CN103050095A - Backlight driving method and backlight module as well as television - Google Patents
Backlight driving method and backlight module as well as television Download PDFInfo
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Abstract
The invention provides a backlight driving method and a backlight module as well as a television. On regional backlight controlled display equipment, a plurality of backlight source units are respectively corresponded to multiple areas of a display panel, and each regional backlight can be independently controlled. The gray level values of the first many frames of image signals of a displayed image in each area are stored in a buffer, then the gray levels of the first many frames of image signals and the gray level of the current frame of an image signal in the area are subjected to weighted mean processing, and a first gray level value of the display area is obtained. The first gray level value is provided with a plurality of image signals subjected to the weighted mean processing, thus the gray level value change of the image signal of the current frame has less effect on the first gray level value with the weighted mean. Since the first gray level value is used for controlling the backlight brightness of the area, the effect on the backlight brightness of the area is less, and the problem that the blinking sensibility of backlight caused by that the backlight brightness changes greatly along with the great change of the gray level value on the images of the front frame and the rear frame is prevented.
Description
Technical field
The present invention relates to the display technique field, particularly a kind of backlight driving method and backlight module, televisor.
Background technology
A kind of dynamic light adjustment technology of the at present existing employing of liquid crystal module, it changes according to the grey scale signal that shows image, cooperates to adjust module group backlight brightness, and realization reduces energy consumption.The dynamic light adjustment technology comprises regional dynamics light regulating technology and non-regional dynamics light regulating technology, and wherein, the regional dynamics light regulating technology is by module group backlight being divided into a plurality of zones, and each zone shows that gray scale of image independently adjusts this zone module group backlight brightness.
Wherein, the regional dynamics light regulating technology mainly by extracting the gray-scale value of image in the picture signal, is controlled the backlight illumination of corresponding backlight subarea by pwm signal.When the dark images of backlight subarea, the gray-scale value of picture signal is little, correspondingly reduces this subregion backlight illumination, when the image of backlight subarea is brighter, the gray-scale value of picture signal is large, correspondingly improves this subregion backlight illumination, reaches to strengthen contrast and the reduction power consumption purpose that image shows.Because the gray-scale value of picture signal is real-time change with the content that shows image, and the backlight illumination of each backlight subarea is to come corresponding adjustment according to the gray-scale value of sectional image signal, therefore, each backlight subarea backlight illumination respective change along with the content change that shows image.But when the brightness of the display image content of a certain backlight subarea occurs significantly by dark to bright or by bright during to dark the variation, backlight illumination can correspondingly be made by a relatively large margin adjustment, yet adjustment backlight brings obvious flickering by what backlight switch was controlled.
Be the problem of the flickering that solves above-mentioned backlight switch, mainly solve in the following ways in the prior art:
Adopted adjacent sectors is shown that the grey scale signal of image carries out data sampling, processed by the weighted mean to adjacent sectors grey scale signal data, obtained the gray-scale value of a weighting correction, then controlled the backlight illumination of this subregion according to the gray-scale value of weighting correction.Because by the subregion backlight illumination flicker problem of the gray-scale value of adjacent sectors demonstration image being made the weighting smoothing processing, solved to be brought greatly by rapid movement image and peripheral adjacent sectors brightness of image difference.
But in the process of inventor's technical scheme in realizing the embodiment of the present application, existent defect is as follows at least to find above-mentioned adjacent sectors to show the gray-scale value weighting antialiasing of image:
When a certain sectional image display brightness relatively stable, and larger variation when occuring in the average gray value of adjacent other subregions, like this, the average gray value of adjacent sectors has by a relatively large margin and changes, because this subregion backlight illumination is according to the weighted mean gray-scale value of adjacent sectors and definite, therefore, larger variation also can occur in this subregion backlight illumination, the area flicker sense that still can exist backlight switch to bring in this subregion.
Summary of the invention
The application provides a kind of backlight driving method and backlight module, televisor, solves to take adjacent sectors to show the flicker problem regional backlight of the gray-scale value weighting antialiasing of image in the prior art.
