CN101127197A - Liquid crystal display device and its driving method - Google Patents
Liquid crystal display device and its driving method Download PDFInfo
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- CN101127197A CN101127197A CNA2006101155768A CN200610115576A CN101127197A CN 101127197 A CN101127197 A CN 101127197A CN A2006101155768 A CNA2006101155768 A CN A2006101155768A CN 200610115576 A CN200610115576 A CN 200610115576A CN 101127197 A CN101127197 A CN 101127197A
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Abstract
The utility model discloses an LCD and a driving method for the LCD, which comprises a liquid crystal display panel and a scanning backlight module group; wherein, the liquid crystal display panel has a plurality of pixels and the scanning backlight module group comprises a plurality of luminous elements. First, one of the luminous elements is driven periodically with the period of one picture time. Then, the luminous elements are driven and made to achieve the highest backlight brightness at a first time. Finally, over driving voltage is input to the pixels of the LCD corresponding to the luminous elements; the pixels are driven by the over driving voltage to achieve the termination of the charge time at a second time so that the pixels transform from a beginning picture brightness to a target picture brightness at a third time. The first time, the second time and the third time are three different time points. By properly adjusting the over driving data in the scanning over driving lookup table to improve the smear phenomena and the double edge phenomena; thereby, the LCD has the advantages of better image performance and improved video response time.
Description
Technical field
The invention relates to a kind of Liquid Crystal Display And Method For Driving, and particularly relevant for a kind of Liquid Crystal Display And Method For Driving that improves the smear phenomenon.
Background technology
When the dynamic image on the LCD changed, human eye will be because of persistence of vision, and thought that the situation that image produces smear produces.In order to improve this kind situation, industry is many with dynamic image response curve (MotionPicture Response Curve, MPRC), blurred width (Blur Edge Width, BEW) and dynamic response time (Motion Picture Response Time MPRT) assesses the improvement degree of smear phenomenon.
Please be simultaneously with reference to Figure 1A and Figure 1B, Figure 1A is the display frame of LCD.Figure 1B is the dynamic image response curve of corresponding Figure 1A.Dynamic image response curve MPRC is the brightness distribution curve at animation edge, and when dynamic image response curve MPRC was steep more, expression animation edge was clear more, and the image performance is preferable.On the contrary, when dynamic image response curve MPRC was mild more, expression animation edge was fuzzy more, and the image performance is relatively poor.
Blurred width BEW means among the dynamic image response curve MPRC, when LCD reaches 10% to 90% brightness, and the number of pixels of its corresponding gray scale variation.Blurred width BEW is narrow more, represents the animation edge clear more.On the contrary, wide more as blurred width BEW, represent the animation edge fuzzy more.
Dynamic response time MPRT system is average with getting each rank after the translational speed V normalization of above-mentioned blurred width BEW to animation, is multiplied by the image time of LCD again.Change speech, dynamic response time MPRT=N-BEW * image time t
f(Frame Time), and N-BEW=blurred width BEW/ translational speed V.If dynamic response time MPRT is more little, the expression animate is good more.On the contrary, if dynamic response time MPRT is big more, the expression animate is poor more.
Yet the module backlight of conventional liquid crystal is fixed module backlight, and its backlight illumination can not glimmer or change in time and periodically.Therefore, behind above-mentioned dynamic image response curve MPRC, blurred width BEW and three parameter evaluations of dynamic response time MPRT, will find that its smear phenomenon can't effectively improve.
Summary of the invention
In view of this, purpose of the present invention is to provide a kind of Liquid Crystal Display And Method For Driving exactly.By the time that lights and the suitable overdrive voltage that inputs to pixel of adjusting of control module backlight, so that LCD manifests better animation quality.
According to first purpose of the present invention, a kind of driving method of LCD is proposed.LCD comprises display panels and scanning backlight module, and the scanning backlight module comprises a plurality of light-emitting components.Driving method comprises the steps: that at first periodically one of driven light-emitting element, and its cycle is a picture (Frame is also referred to as " the frame ") time.Then, driven light-emitting element and make it reach maximum backlight illumination in the very first time.At last, the input overdrive voltage is to the pixel of display panels, pixel is corresponding to aforesaid light-emitting component, overdrive voltage drives pixel and reaches the duration of charging terminating point in second time, make pixel in the 3rd time just by the start picture brightness transition to target picture brightness, and the very first time, second time and the 3rd time are inequality.
