CN101388200B - Liquid crystal display device and driving method thereof - Google Patents
Liquid crystal display device and driving method thereof Download PDFInfo
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- CN101388200B CN101388200B CN2008102024467A CN200810202446A CN101388200B CN 101388200 B CN101388200 B CN 101388200B CN 2008102024467 A CN2008102024467 A CN 2008102024467A CN 200810202446 A CN200810202446 A CN 200810202446A CN 101388200 B CN101388200 B CN 101388200B
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Abstract
The invention discloses a liquid crystal display device and a driving method thereof, the liquid crystal display device comprises a liquid crystal display board and a backlight source, wherein the liquid crystal display board comprises multiple rows of pixels, each row of pixels is equipped with a concentration line which supplies common voltage, the backlight source comprises multiple columns oflamps, each column of lamps is equipped with a plurality of lamps, and the lamps can be respectively controlled. The liquid crystal display device and the driving method thereof find out the boundaryof a motion picture and respectively reduces a motion fuzzy phenomenon through using inserting black or scanning backlight for horizontal and vertical motion vector regions, the liquid crystal displaydevice and the driving method thereof effectively reduce the motion fuzzy phenomenon, and the whole brightness is not affected.
Description
Technical field
The present invention relates to a kind of liquid crystal indicator and driving method thereof, relate in particular to a kind of liquid crystal indicator and driving method thereof that prevents the motion blur phenomenon.
Background technology
Liquid crystal has the characteristic of double refractive inde, and under different electric fields, has different arrangement modes.Liquid crystal indicator utilizes liquid crystal light valve that transmittance is controlled, thus display image.Tradition liquid crystal indicator structure comprises as shown in Figure 1: LCD panel 10, and gate drivers 20 is used to drive the sweep trace GL of LCD panel 10; Data driver 30 is used to drive the data line DL of LCD panel 10; Timing controller 40 is used for control gate driver 20 and data driver 30; And the gray scale voltage generator 50 that the GTG signal is provided for data driver 30.
Liquid crystal indicator is a sampling maintenance display device, and the problem of existence is that the afterimage of previous frame has produced motion blur phenomenon (Motion Blur).In order to eliminate the motion blur phenomenon, the liquid crystal indicator of prior art mainly uses two kinds of technology, and a kind of is the driving method that inserts black data, and another is a scanning backlight.These two kinds of methods all are that whole image is carried out black plug, and are bigger to the overall brightness influence of display frame.
Summary of the invention
Technical matters to be solved by this invention provides a kind of liquid crystal indicator and driving method thereof, effectively alleviates the motion blur phenomenon, and does not influence overall brightness.
The present invention solves the problems of the technologies described above the driving method that the technical scheme that adopts provides a kind of liquid crystal indicator, and wherein, this liquid crystal indicator has black plug structure and scanning backlight structure, said method comprising the steps of:
A. providing two adjacent frame data to carry out motion vector judges;
B. if there is the horizontal zone motion vector, then corresponding line in this zone is inserted black data;
C. if there is a vertical area motion vector, then should the zone in respective column carry out scanning backlight;
D. if there is a global area motion vector, then the black plug that the borderline region of horizontal direction is carried out among the step b is handled, and the scanning backlight that the borderline region of vertical direction carries out among the step c is handled;
E. if there is not motion vector, then directly export.
The present invention also provides a kind of liquid crystal indicator that the local black insertion structure realizes above-mentioned driving method that has for solving the problems of the technologies described above, and comprising:
One LCD panel, described LCD panel is provided with the pixel that is matrix distribution, each pixel is driven by the first film transistor and second thin film transistor (TFT), each row pixel is provided with one first scan signal line and a concentric line, every adjacent two row pixels are provided with one second scan signal line, each row pixel is provided with a data signal line, described first scan signal line link to each other with described the first film transistor control pixel charge into from the data-signal on the data signal line, described second scan signal line link to each other with described second thin film transistor (TFT) control pixel charge into from the common electric voltage on the concentric line, described first scan signal line links to each other with the first sweep signal driver, described second scan signal line links to each other with the second sweep signal driver, and described concentric line links to each other with the concentric line driver;
One backlight, described backlight comprises the multiple row fluorescent tube, whenever shows many fluorescent tubes and forms, described many fluorescent tubes can be controlled respectively.
