CN101826282A - Liquid crystal display device and processing method of digital image signal - Google Patents
Liquid crystal display device and processing method of digital image signal Download PDFInfo
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Abstract
The invention discloses a liquid crystal display device, which comprises a liquid crystal driver module, a backlight driver module, a liquid crystal panel and LED backlight, and is characterized in that the liquid crystal device also comprises an image signal receiver module, an image cache module, an image analysis module, a backlight brightness calculation module and a liquid crystal grayscale calculation module. The invention also discloses a processing method of the digital image signal. The invention adopts an entire screen backlight adjustment method with a liquid crystal grayscale compensation method to enable the backlight brightness to change according to the contents of the images, so that the power consumption can be reduced, the display contrast can be improved, and the effect of the display pictures can be ensured.
Description
Technical field
The present invention relates to field of liquid crystal display, in particular use the liquid crystal indicator of LED-backlit, and the digital image signal process aiming method.
Background technology
In display, cathode ray tube (CRT) was once once occupying the whole market, but because the restriction on its weight and volume can't be satisfied miniaturization of electronic products and light-weighted trend, the small and exquisite display device of a kind of volume of current needs substitutes CRT monitor.Afterwards along with research to display technique, LCD (LCD) is advantage such as little, in light weight and low-power consumption with its volume, can realize substituting the Presentation Function of CRT, along with further investigation to LCD, be widely used in the display terminals such as flat-panel monitor and PC, and market presents rising tendency year by year to the demand of LCD.
Because LCD is passive demonstration, itself is not irradiative, needs a back light unit and shines the LCD panel, comes display image by the light that sees through, so back light unit of LCD needs shows usefulness as its light source for image.
Present LCD is backlight to mainly contain two types of cold cathode fluorescent lamp (CCFL) and light emitting diodes (LED).
The CCFL main flow that once becoming backlight, with low cost with it, technology is simply praised highly.But its serviceable life is short, rapid wear, in brightness and color rendition, has inborn deficiency, be difficult to satisfy high-quality image display requirement, and CCFL contains the mercury metal huge to environmental hazard, put into effect many restrictions all over the world successively the product that contains mercury.LED-backlit is arisen at the historic moment for this reason.Relatively traditional C CFL is backlight, adopts LED to be LCD backlight, and the higher color expressive force of brightness is stronger, and its color rendition scope can reach 105% of NTSC, is much better than CCFL 70%～85% performance level backlight, accomplishes wide colour gamut easilier.Can reach 100,000 hours the serviceable life of LED in addition, be better than 80,000 hours of CCFL half bright state.And more simply saved the required inversion high-tension circuit of CCFL in circuit design, structure is simpler.Based on above plurality of advantages, make present LED replace CCFL gradually, be widely used in LCD backlight.
The liquid crystal indicator that a kind of LED-backlit occurred, backlight illumination is wherein fixed, and can not adjust according to the liquid crystal display content change.Even and liquid crystal is 0 o'clock in gray level, its transmissivity does not reach 0 yet.Therefore, always some light can see through liquid crystal (light leak), causes local not enough " secretly " that liquid crystal display picture should " secretly ", has reduced the demonstration contrast; Simultaneously, most of light of backlight is stopped by liquid crystal, has reduced utilization factor backlight, has produced extra energy consumption.
Engendered a kind of liquid crystal indicator that adopts the dynamic backlight technology, the dynamic backlight control technology has following several method:
Maximum value process: with the gray scale maximal value of a frame received image signal as adjusted value backlight.The shortcoming of the method is that Power Cutback is few to the noise sensitivity on the image.
Mean value method: with the average gray of a frame received image signal as adjusted value backlight.The shortcoming of the method is to darker image, and backlight illumination is low excessively, the details of loss image.
The IMF algorithm: this algorithm obtains adjusted value backlight by the IMF curve of the grey level histogram of computed image, and shortcoming is a calculation of complex, is unfavorable for realizing.
There is following problem in the algorithm that proposes among the patent US20080291153: 1, this algorithm is bigger at the processing average brightness, and the image that variance is less during as monochrome image, has low excessively problem backlight.For example for the pure white image, according to the algorithm of this patent, backlight have only 0.7; 2, the low grey part liquid crystal compensation of image is too much, and when causing showing darker image, the problem of dark picture areas burnt hair is more obvious.
Therefore, there is defective in prior art, needs to improve.
Summary of the invention
Technical matters to be solved by this invention is at the deficiencies in the prior art, a kind of liquid crystal indicator at first is provided, the liquid crystal indicator that provides a kind of LED of use can dynamically adjust according to the liquid crystal display content change as the brightness of backlight and this LED-backlit further is provided, digital image signal process aiming method in a kind of liquid crystal indicator also is provided at last.
