CN105632421B - Back light source brightness control method, Apparatus and liquid crystal display equipment - Google Patents
Back light source brightness control method, Apparatus and liquid crystal display equipment Download PDFInfo
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- 238000000034 method Methods 0.000 title claims abstract description 36
- 239000004973 liquid crystal related substance Substances 0.000 title claims abstract description 27
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- G—PHYSICS
- G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
- G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
- G09G3/00—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes
- G09G3/20—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters
- G09G3/34—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters by control of light from an independent source
- G09G3/3406—Control of illumination source
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Abstract
A kind of back light source brightness control method of present invention offer, Apparatus and liquid crystal display equipment, this method include：Respectively according to the luma data of sectional image, the basic backlight data of backlight and extension backlight data in the corresponding backlight subarea of the sectional image are determined；Wherein, the basic backlight data is used to indicate the duty ratio of the pulse width modulation (PWM) of backlight in the backlight subarea, and the extension backlight data is used to indicate the peak point current gain coefficient of backlight in the backlight subarea；Further, the duty ratio of the PWM of backlight in the backlight subarea is adjusted according to the basic backlight data, and adjusts the peak point current of backlight in the backlight subarea according to the extension backlight data, to control back light source brightness in the backlight subarea.As it can be seen that improving the dynamic range of back light source brightness adjustment, better image region contrast and display dynamic range are realized.
Description
Technical field
The present invention relates to a kind of technical field of liquid crystal display more particularly to back light source brightness control method, device and liquid crystal
Show equipment.
Background technology
In existing liquid crystal display, generally use multi partition dynamic backlight modulation technique controls back light source brightness, with
Promotion displays contrast equal image qualities effect.
Fig. 1 is backlight subarea schematic diagram in multi partition dynamic backlight modulation technique, as shown in Figure 1, entire backlight source matrix
Including the M subregion in the directions A and N number of subregion in the directions B, such as figure assume M=16, N=9, M*N=144 backlight subarea is counted, often
Control can be operated alone in back light source brightness in a backlight subarea.Accordingly, multiple and backlight point is divided into per frame global image
The corresponding sectional image in area, by acquiring the luma data of sectional image to obtain carrying on the back in the corresponding backlight subarea of the sectional image
The backlight data of light source, and then adjusted according to the backlight data for driving the pulse width of backlight in the backlight subarea to modulate
The duty ratio of (Pulse Width Modulation, abbreviation PWM) is to control back light source brightness in the backlight subarea.
But existing multi partition dynamic backlight modulation technique is under the premise of setting the constant peak electric current of backlight
What the mode of the duty ratio of dynamic adjustment PWM was realized, since the duty ratio of PWM can only adjust in 0~100% range, that is, carry on the back
The variation range of light-source brightness also can only be 0~100% of corresponding brightness under current constant peak electric current, it is seen then that backlight is bright
The dynamic range of degree adjustment is limited.
Invention content
A kind of back light source brightness control method of present invention offer, Apparatus and liquid crystal display equipment, improve back light source brightness
The dynamic range of adjustment realizes better image region contrast and display dynamic range.
In a first aspect, the embodiment of the present invention provides a kind of back light source brightness control method, including：
Respectively according to the luma data of sectional image, the base of backlight in the corresponding backlight subarea of the sectional image is determined
This backlight data and extension backlight data；Wherein, the luma data of the sectional image includes：At least one in the sectional image
The luma data of partial pixel point；The basic backlight data is used to indicate the pulse width tune of backlight in the backlight subarea
The duty ratio of PWM processed, the extension backlight data are used to indicate the peak point current gain coefficient of backlight in the backlight subarea；
The duty ratio of the PWM of backlight in the backlight subarea is adjusted according to the basic backlight data, and according to institute
The peak point current that extension backlight data adjusts backlight in the backlight subarea is stated, it is bright to control backlight in the backlight subarea
Degree.
Second aspect, the embodiment of the present invention provide a kind of backlight luminance control apparatus, including：
Determining module, for according to the luma data of sectional image, determining the corresponding backlight point of the sectional image respectively
The basic backlight data of backlight and extension backlight data in area；Wherein, the luma data of the sectional image includes：Described point
The luma data of at least part pixel in area's image；The basic backlight data is used to indicate backlight in the backlight subarea
The duty ratio of the pulse width modulation (PWM) in source, the extension backlight data are used to indicate the peak of backlight in the backlight subarea
It is worth current gain coefficient；
Adjust module, the duty for adjusting the PWM of backlight in the backlight subarea according to the basic backlight data
Than, and according to the peak point current for extending backlight data and adjusting backlight in the backlight subarea, to control the backlight
Back light source brightness in subregion.
The third aspect, the embodiment of the present invention provide a kind of liquid crystal display, including：
Backlight processing unit and pulse width modulation (PWM) driver；
Wherein, the backlight processing unit, for respectively according to the luma data of sectional image, determining the sectional image
The basic backlight data of backlight and extension backlight data in corresponding backlight subarea；Wherein, the gray number of the sectional image
According to including：The luma data of at least part pixel in the sectional image；The basic backlight data is used to indicate described
The duty ratio of the PWM of backlight in backlight subarea, the extension backlight data are used to indicate backlight in the backlight subarea
Peak point current gain coefficient；
The backlight processing unit is additionally operable to adjust backlight in the backlight subarea according to the basic backlight data
The duty ratio of PWM, and according to the peak point current for extending backlight data and adjusting backlight in the backlight subarea；
The pwm driver, the duty ratio for the PWM after being adjusted according to the backlight processing unit generate the first PWM
Signal is controlled to control back light source brightness in the backlight subarea；
The pwm driver is additionally operable to the peak point current after being adjusted according to the backlight processing unit and generates the 2nd PWM controls
Signal processed is to control back light source brightness in the backlight subarea.
In the present invention, by respectively according to the luma data of sectional image, with the corresponding backlight of the determination sectional image
The basic backlight data of backlight and extension backlight data in subregion；Further, institute is adjusted according to the basic backlight data
The duty ratio of the pulse width modulation (PWM) of backlight in backlight subarea is stated, and according to described in extension backlight data adjustment
The peak point current of backlight in backlight subarea, to control back light source brightness in the backlight subarea；As it can be seen that the embodiment of the present invention exists
On the basis of the duty ratio for adjusting PWM, the peak point current of backlight in adjustable backlight subregion is gone back, i.e. peak point current can be carried
It rises, to which the dynamic range of back light source brightness adjustment is promoted, and then better image region contrast may be implemented
And display dynamic range, to promote image quality effect.
