CN105632411A - LCD backlight adjustment control method and LCD backlight adjustment control device based on image load analysis - Google Patents

Abstract

The invention provides a LCD backlight adjustment control method based on image load analysis, wherein the LCD backlight adjustment control method is used for performing backlight adjustment on a displayed image in an LCD display device driving circuit. The LCD backlight adjustment control method is characterized by comprising the steps of a, performing load analysis on displaying input data which are received by the driving circuit for obtaining a load threshold DTH; and b, adjusting the displaying input data according to the load threshold DTH for obtaining corrected displaying data.

Description

The control method of a kind of LCD backlight adjustment based on picture load analysis and device

Technical field

The present invention relates to Display Technique field, in particular it relates to the backlight of a kind of LCD adjusts new method, the new method that especially a kind of LCD backlight analyzed based on picture load adjusts.

Background technology

Along with continuous progressive, the social development in epoch, people are for TV, mobile phone, the requirement of computer or other display equipment is also more and more higher, and especially the universal scope now for mobile terminal is increasing, and people generally require that one portable, light, environmental protection, energy-conservation equipment are carried with. So people abandon original heaviness gradually, the high CRT of power consumption shows, and it is progressively replaced by LCD, specifically, LCD Display Technique brings us following several benefits, first, display effect is good, healthy radiationless, highly stable picture can be shown, it is possible to achieve screen flicker free, it is possible to effectively reduce user and watch visual fatigue produced by screen for a long time attentively; Secondly, the power consumption of LCD display just corresponds to 1/3rd of regular display, and energy-conservation does not have noise, and long-time use does not have the sensation of roasting heat; Thirdly LCD is lightly ultra-thin, and the profile of liquid crystal display is very thin, compared with tradition sphere display, it is possible to save space up to 60%, and, it can be carried with a hands easily by weight less than 1/4th of regular display, adults; Finally, LCD can provide complete plane to show, liquid crystal display adopts state-of-the-art liquid crystal technology, it is possible to accomplishing real plane, the liquid crystal display area of 15 inches is equivalent to the display effect of 17-inch flat panel display. So, LCD Display Technique instead of CRT gradually and shows, becomes the most widely used a kind of lcd technology in existing market. Specifically, the critical piece of LCD is its liquid crystal board, liquid crystal board comprises two panels without soda-lime glass material (Substrates), one layer of liquid crystal of sandwich, when light beam is by this layer of liquid crystal, liquid crystal can side by side or in irregular twisted shapes, so liquid crystal is more like gate one by one, whether selecting light penetration, we could see deep mixed, in picturesque disorder image at screen.

In recent years along with the fast development of handheld device (such as mobile phone, panel computer), the demand of small-medium size screen is in continuous expansion, and battery storage capacitance and size can not meet existing demand, so the high power consumption of backlight becomes the big problem that manufacturer pays close attention to. For this problem, each big LCD drives Chevron Research Company (CRC) to be proposed when ensureing image displaying quality, the method reducing backlight illumination, thus reaching to save the purpose of power consumption. Such as it is applied to the mean value method of large-scale LCD, maximum value process, histogram method etc., but this kind of method or distortion relatively big (such as mean value method, maximum value process), hardware realizes complex, and chip occupying area is relatively big, or the power consumption that the power dissipation ratio of algorithm introduction is saved is also big.

The present invention is directed to the deficiencies in the prior art, propose a kind of new method that LCD backlight is adjusted, specifically, be a kind of LCD backlight adjustment analyzed based on picture load, effectively solve the technical barrier of backlight high power consumption, but will not make that display distortion is relatively big, make hardware very complicated, so, benefit of the invention is in that, under ensureing image display effect premise, hardware realizes simple, and chip occupying area is little, and lower power consumption is obvious.

Summary of the invention

A kind of hardware cannot being provided to realize for prior art simple, chip occupying area is little, the obvious defect of lower power consumption, it is an object of the invention to provide a kind of LCD backlight analyzed based on picture load and adjusts control method.

