CN106205497B - A kind of method for controlling backlight thereof, device and liquid crystal display device - Google Patents
A kind of method for controlling backlight thereof, device and liquid crystal display device Download PDFInfo
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- CN106205497B CN106205497B CN201510213417.0A CN201510213417A CN106205497B CN 106205497 B CN106205497 B CN 106205497B CN 201510213417 A CN201510213417 A CN 201510213417A CN 106205497 B CN106205497 B CN 106205497B
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- 239000004973 liquid crystal related substance Substances 0.000 title claims abstract description 73
- 238000000034 method Methods 0.000 title claims abstract description 22
- 238000005286 illumination Methods 0.000 claims abstract description 79
- 239000000463 material Substances 0.000 claims description 14
- 238000012544 monitoring process Methods 0.000 claims description 8
- 210000002858 crystal cell Anatomy 0.000 claims description 6
- 238000004364 calculation method Methods 0.000 claims description 2
- 230000000694 effects Effects 0.000 abstract description 12
- 230000002688 persistence Effects 0.000 abstract description 4
- 238000010586 diagram Methods 0.000 description 16
- 230000004044 response Effects 0.000 description 15
- 238000004590 computer program Methods 0.000 description 7
- 230000014759 maintenance of location Effects 0.000 description 7
- 238000012986 modification Methods 0.000 description 5
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- 230000008569 process Effects 0.000 description 5
- 238000012545 processing Methods 0.000 description 5
- 230000006870 function Effects 0.000 description 3
- 238000005192 partition Methods 0.000 description 3
- 230000036632 reaction speed Effects 0.000 description 3
- 206010019133 Hangover Diseases 0.000 description 2
- 230000008901 benefit Effects 0.000 description 2
- 239000013078 crystal Substances 0.000 description 2
- 239000007788 liquid Substances 0.000 description 2
- 230000002085 persistent effect Effects 0.000 description 2
- 230000000007 visual effect Effects 0.000 description 2
- 238000012935 Averaging Methods 0.000 description 1
- 238000004422 calculation algorithm Methods 0.000 description 1
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- 125000004122 cyclic group Chemical group 0.000 description 1
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Abstract
The invention discloses a kind of method for controlling backlight thereof, device and liquid crystal display devices, since main contents include: monitor to drive scanning the first row pixel in current image frame Nth row picture portion when, the backlight of backlight subarea is closed into t duration, t is the scanning black plug time, after the backlight of backlight subarea is closed t duration, the backlight of backlight subarea is opened into preset duration, and brightness needed for the backlight illumination of current backlight subarea is met, after the backlight of backlight subarea is opened preset duration, the backlight of backlight subarea is set off.To, the trailing phenomenon generated due to persistence of vision effect is effectively improved, meanwhile, guarantee that the backlight illumination of each backlight subarea is identical, improve the brightness homogeneity of backlight subarea, effectively improves the display quality of liquid crystal display device.
Description
Technical field
The present invention relates to technical field of liquid crystal display more particularly to a kind of method for controlling backlight thereof, device and liquid crystal display dress
It sets.
Background technique
It is growing day by day for the pursuit of the display effect of liquid crystal display with the development that liquid crystal display industry is maked rapid progress,
Whether it is capable of the display of clear and smooth particularly with the picture of high-speed motion, is the majority of consumers' focus of attention problem the most.
However, in current liquid crystal display, generally existing trailing phenomenon, and the trailing phenomenon seriously affect it is aobvious
Show the clear and smooth degree of picture.Why trailing phenomenon can be generated, this is the vision by liquid crystal response time response and human eye
What persistence characteristic determined.
It is the schematic diagram of the response time properties of liquid crystal: due to the characteristic of liquid crystal material itself, in liquid as shown in Fig. 1 (a)
When crystal display is driven by voltage, liquid crystal molecule can deflect, from the corresponding angular deflection of a voltage to another electricity
Corresponding angle is pressed, thus, so that the transmitance of light changes.However, this deflection has certain process, the process pair
The time answered is the response time of liquid crystal.If the response time is smaller, smear effects are smaller.
As shown in Fig. 1 (b), be the schematic diagram of eye storage characteristic: when light incidence enters human eye, visual persistence can cause
One response time watches the nth frame of dynamic image at this time, has a time and persists effect, and retain to N+1 frame, changes
Yan Zhi sees the image of two frames simultaneously on N+1 frame picture, therefore trailing phenomenon is more obvious.
There are many existing schemes for solving trailing phenomenon, such as: in the way of black plug, it is inserted between two field pictures
The completely black black field of a frame, so as to become present nth frame image, N+1 frame black for original nth frame image, N+1 frame image
Field, N+2 frame image.At this point, human eye persists the black field that effect largely appears in N+1 frame to the visual angle of nth frame image,
And N+2 frame image will be relatively much smaller by the effect of nth frame image persistance, to effectively improve trailing phenomenon, makes
It must show the relatively clear smoothness of picture.
However, improving the scheme of trailing phenomenon above by black plug mode, display picture can be given to bring, and brightness is dimmed, dodges
Therefore the ill effects such as bright, edge sharpening need the scheme for finding a kind of solution tailing problem more optimized.
Summary of the invention
The embodiment of the present invention provides a kind of method for controlling backlight thereof, device and liquid crystal display device, to solve the prior art
It is middle to there are problems that liquid crystal display picture hangover is effectively improved.
