CN110379379A - A kind of backlight driving method and device, display device and storage medium - Google Patents
A kind of backlight driving method and device, display device and storage medium Download PDFInfo
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- CN110379379A CN110379379A CN201910703881.6A CN201910703881A CN110379379A CN 110379379 A CN110379379 A CN 110379379A CN 201910703881 A CN201910703881 A CN 201910703881A CN 110379379 A CN110379379 A CN 110379379A
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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
Abstract
The present invention provides a kind of backlight driving method and devices, display device and storage medium, wherein this method comprises: carrying out subregion to the image to be displayed according to the corresponding backlight distribution of image to be displayed；Determine the initial backlight value of the corresponding at least partly subregion of the image to be displayed and the first backlight value range of at least partly subregion；The initial backlight value of each subregion in at least partly subregion is modified according to the first backlight value range of at least partly subregion, determine the backlight value of subregion after correcting, and after amendment at least partly subregion the second backlight value range, wherein, the second backlight value range is less than the first backlight value range；Shining for corresponding brightness value is carried out according to the backlight value control backlight module corresponding region of subregion after the amendment.The technical issues of present invention leads to flashing for solving existing backlight drive easily.
Description
Technical field
The present invention relates to field of display technology, in particular to a kind of backlight driving method and device, display device and storage
Medium.
Background technique
Requirement with user to image quality is higher and higher, and the equipment such as computer, TV begin to use multi partition backlight
Show image.Specifically, Local Dimming (region backlight) technology often utilizes hundreds of LED (Light Emitting
Diode, light emitting diode) composition backlight replace CCFL (Cold Cathode Fluorescent Lamp, cold cathode are glimmering
Light lamp tube) backlight, each LED for forming backlight can be adjusted according to the light and shade of image, the high bright part in display image
Corresponding LED is adjustable to arrive maximum brightness, and it is bright to show that the corresponding LED of darkness part in image can be reduced accordingly simultaneously
Degree is even switched off, to reach optimal contrast.
In practical applications, when the display equipment of using area dimming mode watches dynamic menu (for example, video), often
The brightness of backlight in a region can change with the variation of scene.When backlight value transformation amplitude is excessive, human eye can perceive picture
The backlight of face behind jumps, to feel scintillation.For example, user is when wearing VR helmet equipment, due to there was only screen
Backlight is shining, even small backlight jump can be all detected by human eye, feels film flicker, greatly affected user
Viewing experience.For another example, for the display equipment of screen size very little, in order to guarantee enough backlight subareas, backlight
Transmission only have 4bit, at this time corresponding backlight brightness values only have 16 grades (correspondence image grayscale be 0,16,32 ..., 239,
255), in this case, even the variation of level-one backlight is all easy to be detected by human eye.
As it can be seen that existing backlight drive easily leads to the technical issues of flashing.
Summary of the invention
The embodiment of the present invention provides a kind of backlight driving method and device, display device and storage medium, existing for solving
The technical issues of having backlight drive easily leads to flashing.
In a first aspect, the embodiment of the invention provides a kind of backlight driving methods, comprising:
Subregion is carried out to the image to be displayed according to image to be displayed corresponding backlight distribution；
Determine the corresponding at least partly subregion of the image to be displayed initial backlight value and at least partly subregion
The first backlight value range；
According to the first backlight value range of at least partly subregion to each subregion in at least partly subregion
Initial backlight value is modified, the backlight value of subregion after determining amendment, and at least partly the second backlight value of subregion after amendment
Range, wherein the second backlight value range is less than the first backlight value range；
Shining for corresponding brightness value is carried out according to the backlight value control backlight module corresponding region of subregion after the amendment.
In the technical solution of the embodiment of the present invention, firstly, waiting showing to this according to the corresponding backlight distribution of image to be displayed
Diagram picture carries out subregion, then, it is determined that the initial backlight value of the corresponding at least partly subregion of the image to be displayed, and at least portion
First backlight value range of point subregion, then, according to this at least partly subregion the first backlight value range to each subregion just
Beginning backlight value is modified, and is determined the second backlight value range of at least partly subregion after amendment, is corrected rear second value backlight
Range is less than the first backlight value range.That is, according to the corresponding initial backlight situation of image to be displayed come at least partly
The initial backlight value of subregion is modified, so that revised second backlight value range is less than the first backlight value range, that is, is reduced
Image to be displayed at least partly subregion corresponding backlight value range.In this case, it is controlled according to the backlight value of subregion after amendment
Backlight module corresponding region processed carries out shining for corresponding brightness value, and range of luminance values is compared to image to be displayed initial backlight value
Corresponding range of luminance values is reduced, so that efficiently solving existing backlight drive easily leads to the technical issues of flashing,
Realize the display effect that display equipment is improved while inhibiting scintillation existing for backlight drive.