According to second purpose of the present invention, a kind of LCD is proposed.LCD comprises display panels, module backlight, storage element and driving circuit.Display panels has a plurality of pixels and module backlight comprises a plurality of light-emitting components.And storage element has fixed excessive driving look-up table and scan-type excessively drives look-up table.Driving circuit optionally excessively drives look-up table output overdrive voltage to pixel according to fixed excessive driving look-up table or scan-type according to the kind of module backlight.
When module backlight was the scanning backlight module, LCD made light-emitting component reach maximum backlight illumination in the very first time with one of cycle driven light-emitting element of an image time.And driving circuit output overdrive voltage is to pixel, and pixel is corresponding to light-emitting component, make pixel in the 3rd time just by the start picture brightness transition to target picture brightness, and the very first time, second time and the 3rd time are inequality.
Description of drawings
For purpose of the present invention, feature and advantage can be become apparent, below especially exemplified by a preferred embodiment, and cooperate appended graphicly, be described in detail below:
Figure 1A is the display frame of LCD.
Figure 1B is the dynamic image response curve of corresponding Figure 1A.
Fig. 2 and Figure 3 shows that synoptic diagram according to a kind of LCD of a preferred embodiment of the present invention.
Fig. 4 A and Fig. 4 B are depicted as the synoptic diagram that GTG that low GTG value changes to the high gray value switches the curve backlight of curve and scanning backlight module.
Fig. 5 A and Fig. 5 B are depicted as the high gray value and change to the synoptic diagram that the GTG that hangs down the GTG value switches the curve backlight of curve and scanning backlight module.
Figure 6 shows that backlight illumination curve, picture brightness curve and GTG when the driving frequency of module backlight and pixel is identical switch curve map.
Shown in Figure 7 is the asynchronous backlight illumination curve of driving frequency, picture brightness curve and the GTG switching curve map of module backlight and pixel.
Figure 8 shows that a kind of backlight liquid crystal display brightness curve and GTG according to a preferred embodiment of the present invention switch curve map.
Figure 9 shows that the picture brightness curve map of pixel.
Figure 10 shows that the picture brightness curve map of the design of first kind of excessive driving data.
Figure 11 shows that the picture brightness curve map of the design of second kind of excessive driving data.
Figure 12 shows that the picture brightness curve map of the design of the third excessive driving data.
Figure 13 shows that the picture brightness curve map of the design of the 4th kind of excessive driving data.
Figure 14 shows that the arrange in pairs or groups dynamic image response curve of fixed excessive driving look-up table of scanning backlight module.
Figure 15 shows that scanning backlight module collocation scan-type excessively drives the dynamic image response curve of look-up table.
Figure 16 shows that a kind of driving method of LCD.
Main element symbol description among the figure:
20: LCD; 210: display panels; 212: pixel;
220: module backlight; 222: light-emitting component; 230: storage element;
240: driving circuit; 310,410,510: GTG switches curve;
320,520: the backlight illumination curve; 910,920: GTG switching place.
Embodiment
The present invention is for effectively improving the smear phenomenon that is produced when dynamic image changes, by lighting the time of suitable control module backlight, and the corresponding excessive driving data that excessively drives in the look-up table of adjusting, input to the overdrive voltage of pixel with change, make LCD that better picture performance can be arranged.
Please refer to Fig. 2 and Fig. 3, it illustrates and is the synoptic diagram according to a kind of LCD of a preferred embodiment of the present invention.LCD 20 comprises display panels 210, module backlight 220, storage element 230 and driving circuit 240.Display panels 210 comprises a plurality of pixels 212, and module 220 backlight also comprises a plurality of light-emitting components 222, light-emitting component 222 for example be the cold cathode fluorescent lamp pipe (Cold CathodeFluorescent Lamp, CCFL) or light-emittingdiode (Light Emitting Diode, LED).Storage element 230 for example is a memory body, and storage element 230 has fixed excessive driving look-up table LUTh and scan-type excessively drives look-up table LUTs.Kind difference according to module 220 backlight, driving circuit 240 will be optionally excessively drives excessive driving data OD among the look-up table LUTs according to fixed excessive driving look-up table LUTh or scan-type, to pixel 212, make LCD 20 with output overdrive voltage OV at an image time t
fIn (Frame Time), reach desired picture brightness.