The embodiment of the present invention uses following technical scheme:
A kind of method for controlling backlight thereof, suitable for liquid crystal display device, and the backlight module of the liquid crystal display device uses
Backlight subarea control, which comprises
It is executed following for the corresponding backlight subarea of Nth row picture portion in current image frame according to driving scanning sequency
Black plug operation:
When the first row pixel starts driving scanning in monitoring current image frame Nth row picture portion, by the backlight
The backlight of subregion closes t duration, wherein the t is the scanning black plug time, and the scanning black plug time is greater than zero, and being less than should
The frame cycle duration of current image frame；
After the backlight of the backlight subarea is closed t duration, the backlight of the backlight subarea is opened default
Duration, and the backlight illumination of current backlight subregion is made to meet required brightness；
After the backlight of the backlight subarea is opened preset duration, set the backlight of the backlight subarea to
It closes.
Preferably, scanning black plug time t search by default scanning black plug timetable and be calculated；
Wherein, the liquid crystal display device is had recorded in different driving scanning voltage in the default scanning black plug timetable
Under row pixel opening time.
Preferably, the scanning black plug time t is calculated by the following formula to obtain:
Wherein, the N is the row number of pixels for including in current backlight subregion, and the γ is the viscous system of liquid crystal material
Number, the d are liquid crystal cell spacing, and the Δ ε is the dielectric coefficient of liquid crystal material, and the v is driving scanning voltage, the vthFor
Predetermined threshold value voltage.
Preferably, the preset duration determines in the following manner:
According to backlight illumination needed for the backlight subarea and current backlight driving current, the duty of current backlight subregion is determined
Than；
According to the frame cycle duration of the determining duty ratio and current image frame, the default of current backlight subregion is determined
Duration, wherein the preset duration is the backlight opening time of current backlight subregion.
Preferably, the duty ratio of the current backlight subregion is determined especially by following formula:
D '=T*D/ (T-t)/K (2)
Wherein, the D ' is the duty ratio of current backlight subregion, and the T is the frame cycle duration of current image frame, the D
The duty ratio of backlight subarea when not to be scanned black plug operation, when the t is current backlight subregion corresponding scanning black plug
Between, the K is the backlight illumination coefficient of current backlight subregion.
Preferably, the duty ratio of the current backlight subregion is determined especially by following formula:
D '=[T*D/ (T-t)+K ']/K (3)
Wherein, the D ' is the duty ratio of current backlight subregion, and the T is the frame cycle duration of current image frame, the D
The duty ratio of backlight subarea when not to be scanned black plug operation, when the t is current backlight subregion corresponding scanning black plug
Between, the K ' is the grayscale value compensation system corresponding with the grayscale value of previous image frame of the current image frame of the backlight subarea
Number, the K are the backlight illumination coefficient of current backlight subregion.
A kind of backlight control apparatus, suitable for liquid crystal display device, and the backlight module of the liquid crystal display device uses
Backlight subarea control, described device include:
Monitoring unit is scanned, for monitoring the first row pixel in the corresponding picture portion of current backlight subregion；
Timing control unit, when for driving scanning since the first row pixel of current image frame Nth row picture portion,
The backlight of the backlight subarea is closed into t duration, wherein the t is the scanning black plug time, and the scanning black plug time is greater than
Zero, less than the frame cycle duration of the current image frame；And
For after the backlight of the backlight subarea is closed t duration, the backlight of the backlight subarea to be opened
Preset duration, and the backlight illumination of current backlight subarea is made to meet required brightness；And
For after the backlight of the backlight subarea is opened preset duration, the backlight of the backlight subarea to be set
It is set to closing.
Preferably, described device further include:
The default scanning black plug time is calculated for searching from default scanning black plug timetable in searching unit；
Wherein, the liquid crystal display device is had recorded in different driving scanning voltage in the default scanning black plug timetable
Under row pixel opening time.
Preferably, described device further include:
Computing unit, for the scanning black plug time to be calculated using following formula,
Wherein, the N is the row number of pixels for including in current backlight subregion, and the γ is the viscous of liquid crystal material
Coefficient, the d are liquid crystal cell spacing, and the Δ ε is the dielectric coefficient of liquid crystal material, and the v is driving scanning voltage, the vth
For predetermined threshold value voltage.
Preferably, described device further include:
First determination unit is used for the backlight illumination according to needed for the backlight subarea and current backlight driving current, determines
The duty ratio of current backlight subregion；
Second determination unit, the frame week of duty ratio and current image frame for being determined according to first determination unit
Phase duration determines the preset duration of current backlight subregion, wherein the preset duration is that the backlight of current backlight subregion is opened
Duration.
Preferably, second determination unit, specifically for determining the duty ratio by following formula:
D '=T*D/ (T-t)/K (2)
Wherein, the D ' is the duty ratio of current backlight subregion, and the T is the frame cycle duration of current image frame, the D
The duty ratio of backlight subarea when not to be scanned black plug operation, the t are in the corresponding picture portion of current backlight subregion
The driving sweep time of all row pixels, the K are the backlight illumination coefficient of current backlight subregion.
Preferably, second determination unit, specifically for determining the duty ratio by following formula:
D '=[T*D/ (T-t)+K ']/K (3)
Wherein, the D ' is the duty ratio of current backlight subregion, and the T is the frame cycle duration of current image frame, the D
The duty ratio of backlight subarea when not to be scanned black plug operation, the t1 are in the corresponding picture portion of current backlight subregion
The driving sweep time of all row pixels, the K ' are the grayscale value and previous image frame of the current image frame of the backlight subarea
The corresponding penalty coefficient of grayscale value, the K be current backlight subregion backlight illumination coefficient.
A kind of liquid crystal display device, including the backlight control apparatus.
