CN101414437B - Liquid crystal display method and liquid crystal display device - Google Patents
Liquid crystal display method and liquid crystal display device Download PDFInfo
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- CN101414437B CN101414437B CN2007101514799A CN200710151479A CN101414437B CN 101414437 B CN101414437 B CN 101414437B CN 2007101514799 A CN2007101514799 A CN 2007101514799A CN 200710151479 A CN200710151479 A CN 200710151479A CN 101414437 B CN101414437 B CN 101414437B
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Abstract
The invention provides an LCD method which can adjust the brightness of different regions of a backlight source according to display images. More specifically, the invention provides an LCD method, and the method comprises the following steps: receiving an image signal; analyzing the image signal; dividing the image according to the analysis result of the image signal, and dividing the images into at least two image partitions; dividing the backlight source according to the image division result, and dividing the backlight source into at least two backlight source partitions; adjusting the backlight source brightness of each backlight source partition; and adjusting the image signal of each image partition. In the LCD method, the image and the backlight source are divided according to the image signal, meanwhile, the brightness of the image and the backlight source at each partition is adjusted, which reduces the power consumption of the LCD, increases the contrast of the image signals, and improves the LCD effect.
Description
Technical field
The present invention relates to a kind of display packing and corresponding display device, particularly a kind of method and corresponding liquid crystal display device that is used for liquid crystal display.
Background technology
The liquid crystal display (LCD) of liquid crystal indicator (like LCD TV) itself is not luminous; But belong to the backlight display device; There is backlight behind at liquid crystal display, and liquid crystal indicator is to lean on evenly distributed tiny liquid crystal particle sends through " blocking-up " and " opening " backlight on the screen light to show or go back original picture.In the starting stage, as long as the LCD energized, backlight is just in work, even picture displayed is the black full picture of a width of cloth, backlight is also in work.That is to say that the backlight of LCD TV is forever luminous.Because the transmittance of liquid crystal is extremely low; Make the brightness of LCD TV reach the degree that is enough to perfect display frame; The brightness of backlight will be very high, so not only can shorten the serviceable life of the backlight of liquid crystal indicator, and make beholder's eyes become tired easily; And if reduce the brightness of backlight, then can reduce the contrast and the color saturation of institute's display image.
The U.S. discloses a kind of technical scheme that the brightness in LED-backlit district is adjusted at first to file US7113164; Though this technical scheme has solved the contrast of liquid crystal display and the problem of saturation degree to a certain extent; But still there is certain defective: because this technical scheme is changeless to the subregion of backlight; Can only adjust the brightness of the pixel of FX; And can not make corresponding adjustment according to the variation of different display frames, can not satisfy the Protean display requirement of image frame.
Summary of the invention
In order to solve the problem that prior art exists, the invention provides a kind of liquid crystal display method, can adjust the subregion of backlight according to the difference of display frame, thereby can adapt to the display requirement that image frame constantly changes.
Concrete, the invention provides a kind of liquid crystal display method, comprising:
Receive picture signal;
Picture signal is analyzed;
Analysis result according to picture signal is divided image, and image division is at least two picture portions;
The result divides backlight according to picture portion, and backlight is divided at least two backlight subregions;
Brightness to each backlight subregion is adjusted;
Picture signal to each picture portion is adjusted.
Further, the present invention also provides a kind of liquid crystal indicator, comprises image input interface, image processing apparatus, LCDs and backlight;
Said image processing apparatus comprises image analyzing unit, zoning unit, liquid crystal interface unit, backlight driver and central processing unit;
Said image input interface receives picture signal;
Said image analyzing unit is analyzed the picture signal that receives;
Said zoning unit is divided said picture signal according to the analysis result of image analyzing unit, and said picture signal is divided at least two picture portions; Result according to image division divides said backlight simultaneously, and backlight is divided at least two backlight subregions;
Said backlight driver is adjusted the brightness of each backlight subregion;
Said liquid crystal interface unit is adjusted the brightness of the picture signal of each subregion, and adjusted picture signal is delivered to said LCDs demonstration.
Liquid crystal display method of the present invention is divided image and backlight according to picture signal; Simultaneously each is adjusted through the brightness of divided image subregion and backlight subregion; Not only reduced the power consumption of liquid crystal display; And increased the contrast of picture signal, improved the effect of liquid crystal display.