According to an aspect of the present invention, it is provided that a kind of LCD backlight analyzed based on picture load

Adjust control method, for display image is carried out backlight tune by LCD display drive circuit

Whole, it is characterised in that to include:

A. the display input data described drive circuit received carry out load analysis to obtain load threshold DTH;

B. it is adjusted obtaining correction video data to described display input data according to described load threshold DTH.

Preferably, described step b also comprises the steps:

B '. according to described load threshold DTH, described display input data are adjusted and described backlight illumination is adjusted, to obtain correction video data.

Preferably, the step carrying out load analysis in described step a comprises the steps:

DTH_n=DTH_n-1+ ��, wherein said �� is step factor.

According to another aspect of the present invention, described step factor �� is determined as follows:

-add up to obtain statistical result to described display input data;

-determine belonging to described statistical result because of subinterval;

-according to described because determining described step factor in subinterval.

Preferably, described step factor is with described because of subinterval one_to_one corresponding.

Preferably, the described step that described display input data are added up comprises the steps:

-described display input data are converted to intermediate data R, G, the B based on three primary colors;

-described intermediate data R, G, B carried out selection process, and therefrom select or calculate suitable value as described statistical result.

Preferably, the described step that described intermediate data R, G, B are carried out selection process comprise the steps in any one:

-select placed in the middle one of numerical value as described statistical result from described intermediate data R, G, B;

-by described intermediate data R, G, B weighted average, and using described weighted mean as described statistical result.

According to another aspect of the present invention, also provide for a kind of LCD backlight adjustment analyzed based on picture load and control device, for display image is carried out backlight adjustment by LCD display drive circuit, it is characterised in that including:

Load analysis device, it carries out load analysis to obtain load threshold DTH for the display input data that described drive circuit is received; And

Adjusting apparatus, it is for being adjusted obtaining correction video data to described display input data according to described load threshold DTH.

Preferably, described adjusting apparatus also includes: the first adjusting apparatus, and it is for being adjusted described display input data according to described load threshold DTH; And second adjusting apparatus, it is for being adjusted according to described backlight illumination.

The present invention carries out load analysis to obtain load threshold DTH by the display input data that described drive circuit is received, then it is adjusted obtaining correction video data to described display input data according to described load threshold DTH, adopt iterative algorithm, adjust view data and backlight illumination, thus reaching to save the purpose of power consumption, the present invention is analyzed by picture load, it is rapidly achieved expectation threshold value, it is achieved that image dynamic effect is good, hardware realizes the effects such as simple, area is little, dynamic power consumption saving about 20%.

Accompanying drawing explanation

With reference to the following drawings, the LCD backlight of picture load analysis being adjusted the detailed description that control method is made by reading, the other features, objects and advantages of the present invention will become more apparent upon:

Fig. 1 illustrates that the LCD backlight for picture load is analyzed provided by the invention adjusts the schematic diagram of control method according to a specific embodiment of the present invention.

Fig. 2 illustrates a specific embodiment according to the present invention, and the LCD backlight for picture load is analyzed provided by the invention adjusts the iterative formula schematic diagram that the load analysis step of control method adopts;

Fig. 3 illustrates a specific embodiment according to the present invention, the cut-away view that the load analysis controlling device that the LCD backlight for picture load is analyzed provided by the invention adjusts realizes;

Fig. 4 illustrates that the LCD backlight for picture load is analyzed provided by the invention adjusts the flow chart of control method according to a specific embodiment of the present invention;

Fig. 5 illustrates according to the second embodiment of the present invention, the flow chart of the acquisition for step factor �� provided by the invention;

Fig. 6 illustrates according to a specific embodiment of the present invention, original schematic diagram that described display input data are adjusted; And

Fig. 7 illustrates according to a specific embodiment of the present invention, according to schematic diagram after the described load threshold DTH improvement that described display input data are adjusted.