Optionally, at least partly the second backlight value range of subregion after the determining amendment, comprising:
Determine the first initial backlight for being greater than preset threshold in at least partly subregion in the initial backlight value of each subregion
Value；
According to the first initial backlight value, the coefficient of dynamics for adjusting each subregion initial backlight value is obtained；
By the initial backlight value of each subregion multiplied by the coefficient of dynamics, the backlight value of subregion after amendment, Yi Jixiu are determined
At least partly the second backlight value range of subregion after just.
In the technical solution of the embodiment of the present invention, firstly, determining the initial backlight value of each subregion at least partly subregion
In be greater than the first initial backlight value of preset threshold, and then according to the first initial backlight value, obtain for adjusting each subregion
The coefficient of dynamics of initial backlight value, then, by the initial backlight value of each subregion multiplied by the coefficient of dynamics, so that it is determined that after amendment
Second backlight value range of at least partly subregion after the backlight value of subregion, and amendment.That is, according to image to be displayed pair
The initial backlight situation answered determines the coefficient of dynamics for correcting each subregion backlight value at least partly, and then realizes pair
Effective amendment of each subregion backlight value, improves the accuracy rate of backlight drive.
Optionally, in the first backlight value range characterization at least partly subregion initial backlight value minimum backlight value and
Maximum backlight value numerical intervals, minimum backlight value and maximum at least partly in subregion after the second backlight value range characterization amendment
Backlight value numerical intervals.
Optionally, the calculation formula of the coefficient of dynamics is coefficient of dynamics:
Wherein, k is the coefficient of dynamics, LmaxFor the backlight value for meeting preset condition in the first initial backlight value
Brightness value corresponding to mean value.In the technical solution of the embodiment of the present invention, if coefficient of dynamics is greater than 1, show image to be displayed
Corresponding brightness value is larger, and corresponding backlight value is also larger, at this point, the initial backlight value of either partition is multiplied by the dynamical system
After number, the backlight value of the revised subregion will be tuned up, in this case, the corresponding backlight range of amendment front and back image to be displayed
It will be reduced, so as to effectively inhibit the scintillation of backlight drive.In the technical solution of the embodiment of the present invention, if dynamic
Coefficient shows that the corresponding brightness value of image to be displayed is smaller, corresponding backlight value is also smaller, at this point, either partition less than 1
Initial backlight value multiplied by the coefficient of dynamics after, the backlight value of the revised subregion will be turned down, in this case, amendment front and back
The corresponding backlight range of image to be displayed will be reduced, so as to effectively inhibit the scintillation of backlight drive.
Optionally, the backlight value control backlight module corresponding region according to subregion after the amendment carries out corresponding brightness
Value shines, comprising:
The backlight value of subregion after the amendment and light spread function are subjected to convolution, obtain smoothed out backlight value, wherein
The smooth spread function is for characterizing optical characteristics of the backlight module in corresponding region；
The backlight module corresponding region is controlled to shine according to brightness value corresponding to the smoothed out backlight value.
In the technical solution of the embodiment of the present invention, using for characterizing optical characteristics of the backlight module in corresponding region
Light spread function, carry out convolution with the backlight value of subregion after amendment, to realize effective simulation to practical backlight situation, into
And guarantee backlight effect.
Optionally, after obtaining smoothed out backlight value, the method also includes:
It is compensated according to pixel value of the smoothed out backlight value to each subregion of the image to be displayed, obtains phase
Pixel value after answering partition compensation.
In the technical solution of the embodiment of the present invention, according to smoothed out backlight value to the picture of each subregion of image to be displayed
Plain value compensates, and the compensated pixel value in respective partition is obtained, to improve the display effect of image to be displayed.
