CN104050931A - Method for reducing trailing phenomenon of liquid crystal screen and liquid crystal display device - Google Patents
Method for reducing trailing phenomenon of liquid crystal screen and liquid crystal display device Download PDFInfo
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- CN104050931A CN104050931A CN201310076802.6A CN201310076802A CN104050931A CN 104050931 A CN104050931 A CN 104050931A CN 201310076802 A CN201310076802 A CN 201310076802A CN 104050931 A CN104050931 A CN 104050931A
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Abstract
The invention discloses a method for reducing a trailing phenomenon of a liquid crystal screen and a liquid crystal display device. Therefore, a pheromone of display trailing of the existing liquid crystal screen in the prior art can be avoided. The method comprises: backlight of a backlight module group is divided into at least two segments and each segment of backlight corresponds to one segment of liquid crystal screen; and within the time for scanning one frame of image, only the segment of scanned backlight corresponding to the segment of liquid crystal screen is turned on. The device at least includes an SOC main board, a TCON board, a liquid crystal screen, an LED drive unit and LED backlight; the LED backlight is divided into multiple segments and each segment of backlight corresponds to one segment of liquid crystal screen; and the TCON board outputs a control signal, so that only the segment of scanned backlight corresponding to the segment of liquid crystal screen is turned on within the time for scanning one frame of image. According to the invention, on the basis of the segmented backlight zone mode, backlight in corresponding areas at the backlight area of the liquid crystal screen are only turned on at corresponding specific time, thereby effectively reducing the motion image trailing phenomenon of the television set.
Description
Technical field
The present invention relates to televisor and image Display Processing Technology, relate in particular to a kind of method and liquid crystal indicator that reduces liquid crystal display conditions of streaking.
Background technology
Along with TV industry development with rapid changepl. never-ending changes and improvements, people grow with each passing day for the pursuit of the visual impact of watching television.Whether the image of high-speed motion can show clearly, is the focus that consumers in general pay close attention to, and is also that research staff should explore and improved emphasis.
Conditions of streaking refers to the phenomenon that the edge that display device occurs when showing dynamic image is scared, do not see details.The phenomenon of current LCD TV ubiquity hangover, this is to be determined by the principle of luminosity of LCD TV and liquid crystal response time.Although LCD TV makes some progress on solution tailing problem now, also cannot fundamentally solve within considerable time.
Summary of the invention
For the problems referred to above, the object of the present invention is to provide a kind of method and liquid crystal indicator that reduces liquid crystal display conditions of streaking, effectively reduce the conditions of streaking of liquid crystal display.
For achieving the above object, a kind of method that reduces liquid crystal display conditions of streaking of the present invention, is divided at least two sections by the backlight of backlight module, every section of corresponding one section of liquid crystal display backlight, at scanning one two field picture in time used, only open current this section of liquid crystal display scanning corresponding this section backlight.
Preferably, when scanning present segment liquid crystal display reference position, output synchronizing signal is to open this section of corresponding LED-backlit, and when having scanned this section of liquid crystal display, output synchronizing signal is to turn-off the LED-backlit of this correspondence section.
Preferably, every two field picture is scanned to the time used and by hop count backlight, be divided into a plurality of time periods, in set time section, sequentially each section of liquid crystal display scanned; Export on a time period synchronizing signal and send to open this section of corresponding LED-backlit simultaneously.
Preferably, the backlight of LCDs is divided into 3 sections or 6 sections.
What preferably, scan opens in required sweep time in correspondence at twice or repeatedly when section is backlight.
For achieving the above object, a kind of liquid crystal indicator that reduces liquid crystal display conditions of streaking of the present invention, at least comprises SOC mainboard, TCON plate, liquid crystal display, LED driver element and LED-backlit, wherein,
SOC mainboard, sends LVDS signal to TCON plate;
TCON plate, receives after the processing of LVDS signal, sends STV signal to LED driver element; Send simultaneously and drive signal to liquid crystal display gated sweep;
LED driver element, receives STV signal and processes backward LED-backlit and send backlight control signal and open backlight;
Wherein,
Described LED-backlit is divided into multistage, every section of corresponding one section of liquid crystal display backlight;
Described TCON plate output control signal is so that in a two field picture scans the time used, only open current this section of liquid crystal display scanning corresponding this section backlight.