Detailed description of the invention

It will be appreciated by those skilled in the art that those skilled in the art can realize described change case in conjunction with prior art and above-described embodiment, do not repeat them here. Such change case has no effect on the flesh and blood of the present invention, does not repeat them here.

As it is shown in figure 1, according to a specific embodiment of the present invention, the LCD backlight for picture load is analyzed provided by the invention adjusts the schematic diagram of control method. First, view data first sends into load analysis module, obtains picture load threshold value DTH, then, adjusts view data and backlight illumination (PWM) respectively according to DTH, and the view data recently entered is shown on LCD display. Both effects can neutralize because of mutually compensating on LCD display, so human eye will not find obvious change. This figure is clear, and the complete LCD backlight that picture load is analyzed that reflects adjusts the structure principle chart of control method, and specific embodiment can be explained in being embodied as and arrive, and does not repeat them here.

As in figure 2 it is shown, according to the specific embodiment of the present invention, the LCD backlight for picture load is analyzed provided by the invention adjusts the iterative formula that the load analysis module of control method adopts. Described formula is mainly used for the load analysis module of specific embodiments of the invention, has carried out the analysis of datumization for obtaining step factor method. Further, the iterative formula that load analysis module adopts, the load threshold of this two field picture is based on what the load threshold of previous frame image obtained, and wherein �� is step factor, this factor realize with algorithm in the segment number i of division and size relevant. Not easily excessive or too small, to cross conference and cause the picture load threshold value that finally gives with to expect threshold deviation relatively big, too small meeting causes the increased frequency of iteration, if iterations is too many, then human eye can be appreciated that the process that image and backlight adjust. Specific embodiment can be explained in being embodied as and arrive, and does not repeat them here.

As it is shown on figure 3, according to the specific embodiment of the present invention, the LCD backlight for picture load is analyzed provided by the invention adjusts the cut-away view that the load analysis of control method realizes. Rgb image data is first added up, and the condition of statistical data is relevant with previous frame picture load threshold value, then judges the result N of statistics belongs to which interval delimited in advance, according to respective bins plus-minus ��, through successive ignition, will obtain the threshold value expected. Specific embodiment can be explained in being embodied as and arrive, and does not repeat them here.

Specifically, it will be appreciated by those skilled in the art that Fig. 4 illustrates that the LCD backlight for picture load is analyzed provided by the invention adjusts the flow chart of control method according to a specific embodiment of the present invention. In the detailed description of the invention shown in Fig. 4, described control method includes following flow process:

Step S100 is first carried out, and the display input data that described drive circuit is received carry out load analysis, obtain load threshold DTH by described load analysis.

It will be appreciated by those skilled in the art that this step in order that the load threshold DTH that load analysis obtain can be passed through, and and then adjusts input data and the backlight illumination of described display according to described load threshold DTH. The display input data that described drive circuit receives namely we the RGB three primary colors of ripe title, further, described three primary colors and red (Red), green (Green), blue (Blue), the wavelength that the eyes of people are according to the light seen identifies color. Most of color in visible spectrum can be mixed in different ratios by three kinds of basic coloured light, and the color relation of the basic coloured light of these three is red (Red), green (Green), blue (Blue) primaries. These three light mixes in the same scale and reaches certain intensity, just presents white (white light); If the intensity of three kinds of light is zero, it is simply that black (dark). Here it is additive process principle, additive process principle is widely used in the product of the active illuminating such as television set, monitor. So, we are by carrying out load analysis by described RGB three primary colors, it is possible to obtain described load threshold DTH, thus input data and backlight illumination to described display have controlled and adjusted, and then reflect different colors.

Further, in order to obtain load threshold DTH, skilled artisan understands that, described RGB must be carried out load analysis, and described load analysis also needs point following steps to carry out: first described display input data are added up to obtain statistical result, it is then determined that belonging to described statistical result because of subinterval, carry out additional calculation to obtain described step factor finally according to the described adjusted value corresponding because of subinterval and a upper step factor. The mode of described load analysis specifically can be set forth in specific embodiment shown in following Fig. 2, does not repeat them here.