Technical scheme of the present invention is as follows:
A kind of liquid crystal indicator, comprise liquid crystal driver module, backlight drive module, liquid crystal panel and LED-backlit, wherein, also comprise: picture signal receives module, image buffer storage module, image analysis module, backlight illumination computing module, liquid crystal greyscale computing module;
Described picture signal receives module and is connected with described image buffer storage module, described image analysis module respectively, is used for providing data image signal to described image buffer storage module and described image analysis module;
Described image buffer storage module also is connected with described liquid crystal greyscale computing module, is used for receiving and the described data image signal of buffer memory, offers described liquid crystal greyscale computing module and is used to adjust liquid crystal greyscale;
Described image analysis module also is connected with described liquid crystal greyscale computing module with described backlight illumination computing module respectively, be used to receive described data image signal, described data image signal is carried out analyzing and processing, obtain image brightness signal and mean value thereof and maximal value, and described mean value passed to described backlight illumination computing module, and described image brightness signal and described maximal value are passed to described liquid crystal greyscale computing module;
Described backlight illumination computing module also is connected with described liquid crystal greyscale computing module with described backlight drive module respectively, is used for according to described mean value, calculates backlight brightness values, sends to described backlight drive module and described liquid crystal greyscale computing module;
Described liquid crystal greyscale computing module is used for according to described image brightness signal, described maximal value and described backlight brightness values, calculates and adjusts back liquid crystal greyscale data, and described adjustment back liquid crystal greyscale data are sent to described liquid crystal driver module.
Described liquid crystal indicator, wherein, described image analysis module comprises the luminance signal computing unit, average calculation unit and maximum value calculation unit, described luminance signal computing unit is used to receive described data image signal, according to formula Y=0.299 * R+0.587 * G+0.114 * B computed image luminance signal, wherein Y is an image brightness signal, R, G, B is the original gradation data of described data image signal, described average calculation unit is connected with described luminance signal computing unit, be used to calculate the mean value Yavg of described image brightness signal, described maximum value calculation unit is connected with described luminance signal computing unit, is used to calculate the maximal value Ymax of described image brightness signal.
Described liquid crystal indicator, wherein, described image analysis module comprises luminance signal computing unit and the statistics with histogram unit that connects in turn, described luminance signal computing unit is used to receive described data image signal, according to formula Y=0.299 * R+0.587 * G+0.114 * B computed image luminance signal, wherein Y is an image brightness signal, R, G, B is the original gradation data of described data image signal, described statistics with histogram unit is used for image brightness signal Y is carried out statistics with histogram, described statistics with histogram unit also is connected with maximum value calculation unit with average calculation unit respectively, described average calculation unit is used for calculating according to the statistics of described statistics with histogram unit the mean value Yavg of described image brightness signal, and described maximum value calculation unit is used for calculating according to the statistics of described statistics with histogram unit the maximal value Ymax of described image brightness signal
Described liquid crystal indicator, wherein, described backlight illumination computing module comprises mean value comparing unit and the backlight illumination computing unit that connects in turn, described mean value comparing unit is used for the mean value Yavg and the size that pre-sets threshold value A 0 of movement images luminance signal, export first comparative result to described backlight illumination computing unit, described backlight illumination computing unit calculates described backlight brightness values according to described first comparative result, wherein 0＜A0＜1.
Described liquid crystal indicator, wherein, described backlight illumination computing unit comprises that the comparative result that connects in turn receives subelement, algorithm chooser unit, described comparative result receives subelement and is used to receive described first comparative result, described algorithm chooser unit is used for pre-seting the described backlight brightness values BL of logical calculated according to described first comparative result and first, described first pre-sets logic is: if Yavg＜A0, then BL=k
1* Yavg+b
1If Yavg 〉=A0, then BL=k
2* Yavg+b
2Open and, BL=k
1* Yavg+b
1And BL=k
2* Yavg+b
2Intersect at the A0 place, wherein A0, k
1, k
2, b
1, b
2Span be 0＜A0＜1 ,-1＜k
1＜0,0＜k
2＜1,0＜b
1＜1,0＜b
2＜1.
