CN100578304C - Driving method of liquid crystal display and device thereof - Google Patents
Driving method of liquid crystal display and device thereof Download PDFInfo
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- CN100578304C CN100578304C CN200610136198A CN200610136198A CN100578304C CN 100578304 C CN100578304 C CN 100578304C CN 200610136198 A CN200610136198 A CN 200610136198A CN 200610136198 A CN200610136198 A CN 200610136198A CN 100578304 C CN100578304 C CN 100578304C
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Abstract
The invention discloses a driving method based on liquid crystal response characteristic and a device thereof, wherein, within a picture frame display time, a first scan and a second scan are carried out. When the first scan is carried out, within a first display time, an overvoltage drives liquid crystal molecules to change the state for achieving an angle needed by a target gray level. When the second scan is carried out, within a second display time, a voltage corresponding to a black picture data is inputted, the first display time and the second display time are less than the picture frame display time respectively; moreover, the first display time and the second display time can be changed, so that the totalling of the first display time and the second display time is equal to the picture frame display time.
Description
[technical field]
The present invention is the driving method and the device thereof of the driving method and the device thereof, particularly a kind of LCD of relevant a kind of display.
[background technology]
(Liquid Crystal Display, (Cathode Ray Tube, CRT) display becomes the main flow of display now to LCD LCD) to replace cathode-ray tube (CRT).With display mode, the display mode of traditional CRT screen is impulse type (impulse type) pattern, and as shown in Figure 1, L1 represents the light operation curve, the nucleophobic impact of pixel and deepening again after producing required brightness.On the other hand, the display mode of LCD is for continuing type (holdtype) pattern, as shown in Figure 2, after liquid crystal pixel electrodes charges to required potential difference (PD) (voltage data signal shown in D1), liquid crystal molecule promptly rotates to corresponding angle lentamente, the light of backlight can be passed through, to produce corresponding GTG (gray level) brightness (the light operation curve shown in L2).That is to say, Thin Film Transistor-LCD is in normal display mode, when applying voltage, gate make the thin film transistor (TFT) of connection become conducting, pixel electrode then can be charged to required voltage, this moment, liquid crystal can go to the corresponding tilt angle of institute's charging voltage, the degree difference that the light of backlight is passed through is to reach required color.The transition time of liquid crystal (or claiming the response time), (arbitrary GTG is to arbitrary GTG) all is the time (for example 16ms) greater than a picture frame in many cases.
The difference of above-mentioned two kinds of display modes and structure makes LCD fuzzyyer and easily find for human eye than traditional C RT screen when showing dynamic menu.For the shortcoming that the lasting pattern formula of improving LCD shows, it is to utilize superpotential to drive the response time that (Over Driving) reduces liquid crystal that a kind of mode is arranged, and improves fuzzy and smear phenomenon.Another kind of mode then is that (Black Insertion Technology, BJT), it comprises data black plug and two fields of black plug backlight to black insertion technology.At the data black insertion technology; system with the normal pictures data of LCD and black picture data Alternation Display in a picture frame or distribute and be shown in the picture frame; patent as Japanese patent application publication No. JP2003-295835 discloses, the mode of its black plug be with normal pictures data and black picture data Alternation Display in a picture frame.In addition; Japanese patent application publication No. JP system that 2003-108104 discloses is shown in normal pictures data and the distribution of black picture data in one picture frame; its allocation scheme is for once showing two lines (opening two gate pulse), and one is normal data, and one is black picture data.The disclosed method of Japanese patent application publication No. JP 2000-122596 is that normal pictures data and the distribution of black picture data are shown in the picture frame; its allocation scheme is for once showing four or many lines (opening many gate pulse); article one, be normal data; article one, be black picture data; article one, be normal data, other is black picture data.
The above knows that each patent proposes different mode and methods and reaches black insertion technology, utilize to insert the black picture and isolate bluring or the smear phenomenon that human eye institute can perceive, but its technology is sacrificed the whole picture brightness and the transition time of liquid crystal, secondly, known black insertion technology does not have the response time properties of considering liquid crystal fully.Figure 3 shows that known liquid crystal response time waveform characteristic with black insertion technology, in a picture frame time T f, show time T 1 in first, if liquid crystal is not when transition is to suitable GTG as yet (shown in the H point), just show and insert black picture data in the time T 2 second, so shown picture does not all reach required GTG, that is whole picture can with original desire picture displayed difference to some extent.That is to say, the LCD that to use black insertion technology when us and LCD originally do one relatively the time, though can find blooming improves, sharper keen during display text, but integral brightness descends and its color is variant, red in original red, green unlike original green, its reason is the black insertion technology of the liquid crystal transition time not being taken into account.
