CN107818762A - A kind of subregion method for controlling backlight thereof and picture processing chip - Google Patents
A kind of subregion method for controlling backlight thereof and picture processing chip Download PDFInfo
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- CN107818762A CN107818762A CN201610824801.9A CN201610824801A CN107818762A CN 107818762 A CN107818762 A CN 107818762A CN 201610824801 A CN201610824801 A CN 201610824801A CN 107818762 A CN107818762 A CN 107818762A
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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
- G09G3/3413—Details of control of colour illumination sources
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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
- G09G3/36—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 using liquid crystals
Abstract
The present invention discloses a kind of subregion method for controlling backlight thereof and picture processing chip, and described image process chip includes subregion backlight control unit, and image compensation unit and direct memory access DMA unit, method include：When subregion backlight control unit obtains the characteristic value of each subregion, interrupt handling routine is called, the interrupt handling routine includes：The algorithm of renewal, formula or driver；Using interrupt handling routine, according to the backlight value of each subregion of characteristic value calculating of each subregion；And backlight value is transmitted to backlight driver to control the brightness of backlight by SPI signal, the backlight value is sent to image compensation unit by DMA unit, so that described image compensating unit compensates according to the backlight value to the rgb value of image, this method calculates each subregion backlight value by using different interrupt handling routines, the upgrading and improvement to subregion backlight value-based algorithm are realized, optimizes the upgrading ability of picture processing chip.
Description
Technical field
The present invention relates to the backlight modulation technology of LCDs, more particularly to a kind of subregion method for controlling backlight thereof and
Picture processing chip.
Background technology
In LED liquid crystal display screen systems, mainly include LED liquid crystal displays, picture processing chip and backlight.Wherein, scheme
As process chip is used to compensate liquid crystal display images, and liquid crystal display is lighted by sending picture signal.Backlight is arranged on
Behind liquid crystal display, for lighting liquid crystal display, for the liquid crystal display that area is larger, multiple regions are typically divided into,
A backlight is provided with behind each subregion, each backlight is used to illuminate its corresponding partial liquid crystal screen region.
During liquid crystal display displays images, on the one hand picture processing chip needs to light by backlight driver each
The backlight of subregion, i.e., adjust the brightness of whole liquid crystal display by controlling the brightness of each backlight；On the other hand, image
Process chip, which also needs to control, wants the rgb value of display image on liquid crystal display, make liquid crystal screen display color and backlight it is bright
Degree matches, and specifically, the picture material that picture processing chip will be shown according to liquid crystal display, adjusts the brightness of each backlight,
And pixel value of image etc., to improve the dynamic contrast of image, strengthen the image quality sense of image.In order to further lift liquid crystal
The image quality of screen to picture processing chip, it is necessary to carry out upgrading renewal.
In addition, a chip needs time of more than 1 year from being designed into stably produce under normal circumstances, with liquid crystal display
The fast development of technology, generate the picture processing chip to dispatch from the factory and tend not to meet television manufacturer to backlight control function not
Same demand, or the demand for being designed without considering in chip, for example, the brightness irregularities that each backlight is lighted cause it is whole
Individual liquid crystal display image quality is bad, so, to improve the image quality of liquid crystal display images by upgrading to picture processing chip.
But after picture processing chip manufactures and completes and dispatch from the factory, any function in this chip can not all be carried out
Change and upgrading.So, it is impossible to more newly arrived by the upgrading to picture processing chip and improve the image quality of image, manufacturer can not be adapted to
Demand, and then cause the demand of the just picture processing chip of volume production to reduce, the life cycle of picture processing chip shortens.
The content of the invention
The invention provides a kind of subregion method for controlling backlight thereof and picture processing chip, to solve existing image procossing
Chip can not update the problem of upgrading once after dispatching from the factory.
In order to solve the above technical problems, disclosed concrete technical scheme is as follows：
In a first aspect, embodiment provides a kind of subregion method for controlling backlight thereof, applied to picture processing chip, described image
Process chip includes subregion backlight control unit, and image compensation unit and direct memory access DMA unit, methods described include：
When the subregion backlight control unit obtains the characteristic value of each subregion, interrupt handling routine is called, in described
Disconnected processing routine includes：The algorithm of renewal, formula or driver；Wherein, the characteristic value includes each picture in each subregion
Maximum, minimum value and the average value of vegetarian refreshments, the interrupt handling routine are used for the backlight value computational algorithm for inputting renewal, with
And realize the function of online modification；
Subregion backlight control unit uses the interrupt handling routine, is calculated according to the characteristic value of each subregion each
The backlight value of subregion；The interrupt handling routine is additionally operable to start the subregion backlight control unit, makes subregion backlight control list
Member performs the calculating and statistics to each subregion backlight value；
The backlight value is transmitted to backlight driver to control the brightness of backlight, also, by described in by SPI signal
Backlight value is sent to described image compensating unit by DMA unit, so that described image compensating unit is according to the backlight value pair
The rgb value of image compensates so that the brightness of the color of liquid crystal display and the backlight matches.
