CN100390856C - LCD capable of improving dynamic frame display quality and driving method thereof - Google Patents
LCD capable of improving dynamic frame display quality and driving method thereof Download PDFInfo
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- CN100390856C CN100390856C CNB2005100046152A CN200510004615A CN100390856C CN 100390856 C CN100390856 C CN 100390856C CN B2005100046152 A CNB2005100046152 A CN B2005100046152A CN 200510004615 A CN200510004615 A CN 200510004615A CN 100390856 C CN100390856 C CN 100390856C
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Abstract
The present invention relates to a liquid crystal display for improving the display quality of dynamic frames and a driving method thereof. The liquid crystal display comprises a pixel, a data driving circuit and a scanning driving circuit, wherein the data driving circuit generates overdriving pixel data according to the pixel data of No. N frame and gray pixel data according to pixel data of No. N+1 frame and respectively outputs the corresponding overdriving pixel data and driving voltage of black pixel data and gray pixel data to the pixel in a first, a second and a third time points; the scanning driving circuit respectively outputs scanning signals in the first, the second and the third time points so that the pixel receives the overdriving pixel data and the driving voltage of the black pixel data and the gray pixel data; the corresponding overdriving pixel data and the driving voltage of the black pixel data and the gray pixel data are a brightness curve similar to a pulse curve to generate the pixel.
Description
Technical field
The present invention relates to a kind of Liquid Crystal Display And Method For Driving, and particularly relate to a kind of Liquid Crystal Display And Method For Driving that can improve the display quality of dynamic frame.
Background technology
The display mode of conventional cathode ray tube display is to be pulsed (impulse type), and its each pixel is in each frame time, and the shinny time has only in a flash.Please refer to Fig. 1, it is the brightness and the time relation figure of a pixel in the cathode-ray tube display.Pixel data D1, D2, D3 produce corresponding brightness I1, I2, I3 at frame time T1, T2, T3 respectively.By being very fast for pulsed and its reaction velocity at cathode-ray tube display, therefore shown frame is not influenced by the brightness of previous frame can now, so dynamic frame does not have residual image.
The display mode of conventional liquid crystal then for keeping formula (hold type), keep certain ideally by the brightness of its pixel in a frame time.Please refer to Fig. 2, it is the brightness and the time relation figure of a pixel in the conventional liquid crystal.This pixel in frame time T1 ', T2 ', T3 ', produces different brightness curve L1, L2, L3 according to different driving voltage V1, V2, V3 respectively.As can be seen from Figure 2, because the speed that the liquid crystal molecule reaction velocity changes less than electric field, therefore need one period reaction time just can reach the brightness of target, promptly brightness curve L2 as shown in Figure 2 can obviously find out, in time T 2 ', brightness L2 almost when frame time T2 finishes soon, just rises to the pairing brightness of driving voltage V2.
Because the liquid crystal molecule reaction velocity is fast inadequately, so LCD when showing dynamic frame, just has residual image easily, and influences display quality.For example the oblique line among Fig. 2 partly, when frame time T3 has just begun, because that the shown image of frame time T2 still has is residual, the image relay that this ghost will be shown with frame time T3 ' so will influence the dynamic frame display quality of LCD.
Summary of the invention
In view of this, purpose of the present invention is exactly that a kind of Liquid Crystal Display And Method For Driving that can improve the display quality of dynamic frame is being provided, and it can make pixel produce the brightness curve of similar pulsed, to improve the display quality of dynamic frame effectively.
According to purpose of the present invention, a kind of LCD that can improve the display quality of dynamic frame is proposed, it comprises pixel, scan drive circuit and data drive circuit.Pixel is to electrically connect and produce in a frame time predetermined luminance with sweep trace and data line.Data drive circuit produces the pixel data generation gray pixels data of overdrive pixel data and foundation N+1 frame according to the pixel data of N frame, and exports the driving voltage of corresponding overdrive pixel data, black picture element data and gray pixels data to pixel at very first time point, second time point and the 3rd time point via data line respectively.Scan drive circuit be respectively at very first time point, second time point and the 3rd time point via sweep trace output scanning signal so that pixel energy receives the driving voltage of overdrive pixel data, black picture element data and gray pixels data.Wherein, the driving voltage of corresponding overdrive pixel data, black picture element data and gray pixels data is to make pixel produce this predetermined luminance.