Described liquid crystal indicator, wherein, described liquid crystal greyscale computing module comprises the minimum adjustment calculation unit that connects in turn, minimum liquid crystal adjusted value comparing unit, gain factor computing unit and grey scale signal computing unit, also comprise K value computing unit, described K value computing unit is connected with the gain factor computing unit with minimum adjustment calculation unit, described minimum adjustment calculation unit is used to receive the maximal value Ymax of described backlight brightness values BL and described image brightness signal, calculate minimum adjusted value Fmin according to formula F min=BL/Ymax, described K value computing unit is used for according to formula K=k
3* Fmin+b
3The calculating K value, wherein ,-1＜k
3＜0,0＜b
3＜1, described minimum liquid crystal adjusted value comparing unit is used for the size of the minimum adjusted value Fmin of comparison and 1, export second comparative result, described gain factor computing unit is used to receive image brightness signal Y, described K value and described second comparative result, pre-set logical calculated gain factor f according to second, described second pre-sets logic is: if F is min＜1, and gain factor so
If F were min 〉=1, gain factor f (i so, j)=1, wherein μ ∈ (0,1), σ ∈ (0,1), described grey scale signal computing unit is used to receive original gradation data R, G, the B of described gain factor f, described backlight brightness values BL and described data image signal, calculates according to formula Rnew=R * f/BL, Gnew=G * f/BL, Bnew=B * f/BL and adjusts back liquid crystal greyscale data Rnew, Gnew, Bnew.
A kind of data image signal disposal route that is applied to above-mentioned arbitrary liquid crystal indicator wherein, may further comprise the steps:
A1: the described data image signal of buffer memory;
A2: described data image signal is carried out analyzing and processing obtain image brightness signal and mean value and maximal value;
A3: according to described mean value, calculate backlight illumination, send to described backlight drive module;
A4: according to described image brightness signal, described maximal value and described backlight brightness values, calculate and adjust back liquid crystal greyscale data, send to described liquid crystal driver module.
Described method, wherein, described steps A 2 specifically may further comprise the steps:
A21: receive described data image signal, according to formula Y=0.299 * R+0.587 * G+0.114 * B computed image luminance signal, wherein Y is an image brightness signal;
A22: the mean value Yavg that calculates described image brightness signal;
A23: the maximal value Ymax that calculates described image brightness signal.
Described method, wherein, described steps A 2 specifically may further comprise the steps:
A21: receive described data image signal, according to formula Y=0.299 * R+0.587 * G+0.114 * B computed image luminance signal, wherein Y is an image brightness signal;
A22: image brightness signal Y is carried out statistics with histogram;
A23: the mean value Yavg that calculates described image brightness signal according to the statistics with histogram result;
A24: the maximal value Ymax that calculates described image brightness signal according to the statistics with histogram result.
Described method, wherein: the following operation of described steps A 3 concrete execution:
A31: the mean value Yavg of movement images luminance signal with pre-set the size of threshold value A 0, wherein 0＜A0＜1;
A32: import first comparative result to described backlight illumination computing unit;
A33: calculate described backlight brightness values according to described comparative result.
Described method, wherein, described steps A 33 specifically may further comprise the steps:
A331: receive described first comparative result;
A332: pre-set the described backlight brightness values BL of logical calculated according to described comparative result and first, described first pre-sets logic is: if Yavg＜A0, then BL=k
1* Yavg+b
1If Yavg 〉=A0, then BL=k
2* Yavg+b
2, and BL=k
1* Yavg+b
1And BL=k
2* Yavg+b
2Intersect A0, k at the A0 place
1, k
2, b
1, b
2Span be 0＜A0＜1 ,-1＜k
1＜0,0＜k
2＜1,0＜b
1＜1,0＜b
1＜1.
Described method, wherein, operation below described steps A 4 concrete the execution:
A41: receive the maximal value Ymax of described backlight brightness values BL and described image brightness signal, calculate minimum adjusted value Fmin according to formula F min=BL/Ymax;
A42: according to formula K=k
3* Fmin+b
3The calculating K value;
A43: more minimum adjusted value Fmin and 1 size, export second comparative result;
A44: receive image brightness signal Y, described K value and described second comparative result, pre-set logical calculated gain factor f according to second, described second pre-sets logic is: if Fmin＜1, gain factor so
If F is min 〉=and 1,
Gain factor f (i so, j)=1, wherein μ ∈ (0,1), σ ∈ (0,1), described grey scale signal computing unit is used to receive original gradation data R, G, the B of described gain factor f, described backlight brightness values BL and described data image signal, according to formula Rnew=R * f/BL, Gnew=G * f/BL, Bnew=B * f/BL calculate and adjust back liquid crystal greyscale data Rnew, Gnew, Bnew.