Further, if the characteristic value includes the maximum and average value of image in each subregion, according to
The backlight value that the characteristic value of each subregion calculates each subregion includes：Average value in each subregion and maximum are carried out
Weighted sum calculates, and obtains the backlight value of each subregion, and then realizes the renewal and modification to subregion backlight value, is increased with reaching
The effect of strong brightness of image and image quality.
Further, if being smoothing processing program in the interrupt handling routine, methods described also includes：Using institute
State smoothing processing program and space smoothing processing is done to the backlight value of each subregion, and, using the smoothing processing program to every
The backlight value of individual subregion does time smoothing processing.By being smoothed to backlight value so that the originally back of the body in each subregion
Light value is uniform, prevents that the backlight illumination gap of display is higher, influence overall liquid crystal display lights effect.
Further, when the subregion backlight control unit obtains the characteristic value of each subregion of picture processing chip statistics
Also include afterwards：Described image process chip triggers the hard break signal of the subregion backlight control unit, carries on the back the subregion
Light control unit prepares to handle the characteristic value, the interrupt handling routine for needing to call according to the selection of the species of hard break signal.
Wherein, the species of the hard break signal includes frame synchronization interrupt signal, row sync break signal, and DMA data is ready to interrupt
Deng.When the hard break signal triggers, DMA hardware parameter can be set by interrupt handling routine, to change or update
New algorithm or version, and then change the backlight value of subregion.
Further, methods described also includes：Described image compensation is single to receive what the subregion backlight control unit was sent
Backlight value；The penalty coefficient of image is calculated according to the backlight value；The rgb value of described image is carried out according to the penalty coefficient
Compensation, picture signal, and output described image signal are generated after compensation.Mended by the backlight value updated to each subregion
Repay so that the rgb value of the image after compensation matches with new backlight value brightness, what the liquid crystal display further optimized was shown
Image quality, meet the requirement of different vendor, so as to improve the service life of picture processing chip.
Second aspect, embodiment provide a kind of picture processing chip, and described image process chip includes：Image statisticses list
Member, subregion backlight control unit, image compensation unit and the first DMA unit, wherein, the subregion backlight control unit includes
Second DMA unit, connection bus, subregion backlight control unit are installed between first DMA unit and the second DMA unit
Data transfer is realized by the first DMA unit and the second DMA unit between described image statistic unit.
Described image statistic unit, for the characteristic value of each subregion in statistical picture, and by the first DMA unit by institute
State characteristic value and be sent to subregion backlight control unit；The subregion backlight control unit obtains the spy by the second DMA unit
Value indicative, and these characteristic values are stored in the register of subregion backlight control unit；
The subregion backlight control unit, for when receiving the characteristic value, calling interrupt handling routine；And use
The interrupt handling routine, the backlight value of each subregion is calculated according to the characteristic value of each subregion；And by the backlight
Value is sent to described image compensating unit by the second DMA unit, and the interrupt handling routine includes：The algorithm of renewal, it is public
Formula or driver etc.；Wherein, the interrupt handling routine can be additionally used in online updating and modification, and then increase at described image
Manage the function of chip；
Described image compensating unit, for receiving the backlight value by first DMA unit, according to the backlight value
The rgb value of image is compensated, output image signal after compensation.
Further, the subregion backlight control unit, it is additionally operable to by SPI signal transmit the backlight value to backlight
Driver, so that the backlight driver lights each backlight according to the backlight value of new production, and then change backlight
The purpose of brightness.
Further, the subregion backlight control unit, if including scheming in each subregion specifically for the characteristic value
The maximum and average value of picture, then read group total is weighted to the average value in each subregion and maximum, obtained every
The backlight value of individual subregion.
Further, described image compensating unit is specifically used for, and receives the backlight that the subregion backlight control unit is sent
Value；The penalty coefficient of image is calculated according to the backlight value；The rgb value of described image is mended according to the penalty coefficient
Repay, picture signal is generated after compensation；Described image signal is exported to light liquid crystal display.
Further, the subregion backlight control unit, it is additionally operable to when the DMA unit also generates hard break signal,
In the interrupt handling routine, DMA hardware parameter is set；The DMA unit, it is additionally operable to the characteristic value of the statistics being sent to
The subregion backlight control unit.