Description of drawings
Shown in Figure 1 is the schematic diagram of first embodiment of the invention;
Shown in Figure 2 is the synoptic diagram of Flame Image Process of the graphics processing unit of Fig. 1;
Shown in Figure 3 is the schematic diagram of second embodiment of the invention;
Shown in Figure 4 is the schematic diagram of third embodiment of the invention;
Shown in Figure 5 is the schematic diagram of fourth embodiment of the invention;
Shown in Figure 6 is the schematic diagram of fifth embodiment of the invention.
Embodiment
In order to make those skilled in the art person understand the present invention better, and make above-mentioned purpose of the present invention, feature and advantage can be more obviously understandable, below in conjunction with accompanying drawing and embodiment the present invention is further described.
As shown in Figure 1; The liquid crystal indicator of first embodiment of the invention comprises image input interface 110, image processing apparatus 120, LCDs 130 and backlight 140, and image processing apparatus 120 comprises image analyzing unit 121, zoning unit 122, liquid crystal interface unit 123, backlight driver 124 and central processing unit 125.The image processing apparatus 120 here can be made up of a plurality of discrete devices, also can be integral structure, is integrated on the chip piece.The liquid crystal indicator here can be products such as LCD TV, LCD, palm PC, mobile phone.
The course of work of this device is following:
The rgb signal that image processing apparatus 120 receives has one the tunnel can be sent to image analyzing unit 121, is analyzed by 121 pairs of these rgb signals of image analyzing unit.Can carry out through several different methods picture signal analysis, can directly analyze, also can analyze the frequency field of picture signal to the spatial domain of picture signal.The for example directly brightness of computed image signal through such as means such as Fourier transform, Laplace transforms picture signal being analyzed, or is analyzed or the like the frequency spectrum of picture signal through additive method.
This sentences Luminance Analysis, and to be example describe the course of work of image analyzing unit 121.
The frame rgb signal that image analyzing unit 121 at first will receive converts the data-signal of yuv format into, and the purpose of image transitions is in order to extract the luminance signal of rgb signal the inside, so this process also can be replaced by the monochrome information of extracting rgb signal.YUV signal is a kind of picture signal form that is common in, and " Y " represents brightness, and what " U " and " V " represented then is colourity, and effect is to describe image color and saturation degree, is used for the color of specified pixel.Brightness can be created through the RGB input signal, and method is that the specific part with rgb signal is superimposed together.Colourity has then defined two aspects---the tone and the saturation degree of color, representes with Cr and Cb respectively.
Next image analyzing unit 121 is divided into several zonules with entire image; The zonule here can be rectangle, triangle, hexagon, rhombus, cruciform or other irregular figures, and the shape and the size of each zonule can be the same or different.For ensuing convenience of calculation, preferred, image analyzing unit 121 has become M equal-sized rectangular tiles with image segmentation; The M here is a natural number, and its value can confirm according to the size of picture signal, generally speaking; M is big more, and the effect of present embodiment can be good more; When rectangular tiles is enough little, little time the pixel, the value of M is maximum, and its maximal value is the quantity of the pixel that entire image comprised.For convenience, we with each rectangular tiles be labeled as m1, m2 ..., mM, shown in Fig. 2 (a).
Each rectangular tiles that is divided into all comprises the pixel of several images, and each pixel all has corresponding YUV information.Suppose to comprise in each rectangular tiles a pixel, then each rectangular tiles all comprises a Y component.Image analyzing unit 121 is analyzed through the Y component that each rectangular tiles is comprised, and then can calculate or count the monochrome information of each rectangle sub-district.For convenience, we with the monochrome information of each rectangular tiles be labeled as y1, y2 ..., yM.The monochrome information here can be the monochrome information or the like of difference or other of high-high brightness, mean flow rate, high-high brightness and the minimum brightness of each rectangle sub-district.The calculating of these monochrome informations and statistics can no longer specify through existing accomplished in many ways here.
The zoning ordinance here has multiple, can be pre-set rule, also can come dynamic definite according to picture signal.By contrast, it is more convenient to use pre-set rule treatments to get up, and dynamic zoning ordinance then more can embody characteristics of the present invention.Respectively it is described below.