Description of the drawings
In order to more clearly explain the embodiment of the invention or the technical proposal in the existing technology, to embodiment or will show below
There is attached drawing needed in technology description to be briefly described, it should be apparent that, the accompanying drawings in the following description is this hair
Some bright embodiments for those of ordinary skill in the art without having to pay creative labor, can be with
Obtain other attached drawings according to these attached drawings.
Fig. 1 is backlight subarea schematic diagram in multi partition dynamic backlight modulation technique；
Fig. 2 is the flow diagram of back light source brightness control method embodiment one of the present invention；
Relation schematic diagrams of Fig. 3 A between luma data and backlight data；
Fig. 3 B are the corresponding bit schematic diagram of backlight data one；
Fig. 3 C are the corresponding bit schematic diagram of backlight data two；
Fig. 3 D are the corresponding bit schematic diagram of backlight data three；
Fig. 4 is the division schematic diagram of backlight subarea region/image partitioned area；
Fig. 5 A are the backlight drive circuit functional block diagram of the method for the present invention embodiment；
Duty ratio/current diagram that Fig. 5 B are adjusted for back light source brightness control method of the present invention；
Fig. 6 is the structural schematic diagram of backlight luminance control apparatus embodiment one of the present invention；
Fig. 7 is the structural schematic diagram of liquid crystal display embodiment of the present invention.
Specific implementation mode
In order to make the object, technical scheme and advantages of the embodiment of the invention clearer, below in conjunction with the embodiment of the present invention
In attached drawing, technical scheme in the embodiment of the invention is clearly and completely described, it is clear that described embodiment is
A part of the embodiment of the present invention, instead of all the embodiments.Based on the embodiments of the present invention, those of ordinary skill in the art
The every other embodiment obtained without creative efforts, shall fall within the protection scope of the present invention.
In order to promote the dynamic contrast image quality effect of liquid crystal display, multi partition dynamic backlight modulation skill is usually taken
Art, entire backlight source matrix, which is expert on direction and column direction, is divided into multiple backlight subareas, includes in each backlight subarea
Backlight can be operated alone control its brightness, wherein it should be noted that, the backlight subarea ideally, each backlight subarea
Its backlight area can be independently illuminated, but in fact, adjacent back light source brightness has certain influence.
In existing multi partition dynamic backlight modulation technique, shown on liquid crystal display panel corresponding with backlight subarea by acquiring
The luma data for the sectional image shown is to obtain the backlight data of backlight in the corresponding backlight subarea of the sectional image, Jin Ergen
Backlight in the backlight subarea is controlled according to the backlight data to shine.It should be noted that the sectional image refers to：It takes and backlight
The same division rule of subregion is by liquid crystal display panel subregion in proportion, the liquid crystal display subregion face with the backlight subarea same position
Global image (is divided into multiple block plans corresponding with backlight subarea by the image polymerization of shown all pixels point on plate
Picture)；Wherein, due to design error and fabrication error, or consider that design such as needs at factors, the backlight subarea and the sectional image pair
The zone boundary that should be shown on liquid crystal display panel can not exclusively overlap, further explanation, different backlight subareas it
Between boundary line and different liquid crystal display subregion panel between boundary line be a kind of virtual boundary line, there is no physics in actual design
Boundary.
But existing multi partition dynamic backlight modulation technique is under the premise of setting the constant peak electric current of backlight
What the mode of the duty ratio of dynamic adjustment PWM was realized, it is seen then that the dynamic range of back light source brightness adjustment is limited.
Below in conjunction with the accompanying drawings by specific embodiment to back light source brightness control method provided in an embodiment of the present invention, device
And liquid crystal display is described in detail.
Fig. 2 is the flow diagram of back light source brightness control method embodiment one of the present invention.The executive agent of the present embodiment
Can be that backlight of the configuration in liquid crystal display (such as LCD TV, liquid crystal display or tablet computer etc.) is bright
Control device is spent, which can be by software and or hardware realization, the dynamic change model for improving brightness of backlight source adjustment
It encloses, and then better image region contrast and display dynamic range may be implemented, to promote image quality effect.As shown in Fig. 2, this
The method of embodiment may include：
S201, respectively according to the luma data of sectional image, determine backlight in the corresponding backlight subarea of the sectional image
Basic backlight data and extension backlight data.
Wherein, the luma data of sectional image includes：The luma data of at least part pixel in the sectional image；It should
Basic backlight data is used to indicate the duty ratio of the pulse width modulation (PWM) of backlight in the backlight subarea, the extension backlight number
According to the peak point current gain coefficient for being used to indicate backlight in the backlight subarea.
In the embodiment of the present invention, global image is divided into multiple sectional images corresponding with backlight subarea, such as Fig. 1 institutes
Show, the backlight source matrix of liquid crystal display is divided into 16 subregions according to horizontal direction and column direction is divided into 9 subregions, will
Integral back light source matrix is divided into 144 backlight subareas, and optionally, backlight can be LED backlight；Accordingly, according to backlight
The division rule of subregion should mutually have 16*9 virtual partition (including 144 sectional images) on liquid crystal display panel, wherein
Each sectional image includes multiple pixels.
Optionally, before step S201, the grayscale of at least part pixel included in each sectional image is counted
Data, being respectively formed the luma data of corresponding sectional image, (luma data of i.e. each sectional image includes in the sectional image
The luma data of at least part pixel).It optionally, can be according to the partial pixel point of sectional image in order to reduce calculation amount
Luma data, determine the luma data of the sectional image；It certainly, also can be according to the grayscale of all pixels point of the sectional image
Data determine the luma data of the sectional image, are not restricted to this in the embodiment of the present invention.
In step s 201, backlight in the corresponding backlight subarea of the sectional image is determined according to the luma data of sectional image
The basic backlight data in source, and determined in the corresponding backlight subarea of the sectional image and carried on the back according to the luma data of the sectional image
The extension backlight data of light source.Wherein, predetermined backlight value extraction algorithm can be used according to the luma data of sectional image, determining should
The basic backlight data of backlight (is additionally operable to indicate the base of backlight in the backlight subarea in the corresponding backlight subarea of sectional image
This luminance information), optionally, which can be that (including should by the luma data of the sectional image
The luma data of at least part pixel in sectional image) be averaged algorithm, or extract the sectional image in
In at least part pixel in redgreenblue sub-pixel grayscale maximum value mean algorithm, or can also be average value and
Weighted mean (weighting coefficient is preset) algorithm of maximum value etc., certainly, can also lead in the present embodiment and other embodiments
It crosses other algorithms and obtains the basic backlight data of backlight in the corresponding backlight subarea of sectional image, this is not limited.