Optionally, described to be carried out according to pixel value of the smoothed out backlight value to each subregion of the image to be displayed
Compensation obtains the compensated pixel value in respective partition, comprising:
Nonlinear compensation is carried out according to pixel value of the smoothed out backlight value to each subregion of the image to be displayed,
Obtain the nonlinear compensation result of respective partition；
Increased using pixel value of the contrast-limited histogram equalization method to each subregion of the image to be displayed
Strength reason, obtains contrast-limited histogram equalization result；
According to the nonlinear compensation result and the contrast-limited histogram equalization as a result, to corresponding described to aobvious
Show that the pixel value of picture portion compensates, obtains the compensated pixel value in respective partition.
In the technical solution of the embodiment of the present invention, using contrast-limited histogram equalization method to image to be displayed
Enhancing processing is carried out, obtained processing result is combined together with nonlinear compensation result, to image to be displayed respective partition
Pixel value compensate, to improve the display effect of image to be displayed.
Optionally, after obtaining the compensated pixel value in respective partition, the method also includes:
It controls the display panel and shows the image to be displayed according to the compensated pixel value in respective partition.
Optionally, the initial backlight value of the corresponding at least partly subregion of the determination image to be displayed, comprising:
Determine the pixel value of each subregion in at least partly subregion；
By the average value of the pixel value of each subregion, it is determined as the initial backlight value of respective partition.
Second aspect, the embodiment of the invention also provides a kind of backlight drive devices, comprising: processor and memory,
In, the memory is stored with computer program, and the processor is used to read the program in the memory, executes above-mentioned back
Step described in optical drive method.
The third aspect, the embodiment of the invention also provides a kind of display devices, comprising: display panel, backlight module, as above
The backlight drive device.
Fourth aspect, the embodiment of the invention also provides a kind of storage mediums, are stored thereon with computer program, the meter
Calculation machine program realizes step described in above-mentioned backlight driving method when being executed by processor.
Detailed description of the invention
In order to more clearly explain the embodiment of the invention or the technical proposal in the existing technology, embodiment will be described below
Needed in attached drawing be briefly described, it should be apparent that, the accompanying drawings in the following description is only of the invention some
Embodiment.
Fig. 1 is a kind of flow diagram of backlight driving method provided in an embodiment of the present invention；
Fig. 2 is at least partly the second of subregion after determining amendment in a kind of backlight driving method provided in an embodiment of the present invention
The flow diagram of backlight value range；
Fig. 3 is the flow diagram of step S104 in a kind of backlight driving method provided in an embodiment of the present invention；
Fig. 4 is to obtain the compensated pixel value in respective partition in a kind of backlight driving method provided in an embodiment of the present invention
Flow diagram；
Fig. 5 is the structural schematic diagram of the backlight drive device provided in the embodiment of the present invention；
Fig. 6 is the structural schematic diagram of display device provided in an embodiment of the present invention.
Specific embodiment
" first ", " second " in description and claims of this specification and above-mentioned attached drawing etc. are for distinguishing difference
Object is not use to describe a particular order.In addition, term " includes " and their any deformation, it is intended that covering is not
Exclusive includes.Such as it contains the process, method, system, product or equipment of a series of steps or units and is not limited to
The step of listing or unit, but optionally further comprising the step of not listing or unit, or optionally further comprising for these
The intrinsic other step or units of process, method, product or equipment.
Referenced herein " embodiment " is it is meant that a particular feature, structure, or characteristic described can wrap in conjunction with the embodiments
Containing at least one embodiment of the present invention.Each position in the description occur the phrase might not each mean it is identical
Embodiment, nor the independent or alternative embodiment with other embodiments mutual exclusion.Those skilled in the art explicitly and
Implicitly understand, embodiment described herein can be combined with other embodiments.
In order to better understand the above technical scheme, below by attached drawing and specific embodiment to technical solution of the present invention
It is described in detail, it should be understood that the specific features in the embodiment of the present invention and embodiment are to the detailed of technical solution of the present invention
Thin explanation, rather than the restriction to technical solution of the present invention, in the absence of conflict, the embodiment of the present invention and embodiment
In technical characteristic can be combined with each other.
Fig. 1 is a kind of method flow diagram of backlight driving method provided by the embodiment of the present invention, specifically, the backlight
Driving method, comprising:
S101: subregion is carried out to the image to be displayed according to the corresponding backlight distribution of image to be displayed；
In the specific implementation process, firstly, determining image to be displayed, then, subregion is carried out to image to be displayed.It is specific next
It says, subregion is carried out to it according to the backlight distribution situation of image to be displayed.For example, according to 3 × 3 or 4 × 4 come to be shown
Image carries out subregion.