By above-mentioned backlight control scheme, scanning is formed using the multi partition control system of backlight scanning for picture frame and is inserted
It is black, when corresponding multiple row pixels carry out driving scanning in each backlight subarea, the time of black plug is dispersed to driving as far as possible and is swept
The time retouched, and drive scanning to complete completely in multiple row pixels and then carry out the brightness adjustment of backlight subarea, specifically,
For any backlight subarea, in the backlight subarea, the first row pixel of corresponding picture portion starts driving scanning start time,
The backlight of the backlight subarea is closed to the scanning black plug time being calculated, then, the backlight of the backlight subarea is opened
Preset duration, so that the backlight illumination of current backlight subregion meets required brightness, finally, turning off the backlight of the backlight subarea
Lamp.To by the backlight control mode of backlight subarea, and combine the black plug mode of scanning black plug, effectively improve due to view
Feel the trailing phenomenon for persisting effect and generating, simultaneously as using scanning black plug, avoids existing complete black plug and cause
The excessively dark problem of backlight illumination.It is adjusted flexibly within the period for the backlight for opening preset duration moreover, the present invention passes through
Backlight illumination ensure that the backlight illumination of each backlight subarea and backlight illumination when not black plug are close to the greatest extent, meanwhile, also
It can guarantee that the backlight illumination of each backlight subarea is identical by the adjustment of the backlight illumination in the period, improve backlight point
The brightness homogeneity in area effectively improves the display quality of liquid crystal display device.In addition, it is contemplated that liquid crystal reaction speed it is relatively slow and
Caused image retention trailing phenomenon, the present invention additionally use zonal control compensate liquid crystal response speed it is slow caused by brightness
Deviation, thus, reduce the image retention between consecutive frame, reduces trailing phenomenon to the greatest extent.
Detailed description of the invention
To describe the technical solutions in the embodiments of the present invention more clearly, make required in being described below to embodiment
Attached drawing is briefly introduced, it should be apparent that, drawings in the following description are only some embodiments of the invention, for this
For the those of ordinary skill in field, without any creative labor, it can also be obtained according to these attached drawings
His attached drawing.
Fig. 1 (a) is the schematic diagram of the response time properties of liquid crystal in the prior art；
Fig. 1 (b) is the schematic diagram of the eye storage characteristic of liquid crystal in the prior art；
Fig. 2 is a kind of flow diagram of method for controlling backlight thereof provided in an embodiment of the present invention；
Fig. 3 is the look-up table of penalty coefficient K ' in the embodiment of the present invention；
Fig. 4 is a kind of structural schematic diagram of backlight control apparatus provided in an embodiment of the present invention；
Fig. 5 is the structural schematic diagram of another backlight control apparatus provided in an embodiment of the present invention；
Fig. 6 is the structural schematic diagram of the third backlight control apparatus provided in an embodiment of the present invention.
Specific embodiment
To make the objectives, technical solutions, and advantages of the present invention clearer, below in conjunction with attached drawing to the present invention make into
It is described in detail to one step, it is clear that described embodiments are only a part of the embodiments of the present invention, rather than whole implementation
Example.Based on the embodiments of the present invention, obtained by those of ordinary skill in the art without making creative efforts
All other embodiment, shall fall within the protection scope of the present invention.
In embodiments of the present invention, it by backlight control scheme, is controlled for picture frame using the multi partition of backlight scanning
System forms scanning black plug, and when in each backlight subarea, corresponding multiple row pixels carry out driving scanning, the time of black plug is use up
Amount is dispersed to the time of driving scanning, and drives scanning to complete and then carry out the bright of backlight subarea completely in multiple row pixels
Degree adjustment, specifically, for any backlight subarea, in the backlight subarea, the first row pixel of corresponding picture portion starts to drive
Start time is scanned, the backlight of the backlight subarea is closed to the scanning black plug time being calculated, then, by the backlight subarea
Backlight open preset duration so that current backlight subregion backlight illumination meet needed for brightness, finally, turning off the back
The backlight of light subregion.To by the backlight control mode of backlight subarea, and combine the black plug mode of scanning black plug, effectively
The trailing phenomenon generated due to persistence of vision effect is improved, simultaneously as using scanning black plug, is avoided existing complete
The excessively dark problem of backlight illumination caused by full black plug.Moreover, the present invention passes through the backlight being adjusted flexibly opening preset duration
Backlight illumination in the period of lamp, the backlight illumination and backlight illumination when not black plug that ensure that each backlight subarea to the greatest extent
It is close, at the same time it can also guarantee that the backlight illumination of each backlight subarea is identical by the adjustment of the backlight illumination in the period,
The brightness homogeneity for improving backlight subarea effectively improves the display quality of liquid crystal display device.In addition, it is contemplated that liquid crystal is anti-
Image retention trailing phenomenon caused by answering speed relatively slow, it is slow to compensate liquid crystal response speed that the present invention additionally uses zonal control
Caused by luminance deviation, thus, reduce consecutive frame between image retention, reduce trailing phenomenon to the greatest extent.
Technical solution of the present invention is described in detail below by specific embodiment, the present invention includes but and unlimited
In following embodiment.
As shown in Fig. 2, being a kind of flow diagram of method for controlling backlight thereof provided in an embodiment of the present invention, this method is applicable in
In liquid crystal display device, and the backlight module of the liquid crystal display device is controlled using backlight subarea, below for including 10
The backlight module of backlight subarea is analyzed, then includes 10 picture portions, each backlight subarea corresponding one in current image frame
A picture portion；It is successively held for the corresponding backlight subarea of picture portion each in current image frame according to driving scanning sequency
The following black plug operation of row, it is assumed that the current picture portion for carrying out black plug operation is that (N is less than or equal to Nth row picture portion herein
10):
Step 101: when driving scanning the first row pixel since current image frame Nth row picture portion, by backlight point
The backlight in area closes t duration.
Wherein, t be scanning the black plug time, the scanning black plug time be greater than zero, less than the current image frame the frame period when
It is long.