According to another object of the present invention, a kind of driving method of LCD of the display quality that can improve dynamic frame is proposed, it is in order to drive the picture element matrix of LCD, to make picture element matrix show the pixel data of N frame in a frame time.This picture element matrix comprises a pixel at least.This driving method is as follows.In first time frame time, produce corresponding to the overdrive pixel data of the pixel data of N frame and the driving voltage of exporting corresponding overdrive pixel data to pixel.Then, in second time frame time, the driving voltage of importing corresponding black picture element data is to pixel.At last, in frame time for the third time, produce corresponding to the gray pixels data of the pixel data of N+1 frame and the driving voltage of exporting corresponding gray pixels data to pixel.Wherein, frame time is divided into for the first time frame time, frame time and frame time for the third time for the second time successively.The driving voltage of corresponding overdrive pixel data, black picture element data and gray pixels data is to make pixel produce this predetermined luminance.
For above-mentioned purpose of the present invention, feature and advantage can be become apparent, a preferred embodiment cited below particularly, and conjunction with figs. are described in detail below.
Description of drawings
Fig. 1 is the brightness and the time relation figure of a pixel in the cathode-ray tube display.
Fig. 2 is the brightness and the time relation figure of a pixel in the conventional liquid crystal.
Fig. 3 is the synoptic diagram according to the LCD of a preferred embodiment of the present invention.
Fig. 4 is the driving voltage of pixel 308 and the graph of relation of luminosity.
Fig. 5 A-5C is the time cycle that each sweep trace of present embodiment is enabled, the synoptic diagram of the data that received with each pixel.
Fig. 6 is the oscillogram that corresponds to the sweep signal SL ' of Fig. 5 A-5C.
The reference numeral explanation
300: LCD
302: data drive circuit
304: scan drive circuit
306: picture element matrix
308: pixel
Embodiment
Please refer to Fig. 3, it is the synoptic diagram according to a kind of LCD of a preferred embodiment of the present invention.LCD 300 comprises data drive circuit 302, scan drive circuit 304 and picture element matrix 306.Data drive circuit 302 drives picture element matrix 306 via data line (data lines) DL and sweep trace (scan lines) SL respectively with scan drive circuit 304.Picture element matrix 306 comprises a pixel at least, and for example pixel 308.Pixel 308 is to electrically connect with sweep trace SL (1) and data line DL (1).Pixel 308 produces a predetermined luminance in a frame time (frame time).Data drive circuit 302 is that the pixel data I according to the N frame produces overdrive pixel data D and produces gray pixels data G according to the pixel data I ' of N+1 frame, and respectively very first time point t1, the second time point t2 and the 3rd time point t3 via the driving voltage of data line DL (1) output corresponding overdrive pixel data D, black picture element data B and gray pixels data G to pixel 308 (please cooperate) with reference to the t1 among the figure 4, t2 and t3.
Furthermore, please refer to Fig. 4, it is the driving voltage of pixel 308 and the graph of relation of luminosity.Pixel 308 shows the predetermined luminance of the pixel data I that corresponds to the N frame in a frame time.In the driving method of present embodiment, the frame time T of each frame is split into frame time T1 for the first time ", frame time T2 for the second time " with frame time T3 for the third time ", and frame time T1 ", T2 ", T3 " time span than deciding on the display effect of desiring to reach.Preferably, when its ratio was 2: 1: 1, the dynamic image quality of generation was better.
At the frame time T1 first time " in, pixel data I produces corresponding overdrive pixel data D after suitably calculating, and for example overdrive pixel data D is to obtain via pixel data I contrast comparison list (look uptable).Data drive circuit 302 will correspond to the voltage V1 ' of overdrive pixel data D, and some t1 exports pixel 308 in the very first time, so that pixel 308 produces the first brightness L1 '.Very first time point t1 is frame time T1 for the first time " start time point.
At the frame time T2 second time " in, data drive circuit 302 in second time point t2 output corresponding to the voltage V2 ' of black picture element data B to pixel 308 so that pixel 308 produces the second brightness L2 ', voltage V2 ' corresponds to the darkest GTG value of brightness.The second time point t2 is frame time T2 for the second time " start time point.