The third aspect, embodiment additionally provide a kind of subregion backlight control system, the subregion provided applied to first aspect
Method for controlling backlight thereof, the system include：Picture processing chip, liquid crystal display, backlight driver and at least one backlight, its
In, the liquid crystal display divides several subregions in advance, and a backlight is set behind each subregion,
Described image process chip is used for the characteristic value for counting each subregion, includes the maximum of each sectional image
Value, minimum value and average value, according to the characteristic value of statistics, call interrupt handling routine, and according to the interrupt handling routine and
Characteristic value calculates the backlight value of each subregion, and the backlight value is sent into the backlight driver；
Described image process chip is additionally operable to carry out the backlight value of each subregion of calculating image compensation, and by after compensation
Image rgb value exported by picture signal to the liquid crystal display, to light the liquid crystal display；
The backlight driver is used for the backlight value for receiving the transmission of described image process chip, and according to the backlight value point
The bright backlight.
Further, described image process chip is additionally operable to realize other implementations of the application first aspect.
Fourth aspect, embodiment also provide a kind of computer-readable storage medium, wherein, the computer-readable storage medium can be stored with
Program, the program perform when may include the application provide a kind of subregion method for controlling backlight thereof each implementation in part or
Overall Steps.
A kind of the subregion method for controlling backlight thereof and picture processing chip that the application provides, the picture processing chip include
Subregion backlight control unit and direct memory access DMA unit, wherein, being provided with the subregion backlight control unit has upgrading
The interrupt handling routine of more New function, DMA unit are used to the data updated in interrupt handling routine being transferred to image procossing core
Other components in piece.Therefore, the subregion method for controlling backlight thereof that the application provides is used different by subregion backlight control unit
Interrupt handling routine calculate each subregion backlight value, realize the upgrading and improvement to subregion backlight value-based algorithm, then will improve
Backlight value afterwards is transmitted to image compensation unit by the DMA unit and does compensation deals, and by the backlight value export to
Backlight driver, the brightness to each subregion backlight and the change of the rgb value of liquid crystal display images are realized, meets different vendor
To the demand of back light source brightness and liquid crystal display color, the upgrading ability of picture processing chip is optimized, so as to improve at image
The adaptability of chip is managed, extends the life cycle of picture processing chip.
Brief description of the drawings
In order to illustrate more clearly of the technical scheme in the embodiment of the present application, make required in being described below to embodiment
Accompanying drawing is briefly described, it should be apparent that, for those of ordinary skills, do not paying creative work
Property on the premise of, other accompanying drawings can also be obtained according to these accompanying drawings.
Fig. 1 is a kind of structural representation for picture processing chip that the embodiment of the present application provides；
Fig. 2 is a kind of schematic flow sheet for subregion method for controlling backlight thereof that the embodiment of the present application provides；
Fig. 3 is a kind of schematic flow sheet for image compensation method that the embodiment of the present application provides；
Fig. 4 is a kind of flow chart of the local backlight control for software and hardware combined control that the embodiment of the present application provides；
Fig. 5 is a kind of structural representation for subregion backlight control apparatus that the embodiment of the present application provides；
Fig. 6 is a kind of system schematic for software and hardware combined control local backlight that the embodiment of the present application provides.
Embodiment
Here exemplary embodiment will be illustrated in detail, its example is illustrated in the accompanying drawings.Following description is related to
During accompanying drawing, unless otherwise indicated, the same numbers in different accompanying drawings represent same or analogous key element.Following exemplary embodiment
Described in embodiment do not represent and the consistent all embodiments of the present invention.On the contrary, they be only with it is such as appended
The example of the consistent apparatus and method of some aspects being described in detail in claims, of the invention.
The embodiment of the present application provide a kind of subregion method for controlling backlight thereof be used for picture processing chip carry out upgrading and more
Newly.Lead to not upgrading renewal, this Shen to solve the problems, such as that picture processing chip of the prior art is fixed due to hardware capability
Subregion backlight control unit (English is please set up in existing picture processing chip：Partitioned BL Controller),
The structure of the specific picture processing chip is as shown in Figure 1.
A kind of picture processing chip, the picture processing chip include subregion backlight control unit, image compensation unit and straight
Connect memory access (English：Direct Memory Access, abbreviation：DMA) unit, wherein, the subregion backlight control unit
Equivalent to CPU, for calculating the backlight value of each subregion in image, and other processing functions.The DMA unit is used
In transmission data, subregion backlight control unit is realized respectively with image statisticses unit, and data are led between image compensation unit
Letter interaction.
Optionally, the subregion backlight control unit includes the second DMA unit, and described image process chip includes
One DMA unit, connected between the first DMA unit and the second DMA unit by transfer bus.