For realizing the above goal of the invention, the embodiment of the present application provides a kind of backlight driving method on the one hand, being applied to one includes in the display device of backlight, described backlight comprises N backlight unit, wherein, described backlight unit is independent control backlight illumination respectively, and wherein N is 2 or greater than 2 natural number, a described N backlight unit corresponds respectively to a display panel N viewing area of described display device; The gray-scale value that shows the front M frame image signal of image in each viewing area in N the viewing area is stored; The picture signal gray-scale value of the present frame in each viewing area in N the viewing area and the gray-scale value difference weighting of described front M frame image signal are processed, obtain the first gray-scale value of the demonstration image of each viewing area in N the viewing area, wherein, M is greater than 2 positive integers; Backlight illumination according to the backlight unit in the corresponding control display of described the first gray-scale value zone.
On the other hand, a kind of backlight module also is provided in the embodiment of the present application, comprise backlight and display board, described backlight comprises N backlight unit, wherein, described backlight unit is independent control backlight illumination respectively, and wherein N is 2 or greater than 2 natural number, described display panel, a described N backlight unit correspond respectively to N viewing area of described display panel; Storage unit is used for the gray-scale value that shows the front M frame image signal of image in each viewing area, N viewing area is stored; Computing unit, be connected with described storage unit, be used for the respectively weighting processing of gray-scale value with picture signal gray-scale value and the described front M frame image signal of the present frame in each viewing area, N viewing area, obtain the first gray-scale value of the demonstration image of each viewing area in N the viewing area, wherein, M is greater than 2 positive integers; Control module is connected with described computing unit, is used for receiving described first gray-scale value of described computing unit output, the backlight illumination of the backlight unit in corresponding control display zone.
On the one hand, also provide a kind of televisor in the present embodiment again, comprise the above-mentioned backlight module of claim.
Technical scheme by among the one or more embodiment in the embodiment of the present application can obtain following technique effect at least:
Compared with prior art, on regional backlight control display device, comprise a plurality of backlight units corresponding to a plurality of viewing areas of display panel, the zone is backlight can independently control for each, the gray-scale value of the front multiple image signal of the demonstration image in each zone is carried out storing in impact damper, then the gray-scale value of front multiple image signal and the gray-scale value of this zone current frame image signal are weighted average treatment, obtain the first gray-scale value of this viewing area, wherein, the first gray-scale value has the weighted mean of multiple image signal, therefore, the gray-value variation of current frame image signal is less for average weighted the first gray-scale value impact, control this regional backlight illumination by the first gray-scale value, also less to this zone backlight illumination variable effect, when the two field picture grey scale change was larger before and after avoiding in the prior art, backlight illumination also changed large thereupon, caused the problem of flickering backlight.
Description of drawings
The formation block diagram of the display device of Fig. 1 embodiment one;
The viewing area block diagram of Fig. 2 directly-down liquid crystal screen;
The viewing area block diagram of Fig. 3 side type LCDs;
The process flow diagram of a kind of backlight driving method of Fig. 4;
The block diagram of picture signal gray-scale value in 16 viewing areas of Fig. 5 directly-down liquid crystal screen;
The structural framing figure of a kind of backlight module of Fig. 6
Embodiment
Reach technological means and the effect that predetermined goal of the invention is taked for further setting forth the present invention, below in conjunction with accompanying drawing and preferred embodiment, embodiment, structure, feature and the effect thereof of a kind of backlight driving method that foundation the application is proposed and backlight module, televisor are described in detail as follows:
Aforementioned and other technology contents of relevant the application, Characteristic can be known to present in the following detailed description that cooperates with reference to graphic preferred embodiment.By the explanation of embodiment, when can being to reach technological means and the effect that predetermined purpose takes to be able to more deeply and concrete understanding to the present invention, yet listed accompanying drawing only provide with reference to the usefulness of explanation, the present invention is limited.
Technical scheme in the embodiment of the present application is for solving the problems of the technologies described above, and general thought is as follows:
On regional backlight control display device, owing to comprise a plurality of backlight units display panel is divided a plurality of zones, and each zone is backlight can independently control.The gray-scale value of the front multiple image signal of the demonstration image in each zone is carried out storing in impact damper, then the gray-scale value of front multiple image signal and the gray-scale value of this zone current frame image signal are weighted average treatment, obtain the first gray-scale value of this viewing area, wherein, the first gray-scale value has the weighted mean of multiple image signal, therefore, the gray-value variation of current frame image signal is less for average weighted the first gray-scale value impact, control this regional backlight illumination by the first gray-scale value, also less to this zone backlight illumination variable effect, when the two field picture grey scale change is larger before and after avoiding in the prior art, backlight illumination also changes large thereupon, causes the problem of flickering backlight.