When zoning unit 122 uses pre-set rule that image is divided; Suppose that preset rule is: divide with high-high brightness; High-high brightness is divided into 4 grades such as 0-63,64-127,128-191,192-255, the corresponding picture portion of each grade.Then the course of work of zoning unit 122 is following: zoning unit 122 at first receives the monochrome information of each rectangle sub-district.Then zoning unit 122 compares the high-high brightness of each rectangle sub-district and the brightness degree in the division rule: with synthetic first picture portion of the rectangle cell set of high-high brightness between 0-63, be designated as P1; With synthetic second picture portion of the rectangle cell set of high-high brightness between 64-127, be designated as P2; With synthetic the 3rd picture portion of the rectangle cell set of high-high brightness between 128-191, be designated as P3; With synthetic the 3rd picture portion of the rectangle cell set of high-high brightness between 192-255, be designated as P4.At last, zoning unit 122 sends the relevant information of P1, P2, P3 and P4 to central processing unit 125.
Divide different with the predefined division rule of use; When zoning unit 122 uses dynamic division rule that image is carried out subregion; Zoning unit 122 after the Luminance Analysis result who receives image analyzing unit 121, more than the step of a definite zoning ordinance.As a rule; Dynamically the difference of division rule and preset rule only is confirming of subregion threshold values; Be divided into example with high-high brightness equally; It is 4 basic intervals that equate with the full luminance area dividing that division rule in the last example uses 63,127 and 191 3 fixing threshold values, and dynamically division rule can be confirmed similar threshold values according to image itself.Be example to be divided into four subregions equally, a kind of method is to confirm three threshold values through the weighted mean brightness of calculating brightness histogram, and its process is following: the brightness histogram of computed image; Calculate this histogrammic weighted mean brightness, be designated as Ya1; Calculate the weighted mean brightness of the image of brightness between 0-Ya1, be designated as Ya2; Calculate the weighted mean brightness of the image of brightness between Ya1-255, be designated as Ya3.Three weighted mean brightness of calculating like this can be confirmed as three threshold values of dynamic division rule; Division rule then can be confirmed as: divide with high-high brightness; High-high brightness is divided into 4 grades such as 0-Ya2, Ya2-Ya1, Ya1-Ya3 and Ya3-255, the corresponding picture portion of each grade.Then zoning unit 122 compares the high-high brightness of each rectangle sub-district and the brightness degree in the division rule: respectively with synthetic four picture portions of the rectangle cell set of high-high brightness between 0-Ya2, Ya2-Ya1, Ya1-Ya3 and Ya3-255.
Because what histogram was represented is the statistical relationship between each brightness and its probability of occurrence, therefore will be more approaching through the size in the definite several intervals of the weighted mean brightness of compute histograms.For example for the darker image of whole image; Because the probability that its low-light level occurs is bigger; The zone of using above-mentioned preset rule to divide out, meeting the rectangle number of cells of high-high brightness between 0-63 and 64-127 will be many, and the area of corresponding P1 and P2 is bigger; Will be fewer and meet the rectangle number of cells of high-high brightness between 128-191,192-255, the area of corresponding P1 and P2 is less.Use the area of four picture portions that above-mentioned dynamic division rule divides then more approaching.
After image was divided, zoning unit 122 then can be divided backlight according to the result of picture portion, for convenience, we will cut apart good backlight subregion be labeled as B1, B2 ..., Bx (x representes the subregion number).Generally speaking, backlight subregion and picture portion are corresponding one by one, and division methods is identical, and for example B1 is all identical with shape, size, the position of P1.It is pointed out that the notion of cutting apart, dividing that the present invention mentions, being construed as only is that image or backlight have been carried out symbolistic division, and can not be interpreted as physically or the division on the circuit.
Being example with backlight subregion B1 below describes the course of work of central processing unit 125: the picture portion that backlight subregion B1 is corresponding is P1; Suppose that the image high-high brightness in the picture portion P1 is Lp1; And the high-high brightness of luminance signal is defined as Lmax, then can confirm a numerical value through the ratio that calculates Lp1 and Lmax, and this numerical value promptly can be used as the brightness normalization coefficient of backlight subregion B1; Be designated as u1, i.e. u1=Lp1/Lmax.Can find out that u1 is generally speaking less than 1.In order to embody effect of the present invention to greatest extent, the general value of Lmax is 255, and the calculating of brightness normalization coefficient also is not limited to this a kind of computing method.Calculate after the brightness normalization coefficient u1 of backlight subregion B1, central processing unit 125 then calculate B2, B3 ..., the brightness normalization coefficient of Bx, be designated as u2, u3 ..., ux.After calculating finished, central processing unit 125 sent the brightness normalization coefficient of each backlight subregion to backlight driver 124 and liquid crystal interface unit 123.