Backlight illumination computing method proposed by the invention have following beneficial effect:
1, the present invention is according to the average brightness Yavg of input picture, calculate backlight brightness values according to a refractive line equation, the backlight illumination computing method that patent US20080291153 proposed are to calculate backlight brightness values according to the average brightness Yavg of input picture and brightness variance Yvar;
2, the computing method of the backlight illumination that proposed of patent US20080291153 are when showing monochrome image, there is the low excessively problem of backlight illumination, there is not the low excessively problem of backlight illumination in the computing method of backlight illumination proposed by the invention, have enlarged the image range that is suitable for;
3, liquid crystal greyscale computing method proposed by the invention do not need low-pass filtering, and this has just reduced the easier hardware of complexity of calculation and has realized.The function of calculated gains factor f has the low middle high curvilinear function form in both sides;
4, the function of the calculated gains factor f that proposes among the patent US20080291153 is a refractive line equation that successively decreases.The problem that liquid crystal greyscale computing method proposed by the invention can avoid the low grey part liquid crystal compensation on the image too much to cause picture contrast to reduce.
Description of drawings
Fig. 1 is the structural representation of the embodiment of the invention 1;
Fig. 2 is the structural representation of the embodiment of the invention 2;
Fig. 3 is the structural representation of the embodiment of the invention 3;
Fig. 4 is the structural representation of the embodiment of the invention 4;
Fig. 5 is the structural representation of the embodiment of the invention 5;
Fig. 6 is the process flow diagram of the inventive method;
Embodiment
Below in conjunction with the drawings and specific embodiments, the present invention is described in detail.
Embodiment 1
Present embodiment provides a kind of liquid crystal indicator, as shown in Figure 1, comprise: liquid crystal driver module 15, backlight drive module 16, liquid crystal panel 18 and LED-backlit 17, picture signal receives module 10, image buffer storage module 11, image analysis module 12, backlight illumination computing module 13, liquid crystal greyscale computing module 15.Picture signal receives module 10 and is connected with image buffer storage module 11, image analysis module 12 respectively, is used for providing data image signal to image buffer storage module 11 and image analysis module 12; Image buffer storage module 11 is connected with liquid crystal greyscale computing module 14, is used for receiving and the buffer memory data image signal, and the brilliant gray scale computing module 14 of feed flow is adjusted liquid crystal greyscale and used; Image analysis module 12 is connected with backlight illumination computing module 13, be used to receive data image signal, data image signal is carried out analyzing and processing frame by frame, obtain the maximal value of the mean value and the image brightness signal of image brightness signal, image brightness signal, and the mean value of image brightness signal passed to the backlight illumination computing module, and the maximal value of image brightness signal and image brightness signal is passed to the liquid crystal greyscale computing module; Backlight illumination computing module 13 is connected with liquid crystal greyscale computing module 14 with backlight drive module 16 respectively, is used for the mean value according to image brightness signal, calculates backlight brightness values, sends to backlight drive module 16 and liquid crystal greyscale computing module 14; Liquid crystal greyscale computing module 14, be used for maximal value and backlight brightness values according to image brightness signal, image brightness signal, calculate and adjust back liquid crystal greyscale data, and the liquid crystal greyscale data send to liquid crystal driver module 15 after will adjusting, drive connected liquid crystal panel 18 by liquid crystal driver module 15, like this, present embodiment adopts the method for full frame dynamic control backlight, backlight illumination is changed according to image content, reduced power consumption.
Embodiment 2
On the basis of embodiment 1, as shown in Figure 2, preferably, present embodiment is provided with luminance signal computing unit 121 in described image analysis module, average calculation unit 124 and maximum value calculation unit 123, described luminance signal computing unit 121 is used to receive described data image signal, according to formula Y=0.299 * R+0.587 * G+0.114 * B computed image luminance signal, wherein Y is an image brightness signal, R, G, B is the original gradation data of described data image signal, described average calculation unit 124 is connected with described luminance signal computing unit 121, be used to calculate the mean value Yavg of described image brightness signal, described maximum value calculation unit 123 is connected with described luminance signal computing unit 121, is used to calculate the maximal value Ymax of described image brightness signal.
Embodiment 3
On the basis of embodiment 1, as shown in Figure 3, preferably, present embodiment further is provided with a histogram statistic unit 121 in image analysis module 12, its annexation is changed into: luminance signal computing unit 121 is connected in turn with statistics with histogram unit 122, luminance signal computing unit 121 is used to receive data image signal, according to formula Y=0.299 * R+0.587 * G+0.114 * B computed image luminance signal, wherein Y is an image brightness signal, R, G, B is the original gradation data of data image signal, statistics with histogram unit 122 is used for image brightness signal Y is carried out statistics with histogram, statistics with histogram unit 122 also is connected with maximum value calculation unit 123 with average calculation unit 124 respectively, average calculation unit 124 is used for the mean value Yavg according to the statistics computed image luminance signal of statistics with histogram unit 122, and maximum value calculation unit 123 is used for the maximal value Ymax according to the statistics computed image luminance signal of statistics with histogram unit 122.