S102: determine the corresponding at least partly subregion of the image to be displayed initial backlight value and at least portion
Divide the first backlight value range of subregion；
In the specific implementation process, the first backlight value range is specially the first of the corresponding at least partly subregion of image to be displayed
Beginning backlight situation.Specifically, it after to picture portion to be shown, determines in the corresponding at least partly subregion of image to be displayed
The pixel value of each subregion.Then, specific next using the initial backlight value of each subregion of calculated for pixel values in each subregion
It says, using the average value of the pixel value of each subregion as the initial backlight value of respective partition.Then, it is determined that this is at least partly at the beginning of area
Minimum backlight value and maximum backlight value in beginning backlight value, and characterization minimum backlight value and the first of maximum backlight value numerical intervals
Backlight range.Similarly, at least partly subregion whole subregions corresponding for image to be displayed, whole subregions can be determined
Backlight value range, for example be 100~255.
S103: according to the first backlight value range of at least partly subregion to described at least partly each of subregion point
The initial backlight value in area is modified, the backlight value of subregion after determining amendment, and at least partly the second back of subregion after amendment
Light value range, wherein the second backlight value range is less than the first backlight value range；
In the specific implementation process, the corresponding at least partly revised backlight value range of subregion of the second backlight value range.Tool
For body, after determining amendment after the backlight value of subregion, minimum backlight value therein and maximum backlight value, and characterization are determined
The second backlight value range of the minimum backlight value and maximum backlight value numerical intervals.
In embodiments of the present invention, directly according to the corresponding initial backlight situation of image to be displayed, come at least partly dividing
The initial backlight value in area is modified, so that revised backlight value range is less than initial backlight value range.For example, first
Backlight value range is 100~255, and the second backlight value range is 240~255.That is, reducing image to be displayed at least partly subregion
Corresponding backlight value range.Easily cause to flash to efficiently solve existing backlight drive, and then influences the aobvious of display equipment
The technical issues of showing effect realizes while inhibiting scintillation existing for backlight drive, improves the aobvious of display equipment
Show effect.
S104: the hair of corresponding brightness value is carried out according to the backlight value control backlight module corresponding region of subregion after the amendment
Light.
In the specific implementation process, since the second backlight value range of at least partly subregion after amendment is less than image to be displayed
The first backlight value range (i.e. initial backlight value range) of corresponding subregion, the then at least partly revised backlight value range institute of subregion
Corresponding range of luminance values, range of luminance values corresponding to the initial backlight value range compared to image to be displayed respective partition have
It is reduced, to effectively inhibit scintillation.
In embodiments of the present invention, it can specifically determine that at least partly the second of subregion carries on the back after correcting in the following manner
Light value range, which are as shown in Figure 2:
S201: determine that be greater than preset threshold in at least partly subregion in the initial backlight value of each subregion first is initial
Backlight value；
S202: according to the first initial backlight value, the coefficient of dynamics for adjusting each subregion initial backlight value is obtained；
S203: by the initial backlight value of each subregion multiplied by the coefficient of dynamics, determining the backlight value of subregion after amendment, with
And after amendment at least partly subregion the second backlight value range.
In embodiments of the present invention, it specifically can be and the initial backlight value of each subregion traversed, determine to be greater than and preset
First initial backlight value of threshold value.The first initial backlight value is qualified multiple backlight values, which can be
Those skilled in the art's set numerical value according to actual needs.For example, determining number in at least partly initial backlight value of subregion
It is worth biggish backlight value.In embodiments of the present invention, it according to the first initial backlight value, obtains initial for adjusting each subregion
The coefficient of dynamics k of backlight value.In embodiments of the present invention, coefficient of dynamics k calculation formula are as follows:
In embodiments of the present invention, the initial backlight value of each subregion is greater than preset threshold in determining at least partly subregion
After first initial backlight value, the backlight value for meeting preset condition is determined according to the first initial backlight value.For example, this is default
Condition is that proportion is the preceding biggish backlight value of 5% numerical value in the first initial backlight value, and certainly, those skilled in the art can be with
Set the preset condition according to actual needs.After meeting the backlight value of preset condition in determining all subregions, determine
Brightness value L corresponding to corresponding mean valuemax。
In the specific implementation process, brightness value LmaxDifferent numerical value is often corresponded under different scenes, coefficient of dynamics k
It can be changed according to the difference of the scene brightness of image to be displayed, in the present embodiment, coefficient of dynamics k will be 0.6 to 3.0
Between change.That is, its Luminance Distribution situation of different images to be displayed is different, corresponding coefficient of dynamics k is also different.
