep trace G2, D8, with sweep trace G6 and each data line D1, D4, the D7 that couples with sweep trace G10.The corresponding pixel cell 300 of data line D1 to D9 receives and stores each image data.
Follow the sweep trace of conducting simultaneously G3, G7, G11 again, the then not conducting of sweep trace G4 to G6 at interval between sweep trace G3 and the sweep trace G7, the also not conducting of sweep trace G8 to G10 at interval between sweep trace G7 and the sweep trace G11, and sweep trace G3, G7, G11 are coupled to the different pieces of information line, in the present embodiment, sweep trace G3 is coupled to data line D3, D6, D9, and sweep trace G7 is coupled to data line D1, D4, D7, and sweep trace G11 is coupled to data line D2, D5, D8.
Transmit each data line D1, D4, D7 that each other image data couples to each data line D3, D6 of coupling with sweep trace G3, D9, with sweep trace G7 and each data line D2, D5, the D8 that couples with sweep trace G11.The corresponding pixel cell 300 of data line D1 to D9 receives and stores each image data.
The last sweep trace of conducting simultaneously G4, G8, G12, the then not conducting of sweep trace G5 to G7 at interval between sweep trace G4 and the sweep trace G8, the also not conducting of sweep trace G9 to G11 at interval between sweep trace G8 and the sweep trace G12, and sweep trace G4, G8, G12 are coupled to the different pieces of information line, in the present embodiment, sweep trace G4 is coupled to data line D1, D4, D7, and sweep trace G8 is coupled to data line D2, D5, D8, and sweep trace G12 is coupled to data line D3, D6, D9.
Transmit each data line D2, D5, D8 that each other image data couples to each data line D1, D4 of coupling with sweep trace G4, D7, with sweep trace G8 and each data line D3, D6, the D9 that couples with sweep trace G12.The corresponding pixel cell 300 of data line D1 to D9 receives and stores each image data.
In the present embodiment, with while conducting three sweep trace G1, G5, G9 is example, 3 sweep traces of conducting simultaneously not at interval between sweep trace G1 and the sweep trace G5, also 3 sweep traces of conducting simultaneously not at interval between sweep trace G5 and the sweep trace G9, in other embodiments, between sweep trace G1 and the sweep trace G5 at interval not the quantity of the sweep trace of conducting simultaneously can and sweep trace G5 and sweep trace G9 between the quantity of the sweep trace of while conducting is not different at the institute interval.
Seeing also Fig. 4, is the sweep trace control timing figure that the embodiment of the invention provides.At first conducting enable signal OE postpones the input of all signals and can not carry out any scanning motion, and promptly when enable signal OE was high levle, sweep trace G1 to G12 can not be switched on.This enable signal OE is meant and shows that a picture is to the interval time that shows next picture.When enable signal OE (becoming the moment of low level from high levle) when high levle becomes low level and detect first negative edge of sweep frequency (Gate Clock), with this first initial pulse wave of negative edge trigger sweep (Gate Start Pulse), begin to carry out scanning, the sweep trace of conducting at first simultaneously G1, G5, G9, when second negative edge of sweep frequency (Gate Clock) is triggered, make sweep trace G1, G5, G9 becomes not conducting and the sweep trace of conducting simultaneously G2, G6, G10, when then the 3rd negative edge of sweep frequency (Gate Clock) is triggered, make sweep trace G2, G6, G10 becomes not conducting and the sweep trace of conducting simultaneously G3, G7, G11, when the 4th negative edge of last sweep frequency (Gate Clock) is triggered, make sweep trace G3, G7, G11 becomes not conducting and the sweep trace of conducting simultaneously G4, G8, G12, finish the scanning of a picture, the scanning that so goes round and begins again.
The step of second embodiment of notion is as follows according to the present invention:
The sweep trace of conducting simultaneously G1, G3, at interval then not conducting of sweep trace G2 between sweep trace G1 and the sweep trace G3, and sweep trace G1, G3 be coupled to the different pieces of information line, in the present embodiment, sweep trace G1 is coupled to data line D1, D4, D7, and sweep trace G3 is coupled to data line D3, D6, D9.
Transmit each other image data to each data line D1, the D4, the D7 that couple with sweep trace G1 and each data line D3, D6, the D9 that couples with sweep trace G3.Data line D1, D4, D7, D3, the corresponding pixel cell 300 of D6, D9 receive and store each image data.
Follow the sweep trace of conducting simultaneously G2, G4, the then not conducting of sweep trace G3 at interval between sweep trace G2 and the sweep trace G4, and sweep trace G2, G4 are coupled to the different pieces of information line, in the present embodiment, sweep trace G2 is coupled to data line D2, D5, D8, and sweep trace G4 is coupled to data line D1, D4, D7.