When module 220 backlight is the scanning backlight module, LCD 20 periodically driven light-emitting element 222 one of them, and output overdrive voltage OV is to pixel 212, and pixel 212 corresponds to light-emitting component 222.The cycle of LCD 20 driven light-emitting element 222 is an image time, for instance, if LCD 20 needs to show 60 pictures in 1 second, then its image time is 1/60 second, and LCD 20 is promptly with 1/60 second cycle driven light-emitting element 222.Therefore, the backlight illumination of module 220 backlight is incited somebody to action in time and the light and shade alternate, to form a backlight illumination curve.In addition, when LCD 20 desires to change to the second GTG value by the first GTG value, its GTG value will form a GTG in time and switch curve.By the reciprocation of backlight illumination curve and GTG switching curve, to form the picture brightness curve of LCD.
(Blur Edge Width BEW), changes the smear phenomenon that is produced to solve dynamic image in order effectively to improve blurred width.By the phase place of suitable adjustment GTG switching curve and backlight illumination curve, will make the blurred width BEW of LCD 20 reach minimum.
Please be simultaneously with reference to Fig. 4 A and Fig. 4 B, it illustrates the synoptic diagram that the GTG that changes to the high gray value for low GTG value switches the curve backlight of curve and scanning backlight module.For instance, when the driving frequency of module 220 backlight and pixel 212 is identical (as be all 60Hz or be all 120Hz), the signal switching point SW1 that switches on the curve 310 with GTG puts t1 (shown in Fig. 4 A) reference time with the crest BL place of coincidence on the backlight illumination curve 320.Reach crest BL (shown in Fig. 4 B) when adjusting backlight illumination curve 320 in after a while time point t2, then the blurred width BEW that changes to the high gray value by low GTG value will reach minimum.If the image time of this moment is 1/60 second, and low GTG value is 0, and the high gray value is 255, then time point t2 puts 3ms place behind the t1 reference time.
Please be simultaneously with reference to Fig. 5 A and Fig. 5 B, it illustrates the synoptic diagram that the GTG that changes to low GTG value for the high gray value switches the curve backlight of curve and scanning backlight module.Similarly, when the driving frequency of module 220 backlight and pixel 212 is identical (as be all 60Hz or be all 120Hz), the signal switching point SW2 that switches on the curve 410 with GTG puts t1 (shown in Fig. 5 A) reference time with the crest BL place of coincidence on the backlight illumination curve 320.When adjusting backlight illumination curve 320, reach crest BL (shown in Fig. 5 B), then change to the blurred width BEW that hangs down the GTG value and will reach minimum by the high gray value in time point t3.If the image time of this moment is 1/60 second, and low GTG value is 0, and the high gray value is 255, then time point t3 puts 4ms place before the t1 reference time.
Two kinds of situations that the aforesaid GTG value of comprehensive consideration rises and the GTG value descends.When if the driving frequency of module 220 backlight and pixel 212 is identical, by putting t1 reference time toward reach a period of time, then the blurred width BEW of LCD 20 integral body will reach minimum by the time point that backlight illumination curve 320 is reached crest BL.
Please refer to Fig. 6, it illustrates driving frequency into module backlight and pixel backlight illumination curve, picture brightness curve and the GTG when identical and switches curve map.In order to reduce blurred width BEW, when the driving frequency of module 220 backlight and pixel 212 is identical (as be all 60Hz or be all 120Hz), the backlight illumination curve 520 that needs to adjust LCD 20 makes it be ahead of GTG to switch curve 510.
In other words, when time t4, make module 220 backlight reach maximum backlight illumination w, maximum backlight illumination w is the crest of backlight illumination curve 520.And when time t5, overdrive voltage OV drives pixel 212 and reaches duration of charging terminating point k, and duration of charging terminating point k is the crest that GTG switches curve 510.Make pixel 212 when time t6, picture brightness curve 530 just is converted to target picture brightness FL2 by start picture brightness FL1.
The difference value of time t5 and time t4 is a schedule time t
P1,, need design schedule time t if desire to make the blurred width BEW of LCD 20 integral body will reach minimum
P1=0%～25% * image time t
fFor instance, as image time t
fWhen being 1/60 second, if schedule time t
P1=0～1/240 second, then the blurred width BEW of LCD 20 will reach minimum, to improve the smear phenomenon.
Please refer to Fig. 7, it illustrates and is the asynchronous backlight illumination curve of the driving frequency of module backlight and pixel, picture brightness curve and GTG switching curve map.On the contrary, when the driving frequency of module backlight 220 and pixel 212 not simultaneously, the driving frequency of module 220 for example backlight is 60Hz, and the driving frequency of pixel 212 is 120Hz.Because the driving frequency f of module 220 backlight
BLUDriving frequency f less than pixel 212
LC, therefore, in order to reduce the blurred width BEW of LCD 20, the phase place that needs to adjust backlight illumination curve 520 makes it lag behind GTG switching curve 510.