[summary of the invention]
In order to address the above problem, one of the object of the invention, system provides a kind of driving method of LCD, be used in the picture frame demonstration time and carry out twice scanning, take into account the liquid crystal transition to target gray scale with from any GTG transition to the required time of grey black rank, better quality is arranged when making the liquid crystal display displays dynamic menu.
One of the object of the invention is the drive unit that a kind of LCD is provided, utilize Application Specific Integrated Circuit (ASIC), read the drawing frame data that the is stored in storer processing that compares, and by the data of tabling look-up to obtain the superpotential drive characteristic curve, control picture scan mode and output grey black rank picture data, realize the driving method of black insertion technology, can realize effectively that black insertion technology is to save the hardware manufacturing cost.
In order to achieve the above object, one embodiment of the invention provides a kind of liquid crystal display driving method, in the picture frame demonstration time, carry out one first scanning, and drive liquid crystal molecule transition in one first demonstration time with a superpotential and reach one of the required angle of a target gray scale; And in the picture frame demonstration time, carry out one second scanning, and in one second demonstration time the corresponding voltage of input one black picture data, wherein the first demonstration time and the second demonstration time show the time less than picture frame respectively, and the first demonstration time of modulation (modulate) equals the picture frame demonstration time with the second demonstration time to obtain the first demonstration time that added up and the second demonstration time.
In addition, one embodiment of the invention provides a kind of drive unit of LCD, comprises the pixel data of a memory storage one picture frame; One ROM (read-only memory) stores the data of tabling look-up, and these data of tabling look-up comprise one of LCD superpotential drive characteristic function; And an Application Specific Integrated Circuit electrically connects this storer and ROM (read-only memory), wherein one of pixel data twice scanning in the picture frame demonstration time of Application Specific Integrated Circuit control demonstration picture frame.
[description of drawings]
Figure 1 shows that known CRT screen impulse type display mode synoptic diagram.
Figure 2 shows that known LCD continues type display mode synoptic diagram.
Figure 3 shows that known liquid crystal response time response synoptic diagram with black insertion technology.
One of Figure 4 shows that according to the present invention the liquid crystal response time waveform synoptic diagram of embodiment with black insertion technology.
Figure 5 shows that the black insertion technology picture shows synoptic diagram according to an embodiment of the invention.
Figure 6 shows that liquid crystal response time waveform synoptic diagram according to another embodiment of the present invention with black insertion technology.
Figure 7 shows that a kind of scan mode demonstration synoptic diagram according to the black insertion technology of Fig. 6.
Figure 8 shows that another kind of scan mode demonstration synoptic diagram according to the black insertion technology of Fig. 6.
Figure 9 shows that liquid crystal response time waveform synoptic diagram according to still another embodiment of the invention with black insertion technology.
Figure 10 shows that a kind of scan mode demonstration synoptic diagram according to the black insertion technology of Fig. 9.
Figure 11 shows that another kind of scan mode demonstration synoptic diagram according to the black insertion technology of Fig. 9.
Figure 12 shows that the function block schematic diagram of LCD pulse mode drive unit according to an embodiment of the invention.