The picture processing chip that the embodiment of the present application provides, by being set up on the basis of existing picture processing chip point
Area's backlight control unit and DMA unit, to realize the upgrading and renewal to picture processing chip, specific method is as follows：
As shown in Figure 2, there is provided a kind of subregion method for controlling backlight thereof, applied to picture processing chip, described image processing
Chip includes subregion backlight control unit, and image compensation unit and direct memory access DMA unit, methods described include：
Step 201：When the subregion backlight control unit obtains the characteristic value of each subregion, interrupt processing journey is called
Sequence, the interrupt handling routine include：The program of the needs such as the algorithm of renewal, formula or driver renewal upgrading.It is described
Characteristic value includes the maximum of image in each subregion, minimum value and average value.
Step 202：Using the interrupt handling routine, according to the back of the body of each subregion of characteristic value calculating of each subregion
Light value.
Optionally, if the interrupt handling routine includes smoothing processing program, the smoothing processing program is used
Smoothing processing is done to the characteristic value of each subregion, and generates the backlight value corresponding with each subregion.By to each point
The characteristic value in area does smoothing processing so that the backlight illumination of each subregion is uniform, prevent the brightness of some subregion larger or compared with
Image quality on dark and then influence liquid crystal display.
Wherein, DMA hardware parameter can be arranged as required in interrupt handling routine, calculates the algorithm of backlight value, with
And other processing routines are to increase the function of picture processing chip.
Step 203：The backlight value is transmitted to backlight driver to control the brightness of backlight by SPI signal, and
And the backlight value is sent to described image compensating unit by DMA unit, so that described image compensating unit is according to
Backlight value compensates to the rgb value of image so that the brightness of the color of liquid crystal display and the backlight matches.
The present embodiment provide subregion method for controlling backlight thereof, the picture processing chip include subregion backlight control unit with
Direct memory access DMA unit, wherein, the interrupt processing with upgrading more New function is provided with the subregion backlight control unit
Program, DMA unit are used for the other components being transferred to the data updated in interrupt handling routine in picture processing chip.Cause
This, the subregion method for controlling backlight thereof that the application provides is calculated by subregion backlight control unit using different interrupt handling routines
Each subregion backlight value, upgrading and improvement to subregion backlight value-based algorithm are realized, then the backlight value after improvement passed through described
DMA unit is transmitted to image compensation unit and does compensation deals, and the backlight value is exported to backlight driver, is realized pair
The brightness of each subregion backlight and the change of the rgb value of liquid crystal display images, meet different vendor to back light source brightness and liquid crystal
Shield the demand of color, optimize the upgrading ability of picture processing chip, so as to improve the adaptability of picture processing chip, extend
The life cycle of picture processing chip.
In a specific embodiment, subregion backlight control unit obtains the characteristic value of each subregion, the spy first
Value indicative includes maximum, minimum value and the average value of all rgb values in each subregion, for example, setting one of subregion (k, l)
Region representation is Region (k, l), and k represents the row coordinate of each subregion, and l represents the row coordinate of subregion, then according to the spy
The backlight value of subregion where value indicative can calculate it according to equation below：
Backlight_value (k, l)=K0·Region_Mean(k,l)+K1·(Region_Max(k,l)-
Region_Min(k,l))
Wherein, backlight_value (k, l) represents the backlight value of (k, l) subregion, and Region_Mean (k, l) is represented
The average value of the image value of each pixel in (k, l) subregion, Region_Max (k, l) represent each pixel in (k, l) subregion
The maximum of the image value of point, Region_Min (k, l) represent the minimum value of the image value of each pixel in (k, l) subregion,
Also, K0,K1Real number of the value between (0,2).
Further, if the interrupt handling routine is smoothing processing program, the smoothing processing program pair is used
The characteristic value of each subregion carries out functional operation, and concrete operation process includes：
Space smoothing processing is carried out to the backlight value BL (k, l) of each subregion, the present embodiment is illustrated with 3 × 3 template
Space smoothing processing, wherein, 3 × 3 template refers to that the backlight value of 9 subregions centered on (k, l) is put down for doing space
Sliding processing.
Wherein, BL_SP (k, l) is that the backlight value of (k, l) subregion is spatially smoothed the backlight value generated after processing.
Time smoothing processing is carried out to the backlight value BL (k, l) of each subregion, specific formula for calculation is as follows：
BL_TP (k, l, n)=BL_TP (k, l, n-1)+Kt (BL (k, l, n)-BL_TP (k, l, n-1))
Wherein, BL_TP (k, l, n) is that the characteristic value of (k, l) subregion is spatially smoothed the backlight value after processing, Kt=
LUT (d), also, d=| BL (k, l, n)-BL_TP (k, l, n-1) |, LUT (English：Look up table, Chinese：Look-up table)
For representing the function corresponding relation between Kt and d, you can to search the Kt values corresponding to d by LUT, Kt represents to strengthen system
Number, d represent the absolute value of the difference of adjacent two frames backlight value.