In addition, it is contemplated that the effect of the scanning black plug time, primarily to the corresponding image of covering current backlight subregion
All row pixel opening times in subregion, therefore, a kind of preferred embodiment, if can accurately know each backlight subarea pair
Time required for all row pixels are opened and (consider the liquid crystal response time) in the picture portion answered, the scanning black plug time
T can be overlapped with the time, i.e., the first row pixel starts that the scanning moment is driven to open in the corresponding picture portion in the backlight subarea
The last line pixel that begins into present image subregion fully opens the moment.
In embodiments of the present invention, the above-mentioned related scanning black plug time can be determined by following two mode:
Mode one: lookup is carried out by default scanning black plug timetable and is calculated；Wherein, the default scanning black plug time
Row pixel scanning time of the liquid crystal display device under different driving scanning voltage is had recorded in table.
Mode two: it is calculated by the following formula to obtain:
Wherein, the N is the row number of pixels for including in current backlight subregion, and the γ is the viscous system of liquid crystal material
Number, the d are liquid crystal cell spacing, and the Δ ε is the dielectric coefficient of liquid crystal material, and the v is driving scanning voltage, the vthFor
Predetermined threshold value voltage.
It should be noted that formula (1) is deformed according to the response time formula of liquid crystal material in fact in mode two
It arrives.
Step 102: after the backlight of backlight subarea is closed t duration, the backlight of backlight subarea being opened default
Duration, and the backlight illumination of current backlight subarea is made to meet required brightness.
Wherein, when using dynamic backlight control algolithm, required brightness can be by the corresponding image ash in each backlight subarea
Rank brightness decision, and the backlight illumination of each backlight subarea is equal or unequal；When using non-dynamic backlight control algorithm, respectively
The backlight illumination of a backlight subarea is absolutely equal close to equal, but not necessarily.
It should be noted that the backlight illumination of backlight subarea is determined jointly by the duty ratio and back facet current of the backlight subarea
Fixed, specially backlight illumination is equal to the duty ratio of backlight subarea and the product of back facet current.Therefore, in the present invention it is possible to
By adjusting the duty ratio of backlight subarea mode or adjust the mode of backlight drive electric current and adjust backlight illumination.
In embodiments of the present invention, in the unfixed situation of backlight drive electric current, based on adjustable backlight duty ratio
Mode is wanted to be adjusted.
In this step 102, which can determine in the following manner:
Firstly, the backlight illumination according to needed for the backlight subarea and current backlight driving current, determine current backlight subregion
Duty ratio.
Then, according to the frame cycle duration of determining duty ratio and current image frame, the pre- of current backlight subregion is determined
If duration, wherein preset duration is the backlight opening time of current backlight subregion.
On the one hand, the duty ratio of current backlight subregion is determined especially by following formula:
D '=T*D/ (T-t1)/K (2)
Wherein, D ' is the duty ratio of current backlight subregion, and T is the frame cycle duration of current image frame, and D is not to be scanned
The duty ratio of backlight subarea when black plug operates, t1 are the driving of all row pixels in the corresponding picture portion of current backlight subregion
Sweep time, K are the backlight illumination coefficient of current backlight subregion.
On the other hand, the duty ratio of current backlight subregion is determined especially by following formula:
D '=[T*D/ (T-t1)+K ']/K (3)
Wherein, D ' is the duty ratio of current backlight subregion, and T is the frame cycle duration of current image frame, and D is not to be scanned
The duty ratio of backlight subarea when black plug operates, t1 are the driving of all row pixels in the corresponding picture portion of current backlight subregion
Sweep time, K ' are the grayscale value compensation system corresponding with the grayscale value of previous image frame of the current image frame of the backlight subarea
Number, K are the backlight illumination coefficient of current backlight subregion.
However, when not being able to satisfy backlight demand still by duty ratio adjustment mode, it can be by adjusting backlight drive electric current
Mode be adjusted, i.e., adjust backlight illumination by changing the size of back facet current.Generally by height-regulating backlight drive
Electric current improves backlight illumination.
In the above-described embodiments, the mode by adjusting duty ratio or backlight drive electric current is adjusted backlight illumination,
So that the backlight illumination of current backlight subregion is identical as the backlight illumination of other backlight subareas, to reach each backlight subarea
The identical effect of backlight illumination.To also improve the uniform of the backlight illumination of backlight subarea while improving trailing phenomenon
Property.
Preferably, in embodiments of the present invention, each backlight subarea can be precomputed in the case where not black plug
Backlight illumination, and the backlight illumination is averaging, obtain the average backlight illumination for each backlight subarea.Then, it is carrying out
When brightness adjustment of the invention, by the backlight illumination of current backlight subregion adjust to the average backlight illumination that precalculates
It is identical, moreover, guaranteeing that the backlight illumination of each backlight subarea is average backlight illumination, equally improving the same of trailing phenomenon
When, improve the homogeneity of the backlight illumination of backlight subarea, moreover, make backlight illumination as far as possible with backlight illumination when non-black plug
It is close, improve display quality.
Step 103: after the backlight of backlight subarea is opened preset duration, setting the backlight of backlight subarea to
It closes.
Since step 101- step 103 of the invention only embodies the cyclic process of a picture frame, by backlight
After the backlight of subregion opens preset duration, the backlight of backlight subarea is set off, until next picture frame arrives
Come, executes the scanning black plug operation in a new period again.
Above scheme is described in more detail below by specific example.
It, should if not considering the scheme of any compensation trailing phenomenon still by taking any backlight subarea in backlight module as an example
The backlight illumination of backlight subarea can be expressed as B=T*D/ (T-t) * Br, wherein B is the backlight illumination of the backlight subarea, and T is
The cycle duration for the picture frame that the display device is currently shown, D are the duty ratio of current backlight subarea, and t is the backlight subarea
The driving sweep time of all row pixels in corresponding picture portion, Br are back facet current Benchmark brightness.