In other words, when time t8, module 220 backlight reaches maximum backlight illumination w, and maximum backlight illumination w is the crest of backlight illumination curve 520.And when time t7, overdrive voltage OV drives pixel 212 and reaches duration of charging terminating point k, and duration of charging terminating point k is the crest that GTG switches curve 510.Make pixel 212 when time t9, picture brightness curve 530 just is converted to target picture brightness FL2 by start picture brightness FL1.
The difference value of time t7 and time t8 is a schedule time t
P2,, need design schedule time t if desire to make the blurred width BEW of LCD 20 integral body will reach minimum
P2=0%～(1-f
BLU/ f
Lc), promptly when the driving frequency of module 220 backlight be 60Hz, and the driving frequency of pixel 212 is when being 120Hz, schedule time t
P2=0%～50% * image time t
fFor instance, as image time t
fWhen being 1/60 second, if schedule time t
P2=0～1/120 second, then the blurred width BEW of LCD 20 will reach minimum, to improve the smear phenomenon.
Please refer to Fig. 8, it illustrates and is a kind of backlight liquid crystal display brightness curve and GTG switching curve map according to a preferred embodiment of the present invention.As previously mentioned, LCD 20 makes that through suitably adjusting the phase place of backlight illumination curve backlight illumination curve 520 and GTG switching curve 510 will be as shown in Figure 9.
Please refer to Fig. 9, it illustrates the picture brightness curve map into pixel.Driving circuit 240 excessively drives look-up table LUTs output overdrive voltage OV to pixel 212 according to scan-type, to reverse the angle of liquid crystal molecule in the pixel 212, and see through the light that module 220 backlight is produced, make the picture brightness of pixel 212 form picture brightness curve 530 in time.In other words, promptly see through backlight illumination curve 520 and GTG and switch the reciprocation of curve 510 to form picture brightness curve 530.Picture brightness curve 530 forms a plurality of picture brightness pulses in regular turn, and in a stable state after the time, the crest value of picture brightness pulse will equal a desired value g in fact, and then crest value is that the picture brightness pulse of desired value g promptly is called the target picture bright pulse.
As previously mentioned, LCD 20 is excessively to drive excessive driving data OD among the look-up table LUTs according to scan-type, and OV drives pixel 212 with the output overdrive voltage.And when time t10, reach target picture brightness FL2.Therefore, can reach aforementioned requirement for making LCD 20, the design scan-type excessively drives the excessive driving data OD among the look-up table LUTs relatively, makes LCD 20 when time t10, reaches target picture brightness FL2.Now will narrate the design of four kinds of excessive driving data respectively after, so that LCD 20 reaches desired picture brightness in an image time.
Please refer to Figure 10, it illustrates the picture brightness curve map of the design that is first kind of excessive driving data.LCD 20 excessively drives excessive driving data OD among the look-up table LUTs according to scan-type, overdrive voltage OV with output, excessively the design of driving data OD need make the picture brightness curve the crest value a of first picture brightness pulse Pa more than or equal to 90% of the crest value g of target picture bright pulse Pg, and crest value a needs smaller or equal to 110% of desired value g.Change speech, i.e. 0.9g≤a≤1.1g.
Please refer to Figure 11, it is depicted as the picture brightness curve map of the design of second kind of excessive driving data.In addition, because overshoot (Overshoot) characteristic of liquid crystal molecule makes that the crest value c of second picture brightness pulse Pc will be greater than the crest value a of first picture brightness pulse Pa.Therefore,, make its 0.9g≤a≤1.1g,, will make LCD 20 have better picture performance the suitable restriction of crest value c of second picture brightness pulse Pc except limiting first picture brightness pulse Pa.So excessively the design of driving data OD need make the crest value c of second picture brightness pulse Pc of picture brightness curve 530 smaller or equal to 110% of target picture bright pulse Pg.Change speech, i.e. 0.9g≤a≤1.1g and c≤1.1g.