Embodiment 4
Be applied to the various embodiments described above, as shown in Figure 4, preferably, present embodiment is provided with mean value comparing unit 131 and the backlight illumination computing unit 132 that connects in turn in backlight illumination computing module 13, mean value comparing unit 131 is used for the mean value Yavg and the size that pre-sets threshold value A 0 of movement images luminance signal, the luminance brightness that supports or opposes is calculated the unit and is exported first comparative result, and the backlight illumination computing unit calculates backlight brightness values according to comparative result.
Another example, backlight illumination computing unit 132 comprises that the comparative result that connects in turn receives subelement, algorithm chooser unit (not shown), comparative result receives subelement and is used to receive first comparative result, algorithm chooser unit is used for pre-seting logical calculated backlight brightness values BL according to comparative result and first, first pre-sets logic is: if Yavg＜A0, then BL=k
1* Yavg+b
1If Yavg 〉=A0, then BL=k
2* Yavg+b
2, and, BL=k
1* Yavg+b
1And BL=k
2* Yavg+b
2Intersect A0, k at the A0 place
1, k
2, b
1, b
2Span be 0＜A0＜1 ,-1＜k
1＜0,0＜k
2＜1,0＜b
1＜1,0＜b
2＜1.For example, in plane right-angle coordinate, BL=k
1* Yavg+b
1And BL=k
2* Yavg+b
2Intersect at the A0 place.
Embodiment 5
Be applied to the various embodiments described above, as shown in Figure 5, preferably, present embodiment comprises the minimum adjustment calculation unit 141 that connects in turn at liquid crystal greyscale computing module 14, minimum liquid crystal adjusted value comparing unit 142, gain factor computing unit 143 and grey scale signal computing unit 144, also comprise K value computing unit 140, K value computing unit 140 is connected with gain factor computing unit 142 with minimum adjustment calculation unit 141, minimum adjustment calculation unit 141 is used to receive the maximal value Ymax of backlight brightness values BL and image brightness signal, calculate minimum adjusted value Fmin according to formula F min=BL/Ymax, K value computing unit 140 is used for according to formula K=k3 * Fmin+b3 calculating K value, wherein the parameter value scope is :-1＜k3＜0,0＜b3＜1, minimum liquid crystal adjusted value comparing unit 142 is used for the size of the minimum adjusted value Fmin of comparison and 1, export second comparative result, gain factor computing unit 143 is used to receive image brightness signal Y, the K value and second comparative result, pre-set logical calculated gain factor f according to second, second pre-sets logic is: if Fmin＜1, gain factor so
If F min 〉=1, so gain factor f (i, j)=1, μ ∈ (0,1) wherein, σ ∈ (0,1).
Grey scale signal computing unit 144 is used for original gradation data R, G, the B of receiving gain factor f, backlight brightness values BL and data image signal, calculates according to formula Rnew=R * f/BL, Gnew=G * f/BL, Bnew=B * f/BL and adjusts back liquid crystal greyscale data Rnew, Gnew, Bnew.
Embodiment 6
Present embodiment provides a kind of data image signal disposal route that is applied to the various embodiments described above, and as shown in Figure 6, this method may further comprise the steps: A1: the buffer memory data image signal; A2: data image signal is carried out the maximal value that analyzing and processing obtains the mean value and the image brightness signal of image brightness signal, image brightness signal; A3: according to the mean value of image brightness signal, calculate backlight illumination, send to the backlight drive module; A4: according to the maximal value and the backlight brightness values of image brightness signal, image brightness signal, calculate and adjust back liquid crystal greyscale data, send to liquid crystal driver module.
Further preferred, steps A 2 specifically may further comprise the steps: A21: receive described data image signal, according to formula Y=0.299 * R+0.587 * G+0.114 * B computed image luminance signal, wherein Y is an image brightness signal; A22: the mean value Yavg that calculates described image brightness signal; A23: the maximal value Ymax that calculates described image brightness signal.
All right in addition, before above-mentioned steps A22, increase by a step: image brightness signal Y is carried out statistics with histogram, like this, steps A 2 specifically may further comprise the steps: A21: receive described data image signal, according to formula Y=0.299 * R+0.587 * G+0.114 * B computed image luminance signal, wherein Y is an image brightness signal; A22: image brightness signal Y is carried out statistics with histogram; A23: the mean value Yavg that calculates described image brightness signal according to the statistics with histogram result among the last step A22; A24: the maximal value Ymax that calculates described image brightness signal according to the statistics with histogram result among the last step A22.