In order to make the technical staff in the technical field of the invention more clearly understand the present invention, below in conjunction with accompanying drawing, by specific embodiment the technical scheme in the embodiment of the present application is described in detail.
Embodiment one:
A kind of backlight driving method is provided in the present embodiment, is applied in a kind of display device that includes backlight, described backlight comprises N backlight unit, and wherein, described backlight unit is independent control backlight illumination respectively, and wherein N is 2 or greater than 2 natural number.In practice, described display device can be LCD TV, or liquid crystal module, computer equipment etc.
Formation block diagram such as the display device 10 of Fig. 1 embodiment one.Fig. 2 shows that display device 10 comprises liquid crystal panel 11, liquid crystal panel drive circuit 12, backlight 13, backlight drive circuit 14.
Such as, the LCDs of 1080P includes 1080*1920 pixel and forms, and each pixel comprises R, G, three pixel cells of B, amounts to 1080*1920*3 pixel cell.Can according to the situation of backlight 13, corresponding to backlight unit liquid crystal panel 11 be divided into a plurality of viewing areas 20.
In conjunction with the viewing area block diagram of Fig. 2 directly-down liquid crystal screen, show that such as Fig. 2 LCDs is a kind of direct-type backlight LCDs again, backlight unit is corresponding to 16 viewing areas 20 of display panel 11, and each viewing area 20 comprises 4 LED lamps 21.Wherein, include 270*480 pixel in each viewing area 20.Certainly, viewing area 20 can be determined according to backlight unit, and is same, also can determine backlight unit according to the viewing area 20 of display panel 11, wherein, between the viewing area 20 of display panel 11 reflector plate is set, reflector plate is separated with viewing area 20.
Again in conjunction with Fig. 3 side type LCDs, the corresponding setting with backlight unit in 10 viewing areas 20 of display panel 11, each viewing area 20 comprises 4 LED lamps 21, wherein, it is certain to include 216*960 pixel in each viewing area 20, viewing area 20 can arrange to determine according to backlight unit, also can determine backlight unit according to the viewing area 20 of display panel 11, wherein, the viewing area 20 of display screen is determined by reflector plate is set between the light guide plate during side, reflector plate is cut apart a plurality of light guide plate subregions with light guide plate, and each light guide plate subregion is determined a viewing area 20.
Liquid crystal panel drive circuit 12, it comprises horizontal drive circuit and column drive circuit.Wherein, horizontal drive circuit is used for driving the liquid crystal molecule opening and closing of liquid crystal panel, and column drive circuit is used for providing the demonstration display pixel to show Refresh Data information.
Backlight drive circuit 14 is used for driving backlight 13.Backlight drive circuit 14 can each backlight unit 13a(b of drive), can and drive by FPGA and carry out the transmission of SPI signal between the chip, control the dutycycle of the backlight LED light of each backlight unit, also can directly send the SPI signal to driving chip by master chip, control the dutycycle of the backlight LED light of each backlight unit.Wherein, the SPI signal sends to the driving chip, drives the led circuit that duty that signal is converted to pwm signal control LED etc. with the SPI signal is recently realized each subregion.
Such as the process flow diagram of a kind of backlight driving method of Fig. 4, the specific implementation step is described in detail as follows:
Step S21: a described N backlight unit is divided into N viewing area 20a(b with display panel 20 correspondences of described display device 10).
Wherein, again in conjunction with Fig. 1, each viewing area 20 a(b) include a plurality of pixels in, the viewing area is determined according to backlight unit.The viewing area size can equate, can certainly be unequal.
In conjunction with Fig. 2 directly-down liquid crystal screen, backlight unit is distributed on the plane parallel with liquid crystal panel, can according to backlight unit quantity, arbitrarily liquid crystal panel be divided into different viewing area 20.