In the present embodiment, according to the statistical value of each subregion, the backlight value of each subregion is calculated, and backlight value is carried out
Smoothing processing, the method for calculating can be with online modification, and this is the improvement of backlight value computational algorithm, upgrading, is adapted to different
Client needs the realization rate that provides, and then overcomes after existing picture processing chip once dispatches from the factory that institute is functional to repair
The problem of changing.
Wherein, the above method also includes：By the backlight value BL_TP of each subregion after smoothing processing (k,
L, n) back light driving device is sent to by backlight data (SPI) signal.
The number of partitions (m × n) of compensatory zone and the number of partitions (M × N) of backlight area of described image are set respectively, its
In, m represents the line number of the subregion of compensation image, and n represents the columns of the subregion of compensation image, and M represents liquid crystal display horizontal direction point
Area's number, N represent the number of partitions in liquid crystal display vertical direction；The backlight area point is generated according to the backlight value of each subregion
The data matrix of area's number；The data matrix of the backlight area number of partitions is zoomed to the number corresponding to the number of partitions of compensatory zone
According to matrix；According to the backlight value of the data matrix generation image compensation after the scaling.
It should be noted that the backlight value at diverse location is represented with different symbols in the above-described embodiments, so as to energy
Enough distinguish clear.
After image compensation unit obtains the subregion backlight value calculated, the rgb value of image is compensated, specifically compensated
Journey is as shown in Figure 3.
Step 301：Image compensation unit receives the backlight value that the subregion backlight control unit is sent；
Step 302：The penalty coefficient of image is calculated according to the backlight value；
Step 303：The rgb value of described image is compensated according to the penalty coefficient, picture signal is generated after compensation,
And described image signal is exported to liquid crystal display or liquid crystal panel timing control unit.
Further illustrate, picture processing chip triggering DMA unit, picture processing chip is transferred data to by DMA unit
Register section, DMA complete transmission after notify picture processing chip.After picture processing chip receives the notice, image compensation
Unit reads the backlight value of each subregion from the register section of picture processing chip, and according to backlight value, picture processing chip is to figure
As data are compensated as follows.
Rc (i, j)=R (i, j) pixel_gain
Gc (i, j)=G (i, j) pixel_gain
Bc (i, j)=B (i, j) pixel_gain
Wherein, pixel_gain=255/bl (i, j),
Blk_height represents the length of each picture portion, and blk_width represents the width of each picture portion, gain
Penalty coefficient, Rc (i, j), Gc (i, j) are represented, Bc (i, j) represents the image rgb value after compensation, and the rgb value after these compensation can
Represented by picture signal, image compensation unit by these signal outputs to liquid crystal display timing control unit (Tcon), and then
Point liquid crystal display.
The backlight value updated in the present embodiment by image compensation unit to each subregion compensates so that after compensation
The rgb value of image matches with new backlight value brightness, the image quality that the liquid crystal display further optimized is shown, meets not
With the requirement of manufacturer, so as to improve the service life of picture processing chip.
In another embodiment, above-mentioned steps 201：When the subregion backlight control unit obtains picture processing chip system
Also include after the characteristic value of each subregion of meter：
Picture processing chip triggers the hard break signal of the subregion backlight control unit, makes the subregion backlight control list
Member prepares to handle the characteristic value；The interrupt handling routine for needing to call according to the selection of the species of hard break signal.Specifically, exist
When frame synchronizing signal per frame produces, the hard break signal of picture processing chip triggering DMA generations, the hard break signal is used to make
Subregion backlight control unit interrupts currently processed program, is ready to carry out the operation of step 202.Set in the interrupt routine of calling
DMA hardware parameter is put, these characteristic values and DMA hardware parameter are copied to subregion backlight control unit from picture processing chip
Register section.
In the present embodiment, data can be copied directly in CPU by DMA unit, be not required to CPU participations, and then saved CPU
Expense, after DMA completes data copy, subregion backlight control unit is notified to handle characteristic value.
Further, before above-described embodiment step 201, methods described also includes figure of the picture processing chip to acquisition
As signal is handled, specifically, processing is carried out to picture signal includes data signal noise reduction, analog signal noise reduction, and image contracts
Put, definition enhancing, frame rate conversion, color enhancement, contrast enhancing etc., picture processing chip is complete to described image signal transacting
Cheng Houzai performs the method flow of above-mentioned steps 201 to 203.
In a specific embodiment, as shown in figure 4, a kind of flow of the local backlight control of software and hardware combined control
Figure, methods described comprise the following steps：
Step 401：Picture processing chip pre-processes to described image.The pretreatment includes：Data signal noise reduction,
The processing such as analog signal noise reduction, image scaling, definition enhancing, frame rate conversion, color enhancement, contrast enhancing.