Subsequently into step S101, according to described load threshold DTH, described display input data are adjusted. It will be appreciated by those skilled in the art that in the normal display process of LCD, be default to directly display described display input data, thus obtaining an image corresponding with described display input data. And this step in order that people can be made to see the image that backlight illumination is moderate on a display screen, therefore namely it is adjusted obtaining correction video data to described display input data, and process to show described revised image to described correction video data, so that the image of final display is more seen well-established.

In one preferably change case, described Fig. 6 and Fig. 7 is the curve chart that described display input data are adjusted, further, Fig. 6 is illustrated that the schematic diagram that described display input data are adjusted, as shown in Figure 6, described dotted line represents described input GTG and the corresponding relation of described output GTG, slope 45 degree. Formula: OUT=IN;

Described solid line represents the corresponding relation of described input GTG and the described output GTG remapped. Formula: OUT=IN* ��, �� represent slope; It will be appreciated by those skilled in the art that the described mode that described display input data are adjusted has the obvious disadvantage that: when input is more than DTH, output data become 255, saturated phenomenon occur.

Preferably, as it is shown in fig. 7, be the detailed description of the invention that uses of the present invention, described embodiment is to utilize low gray scale compensation high gray, specifically, and the mapping relations of input data and output data:

First paragraph:

OUT=IN* ��;

Second segment:

0UT=255-(255-IN) * ��; Wherein,

Then we enter step S102, according to described load threshold DTH, described backlight illumination are adjusted. Skilled artisan understands that, this step is preferably performed while above-mentioned steps S101, its purpose is to can after being adjusted for described display input data, can clearly see the picture that we see, image is cannot see without backlight, so it is can be brighter that backlight has lightened image, but adjusting too bright, image just on the contrary can be thin out. Preferably, in the present embodiment, the backlight illumination that we are described, have employed the Duty ratio control mode of PWM, described PWM, i.e. pulse width modulation, is the very effective technology of one utilizing the digital output of microprocessor that analog circuit is controlled, is widely used in from the many fields measuring, communicating power control and conversion.

More specifically, skilled artisan understands that, in the present embodiment, preferably by the process that described backlight illumination is adjusted that the dutycycle regulating PWM realizes, specifically, in one preferably change case, the physical brightness assuming described LCD actual displayed is L, data input is LCDIN, and backlight illumination is BL, then brightness display formula is:

L=LCD_IN*BL

LCD_IN=(x_out_ana)^gamma��x_out^gamma

Described x_out_ana refers to the simulation output of LCD drive circuit, and further, described x_out is the digital quantity of simulation output.

The display brightness of the LCD after CABC adjustment is L_CABC, input data are LCD_IN_CABC, backlight is BL_CABC, display brightness formula:

L_CABC=IN* �� * BL_CABC

LCD_IN_CABC=(x_out_ana_CABC)^gamma��x_out_CABC ^gamma

Due to CABC adjust after LCD display brightness and adjust before should be equal, so

L=L_CABC

$\frac{{\mathrm{BL}}_{\mathrm{CABC}}}{\mathrm{BL}}=\frac{\mathrm{LCD}\_\mathrm{IN}}{\mathrm{LCD}\_{\mathrm{IN}}_{\mathrm{CABC}}}={\left(\frac{x\_\mathrm{out}}{x\_{\mathrm{out}}_{\mathrm{CABC}}}\right)}^{\mathrm{gamma}}={\left(\frac{\mathrm{IN}}{\mathrm{IN}*\mathrm{\α}}\right)}^{\mathrm{gamma}}={\left(\frac{1}{\mathrm{\α}}\right)}^{\mathrm{gamma}}$