The brightness regulation rule that backlight driver 124 is confirmed according to central processing unit 125 produces the drive signal of each backlight subregion and gives said backlight 140.Different with common backlight driver; Because the brightness of common backlight can not be adjusted according to the difference of display frame; All can be operated in as the one of which under the high-high brightness, the drive signal to each backlight lamp tube of corresponding backlight Source drive is all identical.Backlight driver 124 of the present invention can send different drive signals for different backlights according to the difference of backlight subregion.
The brightness regulation rule that continues below to confirm with above-mentioned brightness normalization coefficient is that example is explained the course of work of backlight driver 124: backlight driver 124 is adjusted the drive signal of each backlight subregion according to the brightness normalization coefficient of each backlight subregion after receiving the brightness normalization coefficient of each backlight subregion.
With backlight subregion B1 is example, and backlight driver 124 confirms to the display brightness of backlight subregion B1 needs according to u1 at first that after the brightness normalization coefficient that receives backlight subregion B1 is u1 the display brightness that B1 needs is designated as Lb1.Brightness when supposing the backlight operate as normal is that Lb, normal working current are ib.Then backlight driver 124 is confirmed Lb1, i.e. Lb1=Lb * u1 through the product that calculates Lb and u1.After confirming the display brightness Lb1 that good B1 needs, next backlight driver 124 is adjusted the corresponding driving signal.Because the brightness of backlight is by the luminous flux decision of LED backlight, and LED luminous flux and its working current are linear, according to Lb1=Lb * u1, the working current that can be easy to draw the B1 correspondence should be ib * u1.If backlight driver 124 uses the PWM pulse width modulated signals that backlight is driven, then need adjust the dutycycle of corresponding pwm signal.The dutycycle of supposing the pwm signal that iB is corresponding is Db, and then backlight driver 124 is adjusted into Db * u1 with the dutycycle of the drive signal of backlight subregion B1.Then, backlight driver 124 with same method to B2, B3 ..., the drive signal of each subregion of Bx adjusts.At last, backlight driver 124 sends to backlight 140 with the adjusted drive signal of each subregion, the brightness of control backlight 140.
Said backlight 140 receives the drive signal after the adjustment, converts drive signal into LED backlight that corresponding drive current flows to corresponding backlight subregion.Because the drive signal that each backlight subregion is corresponding is different, the brightness of backlight 140 each subregions is also different accordingly.Because the brightness normalization coefficient is generally speaking less than 1 (being 1 to the maximum), the brightness Lb of the brightness of the backlight of each backlight subregion during all less than the backlight operate as normal, therefore, liquid crystal indicator of the present invention can effectively reduce the power consumption of backlight.
Owing to the brightness of backlight is adjusted,, must also be adjusted accordingly to picture signal itself for the original image of correct demonstration.The brightness regulation rule that liquid crystal interface unit 123 is confirmed according to subregion result and central processing unit 125 is adjusted picture signal itself.
The brightness regulation rule that continues below to confirm with above-mentioned brightness normalization coefficient is that example is explained the course of work of liquid crystal interface unit 123.With picture portion P1 is example; Because the brightness of the backlight subregion B1 that picture portion P1 is corresponding has been adjusted to Lb1 by original Lb; Lb1=Lb * u1, the brightness of B1 has become original u1 doubly, and the brightness of picture portion P1 need be divided by the image of correct this subregion of demonstration of u1 ability so.Liquid crystal interface unit 123 is adjusted the brightness of image of P1 in view of the above, and the brightness of all pixels in the picture portion P1 is obtained new monochrome information divided by u1.Then, liquid crystal interface unit 123 is also similarly adjusted the brightness of image of other each picture portions.At last, liquid crystal interface unit 123 converts adjusted picture signal to meet the LCDs interface specification signal, is sent to LCDs 130, is shown by LCDs 130.