Optionally, by according to the luma data and preset mapping relations of the sectional image (for example, with reference to gray number
According to the corresponding extension backlight data of the relationship between corresponding peak point current gain coefficient, peak point current gain coefficient
Between the corresponding extension backlight data of relationship or grayscale difference between relationship etc.) determine that the sectional image corresponds to
Backlight subarea in backlight extension backlight data, wherein the extension backlight data is used to indicate in the backlight subarea
The peak point current gain coefficient of backlight；As it can be seen that in the embodiment of the present invention, extension is increased on the basis of basic backlight data
Backlight data.
Optionally, at least one bit can be extended on the basis of existing backlight adjusts resolution ratio in the embodiment of the present invention
(bit) position is for carrying the extension backlight data, for example, defining the extension bits of 2 bits (bit) for carrying the extension back of the body
Light data, relation schematic diagrams of Fig. 3 A between luma data and backlight data, Fig. 3 B are the corresponding bit signal of backlight data
Figure one, Fig. 3 C are the corresponding bit schematic diagram two of backlight data, and Fig. 3 D are the corresponding bit schematic diagram three of backlight data, are such as schemed
Shown in 3A- Fig. 3 D, in the embodiment of the present invention, on the basis of existing backlight adjusts resolution ratio, 2bit (i.e. extension bits) is extended
For carrying extension backlight data, (in such as Fig. 3 B under 8bit backlights adjustment resolution model, bit-8 and bit-9 are used to indicate expansion
Open up backlight data；Under 10bit backlights adjustment resolution model in Fig. 3 C, bit-10 and bit-11 are used to indicate extension backlight number
According to；Under 12bit backlights adjustment resolution model in Fig. 3 D, bit-12 and bit-13 are used to indicate extension backlight data)；Its
In, different extension backlight datas is used to indicate different peak point current gain coefficients, and (table 1 is extension backlight number as shown in table 1
According to the relation table between peak point current gain coefficient).
Relation table between table 1, extension backlight data and peak point current gain coefficient
| Extend backlight data | Peak point current gain coefficient |
| 00 | 0.5 |
| 01 | 1.0 |
| 10 | 1.5 |
| 11 | 2.0 |
Similarly, the basic backlight data of backlight and extension backlight number in other backlight subareas are obtained by the same way
According to details are not described herein again.
S202, the duty that the pulse width modulation (PWM) of backlight in the backlight subarea is adjusted according to the basic backlight data
Than, and the peak point current of backlight in the backlight subarea is adjusted according to the extension backlight data, to control in the backlight subarea
Back light source brightness.
In the embodiment of the present invention, in determining backlight subarea the basic backlight data of backlight and extension backlight data after,
The duty ratio of the PWM of backlight in the backlight subarea is adjusted according to the basic backlight data, at the same time, according to the extension backlight
The peak point current of backlight in the data point reuse backlight subarea, to reach the mesh for controlling back light source brightness in the backlight subarea
's.Wherein, the mode of the duty ratio of the PWM of backlight in the backlight subarea is adjusted according to the basic backlight data, it can be with existing skill
The mode for adjusting the duty ratio of PWM in art according to backlight data is similar, and details are not described herein again.Optionally, according to the extension backlight
Data can determine the peak point current gain coefficient of backlight in the backlight subarea (for example, being based on shown in above-mentioned table 1, the extension back of the body
Light data is " 10 ", then corresponding peak point current gain coefficient is 1.5, that is, adjusts the peak of backlight in the backlight subarea after electric current
Value electric current is 1.5 times adjusted before electric current), and the back of the body is adjusted according to the peak point current gain coefficient of backlight in the backlight subarea
The peak point current of backlight in light subregion.As it can be seen that the embodiment of the present invention is on the basis of adjusting the duty ratio of PWM, it is also adjustable
The peak point current of backlight in backlight subarea, i.e. peak point current can be promoted, to the dynamic change of back light source brightness adjustment
Range is promoted.
In the embodiment of the present invention, by according to the luma data of sectional image, being corresponded to respectively with the determination sectional image
Backlight subarea in backlight basic backlight data and extension backlight data；Further, according to the basic backlight data
The duty ratio of the pulse width modulation (PWM) of backlight in the backlight subarea is adjusted, and according to the extension backlight data tune
The peak point current of backlight in the whole backlight subarea, to control back light source brightness in the backlight subarea；As it can be seen that the present invention is real
Example is applied on the basis of adjusting the duty ratio of PWM, goes back the peak point current of backlight in adjustable backlight subregion, i.e. peak point current can
It is promoted, to which the dynamic range of back light source brightness adjustment is promoted, and then better image region may be implemented
Contrast and display dynamic range, to promote image quality effect.
Optionally, on the basis of the above embodiment 1, according to the luma data of sectional image, the sectional image pair is determined
The extension backlight data of backlight in the backlight subarea answered, including：
The reference luma data of the sectional image is determined according to the luma data of the sectional image；Wherein, this refers to grayscale
Data are used to indicate the grey level of the sectional image；
Luma data and the first preset mapping relations are referred to according to this, determine that this refers to the corresponding first peak of luma data
It is worth current gain coefficient；Wherein, which includes：Difference is with reference to the corresponding peak point current of luma data
Relationship between gain coefficient；
According to the first peak value current gain coefficient and the second preset mapping relations, the first peak value current gain is determined
The corresponding extension backlight data of coefficient；Wherein, which includes：Different peak point current gain coefficients are right with it
Relationship between the extension backlight data answered.
In the embodiment of the present invention, according to the luma data of the sectional image (including at least part picture in the sectional image
The luma data of vegetarian refreshments) the reference luma data of the sectional image is determined by predetermined grey order algorithm；Wherein, this refers to gray number
According to the grey level for being used to indicate the sectional image；Optionally, which can be maximum value-based algorithm, accordingly,
The reference luma data of the obtained sectional image is the maximum of the luma data of at least part pixel in the sectional image
Luma data；Optionally, which can also be mean algorithm, accordingly, the reference of the obtained sectional image
Luma data is the mean value luma data of the luma data of at least part pixel in the sectional image；Certainly, the predetermined ash
Order algorithm can also be other manner (such as weighted mean approach and average value weighting method etc.), and the embodiment of the present invention does not make this
Limitation.Optionally, the reference gray number of the sectional image can be determined according to the luma data of all pixels point of the sectional image
According to not being restricted to this in the embodiment of the present invention.