${\mathrm{BL}}_{\mathrm{CABC}}=\mathrm{BL}*{\left(\frac{1}{\mathrm{\α}}\right)}^{\mathrm{gamma}}$

Dutycycle after described cabc adjustment should be

Preferably, skilled artisan understands that, in a preferred embodiment, in order to enable to control described backlight illumination by described load threshold DTH, it is first necessary to obtain described load threshold DTH by load analysis, by described load threshold DTH, control the gradual change of output voltage, then pass through PWM technology, reach to control the purpose of backlight illumination. Skilled artisan understands that, in a preferred change case, use BOOST circuit can be adopted, control backlight illumination and have two kinds of methods: the first, by EN end: adjust the dutycycle of PWM, adjusting being turned on and off of circuit of BOOST, output voltage is after first-order filtering, voltage amplitude is changed accordingly, thus reaching to regulate the effect of brightness. The second, by FB end: adjust the dutycycle of PWM, then pass through first-order filtering circuit, obtain corresponding change in voltage (being set to Va), owing to the voltage of FB remains unchanged (being set to Vb), the input current of FB end extremely little (amplifier input). If the voltage on the feedback resistance of FB end is Vc. Then therefore can reach to be regulated by arranging divider resistance the purpose of Vc by Vb. Vb change causes the change of Vc, and the change of Vc causes the change of LED current, thus reaching to regulate the effect of LCD backlight brightness. It will be appreciated by those skilled in the art that the method for described control backlight illumination belongs to currently available technology, do not repeat them here.

Finally we enter step S103, it is thus achieved that revise video data.

Skilled artisan understands that, this step in order that the video data of described correction can be made to inform people by display screen, further, the display of the continuous alternating iteration of picture of multiframe is on a display screen, characteristic according to described persistence of vision, human eye demonstrates the effect of animation, thus reaching the final purpose of the present invention. Further, skilled artisan understands that, described being adjusted backlight illumination, carried out the correction data after data process, namely the correction data after above-mentioned steps S101, S102 process are taken as video data and show on described LCD, do not repeat them here.

In order to be able to obtain the video data revised, described step S100 to S102 should be completed, skilled artisan understands that, obtain the video data of described correction, be the process of a continuous iterative image, and the number of times of iteration is unsuitable excessive or too small, cross picture load threshold value that conference causes finally giving and expect that threshold deviation is bigger, too small meeting causes the increased frequency of iteration, if iterations is too many, then human eye can be appreciated that the process that image and backlight adjust.

As described in Figure 5, in a preferred change case, the control mode of the acquisition of described step factor ��, it is also divided into following 3 steps:

First, enter step S200, add up to obtain statistical result to described display input data.

It will be appreciated by those skilled in the art that the purpose of this step is that described display input data are carried out a kind of effective calculating, obtain an effective value N, determine which described step factor �� is in because of in subinterval by described virtual value N. The described a kind of synopsis about described value N Yu step factor �� referred to because of subinterval by calculating in a large number and adding up and draw. Further, before described display input data are added up by execution, described display input data to be converted to intermediate data R, G, the B based on three primary colors by us, the data of described display input are before adding up, it is one group of code or one group of data comprising color, we need intermediate data R, G, B of first described code data being converted to based on three primary colors, thus reaching the described purpose that described display input data are added up. Described three primary colors is to show with binary one group of data, and our final purpose be these three groups of data are become one there is uniqueness and operability be effectively worth N.

In a preferred change case, assume that trichromatic red, green, blue is the binary data of 8, it is red respectively: 01000010, green: 10000001, blue: 00010001, further, we can face toward three groups of data and effectively calculate, described three groups of data are become one group of data, and these group data have uniqueness, effectiveness. Such as, by described intermediate data R, G, B weighted average, and using described weighted mean as described statistical result. The weight ratio that described red, green, blue accounts in the described embodiment is percent 33.333, therefore each in these three groups of data is carried out additive operation, then divided by 3, draws 0.330.3300.33000.330.66. Then this is organized 8 bit binary data and calculates described value N by another kind of effective algorithm by again, and such as, this can be organized data and be equally divided into 2 groups by us, 2 groups of numerals is added, obtains 11. Described 11 is corresponding described because of a step factor �� value in subinterval.