Please refer to Figure 12, it illustrates the picture brightness curve map into the design of the third excessive driving data.Because the impression on the human vision, relevant with each picture brightness pulse to the integrated value of its image time, therefore, excessively the design of driving data OD first picture brightness pulse Pa that need make the picture brightness curve to the integrated value of image time Ta more than or equal to the target picture bright pulse to 90% of the integrated value of image time Tg, and smaller or equal to the target picture bright pulse to 110% of the integrated value of image time Tg.Change speech, promptly
Please refer to Figure 13, it illustrates the picture brightness curve map of the design that is the 4th kind of excessive driving data.Similarly, because overshoot (Overshoot) characteristic of liquid crystal molecule makes that the crest value c of second picture brightness pulse Pc will be greater than the crest value a of first picture brightness pulse Pa.Therefore, except limiting first picture brightness pulse Pa, make it
Suitable restriction will make LCD 20 have better picture performance to the integrated value of image time Tc to second picture brightness pulse Pc.So, excessively the design of driving data OD second picture brightness pulse Pc that need make picture brightness curve 530 to the integrated value of image time Tc smaller or equal to target picture bright pulse Pg to 110% of the integrated value of image time Tg.Change speech, promptly
And
Reference simultaneously is tabulation 1 and table 2 down.In addition, data volume for the excessive driving data OD that reduces above-mentioned the third and the 4th kind of design, also can select the integrated value of part first bright pulse, and according to the integrated value and of part first bright pulse with reference to ratio (shown in table 1 and table 2), whether the picture brightness of judging LCD 20 reaches the requirement of the third and the 4th kind of design, and is to make the picture brightness of LCD 20 reach the ideal ratio of aforementioned the third and the 4th kind of design with reference to ratio.In other words, be LCD 20 with reference to ratio and meet the requirements of under the picture brightness, the ideal ratio of part first bright pulse integrated value and object brightness pulse integration value.
To be the first bright pulse Pa arrive the brightness integrated value of crest value a by trough to the integrated value of part first bright pulse, and depend on start picture brightness with reference to the size of ratio, and be 0.3～0.7 with reference to ratio.Excessively the design of driving data OD need make the ratio of the integrated value of part first bright pulse and target picture bright pulse Pg equal with reference to ratio.
See also table 1:
| Change to the high gray value by low GTG value | |
0 | 64 | 128 |
| With reference to ratio | 0.35 | 0.45 | 0.55 |
See also table 2:
| Change to low GTG value by the high gray value | The high gray value | 128 | 192 | 255 |
| With reference to ratio | 0.3 | 0.6 | 0.7 |
For instance, when LCD 20 changes to GTG 255 by GTG 0, learn that by table 1 with reference to ratio be 0.35.And excessively the design of driving data OD need make the ratio of the integrated value of part first bright pulse and target picture bright pulse Pg equal 0.35.
On the contrary, when changing to GTG 0 by GTG 255, learn that by table 2 with reference to ratio be 0.7 as if LCD 20.And excessively the design of driving data OD need make the ratio of the integrated value of part first bright pulse and target picture bright pulse Pg equal 0.7.
Because different start picture brightness corresponds to different reference ratio, therefore will make LCD 20 that better dynamic image performance is arranged.
Please refer to Figure 14 and Figure 15, Figure 14 illustrates and is the arrange in pairs or groups dynamic image response curve of fixed excessive driving look-up table of scanning backlight module.Figure 15 illustrates the dynamic image response curve that excessively drives look-up table for scanning backlight module collocation scan-type.When aforesaid scan-type excessively drives look-up table LUTs collocation scanning backlight module, will find that its animate is better than fixed excessive driving look-up table LUTh collocation scanning backlight module.For instance, if when desiring to switch to 64 GTGs by 0 GTG, if the scanning backlight module is the fixed excessive driving look-up table LUTh of collocation, its dynamic image response curve (Motion PictureResponse Curve then, MPRC), will find that it produces serious smear and dual edge (double-edge) phenomenon (as shown in figure 14) in GTG switching place 910.
On the contrary, can find that from Figure 15 then dynamic image response curve MPRC is in GTG switching place 920 when if scanning backlight module collocation scan-type excessively drives look-up table LUTs, its smear and dual edge phenomenon will be improved, and make that the dynamic image performance is more clear.
Except dynamic image response curve MPRC, via tabulating 3 and dynamic image response time (the Motion Picture Response Time of table 4 down, MPRT) comparison, can find that scanning backlight module collocation scan-type excessively drives look-up table LUTs, its animate is better than the scanning backlight module fixed excessive driving look-up table LUTh that arranges in pairs or groups.In table 3 and the table 40,32,64,96,128,160,192, the different switching GTG value of 224 and 255 representatives, and on behalf of different GTGs, N-BET promptly switch down, (Blur Edge Width is BEW) divided by time of picture translational speed V gained with the blurred width among the dynamic image response curve MPRC.