Except the brightness of picture signal was adjusted, liquid crystal interface unit 123 can also carry out the colourity optimization process to the picture signal of each picture portion with reference to a configurable two-dimentional reference table.Generally speaking, the parameter values in the said configurable two-dimentional reference table is the experience ginseng value that obtains through a large amount of subjective evaluation and tests.
Can find out that from the computing method of above-mentioned brightness normalization coefficient because u1=Lp1/Lmax, the brightness of picture portion P1 is after divided by u1, its high-high brightness has become Lmax by original Lp1.Suppose that the original high-high brightness of picture portion P1 is 50, Lmax value 255, the brightness section of then adjusted picture portion P1 has become 0-255 by original 0-50, and the contrast of picture signal has increased significantly.This has just solved, and existing liquid crystal display contrast when low-light level is low, the shortcoming of level fuzzy.Except simple brightness to corresponding image performs mathematical calculations; The picture signal of picture portion is adjusted other several different methods in addition; For example the histogram-equalized image enhancement algorithms can effectively increase information content of image, more perfectly display image signals.
Need to prove that it is to accomplish synchronously that the said signal that drive signal is sent to backlight 140 and meets the LCDs interface specification is sent to LCDs 130.The just explanation for ease and it being defined according to its function of each functional unit in the image processing apparatus 120, in fact, these unit can only be included among a chip or the one section software program.Said backlight 140 also can be an ingredient of LCDs 130.
Shown in Figure 3 is the schematic diagram of second embodiment of the invention, different with Fig. 1, and the image processing apparatus 120 of the liquid crystal indicator of second embodiment also comprises a storer 126.Storer 126 is used for the data processed result of memory image treating apparatus 120 each unit, and like this, each unit of image processing apparatus 120 can be handled through calling the data of preserving in the storer 126 accordingly.
As shown in Figure 4, the schematic diagram of third embodiment of the invention is a kind of schematic diagram of liquid crystal display method.
Concrete, step 410 receives picture signal, and picture signal can be that digital signal also can be a simulating signal, if simulating signal, pass through analog to digital conversion is digital signal with analog signal conversion.
Step 440: the analytical approach and the analysis result that need according to step 230 are made up in a plurality of zonules carry out.Several above-mentioned brightness values can be divided into a plurality of grades, form several picture portions thereby the rectangular tiles of average brightness value within an interval is combined into a zone, and like this, the process of picture portion can be accomplished.Use fixing brightness value carry out grade classification implement fairly simple, but for most picture signal, this division methods is not best division methods.Preferably, more approaching for the quantity of the zonule that makes each grade, method of the present invention can be divided into groups to each zonule according to brightness histogram.The benefit of using brightness histogram to carry out subregion is, the picture signal of concentrating for brightness ratio (for example whole dark or integral body is brighter) can be told more level.
Step 460 is adjusted generally and can be accomplished through following steps the brightness of different backlight area backlights: the brightness normalization coefficient that calculates each backlight subregion; Generate and the corresponding drive signal of this brightness normalization coefficient.The calculating of brightness normalization coefficient has had illustrated in front, repeats no more here.Calculate after the brightness normalization coefficient, can generate a drive signal and can be a drive current, also can be a driving voltage for corresponding backlight source partition, this drive signal.With the drive current is example, and the size of current of the drive current of this moment equals the product of initial current and this brightness normalization coefficient, and said initial current refers to the maximum current of said backlight subregion work.The reduction of backlight driver electric current can effectively reduce the power consumption of liquid crystal indicator.
Step 470: the picture signal to each picture portion is adjusted.Because the brightness of step 260 pair backlight subregion is adjusted, and for the original image of correct demonstration, must adjust picture signal.Because the brightness of backlight subregion decreases, the brightness of image of corresponding picture portion must improve.The high-high brightness of supposing certain picture portion is 50, and adjusted high-high brightness is 255, and then the brightness section of this picture portion has become 0-255 by original 0-50, and the contrast of picture signal has increased significantly.This has just solved, and existing liquid crystal display contrast when low-light level is low, the shortcoming of level fuzzy.Except simple brightness to corresponding image performs mathematical calculations; The picture signal of picture portion is adjusted other several different methods in addition; For example the histogram-equalized image enhancement algorithms can effectively increase information content of image, more perfectly display image signals.