In another preferably change case, we can select placed in the middle one of numerical value as described statistical result from described intermediate data R, G, B, it is assumed that trichromatic red, green, indigo plant is the binary data of 8, is red respectively: 01010110, green: 10110001, blue: 01010001, further, taking numerical value placed in the middle and obtain 01010001, described numerical value 01010001 placed in the middle is described value N, further, show that correspondence is described because of a step factor �� value in subinterval.

Skilled artisan understands that, the mode of described calculating virtual value N has a variety of, described determined by the mode of described calculating virtual value N because of the setting in subinterval, the described step factor �� obtained in the either step of step S200 to S202, purpose is to obtain revised video data, the mode of described calculating virtual value N and determine that planning is described because of the division in subinterval, simply relative, as long as can determine described because of the corresponding described calculated virtual value N in subinterval after a large amount of rule computings, the described mode determining virtual value N, the described mode determining planning factors interval is all reasonable.

Then, perform step S201, it is determined that belonging to described statistical result because of subinterval. skilled artisan understands that, determine belonging to described statistical result because of subinterval in order that judge that result N is before the interval N-1 of previous frame image place or after described previous frame image place interval N-1, interval according to described interval and previous frame image place, it can be seen that this use addition or subtraction are that previous frame image levels off to this two field picture on earth. the described synopsis referring to one group of step factor �� and the virtual value N drawn by a large amount of scientific algorithm and experiment because of subinterval, it it is the set of the step factor �� of corresponding described virtual value N, described because of in subinterval, any described virtual value N can a corresponding step factor ��, described because of subinterval not easily excessive or too small, cross picture load threshold value that conference causes finally giving and expect that threshold deviation is bigger, thus not reaching my expected effect, too small meeting causes the increased frequency of iteration, if iterations is too many, so human eye can perhaps it can be seen that the process that adjusts of image and backlight.

In a preferred change case, assume described because of subinterval be (0,255), the corresponding described interval value 50 of the virtual value that previous frame image statistics draws, and the corresponding described interval value 75 of virtual value that this two field picture statistics draws, and then, we can by additive operation make previous frame image level off to this two field picture change. It will be appreciated by those skilled in the art that described change case is that described change case has no effect on technical scheme in order to be able to be best understood from the simply example that described step is lifted.

Finally, step S202 is entered, according to described because determining described step factor in subinterval.

It will be appreciated by those skilled in the art that according to the described purpose determining described step factor because of subinterval it is obtain a step factor �� value that can level off to targets threshold, described step factor �� value changes along with the change of virtual value N.

Further, described statistical result is to be drawn based on described trichromatic efficient algorithm by described view data is carried out by the described display image of this frame, and the load threshold of this two field picture is based on what the load threshold of previous frame image obtained, i.e. DTHn=DTHn-1+ ��, described DTH refers to targets threshold, described �� is step-length because of *, therefore the step factor �� corresponding to described statistical result is a variable quantity leveling off to described target display image threshold value. Skilled artisan understands that, described step factor �� can present slope increasing or decreasing along with being incremented by of virtual value N, can also be curve, it is also possible to be there is no any relation with the incremental of virtual value N, but described step factor is with described because of subinterval one_to_one corresponding. Further, described display input data are not once just reached correction video data, but have passed through being gradually completing of a lot of frame, and simply human eye is difficult to see clearly, therefore described step factor �� can change along with the change of this two field picture. As in figure 2 it is shown, through repeatedly revising, DTHn-1 can trend towards DTHn gradually, and step factor �� i can level off to 0 gradually.