Step 402：View data counts.Image statisticses unit counts to view data, and calculating divides each in advance
The characteristic value of individual subregion, including, the maximum of the image value of each pixel, minimum value and average value in each subregion.
Step 403：View data statistical value deposit chip register area.
Step 404：When frame starts, CPU triggering DMA unit operations.Set by CPU in the interrupt handling routine of calling
DMA hardware parameter.The DMA hardware parameter includes needing the address data memory accessed, reads or writes data length.The CPU
Include DMA unit and subregion backlight control unit.
Step 405：Interrupt signal is triggered after the completion of DMA unit operation.When the synchronizing signal of every frame produces, image procossing
Chip triggers CPU hard break signal, so that the DMA generation hard break signals in the CPU.
Step 406：CPU calls interrupt routine to calculate backlight value, wherein, the interrupt routine includes needs renewal upgrading
Software, algorithm, the content such as program code, generate the backlight value of each subregion.
Step 407：The backlight value of each subregion is sent to backlight driver by CPU by SPI, so that the backlight drive
Device controls each backlight to light.
Step 408：CPU changes backlight area to picture portion；
Step 409：CPU triggering DMA unit operations；
Step 410：Signal is completed in triggering after the completion of DMA unit operation；CPU sends out the backlight value of calculating by DMA unit
Give picture processing chip；
Step 411：Picture processing chip carries out dizzy processing to backlight value, and the data after processing are sent into image compensation
Unit；
Step 412：Image compensation unit compensates to the rgb value of image；
Step 413：Picture signal is generated after compensation, and exports described image signal to LCDs or liquid crystal panel
Timing control unit.By being compensated to pixel value so that the backlight value after renewal upgrading can adapt to the color of liquid crystal display,
And then enhance image quality effect.
Corresponding to the embodiment of preceding method, present invention also provides a kind of subregion backlight control apparatus, as shown in figure 5,
The device includes acquiring unit 501, processing unit 502 and transmitting element 503.
Acquiring unit 501, for obtaining the characteristic value of each subregion, and interrupt handling routine is called, at the interruption
Reason program includes：The algorithm of renewal, formula or driver；
Processing unit 502, for using the interrupt handling routine, calculated according to the characteristic value of each subregion each
The backlight value of subregion；
Transmitting element 503, for the backlight value to be transmitted to backlight driver to control backlight by SPI signal
Brightness, also, the backlight value is sent to described image compensating unit by DMA unit, so that described image compensating unit
The rgb value of image is compensated according to the backlight value so that the brightness of the color of liquid crystal display and the backlight matches.
Further, the processing unit 502, if being additionally operable to the characteristic value includes the maximum of image in each subregion
Value and average value, then read group total is weighted to the average value in each subregion and maximum, obtains each subregion
Backlight value.
Optionally, if being smoothing processing program in the interrupt handling routine, the processing unit 502 is specifically used for
Space smoothing processing is done to the backlight value of each subregion using the smoothing processing program, and, use the smoothing processing journey
The backlight value of each subregion of ordered pair does time smoothing processing so that the backlight value originally in each subregion is uniform, prevents display
Backlight illumination gap is higher, and influence overall liquid crystal display lights effect.
Further, if the interrupt handling routine is goes halation program, subregion backlight control unit is calculated and carried on the back
Light value carries out halation and handled.In addition, the interrupt handling routine can also set different functions according to manufacturer's demand.
Further, the processing unit 502, it is additionally operable to when the subregion backlight control unit obtains picture processing chip
After the characteristic value of each subregion of statistics, hard break signal is generated, is made described in the subregion backlight control unit preparation processing
Characteristic value；And the interrupt handling routine for needing to call according to the selection of the species of hard break signal.The kind of the hard break signal
Class includes frame synchronization interrupt signal, row sync break signal, and DMA data gets out interruption etc..Triggered in the hard break signal
When, DMA hardware parameter can be set by interrupt handling routine, either update new algorithm or version, Jin Ergai to change
Become the backlight value of subregion.
In another embodiment, a kind of picture processing chip is also disclosed, as shown in figure 1, picture processing chip includes：
Image statisticses unit, subregion backlight control unit, image compensation unit and direct memory access DMA unit,
Described image statistic unit, for the characteristic value of each subregion in statistical picture, and by DMA unit by the spy
Value indicative is sent to subregion backlight control unit；
The subregion backlight control unit, for when receiving the characteristic value, calling interrupt handling routine；And use
The interrupt handling routine, the backlight value of each subregion is calculated according to the characteristic value of each subregion；And by the backlight
Value is sent to described image compensating unit by DMA unit, and the interrupt handling routine includes：The algorithm of renewal, formula or
Driver；
Described image compensating unit, for receiving the backlight value by the DMA unit, according to the backlight value to figure
The rgb value of picture compensates, output image signal after compensation.