Further preferred, steps A 3 concrete following operation: the A31 that carry out: the mean value Yavg of movement images luminance signal and the size that pre-sets threshold value A 0; A32: the luminance brightness that supports or opposes is calculated the unit and is exported first comparative result; A33: calculate backlight brightness values according to comparative result.Steps A 33 specifically may further comprise the steps: A331: receive first comparative result; A332: pre-set logical calculated backlight brightness values BL according to comparative result and first, first pre-sets logic is: if Yavg＜A0, then BL=k
1* Yavg+b
1If Yavg 〉=A0, then BL=k
2* Yavg+b
2, and BL=k
1* Yavg+b
1And BL=k
2* Yavg+b
2Intersect A0, k at the A0 place
1, k
2, b
1, b
2Span be 0＜A0＜1 ,-1＜k
1＜0,0＜k
2＜1,0＜b
1＜1,0＜b
2＜1.
Further preferred, steps A 4 concrete following operation: the A41 that carry out: receive the maximal value Ymax of backlight brightness values BL and image brightness signal, calculate minimum adjusted value Fmin according to formula F min=BL/Ymax; A42: according to publicity K=k
3* Fmin+b
3The calculating K value; A43: more minimum adjusted value Fmin and 1 size, export second comparative result; A44: receive image brightness signal Y, K value and second comparative result, pre-set logical calculated gain factor f according to second, second pre-sets logic is, if Fmin＜1, so
Wherein μ ∈ (0,1), σ ∈ (0,1), if F were min 〉=1, f (i so, j)=1, the grey scale signal computing unit is used for original gradation data R, G, the B of receiving gain factor f, backlight brightness values BL and data image signal, according to formula Rnew=R * f/BL, Gnew=G * f/BL, Bnew=B * f/BL calculate and adjust back liquid crystal greyscale data Rnew, Gnew, Bnew.
Below illustrate above-mentioned disposal route, with a frame resolution is that 1024 * 768 image is an example, the above-mentioned data image signal of buffer memory at first, this frame of digital picture signal is carried out analyzing and processing obtain image brightness signal Y, the mean value Yavg of image brightness signal is 0.3631, and the maximal value Ymax of image brightness signal is 1; According to the mean value of image brightness signal, calculate backlight illumination BL=0.6453, send to the backlight drive module; Maximal value Ymax and backlight brightness values BL according to image brightness signal Y, image brightness signal, calculate minimum adjusted value Fmin=0.6453 according to formula F min=BL/Ymax, determine that the K value is 0.1774, pre-set the gain factor f that logical calculated obtains each pixel correspondence of this two field picture according to second, table 1 is the gain factor f of preceding 20 * 4 pixel correspondences, calculate adjustment back liquid crystal greyscale data according to each gain factor f, send to liquid crystal driver module, finish the adjustment of liquid crystal greyscale.
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| ??0.771420207529244 | ??0.754912226019625 | ??0.752525932043833 | ??0.758487042270814 |
| ??0.77599751096158 | ??0.757296455260062 | ??0.752525932043833 | ??0.757296455260062 |
| ??0.780474449385246 | ??0.759676203297363 | ??0.752525932043833 | ??0.756104748655819 |
| ??0.78482967638911 | ??0.76323202669931 | ??0.752525932043833 | ??0.754912226019625 |
| ??0.789041866458821 | ??0.76558971250576 | ??0.752525932043833 | ??0.753719187965361 |
| ??0.791794572770104 | ??0.767584583858002 | ??0.752169150107709 | ??0.752169150107709 |
| ??0.794063036064003 | ??0.76792127614791 | ??0.752512806117484 | ??0.752169150107709 |
| ??0.805365595632474 | ??0.781156918776168 | ??0.734219542181174 | ??0.757554918273707 |
| ??0.803967004755621 | ??0.789974898804861 | ??0.746113560529181 | ??0.756842530524326 |
| ??0.794955933969412 | ??0.789974898804861 | ??0.758033580078702 | ??0.753264567099767 |
| ??0.795916911053141 | ??0.788945715866669 | ??0.76514151775644 | ??0.752071305791174 |
Table 1
Adopt said method processing digital images signal, full frame dynamic control backlight illumination makes backlight illumination change according to image content, because the dynamic change of backlight illumination does not need to continue the output constant luminance, thereby can reduce power consumption significantly.Liquid crystal greyscale is also adjusted according to the adjustment of backlight illumination simultaneously, thereby has guaranteed the effect of display frame.