Again in conjunction with Fig. 3 side-light type liquid crystal display, backlight unit is distributed on the side of liquid crystal panel, backlight light is to inject from side, by light guide plate with distribution of light on liquid crystal panel, divide the backlight control area and be and be divided into areas at both sides with on liquid crystal panel eye LED lamp bar parallel, left side backlight unit irradiation viewing area, the left side, viewing area, the right backlight unit irradiation the right is restricted cutting apart the viewing area with LED lamp bar vertical direction.
Step S22: the gray-scale value that shows the front M frame image signal of image among each viewing area 20a (b) in N the viewing area is stored.
Specifically, extract the display image signals gray-scale value of each viewing area 20 a (b), viewing area 20 a (b) comprises a plurality of pixels, and each pixel comprises R, G, three pixel cells of B, when showing image, display need to be changed into R, G, electric signal that B is corresponding.Can from the rgb signal form of the correspondence of the pixel of each viewing area, extract the gray-scale value of pixel, extract Y-signal also can be from the pixel of each viewing area corresponding YUV signal form, then each pixel gray-scale value of this viewing area is added up and average, mean value is as the gray-scale value of the demonstration figure signal of this viewing area, certainly, also can calculate by other statisticals the gray-scale value of each pixel of this viewing area, obtain the gray-scale value of the display image signals of this viewing area, as: the statistics with histogram mode, moreover, also can be weighted the gray-scale value that mode obtains the demonstration image of this viewing area to the demonstration image slices vegetarian refreshments gray-scale value of this viewing area.
Such as picture signal gray-scale value block diagram in 16 viewing areas of Fig. 5 directly-down liquid crystal screen, display panel 10 is divided into 16 viewing area 20a(b), when a two field picture shows, show that in each viewing area the grey scale signal gray-scale value of image is respectively LM
1-LM
16, with the gray-scale value LM of corresponding viewing area demonstration image in the two field picture
1-LM
16Cushion, when showing the next frame image, correspondingly with the gray-scale value LM of next frame image
1-LM
16Also carry out buffer memory, successively front M frame is shown the gray-scale value LM of image
1-LM
16Correspondingly store.
M gets the positive integer greater than 2, can select appropriate value according to actual design, better selection 6.
Step S23: the picture signal gray-scale value of the present frame in each viewing area in N the viewing area and the gray-scale value difference weighted mean of described front M frame image signal are processed, obtained the first gray-scale value of the demonstration image of N viewing area.
Specifically, when showing that the M+1 frame shows image, from buffer, read the gray-scale value that the front M frame of having stored shows the display of image, gray-scale value and the front M frame of the signal of the demonstration image of M+1 two field picture are shown that the display gray-scale value of image is weighted average treatment, obtains the first gray-scale value of the demonstration image of respective regions.
Further, based on formula L
i'=((λ
1* L
1+ λ
2* L
2+ ... + λ
M* L
M)+λ
i* L
i)/(λ
1+ λ
2+ ... λ
M+ λ
i), obtain the first gray-scale value Li' of the image of i viewing area in N the viewing area, wherein, L
1To L
MBe expressed as respectively the front M frame image signal gray-scale value of described i viewing area, L
iThe current frame image signal gray-scale value that represents described i viewing area, λ
1To λ
MBe expressed as respectively the grey scale signal weighted value of the front M frame image signal of described i viewing area, λ
iBe expressed as the grey scale signal weighted value of the current frame image signal of described i viewing area, wherein, M is greater than 2 positive integers.
Better, the M value is 6.When the M value is excessive, will obtain mean value so that weighted mean is processed, variation tendency is very little, can not reach the purpose that dynamic backlight is adjusted function.Weighting coefficient λ
1To λ
MValue be 1, λ i also value be 1, certainly, also can be according to other positives of design needs value.