The first preset mapping relations are previously stored in backlight luminance control apparatus in the embodiment of the present invention, wherein
The first preset mapping relations include：Difference is with reference to the relationship between the corresponding peak point current gain coefficient of luma data；
Optionally, each different that different peak point current gain systems can be corresponded to reference to luma data in the first preset mapping relations
Number, or the reference luma data in a certain range corresponds to identical peak point current gain coefficient, for example, with reference to ash
Exponent number is according to 155-175 ranges are belonged to, then corresponding peak point current gain coefficient is A.Optionally, which can
It is stored in table form in the backlight luminance control apparatus, it is of course also possible to other forms store, the embodiment of the present invention
This is not restricted.Further, according to the reference luma data of the sectional image and the first preset mapping relations, really
Fixed this refers to the corresponding first peak value current gain coefficient of luma data.
The second preset mapping relations are previously stored in backlight luminance control apparatus in the embodiment of the present invention, wherein
The second preset mapping relations include：Relationship between the corresponding extension backlight data of different peak point current gain coefficients；
Different extension backlight datas corresponds to different peak point current gain coefficients.Optionally, which can be with table
The form (for example, shown in above-mentioned table 1) of lattice is stored in the backlight luminance control apparatus, it is of course also possible to which other forms are deposited
Storage, the embodiment of the present invention are not restricted this.
Further, according to the first peak value current gain coefficient and the second preset mapping relations, determine this first
The corresponding extension backlight data of peak point current gain coefficient, to adjust backlight in the backlight subarea according to the extension backlight data
The peak point current in source.
Optionally, on the basis of the above embodiment 1, which is determined according to the luma data of sectional image
The extension backlight data of backlight in the backlight subarea answered, including：
The image around the first picture portion region and the first picture portion region point belonging to the sectional image
The difference and the preset mapping relations of third of reference luma data between region, determine the first picture portion region pair
The extension backlight data of backlight in the backlight subarea answered；Wherein, the reference luma data in each picture portion region is for referring to
Show the grey level in the picture portion region；The preset mapping relations of the third include：Difference is with reference to the difference of luma data and its
Relationship between corresponding extension backlight data；Each picture portion region includes at least two sectional images.
In the embodiment of the present invention, backlight source matrix is divided into the partitioned area of bigger, Fig. 4 is backlight subarea region/figure
As the division schematic diagram of partitioned area, as shown in figure 4, the backlight source matrix of liquid crystal display is divided into according to horizontal direction
3 subregions and column direction are divided into 3 subregions, and Integral back light source matrix is divided into 9 backlight subareas region；Accordingly, it presses
It (includes 9 picture portions that should mutually have 3*3 virtual partition according to the division rule in backlight subarea region, on liquid crystal display panel
Region), wherein each picture portion region includes multiple sectional images.Certainly, it can also be drawn according to other division rules
Point, the embodiment of the present invention is not restricted this.
In the embodiment of the present invention, the reference luma data in picture portion region is determined, optionally, according to the picture portion area
The ash of at least part pixel (it is of course also possible to being included all pixels point) in domain included by all sectional images
Exponent number determines the reference luma data in the picture portion region according to using predetermined grey order algorithm；Alternatively, according to the picture portion area
The ash of at least part pixel (it is of course also possible to being included all pixels point) in domain included by each sectional image
Exponent number determines the luma data of corresponding sectional image, further, according to the picture portion respectively according to using predetermined grey order algorithm
The luma data of each sectional image determines the reference luma data in the picture portion region using predetermined grey order algorithm in region；
Wherein, the reference luma data in the picture portion region is used to indicate the grey level in the picture portion region；Optionally, this is pre-
Fixed ash order algorithm can be maximum value-based algorithm, mean algorithm, weighted mean algorithm etc..Certainly, it can also determine otherwise
The reference luma data in the picture portion region, the embodiment of the present invention are not restricted this.
The preset mapping relations of third are previously stored in backlight luminance control apparatus in the embodiment of the present invention, wherein
The preset mapping relations of the third include：Difference is with reference to the pass between the corresponding extension backlight data of the difference of luma data
System；Optionally, in the preset mapping relations of the third, each different differences with reference to luma data can correspond to different extension backlights
Data, or the difference of the reference luma data in a certain range corresponds to identical extension backlight data (i.e. peak value
Current gain coefficient is identical), for example, the difference (nonnegative number) with reference to luma data belongs to 100-150 ranges, then it is larger in the two
The corresponding extension backlight data of reference luma data (i.e. minuend) be B (such as 11), smaller reference gray number in the two
It is C (such as 01) according to (i.e. subtrahend) corresponding extension backlight data.Optionally, the preset mapping relations of the third can be in table form
It is stored in the backlight luminance control apparatus, it is of course also possible to which other forms store, the embodiment of the present invention does not limit this
System.Optionally, if the reference luma data in some picture portion region is than the luma data in picture portion region around it bigger
More, the peak point current gain coefficient of backlight is bigger in the corresponding backlight subarea region in the picture portion region.
Further, as shown in figure 4, the first picture portion area belonging to the sectional image (such as sectional image F)
Picture portion region (such as picture portion region around domain (such as picture portion region 5) and the first picture portion region
1- picture portions region 4 and picture portion region 6- picture portions region 9) between reference luma data difference, and
The preset mapping relations of the third determine the extension backlight data of backlight in the corresponding backlight subarea in the first picture portion region
(the extension backlight data phase of backlight in the corresponding backlight subarea of each sectional image in the first picture portion region
Together), it also can determine the extension of backlight in the corresponding backlight subarea in picture portion region around the first picture portion region
Backlight data, to adjust separately corresponding backlight subarea area according to the extension backlight data of backlight in each backlight subarea region
The peak point current of backlight in domain.As shown in figure 4, if the reference luma data (such as 200) in picture portion region 5 is more than it
The reference luma data in surrounding picture portion region then determines the more of picture portion region 5 according to the preset mapping relations of the third
The extension backlight data of backlight is " 11 " (i.e. peak point current gain coefficient is 2), picture portion region 9 in a backlight subarea
The extension backlight data of backlight is " 10 " (i.e. peak point current gain coefficient is 1.5), remaining image in multiple backlight subareas
The extension backlight data of backlight is " 01 " (i.e. peak point current gain coefficient is 1) in multiple backlight subareas of partitioned area.
