CN102201205B - Driving method of liquid crystal device - Google Patents
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- CN102201205B CN102201205B CN 201010132888 CN201010132888A CN102201205B CN 102201205 B CN102201205 B CN 102201205B CN 201010132888 CN201010132888 CN 201010132888 CN 201010132888 A CN201010132888 A CN 201010132888A CN 102201205 B CN102201205 B CN 102201205B
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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 is a plurality of pixel cells that matrix is arranged.Each pixel cell is to be controlled with show image by the 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 a sweep trace of conducting, the data line that each pixel cell can be corresponding with it on this sweep trace at this moment connects and receives image data, and each pixel cell can be charged to suitable voltage.Then make this sweep trace become the state of not conducting, until just can again receive image data during next conducting, then conducting time sweep trace repeats above-mentioned steps to receive image data again.
The drive principle of look order 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, therefore the reaction time of liquid crystal wants fast.Seeing also Fig. 1, is the sequential chart that illustrates look order method.Look order method can be divided into three parts according to the time axis' control.First part is the thin film transistor (TFT) of each pixel cell of conducting and the time T of charging
TFTThe second part is that liquid crystal is subjected to voltage rotation that thin film transistor (TFT) applies to expecting the time T of shade of gray
LCThe 3rd part is after the liquid crystal rotation is complete, the time T of red (R) backlight of quickflashing
BL, only finish the image of 1/3 picture (1/3Frame) this moment.Then repeat aforesaid way and finish again respectively the driving of green (G) backlight and blue (B) backlight, to finish the colour picture of 1 image time (Frame Time).Owing to need to sequentially utilize red, blue, green three looks to make the color that temporal switching reaches required demonstration, therefore during with look order 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 order 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, therefore simultaneously conducting multi-strip scanning line is the two or three sweep trace for example, to increase the duration of charging as twice or three times, make 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 next time frame update, each pixel cell comprises the voltage that a storage capacitors (Storage Capacitor, Cs) is finished in order to store this charging.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 to increases an extra common cabling as the Cs self, so its aperture opening ratio (Aperture Ratio) is larger, so mostly use now Cs to be positioned at the framework of lock mo(u)ld top half.
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, both voltage differences of moment that storage capacitors CS never is conducting to conducting at sweep trace 102 can be subject to the impact of sweep trace 102 and sweep trace 106 (being last sweep trace), and this voltage differences is called feedback (Feedthrough) voltage.
As mentioned above, for solving the situation of undercharge, need for example three sweep traces of simultaneously conducting multi-strip scanning 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 produces the in vain black or white phenomenon of black and white take three for unit 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 subject to the impact 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 different from 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 to 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 order 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 sweep trace and each described data line of coupling with each described at least two sweep trace of simultaneously conducting is neither not identical at interval at least one; And
Transmit each other image data to each the described data line that couples with described at least two sweep traces;
In the time of at least three in the described sweep trace of while conducting, between described at least three sweep traces are adjacent the institute interval not the quantity of the sweep trace of simultaneously conducting be identical or different.
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 the sweep trace of simultaneously conducting not of interval at least one between the multi-strip scanning line of simultaneously conducting multi-strip scanning line and at the same time conducting.Moreover the data line that the multi-strip scanning line of simultaneously conducting couples is neither identically then can avoid having on the same data line the simultaneously conducting 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 order 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 sequential chart that the embodiment of the invention provides.
Embodiment
In order to make purpose of the present invention, technical scheme and beneficial effect clearer, below in conjunction with drawings and Examples, the present invention is further elaborated.Should be appreciated that specific embodiment described herein only in order to explain the present invention, is not intended to limit 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 simultaneously conducting of interval at least one, the impact that the sweep trace that prevents simultaneously continuously conducting is subject to last sweep trace causes feedback voltage different, 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 the first embodiment, the step of this driving method is as follows:
Simultaneously conducting sweep trace 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, the 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 simultaneously conducting sweep trace 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, the 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 again simultaneously conducting sweep trace G3, G7, G11, 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, the 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.