Preferably,
Described TCON plate is when scanning present segment liquid crystal display reference position, output synchronizing signal sends to LED and drives to open this section of corresponding LED-backlit, and when having scanned this section of liquid crystal display, output synchronizing signal sends to the LED-backlit that LED drives to turn-off this correspondence section.
Preferably,
Every two field picture is scanned to the time used and by hop count backlight, be divided into a plurality of time periods;
When described TCON plate is received frame synchronizing signal, sequentially each section of liquid crystal display scanned, export on a time period synchronizing signal simultaneously and drive to open this section of corresponding LED-backlit to LED.
Preferably, described STV signal only sends once in every two field picture scans the time used.
Beneficial effect of the present invention is:
The present invention utilizes backlight area segmented mode, make the corresponding region of backlight area in LCD screen only in corresponding special time, light backlight, and the brightness that scanning backlight causes reduces and to utilize motor current to compensate, the flicker that scanning backlight causes by improving backlight subarea, reduce opening time backlight and compensate.Effectively reduce the moving image conditions of streaking of TV, compare with the TV that input brush screen rate is higher, utilize liquid crystal display cheaply to realize the display effect of low conditions of streaking; Utilize multi partition backlight to reduce the scintillation that scanning brings simultaneously.
Accompanying drawing explanation
Fig. 1 is that in one embodiment of the invention, backlight area is divided three sections of schematic diagram that carry out scanning backlight;
Fig. 2 is one section of schematic diagram of scanning at twice backlight in one embodiment of the invention;
Fig. 3 is the comparison diagram before and after one embodiment of the invention scanning backlight;
Fig. 4 is the system chart that reduces the method for liquid crystal display conditions of streaking described in the embodiment of the present invention.
Embodiment
Below in conjunction with Figure of description, the present invention will be further described.
Conditions of streaking refers to the phenomenon that the edge that display device occurs when showing dynamic image is scared, do not see details.The phenomenon of current LCD TV ubiquity hangover, this is to be determined by the principle of luminosity of LCD TV and liquid crystal response time.
For above-mentioned situation, a kind of method that reduces liquid crystal display conditions of streaking of the present invention, the method is: by the multistage that is divided into backlight of backlight module, every section of corresponding one section of liquid crystal display backlight, at scanning one two field picture in time used, only open current this section of liquid crystal display scanning corresponding this section backlight.The method provides a kind of can realize covert black plug effect by scanning backlight, with this, solves the dimmed and flicker problem of brightness.Briefly, exactly in a two field picture scans the time used, on liquid crystal display, corresponding region is only lighted backlight within the specific time.In order better to understand this principle, make some embodiment here and explain:
Embodiment 1:
The concrete steps of the present embodiment are as follows:
1, the backlight area of display screen is divided into multistage region; For example, can divide with the quantity of LED lamp bar, suppose that the lamp number of LED is for having arranged from top to bottom 6, described backlight area can be divided into 2,3 or 6 from top to bottom.The display screen of corresponding each backlight area is also divided into 2,3 or 6 regions.
2, according to the hop count of backlight area, the one two field picture time used is divided into 2,3 or 6 time periods;
3, according to order from top to bottom (otherwise or), scan every section of display screen, order is opened each backlight area on a time period simultaneously.
Be convenient to understand, with specific embodiment, explain:
As shown in Figure 1, within the time of a two field picture, screen is equally divided into 3 parts from top to bottom, and when N two field picture shows, it is backlight that the t1 time is beaten bright first paragraph, and it is backlight that the t2 time is beaten bright second segment, the t3 time beat bright the 3rd section backlight; Next frame image comes interim, and constantly again to beat bright first paragraph backlight for t4.Therefore, when image is during from N frame to N+1 frame, t2 to t3 during this period of time in, first paragraph is backlight not to work, and is equivalent to covert black plug.As can be seen from Figure 1, this scanning backlight is equivalent to certain section of time black plug in a two field picture.