In the specific implementation process, after determining for corresponding to image to be displayed the modified coefficient of dynamics of subregion,
By the initial backlight value of each subregion multiplied by coefficient of dynamics k, and then determine the backlight value of subregion after amendment.In this way, from
Minimum value and maximum value are determined after amendment in the backlight value of subregion, and then just determines after amendment at least partly the of subregion
Two backlight value ranges.For example, being 10~100 in the first backlight value range, coefficient of dynamics k is 0.6, then after being corrected, the second back
Light value range is 6~60, and the range is less than 10~100.Certainly, when at least partly subregion is whole subregions, using same
Processing method, can determine the backlight value range of whole subregions after amendment, and then realizes and repair to whole backlight value ranges
Just.
In embodiments of the present invention, it is determined according to the corresponding initial backlight situation of image to be displayed for correcting each point
The coefficient of dynamics of area's backlight value, and then effective amendment to each subregion backlight value is realized, improve the accurate of backlight drive
Rate.
In embodiments of the present invention, according to the first initial backlight value, acquisition is initially carried on the back for adjusting each subregion
After the coefficient of dynamics of light value, the method also includes:
If it is determined that the coefficient of dynamics is greater than 1, then after the initial backlight value of either partition is multiplied by the coefficient of dynamics, determine
The backlight value of the subregion is greater than the initial backlight value of the subregion after amendment.
In the specific implementation process, if coefficient of dynamics is greater than 1, show that the corresponding brightness value of image to be displayed is larger, therewith
Corresponding backlight value is also larger, at this point, after the initial backlight value of either partition is multiplied by the coefficient of dynamics, the revised subregion
Backlight value will be tuned up, for example, the initial backlight value of its a subregion of image to be displayed is 160, coefficient of dynamics k is 2, then after correcting
Backlight value be 255 (because maximum values no more than 255).As it can be seen that the corresponding backlight value of amendment front and back image to be displayed will be by
It reduces, so as to effectively inhibit the scintillation of backlight drive.
In embodiments of the present invention, according to the first initial backlight value, acquisition is initially carried on the back for adjusting each subregion
After the coefficient of dynamics of light value, the method also includes:
If it is determined that the coefficient of dynamics less than 1, then after the initial backlight value of either partition is multiplied by the coefficient of dynamics, determines
The backlight value of the subregion is less than the initial backlight value of the subregion after amendment.
In this specific implementation process, if coefficient of dynamics less than 1, shows that the corresponding brightness value of image to be displayed is smaller, with
Corresponding backlight value it is also smaller, at this point, after the initial backlight value of either partition is multiplied by the coefficient of dynamics, the revised subregion
Backlight value will be turned down.For example, the initial backlight value of its b subregion of image to be displayed is 50, coefficient of dynamics k is 0.6, then corrects
Backlight value afterwards is 30, and in this case, the corresponding backlight value of image to be displayed will be reduced after amendment, so as to effectively inhibit
The scintillation of backlight drive.
In embodiments of the present invention, due to coefficient of dynamics k can according to the difference of the scene brightness of image to be displayed dynamic
Adjustment can be realized after using identical modification method to different frame image to be displayed to different frame identical partitions brightness model
The adjustment enclosed.For example, initial backlight value corresponding to the c subregion of image to be displayed C is 150, revised backlight value is 255；
Initial backlight value with image to be displayed C consecutive frame image to be displayed D its c subregion is 100, and revised backlight value is 255.Not
It is 50 that front cross frame image to be displayed, which is corrected, in the difference of the backlight value of c subregion, and back of the two frame images to be displayed in c subregion after correcting
The difference of light value is 0, c subregion backlight flicker free after amendment.As it can be seen that for same subregion, flicker free between consecutive frame image, display
Effect is good.