If improving trailing phenomenon in such a way that the black field of a frame carries out black plug according to existing, it will cause current image frames
Luminance distortion (darker).Therefore, it may be considered that entire backlight module is controlled in the way of the backlight control of backlight subarea,
Moreover, being directed to current image frame, black plug is successively carried out to each backlight subarea in the way of scanning, it is the most key, it should
The control of black plug time be greater than zero, less than the current image frame frame cycle duration in the range of, the preferably backlight subarea
Liquid crystal completes the time of driving scanning, and specifically, which can carry out lookup meter by default scanning black plug timetable
It calculates, wherein have recorded the liquid crystal display device under different driving scanning voltage in the default scanning black plug timetable
Row pixel scanning time.Such as: if currently driving scanning voltage is aV, current backlight subregion includes 10 row pixels, then searches
It is ta to corresponding row pixel scanning time (one-row pixels are from driving to the completely open time), learns the backlight by calculating
The scanning black plug time of subregion is 10ta.
After carrying out above-mentioned black plug operation to each backlight subarea according to above-mentioned scanning black plug mode, also to guarantee that this is swept
Black plug operation is retouched while improving trailing phenomenon, the backlight illumination of the backlight subarea will not be reduced too much, therefore, in backlight
In the case that driving current is certain, the time for needing rationally to control backlight open specifically should be from the duty ratio of the backlight subarea
It accounts for.
Firstly, to calculate the backlight illumination of the current backlight subregion in not considering the backlight control scheme under black plug mode.
Due to B=T*D/ (T-t) * Br, wherein B is the backlight illumination of the backlight subarea, and T is that the display device is currently shown
The cycle duration of the picture frame shown, D are the duty ratio of current backlight subarea, and t1 is in the corresponding picture portion in the backlight subarea
The driving sweep time of all row pixels, Br are back facet current Benchmark brightness.
After above-mentioned scanning black plug scheme, it is desirable to which the backlight illumination of backlight subarea is B, and backlight at this time is bright
Spend B=D ' * B '=D ' * K*Br, wherein B ' is the back facet current brightness of current backlight subregion, the backlight subarea after scanning black plug
Duty ratio be D ', by following formula:
B=T*D/ (T-t1) * Br=D ' * B '=D ' * K*Br, calculates:
D '=T*D/ (T-t1)/K (2)
If the cycle duration T of the picture frame currently shown is 8.3ms, the duty ratio D of the backlight subarea before scanning black plug is 50%,
It is 0.9ms, K 2 that the scanning black plug time for the backlight subarea found, which is t, then brings above-mentioned formula (1) into, obtain D '
It is 35.7%.
It should be noted that, in order to preferably embody the effect of black plug, spy will since duty ratio D ' is less than 1
D ' is limited to less than 70%, the value greater than 30%.
Using the cycle duration T=8.3ms of obtained duty ratio D '=35.7% and current image frame, the two is multiplied to obtain
The duration that current backlight subregion is opened, i.e. preset duration are T*D '=8.3*35.7%=3.06ms, this shows in present image
In frame, current backlight subregion will open backlight 3.06ms.
When lower mask body introduction is opening backlight for current backlight subregion, and continues 3.06ms.
In current image frame, the backlight of the backlight subarea from current image frame start time into the backlight subarea most
At the time of one-row pixels fully open afterwards, it is constantly in closed state, the shut-in time is at least 0.9ms, is then turned on 3.06ms, so
After turn off the corresponding backlight of current backlight subregion to present image frame end.To improve hangover in the way of black plug
While phenomenon, the backlight illumination of the backlight subarea ensure that.
It should be noted that when due to driving scanning, be not after lastrow pixel fully opens again under
One-row pixels driving scanning, but begin to scan next line pixel driver when lastrow pixel does not fully open also, because
This, it is in the above-described embodiments, last in the first row backlight subarea if being divided into 10 backlight subareas for whole image frame
One-row pixels are also when executing opening, and the first row pixel just has begun driving and scans in the second row backlight subarea, thing
In reality, the principle of this driving scanning has no effect on the implementation of the present invention program, this is because: black plug of the invention and being not concerned with
Driving scanning between adjacent rows pixel is overlapped with the presence or absence of temporal, is concerned only with the first row pixel in each backlight subarea and is opened
At the time of beginning to drive scanning, to trigger the backlight that corresponding time sequence control device closes the backlight subarea, and it is slotting closing
After black sweep time t, the backlight of backlight subarea is opened in time sequence control device control, when guaranteeing that the opening time is default
It is long.Then, backlight is closed after opening preset duration up to present image frame end, thus, in the feelings for being scanned black plug
Under condition, trailing phenomenon is both improved, in turn ensures that the backlight illumination of the backlight subarea was not dark.
In addition, considering that liquid crystal reaction speed is relatively slow and leads while being scanned black plug within liquid crystal drive sweep time
The image retention trailing phenomenon of cause, during being adjusted to from the grayscale value of former frame the grayscale value of present frame due to image, liquid
The brilliant corresponding brightness of grayscale value slower, and that next frame cannot be rapidly switched to of response speed, moreover, the response time of liquid crystal can
The black plug time can be greater than, therefore, can be compensated by zonal control liquid crystal response speed it is slow caused by luminance deviation ask
Topic.
Still based on above-mentioned scanning black plug scheme, it is contemplated that the backlight subarea under the control program of backlight subarea before
The backlight illumination of backlight subarea in backlight illumination and compensation scheme of the present invention, there is following relationship:
B=T*D/ (T-t) * Br+K ' * Br=D ' * B '=D ' * K*Br,
D '=[T*D/ (T-t)+K ']/K (3) can be obtained
Wherein, K ' is searched according to the penalty coefficient table that test is formed in advance, as shown in figure 3, direct when operation
Search the table.