[embodiment]
One of Figure 4 shows that according to the present invention embodiment, the drive pattern synoptic diagram of the single pixel of its LCD.As shown in the figure, L42 is the liquid crystal response time response curve of former panel, and the superpotential that L41 then selects for desire drives the response time properties curve of liquid crystal.In present embodiment, show in the time T f (from T0 to Tn) for a picture frame, twice of same picture element scan.Consider the response time properties of liquid crystal when scanning for the first time, select a suitable superpotential drive characteristic curve, make that transition was to required target gray scale when liquid crystal drove (T0) to time point T* (the first demonstration time was T1) for the first time from quilt, promptly L43 arrives the pairing voltage A of target gray scale when time point T*.Secondly, begin to carry out the corresponding voltage of scanning for the second time and the black picture data of input, make when liquid crystal is begun to show end time (Tn, second shows time T 2) to picture frame from driving for the second time from any GTG transition to the grey black rank from time point T*.According to above-mentioned, first shows that time T 1 and second shows that the sum total of time T 2 equals picture frame and shows time T f, and promptly above-mentioned scanning motion shows among the time T f in single picture frame to be finished, and does not influence single picture frame and shows time T f.Moreover, according to spirit of the present invention, can adjust the liquid crystal required time of transition according to the characteristic of liquid crystal molecule, promptly on time shaft, time point T* can be positioned at arbitrary position that a picture frame shows time T f, and when time point T*, liquid crystal transition is to required target gray scale angle.Therefore, when the liquid crystal molecule transition is longer to the time of required target gray scale, can adjust the position of time point T*, when guaranteeing to go through the first demonstration time T 1, liquid crystal molecule transition is to required target gray scale angle.On the other hand, when liquid crystal molecule is longer from any GTG transition to the required time of grey black rank, can adjust the position of time point T*, when guaranteeing to go through the second demonstration time T 2, liquid crystal molecule transition is to the required angle in grey black rank.
According to spirit of the present invention, will illustrate that below a picture frame scans twice o'clock variation on liquid crystal panel with the situation that a picture shows in the time in a picture frame.With reference to Fig. 5, carry out scanning the first time and importing present picture data during starting point in the picture frame time, picture 51 is shown in picture frame time T f initial (T0 among Fig. 4) or shows present picture data (C) during near initial time point.When putting T* time of arrival, carry out the black picture data of second time scanning and input, picture 52 be shown in time point T* or back the time show that black picture data (B), picture 53 represent that then present picture frame shows end, the demonstration of preparing next picture frame.Above-mentioned scan mode equals to show the situation of the time of black picture data applicable to time of display picture data, i.e. liquid crystal transition is to the time of the required angle of target gray scale and approximate situation of time from any GTG transition to the required angle in grey black rank.
A kind of situation in Fig. 6 key diagram 4, promptly when liquid crystal is longer from any GTG transition to the required time of grey black rank, then first shows that time T 1 shows time T 2 less than second, just need elongate second and show time T 2, must select higher overdrive voltage when scan this moment for the first time, make liquid crystal transition before long time transition be arranged to the grey black rank behind the black picture data of scanning input so for the second time to the required angle of target gray scale less than the time point T* of 8ms.
Show that with regard to first time T 1 shows with regard to the scan mode of time T 2 (being that T* is near T0) less than second, Figure 7 shows that the scan mode of two drive IC of configuration, a picture frame is divided into two blocks 701 is controlled by different drive IC (figure does not paint) respectively with 702.Carry out the scanning first time during starting point and when block 701 begins to scan in the picture frame time, it is initial or show the present picture data (C) of block 701,702 data (P) that show last picture frames of block when the initial time point (T0) that picture 71 is shown in picture frame time T f.When putting T* time of arrival, carry out the scanning second time of block 701 and the black picture data of input block 701, begin to carry out the scanning second time of block 702 and the present picture data of input block 702 this moment, when picture 72 is shown in time point T*, block 701 shows black picture data (B), and block 702 is kept the data (P) that show last picture frame and prepared to show present picture data.After, picture 73 expression blocks 702 show present picture datas (C), 701 of blocks are kept and are shown black picture data.When having arrived near picture frame time T f terminal point (Tn among Fig. 4), block 702 has carried out the scanning second time, and picture 74 expression blocks 701 all show black picture data with block 702.According to above-mentioned, two drive IC carry out scanning for twice on the block of control separately respectively at different time points, make the liquid crystal of each block correspondence have time enough from any GTG transition to the grey black rank.Shown in Figure 8 then is the scan mode of three drive IC of configuration, a picture frame is divided into three blocks 801,802 is controlled by different drive IC (figure does not paint) respectively with 803, and scan mode is similar to Fig. 7, repeats no more in this.
Another kind of situation in Fig. 9 key diagram 4, promptly when liquid crystal from any GTG transition time required to the grey black rank more in short-term, then first shows that time T 1 shows time T 2 greater than second, just can shorten second and show time T 2, must select lower overdrive voltage when scan for the first time this moment, make liquid crystal behind the time point T* of 8ms transition to the required angle of target gray scale.