According to the method for above-described embodiment 1, can realize: only open current this section of liquid crystal display scanning corresponding this section backlight, thereby can realize covert black plug effect, with this, solve the dimmed and flicker problem of brightness.Because a two field picture T.T. is fixed, backlight segment number is more, and every section of opening time backlight is shorter, and corresponding brightness will be lower.Now, need to promote the reduction that LED drive current makes up LED brightness.
General, the matching relationship of opening time backlight and liquid crystal upset is: the rise time 3.4ms of liquid crystal response and fall time 5.85ms, the scope of their institute's values is that amplitude that liquid crystal begins turning is maximum amplitude 10%---90%, and the hold region of liquid crystal is the region between rise time and fall time.In this region, liquid crystal is considered as overturning, and backlightly should open in this region in theory, and effect could be best.Light and ought more mate with opening time backlight flip-flop transition by the section corresponding liquid crystal in region backlight, scanning effect can be better.Due to screen, the liquid crystal in level is different flip-flop transition from top to bottom, therefore need corresponding backlight opening after liquid crystal upset, be coupling.
Empirical tests, when backlight area is divided into more than six sections, LED current boost multiple can be too high, thereby can affect the serviceable life of lamp bar; And subregion is while being less than six sections, backlightly can not well mate flip-flop transition with the liquid crystal of respective regions, the DeGrain of improvement, adopts six sections of scan modes backlight therefore best.
In order to solve screen flicker problem, need be at a two field picture in the time used in the screen flicker that multistage backlight area is corresponding to be occurred in lighting process, every time through a time period, backlight area section corresponding in this time period is lighted at twice or repeatedly.Below in conjunction with embodiment 2, be described further:
Embodiment 2:
The concrete control step of this embodiment below:
1, the backlight area of display screen is divided into multistage region;
2,, by two field picture time division time section used, the hop count of its time period is identical with the hop count that backlight area is divided;
3,, at a two field picture in the time used, every time through a time period, corresponding backlight area section is corresponding lighting in order, and corresponding backlight area more than at twice or twice is lighted in this time period.
Be convenient to understand, with specific embodiment, explain:
As shown in Figure 1, within the time of a two field picture, screen is equally divided into 3 parts from top to bottom, when N two field picture shows, t1 in the time, beat for the first time bright first paragraph backlight after, after the delay of certain hour, again light first paragraph backlight; Beat in the t2 time bright second segment backlight after, after the delay of certain hour, again light second segment backlight; Beat in the t3 time bright the 3rd section backlight after, after the delay of certain hour, again light the 3rd section backlight.
As shown in Figure 2, t1 is the first paragraph corresponding liquid crystal upset hold region time used backlight, and first paragraph is backlight should be opened in t1.In like manner, second segment is backlight should be opened in t2, the 3rd section of backlight should opening in t3.Can find out in the drawings, every section backlight once opens with twice and opens when corresponding time interscan, can draw sequential relationship during scanning backlight from this figure.
According to the method for above-described embodiment 2, can realize equally only open current this section of liquid crystal display scanning corresponding this section backlight, thereby can realize covert black plug effect, with this, solve the dimmed and flicker problem of brightness.Comparison diagram before and after scanning backlight as shown in Figure 3.Wherein, every group of column diagram left side be the hangover effect before scanning backlight, the right is the hangover effect after scanning backlight.Horizontal ordinate is nine points of screen, and ordinate is the response time.Because hangover is by liquid crystal response Time dependent, therefore measure respectively, do liquid crystal response rise time at nine the some places of screen before and after scanning backlight and fall time as a comparison.As can be seen from Figure, do not sweep the liquid crystal rise time while having the time of 7 points to be all greater than scanning backlight liquid crystal rise time when backlight; Liquid crystal fall time when not sweeping liquid crystal when backlight simultaneously and having 8 points to be greater than scanning backlight the fall time.Not sweeping liquid crystal when backlight averaging time of rising is 6.97ms, and not sweeping liquid crystal when backlight averaging time that declines is 8.23ms; Liquid crystal during scanning backlight averaging time of rising is 4.51ms, and liquid crystal during scanning backlight averaging time that declines is 4.77ms.Correlation data is known, has done after scanning backlight, and hangover effect has had very large improvement.