See also table 3:
| N-BET(ms) | 0 | 32 | 64 | 96 | 128 | 160 | 192 | 224 | 255 |
| 0 | 111.3 | 60.4 | 39.2 | 30.2 | 19.8 | 18.2 | 14.4 | 21 | |
| 32 | 11.5 | 27.9 | 21.5 | 19.3 | 17.9 | 15 | 11.3 | 11.2 | |
| 64 | 11.4 | 19.3 | 18.5 | 17.4 | 15.1 | 12.2 | 10.8 | 11.3 | |
| 96 | 11.4 | 16.3 | 15.2 | 16.1 | 13.9 | 11.9 | 11.4 | 11.3 | |
| 128 | 11.4 | 14.4 | 14.3 | 17.2 | 13.8 | 12.3 | 10.8 | 11.3 |
| 160 | 11.3 | 12.7 | 14.4 | 16.7 | 15.8 | 10.9 | 10.9 | 11.4 | |
| 192 | 11.4 | 13.4 | 13.6 | 16.2 | 15.2 | 13.4 | 11.3 | 11.6 | |
| 224 | 11.4 | 12.8 | 13.9 | 15.3 | 15.5 | 13.3 | 11.6 | 12 | |
| 255 | 11.6 | 12.6 | 14.6 | 15.5 | 15.9 | 13.9 | 12.4 | 11.4 | |
| MPRT(ms) | 16.7 | ||||||||
See also table 4:
| N-BET(ms) | 0 | 32 | 64 | 96 | 128 | 160 | 192 | 224 | 255 |
| 0 | 15 | 24.1 | 22.9 | 22.5 | 14 | 12.5 | 11.3 | 21.9 | |
| 32 | 11.5 | 32.2 | 24.7 | 11.7 | 10.8 | 11.1 | 10.7 | 11.3 | |
| 64 | 11.4 | 10.5 | 11.2 | 11 | 11 | 10.9 | 11 | 11.4 | |
| 96 | 11.3 | 11.3 | 10.8 | 10.8 | 11.4 | 11 | 11 | 11.5 | |
| 128 | 11.3 | 11.1 | 11.2 | 11.5 | 11.6 | 11.3 | 10.7 | 11.5 | |
| 160 | 11.3 | 11.1 | 11 | 11.1 | 10.9 | 11.8 | 10.8 | 11.5 | |
| 192 | 11.3 | 11.1 | 10.9 | 11 | 11.3 | 10.9 | 11.2 | 11.8 | |
| 224 | 11.3 | 10.9 | 11 | 11.1 | 11.1 | 11.1 | 11.3 | 12.1 | |
| 255 | 11.4 | 11.2 | 10.9 | 11 | 11.3 | 11.2 | 11.2 | 11.2 | |
| MPRT(ms) | 12.4 | ||||||||
Learn that by above-mentioned table 3 and table 4 the dynamic image response time MPRT of the fixed excessive driving look-up table LUTh that arranges in pairs or groups is 16.7ms, and the dynamic image response time MPRT that the collocation scan-type excessively drives look-up table LUTs will be reduced to 12.4ms.Hence one can see that, and the collocation scan-type excessively drives the LCD 20 of look-up table LUTs when different GTGs switch, and its animate will be more clear.
Please refer to Figure 16, it is depicted as a kind of driving method of LCD.Driving method is used for above-mentioned LCD 20, and it comprises the steps: that at first shown in step 810, periodically driven light-emitting element 222, and its cycle is an image time.Then as described in the step 820, driven light-emitting element 222 reaches maximum backlight illumination w in the very first time.At last as described in the step 830, driving circuit 240 is imported overdrive voltage OV to pixel 212 according to excessive driving data OD, pixel 212 is corresponding to light-emitting component 222, overdrive voltage OV drives pixel 212 and reaches time terminating point k in second time, make pixel 212 just be converted to target picture brightness FL2, and the very first time, second time and the 3rd time are inequality by start picture brightness FL1 in the 3rd time.