Last simultaneously conducting sweep trace 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, the 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, take while conducting three sweep trace G1, G5, G9 as example, 3 at the interval sweep trace of simultaneously conducting not between sweep trace G1 and the sweep trace G5, also 3 at the interval sweep trace of simultaneously conducting not between sweep trace G5 and the sweep trace G9, in other embodiments, between sweep trace G1 and the sweep trace G5 institute interval not the sweep trace of simultaneously conducting quantity 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 sequential chart 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 namely when enable signal OE was high levle, sweep trace G1 to G12 can not be switched on.This enable signal OE refers to show 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, at first simultaneously conducting sweep trace G1, G5, G9, until second negative edge of sweep frequency (Gate Clock) is when being triggered, make sweep trace G1, G5, G9 becomes not conducting and simultaneously conducting sweep trace 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 simultaneously conducting sweep trace 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 simultaneously conducting sweep trace G4, G8, G12, finish the scanning of a picture, the scanning that so goes round and begins again.
The step of the second embodiment of concept is as follows according to the present invention:
Simultaneously conducting sweep trace G1, G3, the then not conducting of sweep trace G2 at interval 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 simultaneously conducting sweep trace 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 simultaneously conducting sweep trace 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 concept is as follows according to the present invention:
Simultaneously conducting sweep trace 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, the 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 simultaneously conducting sweep trace 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, the 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, the 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 simultaneously conducting sweep trace G8, G10, G12, transmit each data line D1, D4, the 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.
Sweep trace control sequential chart and the first embodiment of the second embodiment and the 3rd embodiment are similar, and this repeats no more.
Comprehensive above-described embodiment is in the simultaneously conducting multi-strip scanning 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 simultaneously conducting 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 data line that couples of the sweep trace of this while conducting is to avoid at the same data line the simultaneously conducting of multi-strip scanning line is arranged simultaneously.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, namely receive identical GTG and show voltage, yet each pixel cell 300 required GTGs show that voltages 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 occurs.
The above only is preferred embodiment of the present invention, not in order to limiting the present invention, all any modifications of doing 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 (7)
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 sweep trace and each described data line of coupling with each described at least two sweep trace of simultaneously conducting is neither not identical at interval at least one; And
Transmit each other image data to each the described data line that couples with described at least two sweep traces;
In the time of at least three in the described sweep trace of while conducting, between described at least three sweep traces are adjacent the institute interval not the quantity of the sweep trace of simultaneously conducting be identical or different.
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 becomes the second level from the first level, utilizes the edge-triggered of sweep frequency to start the initial pulse wave of scanning, at least two action in the described sweep trace of simultaneously conducting of beginning.
6. driving method as claimed in claim 5 is characterized in that, described the first level is high levle, and described the second level is low level, and described edge-triggered triggers for negative edge.
7. such as claim 1 a described driving method, it is characterized in that, is at least two that utilize in the described sweep trace of simultaneously conducting of pulse signal.
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| CN101783128B (en) * | 2010-04-02 | 2012-08-08 | 福州华映视讯有限公司 | Method for driving liquid crystal display |
| 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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| CN1456930A (en) * | 2002-05-10 | 2003-11-19 | 阿尔卑斯电气株式会社 | Liquid crystal display device for reducing row creep |
| CN1841148A (en) * | 2005-03-31 | 2006-10-04 | Nec液晶技术株式会社 | Active-matrix bistable display device |
| WO2009084331A1 (en) * | 2007-12-27 | 2009-07-09 | Sharp Kabushiki Kaisha | Liquid crystal display, liquid crystal display driving method, and television receiver |
| WO2009084332A1 (en) * | 2007-12-27 | 2009-07-09 | Sharp Kabushiki Kaisha | Liquid crystal display, liquid crystal display driving method, and television receiver |
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| CN1456930A (en) * | 2002-05-10 | 2003-11-19 | 阿尔卑斯电气株式会社 | Liquid crystal display device for reducing row creep |
| CN1841148A (en) * | 2005-03-31 | 2006-10-04 | Nec液晶技术株式会社 | Active-matrix bistable display device |
| WO2009084331A1 (en) * | 2007-12-27 | 2009-07-09 | Sharp Kabushiki Kaisha | Liquid crystal display, liquid crystal display driving method, and television receiver |
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