The subregion backlight control unit, it is additionally operable to by SPI signal transmit the backlight value to backlight driver, with
The backlight driver is set to light backlight.
Further, the subregion backlight control unit, if including scheming in each subregion specifically for the characteristic value
The maximum of picture, minimum value and average value, then to the maximum in each subregion, minimum value and average value are weighted and asked
And calculating, and then obtain the backlight value of each subregion.
Further, described image compensating unit is specifically used for, and receives the backlight that the subregion backlight control unit is sent
Value；The penalty coefficient of image is calculated according to the backlight value；The rgb value of described image is mended according to the penalty coefficient
Repay, picture signal is generated after compensation；Export described image signal.
Further, the subregion backlight control unit, it is additionally operable to when the DMA unit also generates hard break signal,
In the interrupt handling routine, DMA hardware parameter is set；
The DMA unit, it is additionally operable to the characteristic value of the statistics being sent to the subregion backlight control unit, so as to keep away
Exempt from subregion backlight control unit and participate in data transfer overload, and then can save mono- by subregion backlight control unit and the DMA
The integrated CPU of member, so as to save CPU expense.
The application provide picture processing chip, in picture processing chip increase subregion backlight control unit and directly in
Access DMA unit, due to being provided with the interrupt handling routine with upgrading more New function in the subregion backlight control unit, because
This, calculates each subregion backlight value by using different interrupt handling routines, realizes the upgrading to subregion backlight value-based algorithm
And improvement, then the backlight value after improvement is exported to backlight driver and image compensation unit, realize to each subregion backlight
The brightness in source and the change of the rgb value of liquid crystal display images, meet the needs of different vendor is to back light source brightness and liquid crystal display color,
The upgrading ability of picture processing chip is optimized, so as to improve the adaptability of picture processing chip, extends image procossing core
The life cycle of piece.
Applied to the embodiment of the above method and device, the present embodiment additionally provides a kind of subregion backlight control system, institute
The system of stating includes：Picture processing chip 610, liquid crystal display 640, backlight driver 620 and at least one backlight 630, wherein, institute
State liquid crystal display and divide several subregions in advance, a backlight 630 is set behind each subregion.
Described image process chip 610 is used for the characteristic value for counting each subregion, including each picture of each sectional image
The maximum of the image value of vegetarian refreshments, minimum value and average value, according to the characteristic value of statistics, call interrupt handling routine, and according to
The interrupt handling routine and characteristic value calculate the backlight value of each subregion, and the backlight value is sent into the backlight and driven
Dynamic device.
Described image process chip 610 is additionally operable to carry out the backlight value of each subregion of calculating image compensation, and will mend
Image rgb value after repaying is exported to the liquid crystal display by picture signal, to light the liquid crystal display.
The backlight driver 620 is used for the backlight value for receiving the transmission of described image process chip 610, and according to the back of the body
Light value lights the backlight 630.
Wherein described image process chip 610 includes：Subregion backlight control unit 611, image compensation unit 612, image
Statistic unit 613 and DMA unit 614.And the subregion backlight control unit 611, image compensation unit 612, image statisticses list
Member 613 and DMA unit 614 respectively with the subregion backlight control unit in previous embodiment, image compensation unit, image statisticses list
Member and DMA unit function phase are same.
Wherein, the liquid crystal display 640 can be TV core plate (English：TV Board), it is used in backlight driver give birth to
Produce the liquid crystal display timing control unit (English of picture signal：Tcon).In the upgrading development of picture processing chip is realized,
External signal is inputted to TV core plate, and after the processing such as TV core plate is decoded to external signal, scaled, data are sent into
Subregion backlight control unit, the subregion backlight value control unit extracted to backlight value, is handled and corresponding image compensation etc.
Processing, picture signal are sent into Tcon to realize lighting for liquid crystal display, and liquid crystal display timing control unit produces subregion according to backlight value
Backlight signal, and the subregion backlight signal is sent to backlight, light backlight.
Also all include memory in picture processing chip and subregion backlight value control unit that the embodiment of the present application provides,
Or register, for storing the information such as characteristic value, backlight value, DMA hardware parameter.
The embodiment of the present application additionally provides a kind of computer-readable storage medium, for storing one kind point of above-described embodiment offer
Computer software instructions used in area's method for controlling backlight thereof, it, which is included, is used to perform the program designed by above method embodiment.
By the program for performing storage, it is possible to achieve the upgrading and change of subregion backlight.
Although combining each embodiment herein, invention has been described, however, implementing the present invention for required protection
During, those skilled in the art are by checking the accompanying drawing, disclosure and appended claims, it will be appreciated that and it is real
Other changes of the existing open embodiment.In the claims, the word of " comprising " (comprising) one is not excluded for other compositions
Part or step, "a" or "an" are not excluded for multiple situations.Single processor or other units can realize claim
In some functions enumerating.Mutually different has been recited in mutually different dependent some measures, it is not intended that these are arranged
Apply to combine and produce good effect.