At frame time T3 for the third time " in; data drive circuit 302 in the 3rd time point t3 output corresponding to the voltage V3 ' of gray pixels data G to pixel 308; so that the liquid crystal molecule of pixel 308 produces a pre-dumping angle (pre-tilt angle) and produces the 3rd brightness L3 '; this pre-dumping angle can be accelerated pixel data I ' the pairing orientation of the liquid crystal molecule reaction of pixel 308 to the N+1 frame; so gray pixels data G is that pixel data I ' according to the N+1 frame is to produce; so that the liquid crystal molecule reaction velocity is faster, the time that shows with the accelerogram picture.And similarly, the 3rd time point t3 is frame time T3 for the third time " zero-time.
Promptly correspond to the predetermined luminance of pixel data I by the equivalent luminance of brightness L1 ', L2 ' and L3 ', predetermined luminance is the dotted line L4 among Fig. 4 for example.The spirit of present embodiment is, by making the formed brightness curve of L1 ', L2 ' and L3 ' be similar to pulse curve, to improve the display quality of dynamic frame effectively.That is to say, the curve that brightness L1 ', L2 ' and L3 ' are linked to be can be found out, because frame time T1 for the first time " in driving voltage V1 ' bigger than existing; so brightness L1 ' reaction time of rising is faster than existing driving method; then at the frame time T2 second time " in driving voltage V2 ', its corresponding black is drawn fast data B, therefore the brightness L2 ' of pixel 308 just promptly descends fast, to form similar pulse curve, so can reduce tradition and keep the residual phenomenon of human eye vision that the formula display mode causes, to promote dynamic display quality.At last at frame time T3 for the third time " in, by the driving voltage V3 ' that corresponds to gray pixels data G, make liquid crystal produce the pre-dumping angle.This pre-dumping angle can be accelerated the time of the liquid crystal molecule reaction of pixel 308 to next brightness, for example as can be seen from the frame time T ' of N+1 frame, when pixel 308 desires show brighter brightness, by the driving voltage V3 ' of the frame time T of N frame make pixel 308 when the N+1 frame more near driving voltage V1 " the brightness L1 that desires to reach ".Wherein the big young pathbreaker of driving voltage V3 ' look the characteristic of liquid crystal molecule and next frame (N+1 frame) pixel data I ' size and determine so that liquid crystal molecule produces best pre-dumping angle.
For convenience of explanation, be 800*600 now with the exploration on display resolution ratio, the picture element matrix 306 that just has 600 row, 800 row is the row explanation.Inferior frame time T1 ", T2 ", T3 " the time span ratio be 1: 1: 1; 1/3rd times that promptly respectively account for a frame time T are example, and the relation of the pixel data that the time cycle that the sweep trace of present embodiment is enabled and each pixel are received is done further explanation.Please be simultaneously with reference to Fig. 5 A-5C and Fig. 6, Fig. 5 A-5C is the time cycle that each sweep trace of present embodiment is enabled, the synoptic diagram of the picture speed data that received with each pixel, and Fig. 6 is the oscillogram that corresponds to the sweep signal SL ' of Fig. 5 A-5C.R1-R600 represents 600 row pixels of LCD 300 respectively, and C1-C800 represents 800 row pixels of LCD 300 respectively.Suppose that LCD 300 in 1800 cycle P (1)-P (1800), finishes the scanning of a frame.
From Fig. 5 A and Fig. 6 as can be known, when wanting display frame N, scan drive circuit 304 at first in time cycle P (1), makes the sweep signal SL ' (1) that inputs to sweep trace SL (1) for enabling, to open the first row pixel R1.Simultaneously, data drive circuit 302 is in time cycle P (1), output is corresponding to the overdrive pixel data D (1 of the 1-8 00 row pixel of the first row pixel R1 of N frame, 1-800, driving voltage to the first row pixel R1 N) is so that the first row pixel R1 shows the pairing brightness of overdrive pixel data D of N frame at period 1 P (1), in Fig. 5 A, be denoted as P (1), D (1,1-800, N).Then, scan drive circuit 304 enables the 201st row pixel R201 so that the pixel on the R201 P second round (2) receive the N-1 frame gray pixels data G (201,1-800, N-1) pairing driving voltage.Follow again, scan drive circuit 304 enables the 401st row pixel R401, so that the pixel on the R401 receives the driving voltage (just corresponding to the darkest driving voltage of brightness) of black picture element data B correspondence in period 3 P (3), the black picture element data B (401 of N-1 frame for example, 1-800, N-1) pairing driving voltage.Wherein, the thin film transistor (TFT) of each pixel is only to be unlocked once in a frame time in the conventional ADS driving method, so the cycle P (1) among Fig. 6, P (2) are cycle that sweep signal enables of tradition with P (3).