In order to solve TV conditions of streaking, a kind of liquid crystal indicator that reduces liquid crystal display conditions of streaking of the present invention, at least comprises liquid crystal display, LED driver element and the LED-backlit of SOC mainboard, TCON plate, 60Hz refresh rate TV, wherein,
SOC mainboard, sends LVDS signal to TCON plate;
TCON plate, receives after the processing of LVDS signal, sends STV signal to LED driver element; Send simultaneously and drive signal to liquid crystal display gated sweep;
LED driver element, receives STV signal and processes backward LED-backlit and send backlight control signal and open backlight;
Wherein,
Described LED-backlit is divided into multistage, every section of corresponding one section of liquid crystal display backlight;
Described TCON plate output control signal is so that in a two field picture scans the time used, only open current this section of liquid crystal display scanning corresponding this section backlight.
Above-mentioned liquid crystal indicator can have multiple implementation to complete, and now by two embodiment, is illustrated.
Embodiment 3:
As shown in Figure 4, SOC mainboard sends LVDS signal to TCON plate, described TCON plate is when scanning present segment liquid crystal display reference position, output synchronizing signal sends to LED and drives to open this section of corresponding LED-backlit, and when having scanned this section of liquid crystal display, output synchronizing signal sends to the LED-backlit that LED drives to turn-off this correspondence section.
Concrete, shown in seeing figures.1.and.2, within the time of a two field picture, screen is equally divided into 3 parts from top to bottom, when N frame (present frame) image shows, by the t1 time, TCON plate is output signal scanning first paragraph liquid crystal display reference position when the t1 time starts, and exports synchronizing signal simultaneously and sends to LED and drive and open corresponding first paragraph LED-backlit; When this section of liquid crystal display scanned, the t1 time finishes, and TCON plate output synchronizing signal sends to LED and drives to turn-off this section of LED-backlit.
Now the t2 time starts simultaneously, and TCON plate is output signal scanning second segment liquid crystal display reference position when the t2 time starts, and exports synchronizing signal simultaneously and sends to LED and drive and open corresponding second segment LED-backlit; When this section of liquid crystal display scanned, the t2 time finishes, and TCON plate output synchronizing signal sends to LED and drives to turn-off second segment LED-backlit.
When the t2 time finishes, the t3 time, TCON plate is the 3rd section of liquid crystal display reference position of output signal scanning when the t3 time starts, and exports synchronizing signal simultaneously and send to the 3rd section of LED-backlit that correspondence is opened in LED driving; When this section of liquid crystal display scanned, the t3 time finishes, and TCON plate output synchronizing signal sends to LED and drives to turn-off the 3rd section of LED-backlit, and now this two field picture has all scanned.
And then TCON plate output signal is to show N+1 frame.Continue since the t1 time of N+1 frame, TCON plate is output signal scanning first paragraph liquid crystal display reference position when the t1 time of N+1 frame starts, and exports synchronizing signal simultaneously and sends to LED and drive and open corresponding first paragraph LED-backlit; When this section of liquid crystal display scanned, the t1 time finishes, and TCON plate output synchronizing signal sends to LED and drives to turn-off this section of LED-backlit.The t2 time starts simultaneously ..., according to this repeatedly.
In the present embodiment, each section of backlight area is that the position at the whole story of the display screen that scans according to TCON plate is opened or turn-offed.
Embodiment 4:
In the present embodiment, every two field picture is scanned to the time used and by hop count backlight, is divided into a plurality of regular time section, TCON plate according to this regular time section to open every section of backlight area specific as follows:
SOC mainboard sends LVDS signal to TCON plate, when described TCON plate is received frame synchronizing signal, sequentially each section of liquid crystal display is scanned, and drives to open this section of corresponding LED-backlit by set time section output synchronizing signal to LED simultaneously.The principle of the present embodiment is, because the time that every two field picture is used is fixed,
And the hop count that display screen is divided into is also fixed, therefore the time that every section of display screen is scanned is also fixed, so, when TCON plate only need to be received frame synchronizing signal, by set time section output synchronizing signal, to open this section of corresponding LED-backlit, also can realize the present invention simultaneously, and not need to judge by TCON the position that present segment display screen scans.