If the reference gray level data in a certain picture portion region are compared with the reference gray level data in picture portion region around it
It is much smaller, the expansion of backlight in multiple backlight subareas in the picture portion region can be determined according to the preset mapping relations of the third
It is " 00 " (i.e. peak point current gain coefficient is 0.5) to open up backlight data.Optionally, it in order to maintain display brightness, can properly increase
The basic backlight data of backlight, can not only be such that backlight is operated in as possible in multiple backlight subareas in the picture portion region
In the range of linearity of low current, to improve the gray scale response under low-light level, while corresponding backlight driver circuit can be also reduced
On voltage loss, increase to prevent stopping loss the backlight driver voltage that brings of consumption and pwm driver (such as metal-oxide-semiconductor) caused to overheat
Problem.
Optionally, on the basis of the above embodiments, determine that the sectional image corresponds to according to the luma data of sectional image
Backlight subarea in backlight extension backlight data, including：
The reference luma data in the first picture portion region belonging to the sectional image and the 4th preset mapping are closed
System determines that this refers to the corresponding second peak point current gain coefficient of luma data；Wherein, this is used to indicate this with reference to luma data
The grey level in the first picture portion region；4th preset mapping relations include：Difference is corresponding with reference to luma data
Relationship between peak point current gain coefficient；The first picture portion region includes at least two sectional images；
According to the second peak point current gain coefficient and the 5th preset mapping relations, the second peak point current gain is determined
The corresponding extension backlight data of coefficient；Wherein, the 5th preset mapping relations include：Different peak point current gain coefficients are right with it
Relationship between the extension backlight data answered.
The 4th preset mapping relations are previously stored in backlight luminance control apparatus in the embodiment of the present invention, wherein
4th preset mapping relations include：Difference is with reference to the relationship between the corresponding peak point current gain coefficient of luma data；
Optionally, each different that different peak point current gain systems can be corresponded to reference to luma data in the 4th preset mapping relations
Number, or the reference luma data in a certain range corresponds to identical peak point current gain coefficient, for example, with reference to ash
Exponent number is according to 155-175 ranges are belonged to, then corresponding peak point current gain coefficient is A.Optionally, the 4th preset mapping relations can
It is stored in table form in the backlight luminance control apparatus, it is of course also possible to other forms store, the embodiment of the present invention
This is not restricted.Further, the reference luma data in the first picture portion region belonging to the sectional image with
And the 4th preset mapping relations, determine that this refers to the corresponding second peak point current gain coefficient of luma data；Wherein, the subregion
The method of determination of the reference luma data in the first picture portion region belonging to image is referred in the above embodiment of the present invention
Recording mode about " the reference luma data for determining picture portion region " part determines that details are not described herein again.
The 5th preset mapping relations are previously stored in backlight luminance control apparatus in the embodiment of the present invention, wherein
5th preset mapping relations include：Relationship between the corresponding extension backlight data of different peak point current gain coefficients；
Different extension backlight datas corresponds to different peak point current gain coefficients.Optionally, the 5th preset mapping relations can be with table
The form (for example, shown in above-mentioned table 1) of lattice is stored in the backlight luminance control apparatus, it is of course also possible to which other forms are deposited
Storage, the embodiment of the present invention are not restricted this.
Further, according to the second peak point current gain coefficient and the 5th preset mapping relations, determine this second
The corresponding extension backlight data of peak point current gain coefficient (i.e. the first picture portion region corresponding first backlight subarea region
The extension backlight data of middle backlight, wherein the corresponding backlight subarea of each sectional image in the first picture portion region
The extension backlight data of middle backlight is all identical), so as to according to the extension backlight number of backlight in the first backlight subarea region
According to the peak point current of backlight in adjustment the first backlight subarea region (that is, according to the corresponding backlight point of the sectional image
The extension backlight data of backlight, adjusts the peak point current of backlight in the backlight subarea in area).
Optionally, on the basis of the above embodiments, backlight in the backlight subarea is adjusted according to the extension backlight data
Peak point current, including：
The internal reference voltage that the PWM output signal of pwm driver is adjusted according to the extension backlight data, to adjust the back of the body
The peak point current of backlight in light subregion.
In the embodiment of the present invention, according to the extension backlight data of backlight in the backlight subarea and extension backlight data with
Mapping relations between peak point current gain coefficient, it may be determined that the peak point current gain coefficient of backlight in the backlight subarea, and
Determine the peak current information after adjustment；Further, the PWM of pwm driver is adjusted according to the peak current information after adjustment
The internal reference voltage of output signal (for controlling the backlight in the backlight subarea) is carried on the back with reaching to adjust in the backlight subarea
The purpose of the peak point current of light source.
Optionally, on the basis of the above embodiments, backlight in the backlight subarea is adjusted according to the extension backlight data
Peak point current, including：
The internal reference electric current that the PWM output signal of pwm driver is adjusted according to the extension backlight data, to adjust the back of the body
The peak point current of backlight in light subregion.
In the embodiment of the present invention, according to the extension backlight data of backlight in the backlight subarea and extension backlight data with
Mapping relations between peak point current gain coefficient, it may be determined that the peak point current gain coefficient of backlight in the backlight subarea, and
Determine the peak current information after adjustment；Further, the PWM of pwm driver is adjusted according to the peak current information after adjustment
The internal reference electric current of output signal (for controlling the backlight in the backlight subarea) is carried on the back with reaching to adjust in the backlight subarea
The purpose of the peak point current of light source.
Similarly, by the same way respectively according to the extension backlight data of backlight in other backlight subareas, adjustment pair
The peak point current of backlight in backlight subarea is answered, details are not described herein again.
Certainly, in the embodiment of the present invention, which can also be adjusted according to the extension backlight data otherwise
The peak point current of middle backlight, the embodiment of the present invention are not restricted this.
Fig. 5 A are the backlight drive circuit functional block diagram of the method for the present invention embodiment, as shown in Figure 5A, backlight processing unit
The basic backlight data of backlight in each backlight subarea is mapped to the driving circuit of backlight in each corresponding backlight subarea
In, determine the duty ratio of corresponding PWM (assuming that basic backlight data is 0- according to the basic backlight data of each backlight subarea
255 brightness value, then brightness value is bigger, and the duty ratio of PWM is bigger), the duty ratio of the PWM determined is sent to PWM drivings
Device, pwm driver according to the duty ratio of those PWM to the backlight output control signal of corresponding backlight subarea, with control with it is right
The conducting situation for answering the connected metal-oxide-semiconductor of LED light string in backlight subarea, to control back light source brightness in corresponding backlight subarea；
At the same time, the extension backlight data of backlight in each backlight subarea is mapped to each corresponding backlight point by backlight processing unit
In area in the driving circuit of backlight, corresponding peak point current gain system is determined according to the extension backlight data of each backlight subarea
Number, and then the peak current information after corresponding adjustment is determined respectively, and the peak current information determined is sent to PWM
Driver, pwm driver correspond to adjustment according to those peak current informations and (are used per road PWM output signal per road PWM output signal
Backlight in the corresponding backlight subarea of control) internal reference voltage (such as Vref) or internal reference electric current, adjusted with reaching
The purpose of the peak point current of backlight in whole corresponding backlight subarea, to control back light source brightness in corresponding backlight subarea.