Should be understood that, for those of ordinary skills, can be improved according to the above description or conversion, and all these improvement and conversion all should belong to the protection domain of claims of the present invention.
Claims (10)
1. liquid crystal indicator, comprise liquid crystal driver module, backlight drive module, liquid crystal panel and LED-backlit, it is characterized in that, also comprise: picture signal receives module, image buffer storage module, image analysis module, backlight illumination computing module, liquid crystal greyscale computing module;
Described picture signal receives module and is connected with described image buffer storage module, described image analysis module respectively, is used for providing data image signal to described image buffer storage module and described image analysis module;
Described image buffer storage module also is connected with described liquid crystal greyscale computing module, is used for receiving and the described data image signal of buffer memory, offers described liquid crystal greyscale computing module and is used to adjust liquid crystal greyscale;
Described image analysis module also is connected with described liquid crystal greyscale computing module with described backlight illumination computing module respectively, be used to receive described data image signal, described data image signal is carried out analyzing and processing, obtain image brightness signal and mean value thereof and maximal value, and described mean value passed to described backlight illumination computing module, and described image brightness signal and described maximal value are passed to described liquid crystal greyscale computing module;
Described backlight illumination computing module also is connected with described liquid crystal greyscale computing module with described backlight drive module respectively, is used for according to described mean value, calculates backlight brightness values, sends to described backlight drive module and described liquid crystal greyscale computing module;
Described liquid crystal greyscale computing module is used for according to described image brightness signal, described maximal value and described backlight brightness values, calculates and adjusts back liquid crystal greyscale data, and described adjustment back liquid crystal greyscale data are sent to described liquid crystal driver module.
2. liquid crystal indicator according to claim 1, it is characterized in that, described image analysis module comprises the luminance signal computing unit, average calculation unit and maximum value calculation unit, described luminance signal computing unit is used to receive described data image signal, according to formula Y=0.299 * R+0.587 * G+0.114 * B computed image luminance signal, wherein Y is an image brightness signal, R, G, B is the original gradation data of described data image signal, described average calculation unit is connected with described luminance signal computing unit, be used to calculate the mean value Yavg of described image brightness signal, described maximum value calculation unit is connected with described luminance signal computing unit, is used to calculate the maximal value Ymax of described image brightness signal.
3. liquid crystal indicator according to claim 1, it is characterized in that, described image analysis module comprises luminance signal computing unit and the statistics with histogram unit that connects in turn, described luminance signal computing unit is used to receive described data image signal, according to formula Y=0.299 * R+0.587 * G+0.114 * B computed image luminance signal, wherein Y is an image brightness signal, R, G, B is the original gradation data of described data image signal, described statistics with histogram unit is used for image brightness signal Y is carried out statistics with histogram, described statistics with histogram unit also is connected with maximum value calculation unit with average calculation unit respectively, described average calculation unit is used for calculating according to the statistics of described statistics with histogram unit the mean value Yavg of described image brightness signal, and described maximum value calculation unit is used for calculating according to the statistics of described statistics with histogram unit the maximal value Ymax of described image brightness signal.
4. liquid crystal indicator according to claim 1, it is characterized in that, described backlight illumination computing module comprises mean value comparing unit and the backlight illumination computing unit that connects in turn, described mean value comparing unit is used for the mean value Yavg and the size that pre-sets threshold value A 0 of movement images luminance signal, export first comparative result to described backlight illumination computing unit, described backlight illumination computing unit calculates described backlight brightness values according to described first comparative result, wherein 0＜A0＜1.For example, described backlight illumination computing unit comprises that the comparative result that connects in turn receives subelement, algorithm chooser unit, described comparative result receives subelement and is used to receive described first comparative result, described algorithm chooser unit is used for pre-seting the described backlight brightness values BL of logical calculated according to described first comparative result and first, described first pre-sets logic is: if Yavg＜A0, then BL=k
1* Yavg+b
1If Yavg 〉=A0, then BL=k
2* Yavg+b
2And, BL=k
1* Yavg+b
1And BL=k
2* Yavg+b
2Intersect at the A0 place, wherein A0, k
1, k
2, b
1, b
2Span be 0＜A0＜1 ,-1＜k
1＜0,0＜k
2＜1,0＜b
1＜1,0＜b
2＜1.