Show in conjunction with Fig. 5 again, take M as 6, get gray-scale value LM
1The zone be that example illustrates, the gray-scale value of grey scale signal is up to 256 GTGs, weighting coefficient λ
1To λ
MValue is 1, λ
iAlso value is 1, and front 6 frames show the gray-scale value LM of the display of image
1Be respectively: the first two field picture L
1The=0, second two field picture L
2The=255, the 3rd two field picture L
3The=255, the 4th two field picture L
4The=255, the 5th two field picture L
5The=0, the 6th two field picture L
6The=0, the 7th two field picture L
7The=249, the 8th two field picture L
8The=249, the 9th two field picture L
9The=249, the tenth two field picture L
10=10, when showing the 7th two field picture, L
1'=((L
1+ L
2+ ... + L
6)+L
7)/(6+1)=144.8, when showing the 8th two field picture, L
1'=((L
2+ L
3+ ... + L
7)+L
8)/(6+1)=180, when showing the 9th two field picture, L
1'=((L
3+ L
4+ ... + L
8)+L
9)/(6+1)=179, when showing the tenth two field picture, L
1'=((L
4+ L
5+ ... + L
9)+L
10)/(6+1)=144, that is to say that actual displayed the 7th to ten frame shows that the first gray-scale value of image is respectively: 144.8,180,179,144, it changes amplitude peak is that the 7th frame is when being transitioned into the 8th frame and showing image, the first gray-scale value is transitioned into 180 by 144.8, and difference is 35.2.Actual the 7th frame to the ten frames show that the gray-scale value of the display of image then is 249,249,249,10, during its maximum gradation value transition 249 to 10 of the 9th frame to the ten frame image signals, difference 239, amplitude of variation is that 239 GTGs are more much bigger than 35.2 GTGs, vary within wide limits easily produces variation flickering backlight.
Among Fig. 5, other regional LM
2To LM
16Calculate according to above-mentioned method successively and can obtain a kind of mild gray-scale value that changes.
Step S24: according to the backlight illumination of the backlight unit in the corresponding control display of described the first gray-scale value zone.
Specify, as can be known, when showing the i two field picture, correspondence obtains first a gray-scale value L in each viewing area among the step S23
i ', according to the first gray-scale value L
i 'Adjust the i frame and show in the image backlight illumination in this viewing area.Backlight source driving circuit 14 is according to corresponding the first gray-scale value L
i 'One backlight driving signal is provided, this driving signal can be the PWM(pulse width modulated signals), also can be other current signals, usually adopt PWM to drive signal and adjust the drive current that its dutycycle reaches LED lamp in the adjusting backlight unit, this drive current has determined the luminous flux of LED lamp, the relation that luminous flux is directly proportional with backlight illumination, the dutycycle of adjusting PWM driving signal can reach the purpose of adjusting backlight illumination.
Above-mentioned the first gray-scale value L
i' a backlight drive signal is provided, can be by presetting a form, wherein, corresponding L
i' corresponding with corresponding backlight drive signal, when obtaining one first gray-scale value L
i' the time, by tabling look-up, obtain corresponding backlight drive signal.
Present embodiment provides a kind of backlight driving method, the gray-scale value of the front multiple image signal of the demonstration image in each zone is carried out storing in impact damper, then the gray-scale value of front multiple image signal and the gray-scale value of this zone current frame image signal are weighted average treatment, obtain the first gray-scale value of this viewing area, wherein, the first gray-scale value has the weighted mean of multiple image signal, therefore, the gray-value variation of current frame image signal is less for average weighted the first gray-scale value impact, control this regional backlight illumination by the first gray-scale value, also less to this zone backlight illumination variable effect, when the two field picture grey scale change is larger before and after avoiding in the prior art, backlight illumination also changes large thereupon, causes the problem of flickering backlight.
Embodiment two:
Present embodiment two provides a kind of backlight module, comprises backlight and display board, and described backlight comprises N backlight unit, and wherein, described backlight unit is independent control backlight illumination respectively, and wherein N is 2 or greater than 2 natural number.
Show in conjunction with Fig. 1 that again backlight module is identical with display device 10 structures, at this repeated description no longer.
Such as the structural framing figure of a kind of backlight module of Fig. 6, above-mentioned backlight module also comprises storage unit 102, computing unit 103, control module 104.
Described display panel 11 is connected with described backlight 13, and described backlight 13 is for it provides light, and a described N backlight unit corresponds respectively to N viewing area.
Further, each viewing area of described display panel specifically includes a plurality of pixels.
Further, the grey scale signal data of a plurality of pixels specifically also comprise red pixel, green pixel and blue pixel data in the described viewing area 11.