If be still subject to above-mentioned scanning black plug when example, current frame image grayscale value is 8, and previous frame image gray-scale level value is
16, then finding K ' is -2%, T 8.3ms, and D 50%, t 0.9ms, K 2 then bring above-mentioned formula (2) into, and obtaining D ' is
34.7%.
So, backlight compensation scheme is considered while being scanned black plug, then can monitor the backlight subarea pair
When the first row pixel starts to carry out driving scanning in the picture portion answered, the backlight of the backlight subarea is closed into 0.9ms, so
Afterwards, it is then turned on T*D '=8.3*34.7%=2.88ms, finally, turning off backlight T-0.9-2.88=4.52ms, that is, is closed
To present image frame end.
In the above compensation scheme, since liquid crystal overturning is carried out according to forward and backward frame image gray-scale level value, that is to say, that
The different image gray-scale level value combination of forward and backward picture frame, overturning curve is also different, and it is different also to allow for deviation of luminance values ratio
Sample, if black plug time long enough, there is no need to compensate；In the case of typically now the black plug time be less than liquid crystal overturning when
Between, to need a penalty coefficient to compensate this luminance deviation.
By above-mentioned backlight control scheme, scanning is formed using the multi partition control system of backlight scanning for picture frame and is inserted
It is black, when corresponding multiple row pixels carry out driving scanning in each backlight subarea, the time of black plug is dispersed to driving as far as possible and is swept
The time retouched, and drive scanning to complete completely in multiple row pixels and then carry out the brightness adjustment of backlight subarea, specifically,
For any backlight subarea, in the backlight subarea, the first row pixel of corresponding picture portion starts driving scanning start time,
The backlight of the backlight subarea is closed to the scanning black plug time being calculated, then, the backlight of the backlight subarea is opened
Preset duration, so that the backlight illumination of current backlight subregion meets required brightness, finally, turning off the backlight of the backlight subarea
Lamp.To by the backlight control mode of backlight subarea, and combine the black plug mode of scanning black plug, effectively improve due to view
Feel the trailing phenomenon for persisting effect and generating, simultaneously as using scanning black plug, avoids existing complete black plug and cause
The excessively dark problem of backlight illumination.It is adjusted flexibly within the period for the backlight for opening preset duration moreover, the present invention passes through
Backlight illumination ensure that the backlight illumination of each backlight subarea and backlight illumination when not black plug are close to the greatest extent, meanwhile, also
It can guarantee that the backlight illumination of each backlight subarea is identical by the adjustment of the backlight illumination in the period, improve backlight point
The brightness homogeneity in area effectively improves the display quality of liquid crystal display device.In addition, it is contemplated that liquid crystal reaction speed it is relatively slow and
Caused image retention trailing phenomenon, the present invention additionally use zonal control compensate liquid crystal response speed it is slow caused by brightness
Deviation, thus, reduce the image retention between consecutive frame, reduces trailing phenomenon to the greatest extent.
Based on belonging to same inventive concept, the embodiment of the present invention with a kind of method for controlling backlight thereof provided in an embodiment of the present invention
Provide a kind of backlight control apparatus.
As shown in figure 4, being a kind of structural schematic diagram of backlight control apparatus provided in an embodiment of the present invention, need to illustrate
It is that the backlight control apparatus can be set in mobile phone, tablet computer, television set, display, laptop, Digital Frame, lead
It navigates in any products or components with crystal display such as instrument, which mainly includes with lower unit:
Monitoring unit 201 is scanned, for monitoring the first row pixel in the corresponding picture portion of current backlight subregion.
Timing control unit 202, for driving scanning since the first row pixel of current image frame Nth row picture portion
When, the backlight of the backlight subarea is closed into t duration, t is the scanning black plug time, which is greater than zero, and being less than should
The frame cycle duration of current image frame；And for by the backlight of the backlight subarea close t duration after, by backlight subarea
Backlight open preset duration, and make current backlight subarea backlight illumination meet needed for brightness；And will be described
After the backlight of backlight subarea opens preset duration, the backlight of the backlight subarea is set off.
As shown in figure 5, the backlight control apparatus further includes searching unit 203 and computing unit 204, due to searching unit
203 and computing unit 204 contribute to determine the scanning black plug time, therefore, when running the backlight control apparatus, two
Unit can operate simultaneously lookup calculate, still, timing control unit 202 can only select one in the two received be worth into
Row timing control.Specifically, the searching unit 203, for searching the row pixel scanning time in default scanning black plug timetable,
And the default scanning black plug time is calculated；Wherein, it presets in scanning black plug timetable and has recorded liquid crystal display device in difference
Drive the row pixel scanning time under scanning voltage.Computing unit 204 is inserted for the scanning to be calculated using following formula
The black time,Wherein, the N is the row number of pixels for including in current backlight subregion, described
γ is the coefficient of viscosity of liquid crystal material, and the d is liquid crystal cell spacing, and the Δ ε is the dielectric coefficient of liquid crystal material, and the v is
Drive scanning voltage, the vthFor predetermined threshold value voltage.
Preferably, as shown in fig. 6, on the basis of above-mentioned backlight control apparatus, backlight involved in the embodiment of the present invention
Control device can further include the first determination unit 205, for the backlight illumination according to needed for the backlight subarea and work as
Preceding backlight drive electric current brightness, determines the duty ratio of current backlight subregion；Second determination unit 206, for being determined according to first
The frame cycle duration of duty ratio and current image frame that unit 205 determines, determines the preset duration of current backlight subregion,
In, preset duration is the backlight opening time of current backlight subregion.
In embodiments of the present invention, on the one hand, the first determination unit 205 is used to determine duty ratio by following formula:
D '=T*D/ (T-t)/K (2)
Wherein, D ' is the duty ratio of current backlight subregion, and T is the frame cycle duration of current image frame, and D is not to be scanned
The duty ratio of backlight subarea when black plug operates, t are the driving of all row pixels in the corresponding picture portion of current backlight subregion
Sweep time, K are the backlight illumination coefficient of current backlight subregion.