Show that with regard to first time T 1 shows with regard to the scan mode of time T 2 (being that T* is near Tn) greater than second, Figure 10 shows that the scan mode of three drive IC of configuration, a picture frame is divided into three blocks 901,902 is controlled by different drive IC (figure does not paint) respectively with 903.Carry out the scanning first time during starting point and when block 901 begins to scan in the picture frame time, picture 91 is shown in picture frame time T f starting point (T0) or shows the present picture data (C) of block 901 during near initial time point, block 902 shows black picture data, 903 data (P) that show last picture frame of block.When the first time, scanning proceeded to block 902, block 902 showed its present picture datas (C) in the picture 92, and block 901 is kept its present picture data (C), and 903 of blocks show black picture data (B).Through scanning the back near picture frame end time (Tn) second time of carrying out block 901, block 901 shows black picture data (B) in the picture 93, block 902 and the 903 present picture datas (C) that show separately.According to above-mentioned, three drive IC carry out scanning for twice on the block of control separately respectively at different time points, make that the liquid crystal of each block correspondence can be according to less overdrive voltage transition to the required angle of target gray scale.Shown in Figure 11 then is the scan mode of four drive IC of configuration, a picture frame is divided into four blocks 904,905,906 is controlled by four different drive IC (figure does not paint) respectively with 807, and scan mode is similar to FIG. 10, repeats no more in this.
Figure 12 shows that the function block schematic diagram of the drive unit of LCD according to an embodiment of the invention.In an embodiment, pulse mode drive unit 130 comprises: a storer 131 stores the pixel data of a picture frame; One ROM (read-only memory) 133 store one table look-up data (Look up Table, LUT), the data of tabling look-up are the characteristic function of LCD; And one Application Specific Integrated Circuit 132 (ASIC) electrically connect storer 131 and ROM (read-only memory) 133.Application Specific Integrated Circuit 132 produces a time control signal (timing control signal), arteries and veins (dot clock) signal more for example, use to be controlled in a picture frame demonstration time T f display panels 140 is carried out twice scanning, liquid crystal to LCD when scanning for the first time imposes the response time that superpotential drives the quickening liquid crystal, make liquid crystal show that in first transition to picture frame shows the GTG (target gray scale) of the required angle that reaches to produce corresponding demonstration in the time T f in the time T 1, when picture frame time point T*, start scanning for the second time, show the corresponding voltage of importing a black picture data in the time T 2 in second; Wherein but the first demonstration time T 1 and the second demonstration time T 2 are modulations, but promptly picture frame time point T* is a modulation, and T1+T2=Tf.
Secondly, in the present embodiment, storer 131 is that (SynchronousDRAM SDRAM) or double-speed Synchronous Dynamic Random Access Memory (Double-Data-Rate SDRAM), can store the pixel data of a whole picture frame to a synchronous dynamic RAM.ROM (read-only memory) 133 is that an electric current can be eliminated programmable read only memory (Electrically Erasable﹠amp; Programmable ROM EEPROM), can deposit the data of using in the superpotential drive pattern of tabling look-up.Application Specific Integrated Circuit 132 utilize handle with the data comparison of picture frame and by the data of tabling look-up obtaining the superpotential drive characteristic curve, and control picture scan mode and output grey black rank picture data and associated drives control signal realization pulse mode driving method.
Comprehensively above-mentioned, the present invention utilizes superpotential to drive and cooperates black insertion technology, not only consider the effect that can reach target gray scale, the response time properties of also considering liquid crystal has better quality with GTG transition arbitrarily to the required time of grey black rank when making TFT-LCD show dynamic menu.Again, calculate the superpotential drive characteristic curve of liquid crystal panel, and control the picture scan mode and realize the pulse mode driving method, can realize effectively that black insertion technology is to save the hardware manufacturing cost with output grey black rank picture data with Application Specific Integrated Circuit.
Above-described embodiment only is explanation technological thought of the present invention and characteristics, its purpose makes the personage who has the knack of this skill can understand content of the present invention and is implementing according to this, when can not with qualification claim of the present invention, promptly the equalization of doing according to disclosed spirit generally changes or modifies, and must be encompassed in the claim of the present invention.