Generally speaking, controlling chip backlight is single MCU.Scanning backlight under this chip controls 3D state.This chip is judged 3D state by receiving from the VSYNC signal on TCON plate, then according to chip program, controls scanning backlight and realize 3D effect.The present invention becomes STV signal decision signal from VSYNC, and STV signal is the signal sending from TCON plate under 2D state, and the every two field picture of this signal sends once, and by the program setting of chip, when receiving STV signal, backlight beginning scanned.
In summary, in the present embodiment, liquid crystal display scanning, if embodiment 3 is identical, is all to scan according to the order of sequence, for example: from top to bottom or from top to bottom (also can from left to right or from right to left); Different, each section of backlight area lighted according to fixing (specific) time, and do not need to consider position that liquid crystal display scans.Can reduce the complexity of system like this.
Above; be only preferred embodiment of the present invention, but protection scope of the present invention is not limited to this, is anyly familiar with those skilled in the art in the technical scope that the present invention discloses; the variation that can expect easily or replacement, within all should being encompassed in protection scope of the present invention.Therefore, protection scope of the present invention should be as the criterion with the protection domain that claim was defined.
Claims (10)
1. a method that reduces liquid crystal display conditions of streaking, it is characterized in that, the backlight of backlight module is divided into at least two sections, every section of corresponding one section of liquid crystal display backlight, at scanning one two field picture in time used, only open current this section of liquid crystal display scanning corresponding this section backlight.
2. the method for reduction liquid crystal display conditions of streaking according to claim 1, it is characterized in that, when scanning present segment liquid crystal display reference position, output synchronizing signal is to open this section of corresponding LED-backlit, and when having scanned this section of liquid crystal display, output synchronizing signal is to turn-off the LED-backlit of this correspondence section.
3. the method for reduction liquid crystal display conditions of streaking according to claim 1, is characterized in that, every two field picture is scanned to the time used and by hop count backlight, be divided into a plurality of time periods, in set time section, sequentially each section of liquid crystal display is scanned; Export on a time period synchronizing signal and send to open this section of corresponding LED-backlit simultaneously.
4. the method for reduction liquid crystal display conditions of streaking according to claim 1, is characterized in that, the backlight of LCDs is divided into 3 sections or 6 sections.
5. the method for reduction liquid crystal display conditions of streaking according to claim 1, is characterized in that, what scan opens in required sweep time in correspondence at twice or repeatedly when section is backlight.
6. reduce a liquid crystal indicator for liquid crystal display conditions of streaking, at least comprise SOC mainboard, TCON plate, liquid crystal display, LED driver element and LED-backlit, wherein,
SOC mainboard, sends LVDS signal to TCON plate;
TCON plate, receives after the processing of LVDS signal, sends STV signal to LED driver element; Send simultaneously and drive signal to liquid crystal display gated sweep;
LED driver element, receives STV signal and processes backward LED-backlit and send backlight control signal and open backlight;
It is characterized in that,
Described LED-backlit is divided into multistage, every section of corresponding one section of liquid crystal display backlight;
Described TCON plate output control signal is so that in a two field picture scans the time used, only open current this section of liquid crystal display scanning corresponding this section backlight.
7. the liquid crystal indicator of reduction liquid crystal display conditions of streaking according to claim 6, is characterized in that, concrete:
Described TCON plate is when scanning present segment liquid crystal display reference position, output synchronizing signal sends to LED and drives to open this section of corresponding LED-backlit, and when having scanned this section of liquid crystal display, output synchronizing signal sends to the LED-backlit that LED drives to turn-off this correspondence section.
8. the liquid crystal indicator of reduction liquid crystal display conditions of streaking according to claim 6, is characterized in that, concrete:
Every two field picture is scanned to the time used and by hop count backlight, be divided into a plurality of time periods;
When described TCON plate is received frame synchronizing signal, sequentially each section of liquid crystal display scanned, export on a time period synchronizing signal simultaneously and drive to open this section of corresponding LED-backlit to LED.
9. the liquid crystal indicator of reduction liquid crystal display conditions of streaking according to claim 6, is characterized in that, described STV signal only sends once in every two field picture scans the time used.
10. the liquid crystal indicator of reduction liquid crystal display conditions of streaking according to claim 6, is characterized in that, described liquid crystal display is the liquid crystal display of 60Hz refresh rate TV.
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Application publication date: 20140917 |