On the other hand, the first determination unit is also used to determine the duty ratio by following formula:
D '=[T*D/ (T-t)+K ']/K (3)
Wherein, D ' is the duty ratio of current backlight subregion, and T is the frame cycle duration of current image frame, and D is not to be scanned
The duty ratio of backlight subarea when black plug operates, the t are all row pixels in the corresponding picture portion of current backlight subregion
Sweep time is driven, K ' is the grayscale value benefit corresponding with the grayscale value of previous image frame of the current image frame of the backlight subarea
Coefficient is repaid, K is the backlight illumination coefficient of current backlight subregion.
It should be understood by those skilled in the art that, the embodiment of the present invention can provide as method, system or computer program
Product.Therefore, complete hardware embodiment, complete software embodiment or reality combining software and hardware aspects can be used in the present invention
Apply the form of example.Moreover, it wherein includes the computer of computer usable program code that the present invention, which can be used in one or more,
The computer program implemented in usable storage medium (including but not limited to magnetic disk storage, CD-ROM, optical memory etc.) produces
The form of product.
The present invention be referring to according to the method for the embodiment of the present invention, the process of equipment (system) and computer program product
Figure and/or block diagram describe.It should be understood that every one stream in flowchart and/or the block diagram can be realized by computer program instructions
The combination of process and/or box in journey and/or box and flowchart and/or the block diagram.It can provide these computer programs
Instruct the processor of general purpose computer, special purpose computer, Embedded Processor or other programmable data processing devices to produce
A raw machine, so that being generated by the instruction that computer or the processor of other programmable data processing devices execute for real
The device for the function of being specified in present one or more flows of the flowchart and/or one or more blocks of the block diagram.
These computer program instructions, which may also be stored in, is able to guide computer or other programmable data processing devices with spy
Determine in the computer-readable memory that mode works, so that it includes referring to that instruction stored in the computer readable memory, which generates,
Enable the manufacture of device, the command device realize in one box of one or more flows of the flowchart and/or block diagram or
The function of being specified in multiple boxes.
These computer program instructions also can be loaded onto a computer or other programmable data processing device, so that counting
Series of operation steps are executed on calculation machine or other programmable devices to generate computer implemented processing, thus in computer or
The instruction executed on other programmable devices is provided for realizing in one or more flows of the flowchart and/or block diagram one
The step of function of being specified in a box or multiple boxes.
Although preferred embodiments of the present invention have been described, it is created once a person skilled in the art knows basic
Property concept, then additional changes and modifications may be made to these embodiments.So it includes excellent that the following claims are intended to be interpreted as
It selects embodiment and falls into all change and modification of the scope of the invention.
Obviously, various changes and modifications can be made to the invention without departing from essence of the invention by those skilled in the art
Mind and range.In this way, if these modifications and changes of the present invention belongs to the range of the claims in the present invention and its equivalent technologies
Within, then the present invention is also intended to include these modifications and variations.
Claims (9)
1. a kind of method for controlling backlight thereof, which is characterized in that suitable for liquid crystal display device, and the backlight of the liquid crystal display device
Mould group is controlled using backlight subarea, which comprises
Following black plug is executed according to driving scanning sequency for the corresponding backlight subarea of Nth row picture portion in current image frame
Operation:
When the first row pixel starts driving scanning in monitoring current image frame Nth row picture portion, by the backlight subarea
Backlight close t duration, wherein the t is the scanning black plug time, and the scanning black plug time, which can pass through, default scans black plug
Timetable search and is calculated or is calculated by specific formula；
After the backlight of the backlight subarea is closed t duration, the backlight of the backlight subarea is opened into preset duration,
And brightness needed for the backlight illumination of current backlight subregion is met；
After the backlight of the backlight subarea is opened preset duration, the backlight of the backlight subarea is set to off
It closes；
Wherein, scanning black plug time t search by default scanning black plug timetable and be calculated, comprising:
Row picture of the liquid crystal display device under different driving scanning voltage is had recorded in the default scanning black plug timetable
Plain opening time；Or
Wherein, the scanning black plug time t is calculated by specific formula, comprising:
The calculation formula is as follows:
Wherein, the N is the row number of pixels for including in current backlight subregion, and the γ is the coefficient of viscosity of liquid crystal material, institute
Stating d is liquid crystal cell spacing, and the Δ ε is the dielectric coefficient of liquid crystal material, and the v is driving scanning voltage, the vthIt is default
Threshold voltage.
2. the method as described in claim 1, which is characterized in that the preset duration determines in the following manner:
According to backlight illumination needed for the backlight subarea and current backlight driving current, the duty ratio of current backlight subregion is determined；
According to the frame cycle duration of the determining duty ratio and current image frame, determine current backlight subregion it is default when
It is long, wherein the preset duration is the backlight opening time of current backlight subregion.
3. method according to claim 2, which is characterized in that the duty ratio of the current backlight subregion is especially by following public affairs
Formula determines:
D '=T*D/ (T-t)/K (2)
Wherein, the D ' is the duty ratio of current backlight subregion, and the T is the frame cycle duration of current image frame, and the D is not
The duty ratio of backlight subarea when being scanned black plug operation, the t are current backlight subregion corresponding scanning black plug time, institute
State the backlight illumination coefficient that K is current backlight subregion.
4. method according to claim 2, which is characterized in that the duty ratio of the current backlight subregion is especially by following public affairs
Formula determines:
D '=[T*D/ (T-t)+K ']/K (3)
Wherein, the D ' is the duty ratio of current backlight subregion, and the T is the frame cycle duration of current image frame, and the D is not
The duty ratio of backlight subarea when being scanned black plug operation, the t are current backlight subregion corresponding scanning black plug time, institute
The grayscale value penalty coefficient corresponding with the grayscale value of previous image frame for the current image frame that K ' is the backlight subarea is stated, it is described
K is the backlight illumination coefficient of current backlight subregion.