It should be noted that DC/DC converters are used to the voltage of power input being converted to LED light string required voltage,
But also the voltage for maintaining stabilization by the feedback of backfeed loop, protection detection can also be carried out to backlight processing unit,
Enable signal can be sent after the operation of backlight processing unit to DC/DC converters so that DC/DC converters start to backlight processing
Unit carries out protection detection, avoids overvoltage or overcurrent.
Duty ratio/current diagram that Fig. 5 B are adjusted for back light source brightness control method of the present invention.As shown in Figure 5 B, it flows
The current waveform for crossing LED illustrates the base realized using back light source brightness control method of the present invention in the duty ratio of adjustment PWM
On plinth, the peak point current (i.e. peak point current can be promoted) of backlight in adjustable backlight subregion is gone back, to back light source brightness
The dynamic range of adjustment is promoted, and then better image region contrast and display dynamic range may be implemented, with
Promote image quality effect.
Optionally, next LED luminance mutation flicker (flicker) problem of current strap is frequently adjusted in order to reduce, at backlight
Reason unit can to peak point current gain coefficient change be more than given threshold after just do electric current adjustment, while need to electric current adjustment do
The disposal of gentle filter of time-domain.
Fig. 6 is the structural schematic diagram of backlight luminance control apparatus embodiment one of the present invention.As shown in fig. 6, the present embodiment
Backlight luminance control apparatus, may include：Determining module 601 and adjustment module 602.
Wherein it is determined that module 601, for according to the luma data of sectional image, determining that the sectional image corresponds to respectively
Backlight subarea in backlight basic backlight data and extension backlight data；Wherein, the luma data packet of the sectional image
It includes：The luma data of at least part pixel in the sectional image；The basic backlight data is used to indicate the backlight
The duty ratio of the pulse width modulation (PWM) of backlight in subregion, the extension backlight data are used to indicate in the backlight subarea
The peak point current gain coefficient of backlight；
Module 602 is adjusted, for adjusting accounting for for the PWM of backlight in the backlight subarea according to the basic backlight data
Empty ratio, and according to the peak point current for extending backlight data and adjusting backlight in the backlight subarea, to control the back of the body
Back light source brightness in light subregion.
In backlight luminance control apparatus embodiment of the present invention, determining module is used for respectively according to the gray number of sectional image
According to determining in the corresponding backlight subarea of the sectional image the basic backlight data of backlight and extension backlight data；Adjust mould
Block is used to adjust the duty ratio of the pulse width modulation (PWM) of backlight in the backlight subarea according to the basic backlight data,
And the peak point current of backlight in the backlight subarea is adjusted according to the extension backlight data, to control the backlight subarea
Middle back light source brightness；As it can be seen that backlight luminance control apparatus of the present invention can be also adjustable on the basis of adjusting the duty ratio of PWM
The peak point current of backlight in whole backlight subarea, i.e. peak point current can be promoted, to which the dynamic of back light source brightness adjustment becomes
Change range to be promoted, and then better image region contrast and display dynamic range may be implemented, to promote image quality effect.
On the basis of embodiment shown in Fig. 6, optionally, as a kind of enforceable mode, determining module 601, specifically
For：
The reference luma data of the sectional image is determined according to the luma data of the sectional image；Wherein, the ginseng
Examine the grey level that luma data is used to indicate the sectional image；
Luma data and the first preset mapping relations are referred to according to described, are determined described with reference to luma data corresponding the
One peak point current gain coefficient；Wherein, the described first preset mapping relations include：Difference is with reference to the corresponding peak of luma data
The relationship being worth between current gain coefficient；
According to the first peak value current gain coefficient and the second preset mapping relations, first peak point current is determined
The corresponding extension backlight data of gain coefficient；Wherein, the described second preset mapping relations include：Different peak point current gain coefficients
Relationship between corresponding extension backlight data.
On the basis of embodiment shown in Fig. 6, optionally, as another enforceable mode, determining module 601, tool
Body is used for：
The figure around the first picture portion region and described first image partitioned area belonging to the sectional image
As the difference and the preset mapping relations of third of the reference luma data between partitioned area, described first image subregion is determined
The extension backlight data of backlight in the corresponding backlight subarea in region；Wherein, the reference luma data in each picture portion region
It is used to indicate the grey level of described image partitioned area；The preset mapping relations of third include：Difference refers to luma data
The corresponding extension backlight data of difference between relationship；Each picture portion region includes at least two block plans
Picture.
On the basis of embodiment shown in Fig. 6, optionally, as another enforceable mode, determining module 601, tool
Body is used for：
The reference luma data in the first picture portion region belonging to the sectional image and the 4th preset mapping
Relationship determines described with reference to the corresponding second peak point current gain coefficient of luma data；Wherein, described to be used for reference to luma data
Indicate the grey level of described first image partitioned area；The 4th preset mapping relations include：Difference refers to luma data
Relationship between corresponding peak point current gain coefficient；Described first image partitioned area includes at least two block plans
Picture；
According to the second peak point current gain coefficient and the 5th preset mapping relations, second peak point current is determined
The corresponding extension backlight data of gain coefficient；Wherein, the 5th preset mapping relations include：Different peak point current gain coefficients
Relationship between corresponding extension backlight data.
On the basis of the above embodiments, optionally, as another enforceable mode, module 602 is adjusted, it is specific to use
In：
The internal reference voltage that the PWM output signal of pwm driver is adjusted according to the extension backlight data, to adjust
State the peak point current of backlight in backlight subarea.
On the basis of the above embodiments, optionally, as another enforceable mode, module 602 is adjusted, it is specific to use
In：
The internal reference electric current that the PWM output signal of pwm driver is adjusted according to the extension backlight data, to adjust
State the peak point current of backlight in backlight subarea.