Order according to this makes pixel on the R2-R200 respectively in cycle P (4), P (7)-P (598), receive the N frame overdrive pixel data D (2,1-800, N), D (3,1-800, N)-D (200,1-800, N) pairing voltage; Make pixel on the R202-R400 respectively in cycle P (5), P (8)-P (599), receive the N-1 frame gray pixels data G (202,1-800, N-1), G (203,1-800, N-1)-G (400,1-800, N-1) pairing driving voltage; And make pixel on the R401-R600 respectively in cycle P (6), P (9)-P (600), receive the N-1 frame black picture element data B (402,1-800, N-1), B (403,1-800, N-1)-B (600,1-800, N-1) pairing voltage.
Similarly, make pixel on the R1-R200 respectively when cycle P (601), P (604)-P (1198), receive the N frame black picture element data B (1,1-800, N), B (2,1-800, N)-B (200,1-800, N) pairing driving voltage; Make pixel on the R201-R400 respectively in cycle P (602), P (605)-P (1199), receive the N frame extremely drive data pixel data D (201,1-800, N), D (202,1-800, N)-D (400,1-800, N) pairing driving voltage; And make pixel on the R401-R600 respectively in cycle P (603), P (606)-P (1200), receive the N-1 frame gray pixels data G (401,1-800, N-1), B (402,1-800, N-1)-B (600,1-800, N-1) pairing driving voltage.
Then, make pixel on the R1-R200 respectively when cycle P (1201), P (1204)-P (1798), receive the N frame gray pixels data G (1,1-800, N), G (2,1-800, N)-G (200,1-800, N) pairing driving voltage; Make pixel on the R201-R400 respectively in cycle P (1202), P (1205)-P (1799), receive the N frame black picture element data B (201,1-800, N), B (202,1-800, N-B (400,1-800, N) pairing voltage; And make pixel on the R401-R600 respectively in cycle P (1203), P (1206)-P (1800), receive the N frame overdrive pixel data D (401,1-800, N), D (402,1-800, N)-D (600,1-800, N) pairing driving voltage.At cycle P (1800) afterwards, the pairing voltage of extremely drive data pixel data D of N frame is all to have imported to finish, after repeating above-mentioned steps, also black picture element data B and the pairing driving voltage of gray pixels data G of entire frame N can have been imported, and reach the inferior frame time T1 of present embodiment ", T2 ", T3 " the time span ratio be 1: 1: 1 purpose.
By above-mentioned scan method, just can reach the similar pulse curve of brightness curve that makes each pixel generation in the picture element matrix.So also can use other scan method, as long as pixel is opened 3 times, to receive the effect that 3 different driving voltages (driving voltages of corresponding overdrive pixel data, black picture element data and gray pixels data) can produce present embodiment.
The disclosed Liquid Crystal Display And Method For Driving of the foregoing description, by a frame time being divided into three partly, and produce three groups of different driving voltages, so that the similar pulse curve of brightness that pixel produces, so can reduce tradition and keep the residual phenomenon of human eye vision that the formula display mode causes, to promote dynamic display quality.
In sum; though the present invention discloses as above with a preferred embodiment; right its is not in order to limit the present invention; anyly have the knack of this skill person; 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 as the criterion when looking accompanying the claim person of defining.
Claims (9)
1. LCD comprises:
Pixel is to electrically connect with corresponding sweep trace and data line, and this pixel produces a predetermined luminance in a frame time;
One data drive circuit, be that pixel data according to a N frame produces an overdrive pixel data and produces gray pixels data according to the pixel data of a N+1 frame, and respectively very first time point, one second time point and one the 3rd time point via this data line output to should overdrive pixel data, the driving voltage of black picture element data and these gray pixels data is to this pixel; And
Scan driving circuit is to export one scan signal so that this pixel energy receives the driving voltage of this overdrive pixel data, these black picture element data and these gray pixels data at this very first time point, this second time point and the 3rd time point via this sweep trace respectively;
Wherein, the driving voltage that corresponds to this extremely drive data pixel data, these black picture element data and these gray pixels data is to make this pixel produce one first brightness, one second brightness and one the 3rd brightness respectively, and the equivalent luminance of this first brightness, this second brightness and the 3rd brightness is essentially this predetermined luminance.