5. a kind of backlight control apparatus, which is characterized in that suitable for liquid crystal display device, and the backlight of the liquid crystal display device
Mould group is controlled using backlight subarea, and described device includes:
Monitoring unit is scanned, for monitoring the first row pixel in the corresponding picture portion of current backlight subregion；
Timing control unit, when for driving scanning since the first row pixel of current image frame Nth row picture portion, by this
The backlight of backlight subarea closes t duration, wherein the t is the scanning black plug time, and the scanning black plug time can be by default
Scanning black plug timetable search and is calculated or is calculated by specific formula；And
For the backlight of the backlight subarea being opened default after the backlight of the backlight subarea is closed t duration
Duration, and the backlight illumination of current backlight subarea is made to meet required brightness；And
For setting the backlight of the backlight subarea to after the backlight of the backlight subarea is opened preset duration
It closes；
Wherein, the scanning black plug time by default scanning black plug timetable can search and be calculated, described device packet
It includes:
The default scanning black plug time is calculated for searching from default scanning black plug timetable in searching unit；
Wherein, the liquid crystal display device is had recorded under different driving scanning voltage in the default scanning black plug timetable
Row pixel opening time；Or
Wherein, the scanning black plug time t is calculated by specific formula, and described device includes:
Computing unit, for the scanning black plug time to be calculated using following formula,
Wherein, the N is the row number of pixels for including in current backlight subregion, and the γ is the viscous system of liquid crystal material
Number, the d are liquid crystal cell spacing, and the Δ ε is the dielectric coefficient of liquid crystal material, and the v is driving scanning voltage, the vthFor
Predetermined threshold value voltage.
6. device as claimed in claim 5, which is characterized in that described device further include:
First determination unit is used for the backlight illumination according to needed for the backlight subarea and current backlight driving current, determines current
The duty ratio of backlight subarea；
Second determination unit, for according to first determination unit determine duty ratio and current image frame the frame period when
It is long, determine the preset duration of current backlight subregion, wherein when the preset duration is that the backlight of current backlight subregion is opened
It is long.
7. device as claimed in claim 6, which is characterized in that second determination unit, specifically for passing through following formula
Determine the duty ratio:
D '=T*D/ (T-t)/K (2)
Wherein, the D ' is the duty ratio of current backlight subregion, and the T is the frame cycle duration of current image frame, and the D is not
The duty ratio of backlight subarea when being scanned black plug operation, the t are to own in the corresponding picture portion of current backlight subregion
The driving sweep time of row pixel, the K are the backlight illumination coefficient of current backlight subregion.
8. device as claimed in claim 6, which is characterized in that second determination unit, specifically for passing through following formula
Determine the duty ratio:
D '=[T*D/ (T-t)+K ']/K (3)
Wherein, the D ' is the duty ratio of current backlight subregion, and the T is the frame cycle duration of current image frame, and the D is not
The duty ratio of backlight subarea when being scanned black plug operation, the t1 are to own in the corresponding picture portion of current backlight subregion
The driving sweep time of row pixel, the K ' are the grayscale value of the current image frame of the backlight subarea and the ash of previous image frame
Rank is worth corresponding penalty coefficient, and the K is the backlight illumination coefficient of current backlight subregion.
9. a kind of liquid crystal display device, which is characterized in that including the described in any item backlight control apparatus of claim 5-8.
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| CN106782274A (en) * | 2017-01-17 | 2017-05-31 | 京东方科技集团股份有限公司 | A kind of display device and its driving method |
| CN108022563B (en) * | 2018-01-31 | 2020-08-28 | 武汉华星光电技术有限公司 | Low-delay liquid crystal display device based on partitioned backlight and driving method thereof |
| 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 |
| CN109256098B (en) * | 2018-11-22 | 2021-01-26 | 高创(苏州)电子有限公司 | Driving method, driving device and display device |
| CN110660365A (en) * | 2019-11-01 | 2020-01-07 | 深圳创维－Rgb电子有限公司 | Area backlight control method, display and storage medium |
| CN112863433B (en) | 2019-11-12 | 2022-06-24 | 上海和辉光电股份有限公司 | Display system, driving device and driving method of display device |
| CN112233623A (en) * | 2020-10-13 | 2021-01-15 | Tcl华星光电技术有限公司 | Display device and control method thereof |
| CN113299246A (en) * | 2021-05-12 | 2021-08-24 | 惠州视维新技术有限公司 | Backlight module brightness adjusting method, adjusting circuit and display device |
| US11699382B2 (en) * | 2021-07-21 | 2023-07-11 | Hefei Boe Joint Technology Co., Ltd. | Display device, method for driving a display device, and display driving circuit |
| CN113808548A (en) * | 2021-09-29 | 2021-12-17 | 武汉华星光电技术有限公司 | Display device and driving method thereof |
| CN114005416B (en) * | 2021-11-16 | 2022-08-30 | 北京显芯科技有限公司 | Backlight control method, apparatus and storage medium |
| CN114913821B (en) * | 2022-05-31 | 2024-03-22 | 合肥京东方显示技术有限公司 | Display module, control method thereof and display device |
| CN115831066B (en) * | 2022-12-13 | 2025-01-07 | 厦门天马微电子有限公司 | Display device and driving method thereof |
| CN116453472A (en) * | 2023-04-19 | 2023-07-18 | 京东方科技集团股份有限公司 | Backlight adjustment method, medium and electronic device |
| CN118737073B (en) * | 2024-08-06 | 2025-03-25 | 北京显芯科技有限公司 | Black insertion processing method, backlight panel and backlight system |
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