Backlight luminance control apparatus provided in this embodiment can be used for executing the above-mentioned back light source brightness control of the present invention
The technical solution of embodiment of the method, implementing principle and technical effect are similar, and details are not described herein again.
Fig. 7 is the structural schematic diagram of liquid crystal display embodiment of the present invention.As shown in fig. 7, liquid provided in this embodiment
Crystal display device may include：Backlight processing unit 701 and pwm driver 702.
Wherein, the backlight processing unit 701, for respectively according to the luma data of sectional image, determining the subregion
The basic backlight data of backlight and extension backlight data in the corresponding backlight subarea of image；Wherein, the ash of the sectional image
Exponent number is according to including：The luma data of at least part pixel in the sectional image；The basic backlight data is used to indicate
The duty ratio of the PWM of backlight in the backlight subarea, the extension backlight data are used to indicate backlight in the backlight subarea
The peak point current gain coefficient in source；
The backlight processing unit 701 is additionally operable to adjust backlight in the backlight subarea according to the basic backlight data
The duty ratio of the PWM in source, and according to the peak point current for extending backlight data and adjusting backlight in the backlight subarea；
The pwm driver 702, the duty ratio for the PWM after being adjusted according to the backlight processing unit generate first
Pwm control signal is to control back light source brightness in the backlight subarea；
The pwm driver 702 is additionally operable to the peak point current after being adjusted according to the backlight processing unit and generates second
Pwm control signal is to control back light source brightness in the backlight subarea.
Wherein, the liquid crystal display of the present embodiment can also include memory, for storing program and picture number it is believed that
Breath；Specifically, program may include program code, and said program code includes computer-managed instruction.Memory may include
Random access memory (random access memory, abbreviation RAM), it is also possible to further include nonvolatile memory (non-
Volatile memory), a for example, at least magnetic disk storage.
The liquid crystal display of the present embodiment can also include：Host processor chip, the journey for executing memory storage
Sequence, control other component (such as backlight processing unit and pwm driver), which executes above-mentioned back light source brightness control method such as, to be implemented
The technical solution of example, implementing principle and technical effect are similar with above-mentioned back light source brightness control method embodiment, herein no longer
It repeats.
Above-mentioned component is communicated by one or more bus.It will be understood by those skilled in the art that shown in Fig. 7
The structure of liquid crystal display does not constitute limitation of the invention, can also include components more more or fewer than diagram, or
Person combines certain components or different components arrangement.
In several embodiments provided herein, it should be understood that disclosed device and method can pass through it
Its mode is realized.For example, apparatus embodiments described above are merely indicative, for example, the unit or module
It divides, only a kind of division of logic function, formula that in actual implementation, there may be another division manner, such as multiple units or module
It can be combined or can be integrated into another system, or some features can be ignored or not executed.Another point, it is shown or
The mutual coupling, direct-coupling or communication connection discussed can be the indirect coupling by some interfaces, equipment or module
It closes or communicates to connect, can be electrical, machinery or other forms.
The module illustrated as separating component may or may not be physically separated, aobvious as module
The component shown may or may not be physical module, you can be located at a place, or may be distributed over multiple
In network element.Some or all of module therein can be selected according to the actual needs to realize the mesh of this embodiment scheme
's.
One of ordinary skill in the art will appreciate that：Realize that all or part of step of above-mentioned each method embodiment can lead to
The relevant hardware of program instruction is crossed to complete.Program above-mentioned can be stored in a computer read/write memory medium.The journey
When being executed, execution includes the steps that above-mentioned each method embodiment to sequence；And storage medium above-mentioned includes：ROM, RAM, magnetic disc or
The various media that can store program code such as person's CD.
Finally it should be noted that：The above embodiments are only used to illustrate the technical solution of the present invention., rather than its limitations；To the greatest extent
Present invention has been described in detail with reference to the aforementioned embodiments for pipe, it will be understood by those of ordinary skill in the art that：Its according to
So can with technical scheme described in the above embodiments is modified, either to which part or all technical features into
Row equivalent replacement；And these modifications or replacements, various embodiments of the present invention technology that it does not separate the essence of the corresponding technical solution
The range of scheme.
Claims (13)
1. a kind of back light source brightness control method, which is characterized in that including：
Respectively according to the luma data of sectional image, the basic back of the body of backlight in the corresponding backlight subarea of the sectional image is determined
Light data and extension backlight data；Wherein, the luma data of the sectional image includes：At least part in the sectional image
The luma data of pixel；The basic backlight data is used to indicate the pulse width modulation of backlight in the backlight subarea
The duty ratio of PWM, the extension backlight data are used to indicate the peak point current gain coefficient of backlight in the backlight subarea；
The duty ratio of the PWM of backlight in the backlight subarea is adjusted according to the basic backlight data, and according to the expansion
Exhibition backlight data adjusts the peak point current of backlight in the backlight subarea, to control back light source brightness in the backlight subarea.
2. according to the method described in claim 1, it is characterized in that, determining the block plan according to the luma data of sectional image
As the extension backlight data of backlight in corresponding backlight subarea, including：
The reference luma data of the sectional image is determined according to the luma data of the sectional image；Wherein, described with reference to ash
Exponent number is according to the grey level for being used to indicate the sectional image；
Luma data and the first preset mapping relations are referred to according to described, are determined described with reference to the corresponding first peak of luma data
It is worth current gain coefficient；Wherein, the described first preset mapping relations include：Difference is with reference to the corresponding peak value electricity of luma data
Relationship between flow enhancement coefficient；
According to the first peak value current gain coefficient and the second preset mapping relations, the first peak value current gain is determined
The corresponding extension backlight data of coefficient；Wherein, the described second preset mapping relations include：Different peak point current gain coefficients and its
Relationship between corresponding extension backlight data.
3. according to the method described in claim 1, it is characterized in that, determining the block plan according to the luma data of sectional image
As the extension backlight data of backlight in corresponding backlight subarea, including：
The image around the first picture portion region and described first image partitioned area point belonging to the sectional image
The difference and the preset mapping relations of third of reference luma data between region, determine described first image partitioned area
The extension backlight data of backlight in corresponding backlight subarea；Wherein, the reference luma data in each picture portion region is used for
Indicate the grey level of described image partitioned area；The preset mapping relations of third include：Difference refers to the difference of luma data
The relationship being worth between corresponding extension backlight data；Each picture portion region includes at least two sectional images.