In the above-mentioned liquid crystal indicator, wherein, described fluorescent tube is U type CCFL fluorescent tube or barcode LED.
The present invention contrasts prior art following beneficial effect: the present invention finds out the border of moving image and adopts black plug or scanning backlight to alleviate the motion blur phenomenon to level with vertical motion vector zone respectively, thereby make and only in the zone on moving image border, carry out black plug or scanning backlight, and other regional brightness can not be lowered.
Description of drawings
Fig. 1 is the structural drawing of existing liquid crystal indicator.
Fig. 2 is the invention process process flow diagram.
Fig. 3 is the regional movement schematic vector diagram.
Fig. 4 is the vertical motion vector synoptic diagram.
Fig. 5 is the horizontal motion vector synoptic diagram.
Fig. 6 is the global motion vector synoptic diagram.
Fig. 7 is first kind of black plug structural representation of the present invention.
Fig. 8 is second kind of black plug structural representation of the present invention.
Fig. 9 is the drive signal synoptic diagram of Fig. 7 correspondence.
Figure 10 is the drive signal synoptic diagram of Fig. 8 correspondence.
Among the figure,
10 display panels, 20 gate drivers, 30 source electrode drivers
40 timing controllers, 50 gray scale voltage generators, 60 fluorescent tubes
70 horizontal motion vector, 80 vertical motion vectors
801 first sweep signal drivers, 802 concentric line drivers
803 second sweep signal drivers
Embodiment
The invention will be further described below in conjunction with drawings and Examples.
Fig. 2 is the invention process process flow diagram.The liquid crystal indicator that the present invention uses need have black plug structure and scanning backlight control structure.
See also Fig. 2, at first according to the former frame of image to display and the data of back one frame, judge whether to exist the regional movement vector of horizontal distribution, if there is the regional movement vector of level to exist, the zone to this level alleviates the motion blur phenomenon with regard to utilizing the method for inserting black data or grey data so; If there is not the regional movement vector of level to exist, continue so to judge whether to have vertical regional movement vector, if vertical motion vector is arranged, adopt the method for scanning backlight to alleviate the motion blur phenomenon to this vertical zone so; If there is not vertical regional movement vector to exist yet, continue to judge whether to exist the motion vector of the overall situation so, if there is the motion vector of the overall situation to exist, so the border of this global vector is found out, the zone at the place, border of horizontal direction is alleviated the motion blur phenomenon with the method for black plug, the zone at the place, border of vertical direction is alleviated the motion blur phenomenon with flicker method backlight.
Motion vector analysis mainly refers to the motion track direction of the moving object in the two dimensional image picture is carried out analytical estimating.Mainly contain two kinds of analytical approachs at present: 1) kinematic parameter and the three-dimensional structure information of finding the solution object according to adjacent two width of cloth of time or multiple image; 2) the optical flow analysis method of image sequence.By analyzing moving image, can obtain single order, second order and the three rank movable informations of object, whether decision carries out brightness enhancing and/or black plug then.
In order to carry out estimation effectively, need apply some constraint conditions to real motion, promptly to motion modeling.The two dimensional motion model can be divided into parameter model and nonparametric model roughly.Nonparametric model applies the smoothness constraint condition to sports ground, mainly comprises method based on light stream, based on the method for pixel, based on the method for piece coupling with based on the method for random field etc.In parameter model, object of which movement is modeled as certain projected forms, and estimation is exactly to estimate the parameter of mapping, for example overall motion estimation, based on the estimation in zone etc.
Wherein, the simplest motion is exactly to estimate each pixel motion vector, and this class model mainly contains based on light stream, based on pixel with based on the method for random field.In these methods, because kinematic parameter quantity is the twice of pixel count, kinematic parameter quantity is more, also must apply suitable smoothness constraint condition during estimation.In addition, block-based method has been widely used in the video coding because simple, and at this moment, video image is split into little regular piece, and the motion model of each piece is restricted to simple translation motion.
The present invention combines the same black plug of motion vector, scanning backlight, effectively alleviates the motion blur phenomenon, and does not influence overall brightness, is further described below in conjunction with accompanying drawing.