As shown in Figure 5, the schematic diagram of fourth embodiment of the invention is the schematic diagram of other a kind of liquid crystal display method.
Different with embodiment shown in Figure 4, step 520 that picture signal is converted into YUV signal that embodiment shown in Figure 5 is many.
Step 530,540,550,560 and 570 can be with reference to the correlation step among the figure 4; Different is; Owing to formerly picture signal has been carried out format conversion; YUV signal after the conversion has directly comprised the monochrome information of picture signal, and about relating in Luminance Analysis and the calculation process, the correlation step that these steps among this embodiment are compared Fig. 2 deals with more easy.
Also have a bit different with embodiment shown in Figure 4, except the brightness of picture signal is adjusted, more than the embodiment shown in Figure 5 the step 580 that the colourity of the YUV signal of each picture portion is optimized.The carrier chrominance signal of step 580 pair YUV signal is optimized, and with reference to a configurable two-dimentional reference table, said picture signal is carried out the colourity optimization process.Generally speaking, the parameter values in the said configurable two-dimentional reference table is the experience ginseng value that obtains through a large amount of subjective evaluation and tests.
As shown in Figure 6, the schematic diagram of fifth embodiment of the invention is the schematic diagram of another liquid crystal display method.
The liquid crystal display method of this embodiment uses the method for rim detection that image is analyzed, and according to the result of rim detection image is carried out subregion.Concrete, the liquid crystal display method of present embodiment comprises: step 620: picture signal is carried out rim detection; With step 630: according to edge detection results image is carried out subregion, image segmentation is become at least two picture portions.
The edge of image detection method has multiple, and classical rim detection is to be the basis with the original image, to gray transitionization in each its certain field of pixel investigation of image, utilizes contiguous single order in edge or second order directional derivative Changing Pattern to detect the edge.Edge detection method commonly used has: difference rim detection, gradient rim detection, Roberts edge detection operator, Sobel edge detection operator, Prewitt edge detection operator, Laplace edge detection operator etc.Step 620 can use wherein any algorithm to realize, is example with the difference rim detection, the first order derivative operator that utilizes the image pixel gray scale gray scale rapidly variation place obtain high value.It just represents " edge strength " of this point in certain any value, can thresholding be set to these values and from image, detect edge elements clearly.
Step 630 is connected to form an enclosed areas according to the result of rim detection with each edge elements, and this zone has just formed a subregion of image.Some the picture portion possible range that forms thus is very little, and for the convenience of handling, step 630 also can be provided with certain rule, will comprise the less picture portion of pixel and certain adjacent picture portion combination, forms a new picture portion.
Following steps 640,650,660 etc. can realize with reference to above-mentioned the whole bag of tricks.
Can find out that from top process this embodiment need not become several zonules with image segmentation, but directly according to the edge of image testing result image is divided, different on the implementation method that realizes picture portion.
It is to be noted; The explanation of above-mentioned embodiment about liquid crystal display method of the present invention only is that its necessary step is illustrated, and similar step of image being carried out use in the conventional image processings such as denoising also can be used among liquid crystal display method of the present invention.
More than combine preferred embodiment to describe liquid crystal display method provided by the invention and device; Being familiar with these those skilled in the art should not break away under spirit of the present invention and the principle; The present invention is carried out the change and the modification of equivalent purpose; This equivalence change with revise, all should be regarded as and be covered by among the protection domain that the present invention defines.
Claims (18)
1. liquid crystal display method comprises:
Receive picture signal;
Picture signal is analyzed;
Analysis result according to picture signal is divided image, and image division is at least two picture portions;
The result divides backlight according to image division, and backlight is divided at least two backlight subregions;
Calculate the brightness normalization coefficient of each picture portion according to the high-high brightness of each picture portion;
According to said brightness normalization coefficient the drive signal of each backlight subregion is adjusted;
According to said brightness normalization coefficient the picture signal of each picture portion is adjusted.
2. liquid crystal display method according to claim 1 is characterized in that:
Analyze the brightness of picture signal said picture signal analysis is comprised;
Said analysis result according to picture signal is divided the Luminance Analysis result who comprises according to picture signal to image and is divided.