5. liquid crystal indicator according to claim 1, it is characterized in that, described liquid crystal greyscale computing module comprises the minimum adjustment calculation unit that connects in turn, minimum liquid crystal adjusted value comparing unit, gain factor computing unit and grey scale signal computing unit, also comprise K value computing unit, described K value computing unit is connected with the gain factor computing unit with minimum adjustment calculation unit, described minimum adjustment calculation unit is used to receive the maximal value Ymax of described backlight brightness values BL and described image brightness signal, calculate minimum adjusted value Fmin according to formula F min=BL/Ymax, described K value computing unit is used for according to formula K=k
3* Fmin+b
3The calculating K value, wherein ,-1＜k
3＜0,0＜b
3＜1, described minimum liquid crystal adjusted value comparing unit is used for the size of the minimum adjusted value Fmin of comparison and 1, export second comparative result, described gain factor computing unit is used to receive image brightness signal Y, described K value and described second comparative result, pre-set logical calculated gain factor f according to second, described second pre-sets logic is: if Fmin＜1, gain factor so
If Fmin 〉=1, gain factor f (i so, j)=1, wherein μ ∈ (0,1), σ ∈ (0,1), described grey scale signal computing unit is used to receive original gradation data R, G, the B of described gain factor f, described backlight brightness values BL and described data image signal, calculates according to formula Rnew=R * f/BL, Gnew=G * f/BL, Bnew=B * f/BL and adjusts back liquid crystal greyscale data Rnew, Gnew, Bnew.
6. a data image signal disposal route that is applied to the arbitrary liquid crystal indicator of claim 1 to 5 is characterized in that, may further comprise the steps:
A1: the described data image signal of buffer memory;
A2: described data image signal is carried out analyzing and processing obtain image brightness signal and mean value and maximal value;
A3: according to described mean value, calculate backlight illumination, send to described backlight drive module;
A4: according to described image brightness signal, described maximal value and described backlight brightness values, calculate and adjust back liquid crystal greyscale data, send to described liquid crystal driver module.
7. method according to claim 6 is characterized in that, described steps A 2 specifically may further comprise the steps:
A21: receive described data image signal, according to formula Y=0.299 * R+0.587 * G+0.114 * B computed image luminance signal, wherein Y is an image brightness signal;
A22: the mean value Yavg that calculates described image brightness signal;
A23: the maximal value Ymax that calculates described image brightness signal.
Perhaps, described steps A 2 specifically may further comprise the steps:
A21: receive described data image signal, according to formula Y=0.299 * R+0.587 * G+0.114 * B computed image luminance signal, wherein Y is an image brightness signal;
A22: image brightness signal Y is carried out statistics with histogram;
A23: the mean value Yavg that calculates described image brightness signal according to the statistics with histogram result;
A24: the maximal value Ymax that calculates described image brightness signal according to the statistics with histogram result.
8. method according to claim 6 is characterized in that: the following operation of described steps A 3 concrete execution:
A31: the mean value Yavg of movement images luminance signal with pre-set the size of threshold value A 0, wherein 0＜A0＜1;
A32: import first comparative result to described backlight illumination computing unit;
A33: calculate described backlight brightness values according to described comparative result.
9. method according to claim 8 is characterized in that, described steps A 33 specifically may further comprise the steps:
A331: receive described first comparative result;
A332: pre-set the described backlight brightness values BL of logical calculated according to described comparative result and first, described first pre-sets logic is: if Yavg＜A0, then BL=k
1* Yavg+b
1If Yavg 〉=A0, then BL=k
2* Yavg+b
2, and BL=k
1* Yavg+b
1And BL=k
2* Yavg+b
2Intersect A0, k at the A0 place
1, k
2, b
1, b
2Span be 0＜A0＜1 ,-1＜k
1＜0,0＜k
2＜1,0＜b
1＜1,0＜b
1＜1.
10. method according to claim 6 is characterized in that, operation below described steps A 4 concrete the execution:
A41: receive the maximal value Ymax of described backlight brightness values BL and described image brightness signal, calculate minimum adjusted value Fmin according to formula F min=BL/Ymax;
A42: according to formula K=k
3* Fmin+b
3The calculating K value;
A43: more minimum adjusted value Fmin and 1 size, export second comparative result;
A44: receive image brightness signal Y, described K value and described second comparative result, pre-set logical calculated gain factor f according to second, described second pre-sets logic is: if Fmin＜1, gain factor so
If Fmin 〉=1, gain factor f (i so, j)=1, μ ∈ (0,1) wherein, σ ∈ (0,1), described grey scale signal computing unit is used to receive original gradation data R, G, the B of described gain factor f, described backlight brightness values BL and described data image signal, according to formula Rnew=R * f/BL, Gnew=G * f/BL, Bnew=B * f/BL calculate and adjust back liquid crystal greyscale data Rnew, Gnew, Bnew.
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