The disclosed Liquid Crystal Display And Method For Driving of the above embodiment of the present invention excessively drives excessive driving data in the look-up table by suitable adjustment scan-type, will make the present invention have following advantage:
First advantage is to improve smear phenomenon and dual edge (double-edge) phenomenon.Conventional liquid crystal will persist because of human eye vision in the animation edge, and produce smear phenomenon and dual edge phenomenon.Excessively drive excessive driving data in the look-up table by suitable adjustment scan-type,, make LCD have better image performance to improve smear phenomenon and dual edge phenomenon.
Second advantage is to improve the dynamic image response time.Learn that by above-mentioned table 3 and table 4 collocation collocation scan-type excessively drives look-up table LUTs will make the dynamic image response time be improved as 12.4ms by 16.7ms.
In sum; though the present invention discloses as above with a preferred embodiment; right its is not in order to limit the present invention; any technician in the art; without departing from the spirit and scope of the present invention; when can being used for a variety of modifications and variations, so protection scope of the present invention is with being as the criterion that claims scope is defined.
Claims (20)
1. the driving method of a LCD, this LCD comprises a display panels and one scan formula module backlight, and this scanning backlight module comprises several light-emitting components, and this method comprises:
Periodically one of driven light-emitting element, and its cycle is an image time tf;
Drive this light-emitting component and make this light-emitting component reach a maximum backlight illumination in a very first time; And
Import the pixel of an overdrive voltage to this display panels, this pixel is corresponding to this light-emitting component, this overdrive voltage drives this pixel and reaches a duration of charging terminating point in one second time, makes this pixel just be converted to a target picture brightness by an initial picture brightness in one the 3rd time;
Wherein, this very first time, this second time and the 3rd time are inequality.
2. driving method as claimed in claim 1, it is characterized in that, when the driving frequency of this scanning backlight module and this pixel is identical, this second time lie in this very first time after, and the difference of this second time and this very first time equals a schedule time, and this schedule time is to equal 0%～25% of this image time in fact.
3. driving method as claimed in claim 1, it is characterized in that, when the driving frequency of this scanning backlight module during less than the driving frequency of this pixel, this second time lie in this very first time before, and the difference of this second time and this very first time equals a schedule time, and the ratio of this schedule time and this image time equals one ratio that deducts the driving frequency of this scanning backlight module and this pixel in fact.
4. driving method as claimed in claim 3 is characterized in that this schedule time equals 0%～50% of this image time in fact.
5. driving method as claimed in claim 1, it is characterized in that, the picture brightness of this pixel forms a picture brightness curve in time, this picture brightness curve forms one first picture brightness pulse and one second picture brightness pulse in regular turn, and in a stable state after the time, form a target picture bright pulse, the peak value that this overdrive voltage makes this first picture brightness pulse is more than or equal to 90% of the peak value of this target picture bright pulse, and the peak value of this first picture brightness pulse is smaller or equal to 110% of the peak value of this target picture bright pulse.
6. driving method as claimed in claim 5 is characterized in that, the peak value of this second picture brightness pulse is smaller or equal to 110% of the peak value of this target picture bright pulse.
7. driving method as claimed in claim 1, it is characterized in that, the picture brightness of this pixel forms a picture brightness curve in time, this picture brightness curve forms one first bright pulse and one second bright pulse in regular turn, and in a stable state after the time, form an object brightness pulse, the integrated value that this overdrive voltage makes this first bright pulse is more than or equal to 90% of the integrated value of this object brightness pulse, and the integrated value of this first bright pulse is smaller or equal to 110% of the integrated value of this object brightness pulse.
8. driving method as claimed in claim 7, it is characterized in that, this LCD is according to this start picture brightness decision one ratio, and this overdrive voltage makes the integrated value of this first bright pulse of part equal the integrated value of this object brightness pulse and the product of this ratio.
9. driving method as claimed in claim 8 is characterized in that, this ratio is 0.3～0.7.
10. driving method as claimed in claim 7 is characterized in that, the integrated value of this second bright pulse is smaller or equal to 110% of the integrated value of this object brightness pulse.
11. a LCD is characterized in that, comprising:
One display panels, this display panels has several pixels;
One module backlight comprises several light-emitting components;
One storage element has a fixed excessive driving look-up table and one scan formula and excessively drives look-up table; And
One drive circuit, in order to according to the kind of this module backlight optionally this fixed excessive driving look-up table of basis or this scan-type excessively drive look-up table and export an overdrive voltage to one of those pixels, make this pixel reach a duration of charging terminating point in one second time;
Wherein, when module backlight is one scan formula module backlight, this LCD periodically drive those light-emitting components one, make this light-emitting component reach a maximum backlight illumination, and its cycle is an image time in a very first time;
Wherein, when module backlight was one scan formula module backlight, this light-emitting component made this pixel just be converted to a target picture height by an initial picture brightness in one the 3rd time corresponding to this pixel;
Wherein, this very first time, this second time and the 3rd time are inequality.