Further, described computing unit 103, concrete being used for processed the grey scale signal data of each a plurality of pixel in viewing area, obtains the gray-scale value of the demonstration image in this zone.
Further, based on formula L
i'=((λ
1* L
1+ λ
2* L
2+ ... + λ
M* L
M)+λ
i* L
i)/(λ
1+ λ
2+ ... λ
M+ λ
i), obtain the first gray-scale value L of the image of i viewing area in N the viewing area
i', wherein, L
1To L
MBe expressed as respectively the front M frame image signal gray-scale value of described i viewing area, L
iThe current frame image signal gray-scale value that represents described i viewing area, λ
1To λ
MBe expressed as respectively the grey scale signal weighted value of the front M frame image signal of described i viewing area, λ
iBe expressed as the grey scale signal weighted value of the current frame image signal of described i viewing area, wherein, M is greater than 2 positive integers.
Further, described control module 104 is used for exporting N dim signal according to N the first gray-scale value of the demonstration image of N viewing area, and each dim signal is controlled the backlight illumination of the backlight unit of corresponding viewing area in N dim signal.
Present embodiment provides a kind of backlight module, the gray-scale value of the front multiple image signal of the demonstration image in each zone is carried out storing in impact damper, then the gray-scale value of front multiple image signal and the gray-scale value of this zone current frame image signal are weighted average treatment, obtain the first gray-scale value of this viewing area, wherein, the first gray-scale value has the weighted mean of multiple image signal, therefore, the gray-value variation of current frame image signal is less for average weighted the first gray-scale value impact, control this regional backlight illumination by the first gray-scale value, also less to this zone backlight illumination variable effect, when the two field picture grey scale change is larger before and after avoiding in the prior art, backlight illumination also changes large thereupon, causes the problem of flickering backlight.
Embodiment three:
Present embodiment provides a kind of televisor, and it comprises the backlight module described in the embodiment two.Described televisor also comprises power-supplying circuit, signal processing circuit, signal receiving circuit and shell.
Wherein, the backlight module that comprises is identical with embodiment two, at this repeated description no longer.
Although described the preferred embodiments of the present invention, in a single day those skilled in the art get the basic creative concept of cicada, then can make other change and modification to these embodiment.So claims are intended to all changes and the modification that are interpreted as comprising preferred embodiment and fall into the scope of the invention.
Obviously, those skilled in the art can carry out various changes and modification to the present invention and not break away from the spirit and scope of the present invention.Like this, if of the present invention these are revised and modification belongs within the scope of claim of the present invention and equivalent technologies thereof, then the present invention also is intended to comprise these changes and modification interior.
Claims (11)
1. a backlight driving method is applied to one and includes in the display device of backlight, and described backlight comprises N backlight unit, and wherein, described backlight unit is independent control backlight illumination respectively, and wherein N is 2 or greater than 2 natural number, it is characterized in that,
A described N backlight unit corresponds respectively to N viewing area of the display panel of described display device;
The gray-scale value that shows the front M frame image signal of image in each viewing area in N the viewing area is stored, and wherein, M is greater than 2 positive integers;
The picture signal gray-scale value of the present frame in each viewing area in N the viewing area and the gray-scale value difference weighted mean of described front M frame image signal are processed, obtained the first gray-scale value of each viewing area demonstration image in N the viewing area;
Control the backlight illumination of the backlight unit of its viewing area according to described the first gray-scale value.
2. according to claim 1 described method is characterized in that the picture signal gray-scale value of described each viewing area comprises:
Include a plurality of pixels in each viewing area;
The picture signal grey scale signal data of a plurality of pixels are processed in each viewing area, obtain the gray-scale value of the demonstration image in this zone.
3. method according to claim 2 is characterized in that, the grey scale signal data of the picture signal of described pixel comprise:
Red pixel, green pixel and blue pixel data in each pixel.