4. according to the method described in claim 1, it is characterized in that, determining the block plan according to the luma data of sectional image
As the extension backlight data of backlight in corresponding backlight subarea, including：
The reference luma data and the 4th preset mapping relations in the first picture portion region belonging to the sectional image,
It determines described with reference to the corresponding second peak point current gain coefficient of luma data；Wherein, described to be used to indicate with reference to luma data
The grey level of described first image partitioned area；The 4th preset mapping relations include：Difference is with reference to luma data and its
Relationship between corresponding peak point current gain coefficient；Described first image partitioned area includes at least two sectional images；
According to the second peak point current gain coefficient and the 5th preset mapping relations, the second peak point current gain is determined
The corresponding extension backlight data of coefficient；Wherein, the 5th preset mapping relations include：Different peak point current gain coefficients and its
Relationship between corresponding extension backlight data.
5. according to the described method of any one of claim 1-4, which is characterized in that described according to the extension backlight data tune
The peak point current of backlight in the whole backlight subarea, including：
The internal reference voltage that the PWM output signal of pwm driver is adjusted according to the extension backlight data, to adjust the back of the body
The peak point current of backlight in light subregion.
6. according to the described method of any one of claim 1-4, which is characterized in that described according to the extension backlight data tune
The peak point current of backlight in the whole backlight subarea, including：
The internal reference electric current that the PWM output signal of pwm driver is adjusted according to the extension backlight data, to adjust the back of the body
The peak point current of backlight in light subregion.
7. a kind of backlight luminance control apparatus, which is characterized in that including：
Determining module, for respectively according to the luma data of sectional image, determining in the corresponding backlight subarea of the sectional image
The basic backlight data and extension backlight data of backlight；Wherein, the luma data of the sectional image includes：The block plan
The luma data of at least part pixel as in；The basic backlight data is used to indicate backlight in the backlight subarea
The duty ratio of pulse width modulation (PWM), the extension backlight data are used to indicate the peak value electricity of backlight in the backlight subarea
Flow enhancement coefficient；
Adjustment module, the duty ratio for adjusting the PWM of backlight in the backlight subarea according to the basic backlight data, with
And the peak point current of backlight in the backlight subarea is adjusted according to the extension backlight data, to control in the backlight subarea
Back light source brightness.
8. device according to claim 7, which is characterized in that the determining module is specifically used for：
The reference luma data of the sectional image is determined according to the luma data of the sectional image；Wherein, described with reference to ash
Exponent number is according to the grey level for being used to indicate the sectional image；
Luma data and the first preset mapping relations are referred to according to described, are determined described with reference to the corresponding first peak of luma data
It is worth current gain coefficient；Wherein, the described first preset mapping relations include：Difference is with reference to the corresponding peak value electricity of luma data
Relationship between flow enhancement coefficient；
According to the first peak value current gain coefficient and the second preset mapping relations, the first peak value current gain is determined
The corresponding extension backlight data of coefficient；Wherein, the described second preset mapping relations include：Different peak point current gain coefficients and its
Relationship between corresponding extension backlight data.
9. device according to claim 7, which is characterized in that the determining module is specifically used for：
The image around the first picture portion region and described first image partitioned area point belonging to the sectional image
The difference and the preset mapping relations of third of reference luma data between region, determine described first image partitioned area
The extension backlight data of backlight in corresponding backlight subarea；Wherein, the reference luma data in each picture portion region is used for
Indicate the grey level of described image partitioned area；The preset mapping relations of third include：Difference refers to the difference of luma data
The relationship being worth between corresponding extension backlight data；Each picture portion region includes at least two sectional images.
10. device according to claim 7, which is characterized in that the determining module is specifically used for：
The reference luma data and the 4th preset mapping relations in the first picture portion region belonging to the sectional image,
It determines described with reference to the corresponding second peak point current gain coefficient of luma data；Wherein, described to be used to indicate with reference to luma data
The grey level of described first image partitioned area；The 4th preset mapping relations include：Difference is with reference to luma data and its
Relationship between corresponding peak point current gain coefficient；Described first image partitioned area includes at least two sectional images；
According to the second peak point current gain coefficient and the 5th preset mapping relations, the second peak point current gain is determined
The corresponding extension backlight data of coefficient；Wherein, the 5th preset mapping relations include：Different peak point current gain coefficients and its
Relationship between corresponding extension backlight data.
11. according to the device described in any one of claim 7-10, which is characterized in that the adjustment module is specifically used for：
The internal reference voltage that the PWM output signal of pwm driver is adjusted according to the extension backlight data, to adjust the back of the body
The peak point current of backlight in light subregion.
12. according to the device described in any one of claim 7-10, which is characterized in that the adjustment module is specifically used for：
The internal reference electric current that the PWM output signal of pwm driver is adjusted according to the extension backlight data, to adjust the back of the body
The peak point current of backlight in light subregion.
13. a kind of liquid crystal display, which is characterized in that including：
Backlight processing unit and pulse width modulation (PWM) driver；
Wherein, the backlight processing unit, for according to the luma data of sectional image, determining that the sectional image corresponds to respectively
Backlight subarea in backlight basic backlight data and extension backlight data；Wherein, the luma data packet of the sectional image
It includes：The luma data of at least part pixel in the sectional image；The basic backlight data is used to indicate the backlight
The duty ratio of the PWM of backlight in subregion, the extension backlight data are used to indicate the peak value of backlight in the backlight subarea
Current gain coefficient；
The backlight processing unit is additionally operable to adjust the PWM of backlight in the backlight subarea according to the basic backlight data
Duty ratio, and the peak point current of backlight in the backlight subarea is adjusted according to the extension backlight data；
The pwm driver, the duty ratio for the PWM after being adjusted according to the backlight processing unit generate the first PWM controls
Signal is to control back light source brightness in the backlight subarea；
The pwm driver is additionally operable to the peak point current after being adjusted according to the backlight processing unit and generates the 2nd PWM control letters
Number to control back light source brightness in the backlight subarea.
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| WO2019000157A1 (en) * | 2017-06-26 | 2019-01-03 | 华为技术有限公司 | Method for controlling backlight power of liquid crystal display and liquid crystal display |
| CN107507581A (en) * | 2017-09-07 | 2017-12-22 | 天津大学 | The wide colour gamut display methods of HDR and system |
| CN107591131B (en) * | 2017-09-20 | 2020-07-21 | 海信视像科技股份有限公司 | Backlight driving method and device |
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| CN105185328B (en) * | 2015-09-01 | 2018-01-09 | 青岛海信电器股份有限公司 | Liquid crystal display brightness control method and device and liquid crystal display |
| CN105161064B (en) * | 2015-09-17 | 2018-06-26 | 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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