Fig. 3 has schematically provided regional motion vector, and zonal motion vector generally can be the literal of rolling or the football of motion etc., horizontal motion vector 70 shown in oval frame of broken lines inner region among the figure and vertical motion vector 80.
Fig. 4 shows the solution of the motion blur phenomenon of the regional movement vector that vertical direction distributes among the present invention, and the motion vector that vertical direction distributes adopts the method for scanning backlight to alleviate the motion blur phenomenon to this vertical zone so.The backlight of the liquid crystal indicator that uses among the present invention is CCFL fluorescent tube or barcode LED etc., its arrangement mode of U type CCFL fluorescent tube is to be divided into two row up and down in the example of the present invention, also can be divided into more multiple row, every row are made up of many fluorescent tubes, there is the regional movement vector of vertical distribution to exist if judge certain zone, as vertical motion vector 80 in the oval frame of broken lines among Fig. 4, then allow two fluorescent tubes 60 up and down backlight at this place, zone luminous in turn, and the fluorescent tube 60 on top finishes to the next frame picture charging beginning luminous in the charging of the pixel of first picture of present frame, the fluorescent tube 60 of bottom finishes to next frame picture the latter half charging beginning luminous in the charging of the pixel of second picture of present frame, so just can obtain the effect backlight of glimmering, thereby alleviate the motion blur phenomenon.
Fig. 5 shows the solution of the motion blur phenomenon of the regional movement vector that horizontal direction distributes among the present invention, the motion vector that horizontal direction distributes adopts the method for inserting black data or grey data to alleviate the motion blur phenomenon to this vertical zone so.There is the regional movement vector of horizontal distribution to exist if judge certain zone, as horizontal motion vector 70 in the oval frame of broken lines among Fig. 5, just can charge at present frame this regional pixel, shown half or more also can less time after, black data or grey data are inserted in this zone.
Fig. 6 shows the solution of the motion blur phenomenon of global motion vector among the present invention, at first global motion vector is decomposed into horizontal motion vector 70 and vertical motion vector 80, adopt the method for inserting black data or grey data to alleviate the motion blur phenomenon to horizontal motion vector 70, adopt the method for scanning backlight to alleviate the motion blur phenomenon vertical motion vector 80.
The liquid crystal indicator that the present invention uses is with reference to figure 1 and Fig. 8, comprise display panels 10, be connected in the first sweep signal driver 801 and the data driver 30 of display panels 10, be connected in the gray scale voltage generator 50 of data driver 30, and the timing controller 40 that is used to control described parts.In addition, the liquid crystal indicator of the present invention's use also comprises the concentric line driver 802 and the second sweep signal driver 803.
The first method of inserting black data or grey data among the present invention as shown in Figure 7, liquid crystal cell matrix P (n) comprising: the sweep trace G_n of first group of sweep signal and the sweep trace GB_n/2 of second group of sweep signal are provided; The data line D_n of data-signal is provided; The concentric line Cst_Line_n of common electric voltage is provided; The first film transistor T FT-n_1 grid is connected to the sweep trace G_n of first group of sweep signal, and source electrode is connected to data line D_n, and drain electrode is connected to the pixel electrode of liquid crystal mesogens cell matrix P (n); The second thin film transistor (TFT) TFT-n_1A grid is connected to the sweep trace GB_n/2 of second group of sweep signal, and source electrode is connected to provides the concentric line of common electric voltage Cst_Line_n, and drain electrode is connected to the pixel electrode of liquid crystal cell matrix P (n); Same liquid crystal cell matrix P (n+1) comprising: the sweep trace G_n+1 of first group of sweep signal and the sweep trace GB_n/2 of second group of sweep signal are provided; The data line D_n of data-signal is provided; The Cst_Line_n+1 of common electric voltage is provided; The first film transistor T FT-n+1_1 grid is connected to the sweep trace G_n+1 of first group of sweep signal, and source electrode is connected to data line D_n, and drain electrode is connected to the pixel electrode of liquid crystal cell matrix P (n+1); The second thin film transistor (TFT) TFT-n+1_1A grid is connected to the sweep trace GB_n/2 of second group of sweep signal, and source electrode is connected to provides the concentric line of common electric voltage Cst_Line_n+1, and drain electrode is connected to the pixel electrode of liquid crystal cell matrix P (n+1).