Being different from the picture of previous frame, further, frames different continuously, a lot of frames is superimposed, and is the formation of the animation that we are alleged. It will be appreciated by those skilled in the art that in the present invention, described frame, it is simply that the single width image frame of least unit in image animation, be equivalent to each lattice camera lens on cinematographic film. One frame is exactly a secondary static picture, and continuous print frame is formed for animation, such as TV image etc. We generally say frame number, briefly, it is simply that the frame number of the picture of transmission in 1 seconds. It can be appreciated that graphic process unit can refresh several times each second, represent typically by fps. Each frame is all static image, in extremely rapid succession show that frame just defines the illusion of motion, the persistence of vision that namely we say, the brightness sensation of human eye will not disappear immediately along with the disappearance of the brightness of object, display utilizes quick color to switch, can be that human eye feels a lot of non-existent color, thus improving the color representation of display. High frame per second can obtain animation more smooth, more true to nature. Frame number each second (fps), the more shown action will be more smooth.

In recent years along with the fast development of handheld device (such as mobile phone, panel computer), the demand of small-medium size screen is in continuous expansion, and battery storage capacitance and size can not meet existing demand, so the high power consumption of backlight becomes the big problem that manufacturer pays close attention to. For this problem, each big LCD drives Chevron Research Company (CRC) to be proposed when ensureing image displaying quality, the method reducing backlight illumination, thus reaching to save the purpose of power consumption. Such as it is applied to the mean value method of large-scale LCD, maximum value process, histogram method etc., but this kind of method or distortion relatively big (such as mean value method, maximum value process), hardware realizes complex, and chip occupying area is relatively big, or the power consumption that the power dissipation ratio of algorithm introduction is saved is also big.

This utility model solves its technical problem and be the technical scheme is that the employing iterative algorithm when load analysis, the calculating threshold value of this two field picture is based on the threshold value of previous frame image, because the still image reality on the seen display of people is also dynamic, display screen is in the state of constantly refreshing, and owing to the speed of response of human eye is slower, so its dynamic changing process of None-identified, if the data analysis according to present frame, select a suitable step-length, threshold value is made to trend towards expecting threshold value, will reach to expect that threshold value (arranges size cases according to step-length after several frames, required frame number has difference, the threshold value finally given also has certain error).

The beneficial effects of the utility model are, under ensureing image display effect premise, hardware realizes simple, and chip occupying area is little, and lower power consumption is obvious.

In above-mentioned Fig. 1, view data first sends into load analysis module, after obtaining picture load threshold value DTH, view data and backlight illumination (PWM) is adjusted respectively according to DTH, both effects can neutralize because of mutually compensating on LCD display, so human eye will not find obvious change.

Above-mentioned Fig. 2 is the iterative formula that load analysis module adopts, and the load threshold of this two field picture is based on what the load threshold of previous frame image obtained, and wherein �� is step factor, this factor realize with algorithm in the segment number i of division and size relevant. Not easily excessive or too small, to cross conference and cause the picture load threshold value that finally gives with to expect threshold deviation relatively big, too small meeting causes the increased frequency of iteration, if iterations is too many, then human eye can be appreciated that the process that image and backlight adjust.

Above-mentioned Fig. 3 realizes structure chart inside load analysis, view data is first added up, the condition of statistical data is relevant with previous frame picture load threshold value, judge the result N of statistics belongs to which interval delimited in advance again, according to respective bins plus-minus ��, through successive ignition, the threshold value expected will be obtained.

Further, it will be appreciated by those skilled in the art that in a preferred embodiment, it is provided that the new method that a kind of LCD backlight analyzed based on picture load adjusts; Described method includes: picture load analysis, view data extension and LCD backlight adjustment. It is characterized in that: picture load is analyzed method and be have employed iterative method. Specifically, above-mentioned load analysis method, it is characterized in that: the relation according to view data Yu previous frame brightness of image threshold value, adopt an enumerator, count corresponding information. More specifically, select suitable iteration step length according to statistical information, previous frame image threshold basis obtains this two field picture threshold value. Above-mentioned iteration step length is not easily excessive or too small, and too small meeting causes that iterations increases, and excessive there will be actually obtains threshold value and expect that threshold deviation is bigger.