In embodiments of the present invention, in order to improve backlight effect, referring to FIG. 3, step S104: according to after the amendment points
The backlight value control backlight module corresponding region in area carries out shining for corresponding brightness value, comprising:
S301: carrying out convolution for the backlight value of subregion after the amendment and light spread function, obtain smoothed out backlight value,
Wherein, the smooth spread function is for characterizing optical characteristics of the backlight module in corresponding region；
S302: it controls the backlight module corresponding region and is sent out according to brightness value corresponding to the smoothed out backlight value
Light.
In the specific implementation process, since there are light diffusions to imagine, in order to avoid blockiness, in control backlight module hair
Before light, it will be used to characterize the light spread function of the optical characteristics in backlight module corresponding region, the backlight with subregion after amendment
Value carries out convolution, obtains smoothed out backlight value, to realize effective simulation to practical backlight situation.Then, backlight is controlled
Mould group corresponding region shines according to brightness value corresponding to smoothed out backlight value, to ensure that backlight effect.
In embodiments of the present invention, in order to improve the display effect of image to be displayed, obtain smoothed out backlight value it
Afterwards, the method also includes:
It is compensated according to pixel value of the smoothed out backlight value to each subregion of the image to be displayed, obtains phase
Pixel value after answering partition compensation.
In the specific implementation process, it is mended according to pixel value of the smoothed out backlight value to each subregion of image to be displayed
It repays, the compensated pixel value in respective partition is obtained, to improve the display effect of image to be displayed.
In embodiments of the present invention, it in order to improve the display effect of image to be displayed, is illustrated in figure 4 through non-linear benefit
It repays and contrast-limited histogram equalization method, come the schematic diagram compensated to image to be displayed respective partition pixel.
Specifically, described to be compensated according to pixel value of the smoothed out backlight value to each subregion of image to be displayed, it obtains
The compensated pixel value in respective partition, comprising:
S401: it is carried out according to pixel value of the smoothed out backlight value to each subregion of the image to be displayed non-linear
Compensation, obtains the nonlinear compensation result of respective partition；
S402: using contrast-limited histogram equalization method to the pixel value of each subregion of the image to be displayed into
Row enhancing processing, obtains contrast-limited histogram equalization result；
S403: according to the nonlinear compensation result and the contrast-limited histogram equalization as a result, to it is described to
The pixel value of display image respective partition compensates, and obtains the compensated pixel value in respective partition.
In the specific implementation process, with specific reference to smoothed out backlight value to the pixel value of each subregion of image to be displayed into
Row nonlinear compensation obtains the nonlinear compensation result of respective partition.It specifically can be using following nonlinear compensation formula:
Wherein, BLfullExpression backlight all light, 255.BLi,j’Indicate the smoothed out backlight illumination of backlight, Yi,jBefore indicating compensation
Pixel value；Yi,j,Indicate pixel value after compensating, γ can be any value in 2.1~2.3, for example, television set, mobile phone are normal
γ can take 2.2 when display.
In the specific implementation process, specifically image to be displayed is each divided using contrast-limited histogram equalization method
The pixel value in area carries out enhancing processing, obtains contrast-limited histogram equalization result.Then, according to nonlinear compensation result
With contrast-limited histogram equalization as a result, compensating to the pixel value of corresponding image to be displayed subregion, corresponding point is obtained
The compensated pixel value in area.The compensated pixel value in respective partition is specifically obtained using following formula:
Yi,j=Li,j×Ni,j+(1-Li,j)×Ci,j
Wherein, Li,jFor the backlight value (i.e. smoothed out backlight value) of the corresponding practical backlight simulation of pixel, Ni,jIt is non-
Linear compensation is as a result, Ci,jFor contrast-limited histogram equalization result.
That is, in the specific implementation process, it, will be non-according to practical backlight analog result (i.e. smoothed out backlight value)
Both linear compensation result and contrast-limited histogram combine, and carry out enhancing processing to image to be displayed.Using the party
The contrast-limited histogram equalization result proportion of method, low brightness area is bigger, is corrected so low bright in rear image
The pixel value for spending region will be lower.The nonlinear compensation result proportion of high-brightness region is bigger, schemes after being corrected in this way
The pixel value of high-brightness region will be higher as in, to improve displaying contrast for image after amendment, improves image
Display effect.
In embodiments of the present invention, it after obtaining the compensated pixel value in respective partition, controls the display panel according to phase
Pixel value after answering partition compensation shows the image to be displayed.To improve the display effect of image to be displayed.