12. LCD as claimed in claim 11, it is characterized in that, when the driving frequency of this scanning backlight module and this pixel is identical, this second time is after this very first time, and the difference of this second time and this very first time equals a schedule time, and this schedule time equals 0%～25% of this image time in fact.
13. LCD as claimed in claim 11, it is characterized in that, when the driving frequency of this scanning backlight module during less than the driving frequency of this pixel, this second time is before this very first time, and the difference of this second time and this very first time equals a schedule time, and the ratio of this schedule time and this image time equals one ratio that deducts the driving frequency of this scanning backlight module and this pixel in fact.
14. LCD as claimed in claim 13 is characterized in that, this schedule time equals 0%～50% of this image time in fact.
15. LCD as claimed in claim 11, it is characterized in that, the picture brightness of this pixel forms a picture brightness curve in time, this picture brightness curve forms one first picture brightness pulse and one second picture brightness pulse in regular turn, and in a stable state after the time, form a target picture bright pulse, the peak value that this overdrive voltage makes this first picture brightness pulse is more than or equal to 90% of the peak value of this target picture bright pulse, and the peak value of this first picture brightness pulse is smaller or equal to 110% of the peak value of this target picture bright pulse.
16. LCD as claimed in claim 15 is characterized in that, the peak value of this second picture brightness pulse is smaller or equal to 110% of the peak value of this target picture bright pulse.
17. LCD as claimed in claim 11, it is characterized in that, the picture brightness of this pixel forms a picture brightness curve in time, this picture brightness curve forms one first bright pulse and one second bright pulse in regular turn, and in a stable state after the time, form an object brightness pulse, the integrated value that this overdrive voltage makes this first bright pulse is more than or equal to 90% of the integrated value of this object brightness pulse, and the integrated value of this first bright pulse is smaller or equal to 110% of the integrated value of this object brightness pulse.
18. LCD as claimed in claim 17, it is characterized in that, this LCD is according to this start picture brightness decision one ratio, and this overdrive voltage makes the integrated value of this first bright pulse of part equal the integrated value of this object brightness pulse and the product of this ratio.
19. LCD as claimed in claim 18 is characterized in that, this ratio is 0.3～0.7.
20. LCD as claimed in claim 17 is characterized in that, the integrated value of this second bright pulse is less than 110% of the integrated value of this object brightness pulse.
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| CN2006101155768A CN101127197B (en) | 2006-08-14 | 2006-08-14 | Liquid crystal display device and its driving method |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103888718A (en) * | 2012-12-19 | 2014-06-25 | 辉达公司 | System and method for displaying a three-dimensional image on a video monitor |
| CN105976333A (en) * | 2016-04-29 | 2016-09-28 | 广东小天才科技有限公司 | Image blur correction method, device and intelligent equipment |
| CN111292674A (en) * | 2020-02-26 | 2020-06-16 | 福建华佳彩有限公司 | Display driving method and device with high image quality |
| CN114207700A (en) * | 2019-08-09 | 2022-03-18 | Lx半导体科技有限公司 | Source driver for controlling bias current |
Family Cites Families (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN100489948C (en) * | 2004-06-21 | 2009-05-20 | 钰瀚科技股份有限公司 | Method and device for removing image fuzzy blur between frames |
| CN100390856C (en) * | 2005-01-14 | 2008-05-28 | 友达光电股份有限公司 | LCD capable of improving dynamic frame display quality and driving method thereof |
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2006
- 2006-08-14 CN CN2006101155768A patent/CN101127197B/en active Active
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103888718A (en) * | 2012-12-19 | 2014-06-25 | 辉达公司 | System and method for displaying a three-dimensional image on a video monitor |
| CN105976333A (en) * | 2016-04-29 | 2016-09-28 | 广东小天才科技有限公司 | Image blur correction method, device and intelligent equipment |
| CN114207700A (en) * | 2019-08-09 | 2022-03-18 | Lx半导体科技有限公司 | Source driver for controlling bias current |
| CN111292674A (en) * | 2020-02-26 | 2020-06-16 | 福建华佳彩有限公司 | Display driving method and device with high image quality |
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| Publication number | Publication date |
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| CN101127197B (en) | 2010-12-08 |
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