Further, with reference to embodiment illustrated in fig. 1, in a preferred embodiment, the LCD backlight adjustment analyzed based on picture load provided by the present invention controls device, for display image is carried out backlight adjustment by LCD display drive circuit, comprising: load analysis device, it carries out load analysis to obtain load threshold DTH for the display input data that described drive circuit is received; And adjusting apparatus, it is for being adjusted obtaining correction video data to described display input data according to described load threshold DTH. And in a further advantageous embodiment, described adjusting apparatus also includes: the first adjusting apparatus, it is for being adjusted described display input data according to described load threshold DTH; And second adjusting apparatus, it is for being adjusted according to described backlight illumination. Further, it will be appreciated by those skilled in the art that and be referred to above-mentioned Fig. 1 to embodiment illustrated in fig. 5 to realize described control device, do not repeat them here.

This technical patent relates to the new method that a kind of LCD backlight analyzed based on picture load adjusts. It can quickly obtain the load threshold of this image according to the content of picture load, view data and backlight illumination is dynamically adjusted based on this threshold value, thus reaching to save the purpose of power consumption, the maximum benefit of the method is exactly that image dynamic effect is good, hardware realize simple, area is little, dynamic power consumption saves about 20%.

Above specific embodiments of the invention are described. It is to be appreciated that the invention is not limited in above-mentioned particular implementation, those skilled in the art can make various deformation or amendment within the scope of the claims, and this has no effect on the flesh and blood of the present invention.

Claims (9)

1. the LCD backlight analyzed based on picture load adjusts a control method, for display image being carried out backlight adjustment in LCD display drive circuit, it is characterised in that including:

A. the display input data described drive circuit received carry out load analysis to obtain load threshold DTH;

B. it is adjusted obtaining correction video data to described display input data according to described load threshold DTH.

2. control method according to claim 1, it is characterised in that described step b also comprises the steps:

B '. according to described load threshold DTH, described display input data are adjusted and described backlight illumination is adjusted, to obtain correction video data.

3. control method according to claim 1 and 2, it is characterised in that the step carrying out load analysis in described step a comprises the steps:

DTH_n=DTH_n-1+ ��, wherein said �� is step factor.

4. control method according to claim 3, it is characterised in that described step factor �� is determined as follows:

-add up to obtain statistical result to described display input data;

-determine belonging to described statistical result because of subinterval;

-according to described because determining described step factor in subinterval.

5. control method according to claim 4, it is characterised in that described step factor is with described because of subinterval one_to_one corresponding.

6. the control method according to claim 4 or 5, it is characterised in that the described step that described display input data are added up comprises the steps:

-described display input data are converted to intermediate data R, G, the B based on three primary colors;

-described intermediate data R, G, B carried out selection process, and therefrom select or calculate suitable value as described statistical result.

7. control method according to claim 6, it is characterised in that the described step that described intermediate data R, G, B are carried out selection process comprise the steps in any one:

-select placed in the middle one of numerical value as described statistical result from described intermediate data R, G, B;

-by described intermediate data R, G, B weighted average, and using described weighted mean as described statistical result.

8. the LCD backlight adjustment analyzed based on picture load controls a device, for display image being carried out backlight adjustment in LCD display drive circuit, it is characterised in that including:

Load analysis device, it carries out load analysis to obtain load threshold DTH for the display input data that described drive circuit is received;

Adjusting apparatus, it is for being adjusted obtaining correction video data to described display input data according to described load threshold DTH.

9. control device according to claim 8, it is characterised in that described adjusting apparatus also includes:

First adjusting apparatus, it is for being adjusted described display input data according to described load threshold DTH;

Second adjusting apparatus, it is for being adjusted according to described backlight illumination.