Based on the same technical idea, the embodiment of the present application also provides a kind of backlight drive device, the computer installations
The method in previous embodiment can be achieved.
Referring to FIG. 5, being the structural schematic diagram of backlight drive device provided in an embodiment of the present invention, the computer installation packet
It includes: processor 10, memory 20, transceiver 30 and bus interface.
Processor 10, which is responsible for management bus architecture and common processing, memory 20, can store processor 10 and is executing behaviour
Used data when making.Transceiver 30 for sending and receiving data under control of processor 10.
Bus architecture may include the bus and bridge of any number of interconnection, one or more specifically represented by processor 10
The various circuits for the memory that a processor and memory 20 represent link together.Bus architecture can also such as will be set periphery
Various other circuits of standby, voltage-stablizer and management circuit or the like link together, and these are all it is known in the art,
Therefore, it will not be further described herein.Bus interface provides interface.Processor 10 is responsible for management bus architecture and is led to
Normal processing, memory 20 can store the used data when executing operation of processor 10.
The process that the embodiment of the present invention discloses, can be applied in processor 10, or realized by processor 10.It is realizing
In the process, each step of signal processing flow can pass through the integrated logic circuit or software form of the hardware in processor 10
Instruction complete.Processor 10 can be general processor, digital signal processor, specific integrated circuit, field programmable gate
Array or other programmable logic device, discrete gate perhaps transistor logic, discrete hardware components may be implemented or
Execute disclosed each method, step and the logic diagram in the embodiment of the present invention.General processor can be microprocessor or
Any conventional processor etc..The step of route renewing method in conjunction with disclosed in the embodiment of the present invention, can be embodied directly in firmly
Part processor executes completion, or in processor hardware and software module combination execute completion.Software module can be located at
Random access memory, flash memory, read-only memory, programmable read only memory or electrically erasable programmable memory, register etc.
In the storage medium of this field maturation.The storage medium is located at memory 20, and processor 10 reads the information in memory 20, knot
Close the step of its hardware completes signal processing flow.
Specifically, the processor 10 executes described in above-mentioned route renewing method for reading the program in memory 20
Either step.
Based on identical inventive concept, referring to FIG. 6, the embodiment of the invention also provides the structural representations of display device
Figure.The display device includes: display panel 40, backlight module 50, backlight drive device as described above 60.
Based on the same technical idea, the embodiment of the present application also provides a kind of storage medium, it is stored thereon with computer
Program.Either step described in backlight driving method is realized when the computer program is executed by processor.
It should be understood by those skilled in the art that, embodiments herein can provide as method, system or computer program
Product.Therefore, complete hardware embodiment, complete software embodiment or reality combining software and hardware aspects can be used in the application
Apply the form of example.Moreover, it wherein includes the computer of computer usable program code that the application, which can be used in one or more,
The computer program implemented in usable storage medium (including but not limited to magnetic disk storage, CD-ROM, optical memory etc.) produces
The form of product.
The application be referring to according to the present processes, equipment (system) and computer program product flow chart and/or
Block diagram describes.It should be understood that each process that can be realized by computer program instructions in flowchart and/or the block diagram and/or
The combination of process and/or box in box and flowchart and/or the block diagram.It can provide these computer program instructions to arrive
General purpose computer, special purpose computer, Embedded Processor or other programmable data processing devices processor to generate one
Machine, so that being generated by the instruction that computer or the processor of other programmable data processing devices execute for realizing flowing
The device for the function of being specified in journey figure one process or multiple processes and/or block diagrams one box or multiple boxes.
These computer program instructions, which may also be stored in, is able to guide computer or other programmable data processing devices with spy
Determine in the computer-readable memory that mode works, so that it includes referring to that instruction stored in the computer readable memory, which generates,
Enable the manufacture of device, the command device realize in one box of one or more flows of the flowchart and/or block diagram or
The function of being specified in multiple boxes.
These computer program instructions also can be loaded onto a computer or other programmable data processing device, so that counting
Series of operation steps are executed on calculation machine or other programmable devices to generate computer implemented processing, thus in computer or
The instruction executed on other programmable devices is provided for realizing in one or more flows of the flowchart and/or block diagram one
The step of function of being specified in a box or multiple boxes.