3. liquid crystal display method according to claim 2 is characterized in that:
Said brightness to picture signal is analyzed and is comprised: image segmentation is become a plurality of zones, calculate each regional high-high brightness;
Said Luminance Analysis result according to picture signal divides and comprises that the zone that high-high brightness is suitable is combined into described picture portion.
4. liquid crystal display method according to claim 3 is characterized in that: saidly become a plurality of zones to comprise image segmentation image segmentation is become a plurality of equal-sized rectangular areas.
5. liquid crystal display method according to claim 2 is characterized in that:
Said brightness to picture signal is analyzed and is comprised: image segmentation is become a plurality of zones, calculate each regional mean flow rate;
Said Luminance Analysis result according to picture signal divides and comprises that the zone that mean flow rate is suitable is combined into described picture portion.
6. liquid crystal display method according to claim 1 is characterized in that:
Said picture signal analysis is comprised: picture signal is carried out rim detection;
Said analysis result according to picture signal is divided and comprised: the result according to rim detection carries out subregion to image.
7. according to the arbitrary described liquid crystal display method of claim 1-6, it is characterized in that: said liquid crystal display method also comprises: convert said picture signal to YUV signal.
8. liquid crystal display method according to claim 7 is characterized in that: said liquid crystal display method also comprises: said YUV signal is carried out the colourity optimization process.
9. according to the arbitrary described liquid crystal display method of claim 1-6, it is characterized in that: said brightness adjustment to each backlight subregion comprises:
Calculate the brightness normalization coefficient of each backlight subregion;
Generate and the corresponding drive signal of this brightness normalization coefficient.
10. liquid crystal display method according to claim 7 is characterized in that: said brightness adjustment to each backlight subregion comprises:
Calculate the brightness normalization coefficient of each backlight subregion;
Generate and the corresponding drive signal of this brightness normalization coefficient.
11. liquid crystal indicator; Comprise image input interface, image processing apparatus, LCDs and backlight, it is characterized in that: said image processing apparatus comprises image analyzing unit, zoning unit, liquid crystal interface unit, backlight driver and central processing unit;
Said image input interface receives picture signal;
Said image analyzing unit is analyzed picture signal;
Said zoning unit is divided said picture signal according to the analysis result of image analyzing unit, and said picture signal is divided at least two picture portions; Result according to image division divides said backlight, and backlight is divided at least two backlight subregions;
Said central processing unit calculates the brightness normalization coefficient of each picture portion according to the high-high brightness of each picture portion;
Said backlight driver is adjusted the drive signal of each backlight subregion according to said brightness normalization coefficient;
Said liquid crystal interface unit is adjusted the brightness of the picture signal of each picture portion according to said brightness normalization coefficient, and adjusted picture signal is delivered to said LCDs demonstration.
12. liquid crystal indicator according to claim 11 is characterized in that: said image analyzing unit carries out Luminance Analysis to said picture signal, and said zoning unit is divided said image according to the Luminance Analysis result of said image analyzing unit.
13. liquid crystal indicator according to claim 12 is characterized in that: said image analyzing unit becomes a plurality of zones with image segmentation, calculates each regional high-high brightness;
Said zoning unit is combined into described picture portion according to division rule with a plurality of zones.
14. liquid crystal indicator according to claim 13 is characterized in that: said division rule is to confirm the visual criteria for classifying according to the weighted mean brightness of the brightness histogram of said image.
15. liquid crystal indicator according to claim 11 is characterized in that:
Said central processing unit is confirmed the brightness regulation rule of each backlight subregion;
Said backlight driver is adjusted the brightness of said each backlight subregion according to said brightness regulation rule.
16. liquid crystal indicator according to claim 15 is characterized in that:
Said central processing unit calculates the brightness normalization coefficient of each subregion according to the high-high brightness of each picture portion;
Said backlight driver produces the drive signal of each subregion according to said brightness normalization coefficient;
Said liquid crystal interface unit is adjusted the brightness of the picture signal of each subregion according to said brightness normalization coefficient.
17. liquid crystal indicator according to claim 11 is characterized in that: said image analyzing unit converts said picture signal into YUV signal.
18. liquid crystal indicator according to claim 17 is characterized in that: said liquid crystal interface unit carries out the colourity optimization process to said YUV signal.
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