Transmit each other image data to each data line D2, the D5, the D8 that couple with sweep trace G2 and each data line D1, D4, the D7 that couples with sweep trace G4.Data line D2, D5, D8, D1, the corresponding pixel cell 300 of D4, D7 receive and store each image data.
The conducting order of sweep trace G5 to G8 is identical with the conducting order of above-mentioned sweep trace G1 to G4, i.e. simultaneously conducting sweep trace G5, G7, transmit each other image data to each data line D2, the D5, the D8 that couple with sweep trace G5 and each data line D1, D4, the D7 that couples with sweep trace G7, corresponding pixel cell 300 receives and also stores each image data.Then simultaneously conducting sweep trace G6, G8 transmit each other image data to each data line D3, the D6, the D9 that couple with sweep trace G6 and each data line D2, D5, the D8 that couples with sweep trace G8, and corresponding pixel cell 300 receives and also stores each image data.
At last, the conducting order of sweep trace G9 to G12 is identical with the conducting order of above-mentioned sweep trace G1 to G4 and sweep trace G5 to G8, i.e. simultaneously conducting sweep trace G9, G11, transmit each other image data to each data line D3, the D6, the D9 that couple with sweep trace G9 and each data line D2, D5, the D8 that couples with sweep trace G11, corresponding pixel cell 300 receives and also stores respectively this image data.Follow the sweep trace of conducting simultaneously G10, G12, transmit each other image data to each data line D1, the D4, the D7 that couple with sweep trace G10 and each data line D3, D6, the D9 that couples with sweep trace G12, corresponding pixel cell 300 receives and also stores each image data.
The step of the 3rd embodiment of notion is as follows according to the present invention:
The sweep trace of conducting simultaneously G1, G3, G5, and the not conducting of sweep trace G2 at interval between sweep trace G1 and the sweep trace G3, the also not conducting of sweep trace G4 at interval between sweep trace G3 and the sweep trace G5, and sweep trace G1, G3, G5 are coupled to the different pieces of information line, in the present embodiment, sweep trace G1 is coupled to data line D1, D4, D7, and sweep trace G3 is coupled to data line D3, D6, D9, and sweep trace G5 is coupled to data line D2, D5, D8.
Transmit each data line D3, D6, D9 that each other image data couples to each data line D1, D4 of coupling with sweep trace G1, D7, with sweep trace G3 and each data line D2, D5, the D8 that couples with sweep trace G5.The corresponding pixel cell 300 of data line D1 to D9 receives and stores each image data.
Follow the sweep trace of conducting simultaneously G2, G4, G6, the then not conducting of sweep trace G3 at interval between sweep trace G2 and the sweep trace G4, the also not conducting of sweep trace G5 at interval between sweep trace G4 and the sweep trace G6, and sweep trace G2, G4, G6 are coupled to the different pieces of information line, in the present embodiment, sweep trace G2 is coupled to data line D2, D5, D8, and sweep trace G4 is coupled to data line D1, D4, D7, and sweep trace G6 is coupled to data line D3, D6, D9.
Transmit each data line D1, D4, D7 that each other image data couples to each data line D2, D5 of coupling with sweep trace G2, D8, with sweep trace G4 and each data line D3, D6, the D9 that couples with sweep trace G6.The corresponding pixel cell 300 of data line D1 to D9 receives and stores each image data.
The conducting order of sweep trace G7 to G12 is identical with the conducting order of above-mentioned sweep trace G1 to G6, i.e. simultaneously conducting sweep trace G7, G9, G11, transmit each data line D3, D6, D9 that each other image data couples to each data line D1, D4 of coupling with sweep trace G7, D7, with sweep trace G9 and each data line D2, D5, the D8 that couples with sweep trace G11, corresponding pixel cell 300 receives and also stores each image data.Follow the sweep trace of conducting simultaneously G8, G10, G12, transmit each data line D1,14, D7 that each other image data couples to each data line D2, D5 of coupling with sweep trace G8, D8, with sweep trace G10 and each data line D3, D6, the D9 that couples with sweep trace G12, corresponding pixel cell 300 receives and also stores each image data.
The sweep trace control timing figure and first embodiment of second embodiment and the 3rd embodiment are similar, and this repeats no more.