With reference to first kind of drive principle of inserting black data or grey data method of Fig. 7 embodiment of the invention.When the sweep trace G_n that gives first group of sweep signal applied as shown in Figure 9 high level voltage, pixel electrode P (n) was charged into the view data from data line D_n; By that analogy, equally also be fit to P (n+1) and wait other pixels.When the sweep trace of first group of sweep signal scans a half, when just the n/2 velamen of first group of sweep signal applies high level voltage, the signal-line driving circuit of second group of sweep signal begins to begin drive signal line from signal wire GB_1, whether this second group of scan signal line of judging before the basis is in the zone that needs insert black data or grey data earlier, if GB_1 is in the zone that needs to insert black data or grey data, so just GB_1 is applied as shown in Figure 9 high level voltage, its cycle roughly is the twice of G_1, this moment, TFT-1_1A and TFT-2_1A opened simultaneously, the two row pixels at P (1) and P (2) place are written into black data or grey data, if this second group of scan signal line is not in the zone that needs to insert black data or grey data, this second group of scan signal line applies low level voltage in the cycle during this period of time so, like this two of P (1) and P (2) place row pixels just are not written into black data or grey data, by that analogy, other second group of scan signal line so just realized only needs being inserted the zone insertion black data or the grey data of black data or grey data too.
The second method of inserting black data or grey data among the present invention as shown in Figure 8, liquid crystal cell matrix P (n) comprising: the sweep trace G_n of first group of sweep signal and the sweep trace GB_n/2 of second group of sweep signal are provided; The data line D_n of data-signal is provided; The concentric line Cst_Line_n of common electric voltage is provided; The first film transistor T FT-n+1_1A grid is connected to the sweep trace G_n+1 of first group of sweep signal, and source electrode is connected to data line D_n, and drain electrode is connected to the pixel electrode of liquid crystal mesogens cell matrix P (n); The second thin film transistor (TFT) TFT-n+1_1B grid is connected to the sweep trace GB_n/2+1 of second group of sweep signal, and source electrode is connected to provides the concentric line of common electric voltage Cst_Line_n, and drain electrode is connected to the pixel electrode of liquid crystal cell matrix P (n+1); Same liquid crystal cell matrix P (n+1) comprising: the sweep trace G_n+1 of first group of sweep signal and the sweep trace GB_n/2 of second group of sweep signal are provided; The data line D_n of data-signal is provided; The concentric line Cst_Line_n+1 of common electric voltage is provided; The first film transistor T FT-n+1_1 grid is connected to the sweep trace G_n+1 of first group of sweep signal, and source electrode is connected to data line D_n, and drain electrode is connected to the pixel electrode of liquid crystal mesogens cell matrix P (n+1); The second thin film transistor (TFT) TFT-n+1_1A grid is connected to the sweep trace GB_n/2 of second group of sweep signal, and source electrode is connected to provides the concentric line of common electric voltage Cst_Line_n+1, and drain electrode is connected to the pixel electrode of liquid crystal cell matrix P (n+1).
With reference to first kind of drive principle of inserting black data or grey data method of Fig. 8 embodiment of the invention.When the sweep trace G_n+1 that gives first group of sweep signal applied as shown in figure 10 high level voltage, pixel electrode P (n+1) was charged into the view data from data line D_n; When the sweep trace G_n+2 that gives first group of sweep signal applied as shown in figure 10 high level voltage, pixel electrode P (n+2) was charged into the view data from data line D_n, and P (n+3) quilt is charged into black data or grey data simultaneously; When the sweep trace G_n+3 that gives first group of sweep signal applies as shown in figure 10 high level voltage, pixel electrode P (n+3) is charged into the view data from data line D_n, because the time that the black data of P (n+3) or grey data continue is very short, can not impact demonstration; By that analogy, equally also be fit to P (n+4) and wait other pixels.When the sweep trace of first group of sweep signal scans a half, when just the n/2 velamen of first group of sweep signal applies high level voltage, the even-line interlace line drive circuit of the signal wire of first group of sweep signal and second group of scan signal line drive circuit begin to begin drive signal line from signal wire G_2 and GB_1, whether judge this first group of even-line interlace signal wire and the second group of scan signal line before the basis is in the zone that needs insert black data or grey data earlier, if G2 and GB_1 are in the zone that needs to insert black data or grey data, so earlier G2 is applied as shown in figure 10 high level voltage, the cycle G_1 that makes peace greatly is identical, this moment, TFT-2_1B and TFT-2_1A opened simultaneously, P (3) pixel of being expert at is written into black data or grey data, and P (2) is expert at and is written into wrong data; Again GB_1 is applied as shown in figure 10 high level voltage, its cycle G_1 that makes peace greatly is identical, this moment, TFT-2_1B and TFT-2_1A opened simultaneously, P (2) pixel of being expert at is written into black data or grey data, because the time that the black data of P (2) or grey data continue is very short, can not impact demonstration, P (1) can be the Dummy pixel herein; If be not in the zone that needs to insert black data or grey data at this first group of even-line interlace signal wire and second group of scan signal line then, this second group of scan signal line applies low level voltage in the cycle during this period of time so, like this two of P (3) and P (2) place row pixels just are not written into black data or grey data, by that analogy, other second group of scan signal line so just realized only needs being inserted the zone insertion black data or the grey data of black data or grey data too.