4. according to claim 1 described method, it is characterized in that, described step is with the respectively weighted mean processing of gray-scale value of picture signal gray-scale value and the described front M frame image signal of the present frame in each viewing area in N the viewing area, obtain the first gray-scale value of the demonstration image of each viewing area in N the viewing area, specifically comprise:
Based on formula L
i'=((λ
1* L
1+ λ
2* L
2+ ... + λ
M* L
M)+λ
i* L
i)/(λ
1+ λ
2+ ... λ
M+ λ
i), obtain the first gray-scale value L of the image of i viewing area in N the viewing area
i', wherein, L
1To L
MBe expressed as respectively the front M frame image signal gray-scale value of described i viewing area, L
iThe current frame image signal gray-scale value that represents described i viewing area, λ
1To λ
MBe expressed as respectively the grey scale signal weighted value of the front M frame image signal of described i viewing area, λ
iBe expressed as the grey scale signal weighted value of the current frame image signal of described i viewing area, wherein, M is greater than 2 positive integers.
5. according to claim 1 described method is characterized in that, described step specifically comprises according to the backlight illumination of the backlight unit in the corresponding control display of described the first gray-scale value zone:
N dim signal of N the first gray-scale value output according to the demonstration image of N viewing area;
Each dim signal is controlled the backlight illumination of the backlight unit of corresponding viewing area in N dim signal.
6. a backlight module comprises backlight and display board, and described backlight comprises N backlight unit, and wherein, described backlight unit is independent control backlight illumination respectively, and wherein N is 2 or greater than 2 natural number, it is characterized in that:
Described display panel is connected with described backlight, and described backlight provides light for display panel, and a described N backlight unit corresponds respectively to N viewing area;
Storage unit is used for the gray-scale value that shows the front M frame image signal of image in each viewing area, N viewing area is stored, and wherein, M is greater than 2 positive integers;
Computing unit, be connected with described storage unit, be used for the respectively weighted mean processing of gray-scale value with picture signal gray-scale value and the described front M frame image signal of the present frame in each viewing area, N viewing area, the first gray-scale value of each viewing area in the demonstration image of N viewing area of acquisition;
Control module is connected with described computing unit, is used for receiving described first gray-scale value of described computing unit output, the backlight illumination of the backlight unit in corresponding control display zone.
7. described backlight module according to claim 6 is characterized in that each viewing area of described display panel specifically includes a plurality of pixels;
Described computing unit, concrete being used for processed the grey scale signal data of each a plurality of pixel in viewing area, obtains the gray-scale value of the demonstration image in this zone.
8. described backlight module according to claim 7 is characterized in that the grey scale signal data of a plurality of pixels specifically also comprise red pixel, green pixel and blue pixel data in the described viewing area.
9. described backlight module according to claim 6 is characterized in that described computing unit specifically comprises:
Based on formula L
i'=((λ
1* L
1+ λ
2* L
2+ ... + λ
M* L
M)+λ
i* L
i)/(λ
1+ λ
2+ ... λ
M+ λ
i), obtain the first gray-scale value L of the image of i viewing area in N the viewing area
i', wherein, L
1To L
MBe expressed as respectively the front M frame image signal gray-scale value of described i viewing area, L
iThe current frame image signal gray-scale value that represents described i viewing area, λ
1To λ
MBe expressed as respectively the grey scale signal weighted value of the front M frame image signal of described i viewing area, λ
iBe expressed as the grey scale signal weighted value of the current frame image signal of described i viewing area, wherein, M is greater than 2 positive integers.
10. described backlight module according to claim 9 is characterized in that, also comprises:
Described control module is used for exporting N dim signal according to N the first gray-scale value of the demonstration image of N viewing area, and each dim signal is controlled the backlight illumination of the backlight unit of corresponding viewing area in N dim signal.
11. a televisor is characterized in that, comprises arbitrary described backlight module among the claim 6-10.
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| CN2013100026257A CN103050095A (en) | 2013-01-06 | 2013-01-06 | Backlight driving method and backlight module as well as television |
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| CN105047142A (en) * | 2015-09-01 | 2015-11-11 | 青岛海信电器股份有限公司 | Liquid crystal display brightness control method and device and liquid crystal display equipment |
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| CN105047142B (en) * | 2015-09-01 | 2017-11-24 | 青岛海信电器股份有限公司 | Liquid crystal display brightness control method and device and liquid crystal display |
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| US11386856B2 (en) | 2019-08-06 | 2022-07-12 | Shenzhen Skyworth-Rgb Electronic Co., Ltd. | Method and device for adjusting mini led backlight television picture |
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