Comprehensive the foregoing description is in the multi-strip scanning of the conducting simultaneously line at least two according to the driving method of liquid crystal indicator of the present invention as can be known, makes the duration of charging increase at least two times and can increase the voltage saturation rate.In addition, the sweep trace of this while conducting is the not sweep trace of conducting simultaneously of interval at least one, can avoid the signal between the adjacent scanning lines to disturb, and causes the different problem of feedback voltage.At last, the neither identical purpose of the data line that sweep trace coupled of this while conducting is to avoid to have simultaneously the conducting simultaneously of multi-strip scanning line on same data line.For example among Fig. 3, when while conducting sweep trace G1, G4, G7, because these three sweep trace G1, G4, G7 all are coupled to data line D1, therefore the pixel cell 300 that these three sweep trace G1, G4, G7 and data line D1 are corresponding receives identical image data, promptly receive identical GTG display voltage, yet each pixel cell 300 required GTG display voltage may not be certain identical, can cause the gray scale voltage that receives and required gray scale voltage that error is arranged and the situation of color colour cast takes place.
The above only is preferred embodiment of the present invention, not in order to restriction the present invention, all any modifications of being done within the spirit and principles in the present invention, is equal to and replaces and improvement etc., all should be included within protection scope of the present invention.
Claims (9)
1. the driving method of a liquid crystal indicator, it is characterized in that, described liquid crystal indicator comprises multi-strip scanning line, many data lines and a plurality of pixel cell, and each pixel cell is to correspond to the one of described sweep trace and the one of described data line, and described driving method comprises:
At least two in the described sweep trace of conducting simultaneously, described at least two sweep traces are that at least one sweep trace and each described data line of coupling with each described at least two sweep trace of conducting simultaneously is neither not identical at interval; And
Transmit each other image data to each the described data line that couples with described at least two sweep traces.
2. driving method as claimed in claim 1 is characterized in that, described sweep trace and described data line are orthogonal settings.
3. driving method as claimed in claim 1 is characterized in that, when transmitting each other image data to each described data line of coupling with described at least two sweep traces, each corresponding pixel cell receives and also stores each image data.
4. driving method as claimed in claim 1 is characterized in that, is the scanning motion that utilizes an activation signal controlling one picture.
5. driving method as claimed in claim 4 is characterized in that, when described enable signal when the first accurate position becomes second accurate, utilize the edge-triggered of sweep frequency to start the initial pulse wave of scanning, at least two action in the described sweep trace of beginning conducting simultaneously.
6. driving method as claimed in claim 5 is characterized in that, the described first accurate position is a high levle, and the described second accurate position is a low level, and described edge-triggered triggers for negative edge.
7. as claim 1 a described driving method, it is characterized in that, is at least two that utilize in the described sweep trace of pulse signal conducting simultaneously.
8. driving method as claimed in claim 1 is characterized in that, in the time of at least three in the described sweep trace of while conducting, between described at least three sweep traces are adjacent at interval not the quantity of the sweep trace of conducting simultaneously be identical.
9. driving method as claimed in claim 1 is characterized in that, in the time of at least three in the described sweep trace of while conducting, between described at least three sweep traces are adjacent at interval not the quantity of the sweep trace of conducting simultaneously be difference.
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| CN 201010132888 CN102201205B (en) | 2010-03-23 | 2010-03-23 | Driving method of liquid crystal device |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101783128A (en) * | 2010-04-02 | 2010-07-21 | 福州华映视讯有限公司 | Method for driving liquid crystal display |
| CN103413532A (en) * | 2013-07-26 | 2013-11-27 | 京东方科技集团股份有限公司 | Pixel drive circuit, pixel drive method, array substrate and liquid display device |
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| CN101783128A (en) * | 2010-04-02 | 2010-07-21 | 福州华映视讯有限公司 | Method for driving liquid crystal display |
| CN101783128B (en) * | 2010-04-02 | 2012-08-08 | 福州华映视讯有限公司 | Method for driving liquid crystal display |
| CN103413532A (en) * | 2013-07-26 | 2013-11-27 | 京东方科技集团股份有限公司 | Pixel drive circuit, pixel drive method, array substrate and liquid display device |
| CN103413532B (en) * | 2013-07-26 | 2015-07-01 | 京东方科技集团股份有限公司 | Pixel drive circuit, pixel drive method, array substrate and liquid display device |
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Owner name: CPT TECHNOLOGY (GROUP) CO., LTD. Free format text: FORMER OWNER: CPT DISPLAY TECHNOLOGY SHENZHEN LTD. Effective date: 20130704 |
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Effective date of registration: 20130704 Address after: 350000, No. 6 West Road, Mawei District, Fujian, Fuzhou Patentee after: CPT DISPLAY TECHNOLOGY (SHENZHEN)CO., LTD. Patentee after: Chunghwa Picture Tubes Ltd. Address before: 518000, Guangming hi tech Industrial Park, Shenzhen, Guangdong, No. 9, Ming Tong Road, Baoan District Patentee before: CPT Display Technology Shenzhen Ltd. Patentee before: Chunghwa Picture Tubes Ltd. |