Claims (10)
1. a liquid crystal display driving method comprises;
In the picture frame demonstration time, carry out one first scanning, and drive liquid crystal molecule transition in one first demonstration time with a superpotential and reach the required angle of a target gray scale, the step of carrying out this first scanning comprises a plurality of block datas with a plurality of drive integrated circults different time point input one present picture data in this picture frame demonstration time; And
In this picture frame demonstration time, carry out one second scanning, and in one second demonstration time the corresponding voltage of input one black picture data, wherein this first demonstration time and this second demonstration time show the time less than this picture frame respectively, and this first demonstration time of modulation and this second demonstration time equal this picture frame and show the time to obtain adding up this first demonstration time and this second demonstration time, the step of carrying out this second scanning comprises with above-mentioned these drive integrated circults different time point in this picture frame demonstration time imports the black picture data of a plurality of blocks, and should comprise the black picture data of above-mentioned these blocks by black picture data.
2. liquid crystal display driving method according to claim 1 is characterized in that, this first demonstration time equals this second demonstration time.
3. liquid crystal display driving method according to claim 1 is characterized in that, this first demonstration time is less than this second demonstration time.
4. liquid crystal display driving method according to claim 1 is characterized in that, this first demonstration time is greater than this second demonstration time.
5. liquid crystal display driving method according to claim 1 is characterized in that, carry out this second scanning step the time liquid crystal molecule reach grey black rank by this target gray scale transition.
6. liquid crystal display driving method comprises:
In the picture frame demonstration time, carry out one first scanning, and drive liquid crystal molecule transition in one first demonstration time with a superpotential and reach the required angle of a target gray scale, the step of carrying out this first scanning comprises with a plurality of drive integrated circults imports a present picture data in this picture frame demonstration time; And
In this picture frame demonstration time, carry out one second scanning, and in one second demonstration time the corresponding voltage of input one black picture data, wherein this first demonstration time and this second demonstration time show the time less than this picture frame respectively, and this first demonstration time of modulation and this second demonstration time equal this picture frame and show the time to obtain adding up this first demonstration time and this second demonstration time, and the step of carrying out this second scanning comprises import in this picture frame demonstration time with above-mentioned these drive integrated circults should deceive picture data.
7. liquid crystal display driving method according to claim 6 is characterized in that, this first demonstration time equals this second demonstration time.
8. liquid crystal display driving method according to claim 6 is characterized in that, this first demonstration time is less than this second demonstration time.
9. liquid crystal display driving method according to claim 6 is characterized in that, this first demonstration time is greater than this second demonstration time.
10. liquid crystal display driving method according to claim 6 is characterized in that, carry out this second scanning step the time liquid crystal molecule reach grey black rank by this target gray scale transition.
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| Application Number | Priority Date | Filing Date | Title |
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| CN200610136198A CN100578304C (en) | 2006-10-11 | 2006-10-11 | Driving method of liquid crystal display and device thereof |
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| CN200610136198A CN100578304C (en) | 2006-10-11 | 2006-10-11 | Driving method of liquid crystal display and device thereof |
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| CN101162302A CN101162302A (en) | 2008-04-16 |
| CN100578304C true CN100578304C (en) | 2010-01-06 |
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Families Citing this family (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| TWI426494B (en) * | 2009-10-14 | 2014-02-11 | Innolux Corp | Active matrix type liquid crystal display device and related driving methods |
| CN102566114B (en) * | 2012-01-11 | 2014-07-09 | 中国科学院长春光学精密机械与物理研究所 | GPU (graphic processing unit)-assisted transition grayscale driving method of liquid crystal wave-front corrector |
| CN109166545B (en) * | 2018-09-27 | 2022-02-22 | 京东方科技集团股份有限公司 | Driving method and driving device of AR/VR (augmented reality/virtual reality) display equipment and display equipment |
| CN111613188B (en) * | 2020-06-28 | 2023-08-25 | 京东方科技集团股份有限公司 | Display panel driving method, display panel and display device |
| CN114267303B (en) * | 2021-12-31 | 2022-08-09 | 北京显芯科技有限公司 | Method, device and equipment for adjusting brightness |
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