Obviously, those skilled in the art can carry out various modification and variations without departing from the essence of the application to the application
Mind and range.In this way, if these modifications and variations of the application belong to the range of the claim of this application and its equivalent technologies
Within, then the application is also intended to include these modifications and variations.
Claims (12)
1. a kind of backlight driving method characterized by comprising
Subregion is carried out to the image to be displayed according to image to be displayed corresponding backlight distribution；
Determine the corresponding at least partly subregion of the image to be displayed initial backlight value and at least partly subregion
One backlight value range；
According to the first backlight value range of at least partly subregion to the initial of each subregion in at least partly subregion
Backlight value is modified, the backlight value of subregion after determining amendment, and at least partly the second backlight value range of subregion after amendment,
Wherein, the second backlight value range is less than the first backlight value range；
Shining for corresponding brightness value is carried out according to the backlight value control backlight module corresponding region of subregion after the amendment.
2. the method as described in claim 1, which is characterized in that at least partly the second backlight value of subregion after the determining amendment
Range, comprising:
Determine the first initial backlight value for being greater than preset threshold in at least partly subregion in the initial backlight value of each subregion；
According to the first initial backlight value, the coefficient of dynamics for adjusting each subregion initial backlight value is obtained；
By the initial backlight value of each subregion multiplied by the coefficient of dynamics, after determining the backlight value of subregion after amendment, and amendment
At least partly the second backlight value range of subregion.
3. the method as described in claim 1, which is characterized in that the first backlight value range characterization at least partly subregion
Minimum backlight value and maximum backlight value numerical intervals in initial backlight value, at least portion after the second backlight value range characterization amendment
Divide minimum backlight value and maximum backlight value numerical intervals in subregion.
4. method according to claim 2, which is characterized in that the calculation formula of the coefficient of dynamics is coefficient of dynamics:
Wherein, k is the coefficient of dynamics, LmaxFor meet in the first initial backlight value preset condition backlight value mean value
Corresponding brightness value.
5. the method as described in claim 1, which is characterized in that the backlight value according to subregion after the amendment controls backlight
Mould group corresponding region carries out shining for corresponding brightness value, comprising:
The backlight value of subregion after the amendment and light spread function are subjected to convolution, obtain smoothed out backlight value, wherein described
Light spread function is for characterizing optical characteristics of the backlight module in corresponding region；
The backlight module corresponding region is controlled to shine according to brightness value corresponding to the smoothed out backlight value.
6. method as claimed in claim 5, which is characterized in that after obtaining smoothed out backlight value, the method is also wrapped
It includes:
It is compensated according to pixel value of the smoothed out backlight value to each subregion of the image to be displayed, obtains corresponding point
The compensated pixel value in area.
7. method as claimed in claim 6, which is characterized in that it is described according to the smoothed out backlight value to described to be shown
The pixel value of each subregion of image compensates, and obtains the compensated pixel value in respective partition, comprising:
Nonlinear compensation is carried out according to pixel value of the smoothed out backlight value to each subregion of the image to be displayed, is obtained
The nonlinear compensation result of respective partition；
It is carried out at enhancing using pixel value of the contrast-limited histogram equalization method to each subregion of the image to be displayed
Reason obtains contrast-limited histogram equalization result；
According to the nonlinear compensation result and the contrast-limited histogram equalization as a result, to the corresponding figure to be shown
As the pixel value of subregion compensates, the compensated pixel value in respective partition is obtained.
8. the method for claim 7, which is characterized in that described after obtaining the compensated pixel value in respective partition
Method further include:
It controls the display panel and shows the image to be displayed according to the compensated pixel value in respective partition.
9. the method as described in claim 1, which is characterized in that the determination image to be displayed is corresponding at least partly to be divided
The initial backlight value in area, comprising:
Determine the pixel value of each subregion in at least partly subregion；
By the average value of the pixel value of each subregion, it is determined as the initial backlight value of respective partition.
10. a kind of backlight drive device characterized by comprising processor and memory, wherein the memory is stored with
Computer program, the processor are used to read the program in the memory, and perform claim requirement 1 to 9 is described in any item
Backlight driving method.
11. a kind of display device characterized by comprising display panel, backlight module, and it is as claimed in claim 10
Backlight drive device.
12. a kind of storage medium, which is characterized in that the program in the storage medium can be executed by processor, to realize power
Benefit requires 1 to 9 described in any item backlight driving methods.
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