As mentioned above, the present invention alleviates the motion blur phenomenon to the horizontal motion vector zone with regard to utilizing the method for inserting black data or grey data, adopts the method for scanning backlight to alleviate the motion blur phenomenon to the vertical motion vector zone.Certainly, the present invention also can adopt the method for scanning backlight to alleviate the motion blur phenomenon to the horizontal motion vector zone, and utilizes the method for inserting black data or grey data to alleviate the motion blur phenomenon to the vertical motion vector zone.
Though the present invention discloses as above with preferred embodiment; right its is not in order to qualification the present invention, any those skilled in the art, without departing from the spirit and scope of the present invention; when can doing a little modification and perfect, so protection scope of the present invention is when with being as the criterion that claims were defined.
Claims (3)
1. the driving method of a liquid crystal indicator, this liquid crystal indicator has black plug structure and scanning backlight structure, it is characterized in that, said method comprising the steps of:
A. providing two adjacent frame data to carry out motion vector judges;
B. if there is the horizontal zone motion vector, then corresponding line in this zone is inserted black data;
C. if there is the vertical area motion vector, then respective column in this zone is carried out scanning backlight;
D. if there is a global area motion vector, then the black plug that the borderline region of horizontal direction is carried out among the step b is handled, and the scanning backlight that the borderline region of vertical direction carries out among the step c is handled;
E. if there is not motion vector, then directly export.
2. a liquid crystal indicator of realizing the described driving method of claim 1 is characterized in that, described liquid crystal indicator comprises:
One LCD panel, described LCD panel is provided with the pixel that is matrix distribution, each pixel is driven by the first film transistor and second thin film transistor (TFT), each row pixel is provided with one first scan signal line and a concentric line, every adjacent two row pixels are provided with one second scan signal line, each row pixel is provided with a data signal line, described first scan signal line link to each other with described the first film transistor control pixel charge into from the data-signal on the data signal line, described second scan signal line link to each other with described second thin film transistor (TFT) control pixel charge into from the common electric voltage on the concentric line, described first scan signal line links to each other with the first sweep signal driver, described second scan signal line links to each other with the second sweep signal driver, and described concentric line links to each other with the concentric line driver;
One backlight, described backlight comprises the multiple row fluorescent tube, whenever shows many fluorescent tubes and forms, described many fluorescent tubes can be controlled respectively.
3. a liquid crystal indicator as claimed in claim 2 is characterized in that, described fluorescent tube is U type CCFL fluorescent tube or barcode LED.
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| KR101751998B1 (en) * | 2010-07-22 | 2017-06-28 | 엘지디스플레이 주식회사 | Organic Light Emitting Diode Display And Driving Method Thereof |
| CN102333200A (en) * | 2011-10-28 | 2012-01-25 | 冠捷显示科技（厦门）有限公司 | Method for realizing image motion compensation of liquid crystal television by utilizing two-dimensional light-emitting diode (LED) local dimming technology |
| CN112198721A (en) * | 2020-10-29 | 2021-01-08 | Tcl华星光电技术有限公司 | Backlight module and display device |
| TWI753690B (en) * | 2020-12-08 | 2022-01-21 | 奇景光電股份有限公司 | Image display system |
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