2. LCD as claimed in claim 1, wherein, the pairing voltage of these gray pixels data is to make the liquid crystal molecule of this pixel produce a pre-dumping angle, and this pre-dumping angle can be accelerated the liquid crystal molecule reaction of this pixel to the pairing orientation of the pixel data of this N+1 frame.
3. LCD as claimed in claim 1, wherein, this pixel maintains this first brightness, this second brightness is essentially 2: 1: 1 with the time section length ratio of the 3rd brightness.
4. LCD as claimed in claim 1, wherein, this pixel maintains this first brightness, this second brightness is essentially 1: 1: 1 with the time section length ratio of the 3rd brightness.
5. the driving method of a LCD is in order to driving a picture element matrix of this LCD, to make this picture element matrix show the pixel data of a N frame in a frame time, and this picture element matrix comprises a pixel at least, and this driving method comprises:
One for the first time in the frame time, produce corresponding to an overdrive pixel data of the pixel data of this N frame and output driving voltage that should overdrive pixel data to this pixel;
One for the second time in the frame time, the driving voltage of importing corresponding black picture element data is to this pixel; And
One for the third time in the frame time, produce corresponding to the gray pixels data of the pixel data of a N+1 frame and output driving voltage that should the gray pixels data to this pixel;
Wherein, to should overdrive pixel data, the driving voltage of these black picture element data and these gray pixels data is to make this pixel produce a predetermined luminance;
Wherein, this frame time is divided into frame time, a frame time and a frame time for the third time for the second time for the first time successively.
6. driving method as claimed in claim 5, wherein, this frame time, this first time second time frame time and this for the third time the time span ratio of frame time be essentially 2: 1: 1.
7. driving method as claimed in claim 5, wherein, this frame time, this first time second time frame time and this for the third time the time span ratio of frame time be essentially 1: 1: 1.
8. driving method as claimed in claim 5, wherein, this overdrive pixel data is to obtain via comparison list.
9. driving method as claimed in claim 5, wherein, the pairing driving voltage of these gray pixels data is to make the liquid crystal molecule of this pixel produce a pre-dumping angle, and this pre-dumping angle can be accelerated the liquid crystal molecule reaction of this pixel to the pairing orientation of the pixel data of this N+1 frame.
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN100359557C (en) * | 2005-08-04 | 2008-01-02 | 友达光电股份有限公司 | Liquid crystal driving system and method |
| US8749465B2 (en) | 2005-11-30 | 2014-06-10 | Au Optronics Corporation | Method and system for driving an active matrix display device |
| CN100380189C (en) * | 2006-03-10 | 2008-04-09 | 友达光电股份有限公司 | Method for displaying liquid crystal display panel dynamic image |
| CN101127197B (en) * | 2006-08-14 | 2010-12-08 | 奇美电子股份有限公司 | Liquid crystal display device and its driving method |
| KR101222988B1 (en) * | 2007-05-29 | 2013-01-17 | 엘지디스플레이 주식회사 | Liquid Crystal Display and Driving Method thereof |
| CN101127201B (en) * | 2007-09-29 | 2010-06-09 | 昆山龙腾光电有限公司 | Liquid crystal display panel quick over-driving method |
| US10643528B2 (en) * | 2018-01-23 | 2020-05-05 | Valve Corporation | Rolling burst illumination for a display |
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| US5920300A (en) * | 1994-10-27 | 1999-07-06 | Semiconductor Energy Laboratory Co., Ltd. | Active matrix liquid crystal display device |
| CN1519620A (en) * | 2003-02-07 | 2004-08-11 | 三洋电机株式会社 | Displaying method, displaying device, and data write circuit for such displaying device |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5920300A (en) * | 1994-10-27 | 1999-07-06 | Semiconductor Energy Laboratory Co., Ltd. | Active matrix liquid crystal display device |
| CN1519620A (en) * | 2003-02-07 | 2004-08-11 | 三洋电机株式会社 | Displaying method, displaying device, and data write circuit for such displaying device |
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