Those skilled in the art will readily occur to the present invention its after considering specification and putting into practice invention disclosed herein
Its embodiment.The application be intended to the present invention any modification, purposes or adaptations, these modifications, purposes or
Person's adaptations follow the general principle of the present invention and including the undocumented common knowledges in the art of the disclosure
Or conventional techniques.Description and embodiments are considered only as exemplary, and true scope and spirit of the invention are by following
Claim is pointed out.
It should be appreciated that the invention is not limited in the precision architecture for being described above and being shown in the drawings, and
And various modifications and changes can be being carried out without departing from the scope.The scope of the present invention is only limited by appended claim.
Claims (10)
1. a kind of subregion method for controlling backlight thereof, applied to picture processing chip, it is characterised in that described image process chip includes
Subregion backlight control unit, image compensation unit and direct memory access DMA unit, methods described include：
When the subregion backlight control unit obtains the characteristic value of each subregion, interrupt handling routine is called, at the interruption
Reason program includes：The algorithm of renewal, formula or driver；
Using the interrupt handling routine, according to the backlight value of each subregion of characteristic value calculating of each subregion；
The backlight value is transmitted to backlight driver by SPI signal to control the brightness of backlight, also, by the backlight
Value is sent to described image compensating unit by DMA unit so that described image compensating unit according to the backlight value to image
Rgb value compensate so that the brightness of the color of liquid crystal display and the backlight matches.
2. according to the method for claim 1, it is characterised in that if the characteristic value include each subregion in image most
Big value and average value, then the backlight value of each subregion is calculated according to the characteristic value of each subregion to be included：
Read group total is weighted to the average value in each subregion and maximum, obtains the backlight value of each subregion.
3. according to the method for claim 2, it is characterised in that if in the interrupt handling routine being smoothing processing journey
Sequence, then methods described also include：
Space smoothing processing is done to the backlight value of each subregion using the smoothing processing program, and, use the smooth place
Reason program does time smoothing processing to the backlight value of each subregion.
4. according to the method described in claim any one of 1-3, it is characterised in that scheme when the subregion backlight control unit obtains
As the characteristic value for each subregion that process chip counts also includes afterwards：
Described image process chip triggers the hard break signal of the subregion backlight control unit, makes the subregion backlight control list
Member prepares to handle the characteristic value；
The interrupt handling routine for needing to call according to the selection of the species of hard break signal.
5. according to the method described in claim any one of 1-3, it is characterised in that methods described also includes：
Described image compensating unit receives the backlight value that the subregion backlight control unit is sent；
The penalty coefficient of image is calculated according to the backlight value；
The rgb value of described image is compensated according to the penalty coefficient, picture signal is generated after compensation, and described in output
Picture signal.
6. a kind of picture processing chip, it is characterised in that described image process chip includes：Image statisticses unit, subregion backlight
Control unit, image compensation unit and DMA unit,
Described image statistic unit, for the characteristic value of each subregion in statistical picture, and by the DMA unit by the spy
Value indicative is sent to the subregion backlight control unit；
The subregion backlight control unit, for when receiving the characteristic value, calling interrupt handling routine；And described in use
Interrupt handling routine, the backlight value of each subregion is calculated according to the characteristic value of each subregion；And the backlight value is led to
Cross DMA unit and be sent to described image compensating unit, the interrupt handling routine includes：The algorithm of renewal, formula or driving
Program；
Described image compensating unit, for receiving the backlight value by the DMA unit, according to the backlight value to image
Rgb value compensates, output image signal after compensation.
7. chip according to claim 6, it is characterised in that the subregion backlight control unit, be additionally operable to the back of the body
Light value is transmitted to backlight driver by SPI signal.
8. chip according to claim 6, it is characterised in that
The subregion backlight control unit, if including the maximum peace of image in each subregion specifically for the characteristic value
Average, then read group total is weighted to the average value in each subregion and maximum, obtains the backlight value of each subregion.
9. according to the chip described in claim any one of 6-8, it is characterised in that described image compensating unit is specifically used for,
Receive the backlight value that the subregion backlight control unit is sent；
The penalty coefficient of image is calculated according to the backlight value；
The rgb value of described image is compensated according to the penalty coefficient, picture signal is generated after compensation；
Export described image signal.
10. according to the chip described in claim any one of 6-8, it is characterised in that
The subregion backlight control unit, it is additionally operable to, when the DMA unit generates hard break signal, pass through the interrupt processing
Program sets DMA hardware parameter；
The DMA unit, it is additionally operable to the characteristic value of the statistics being sent to the subregion backlight control unit.
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