CN101630485A - Backlight driving method and device for digital display system - Google Patents
Backlight driving method and device for digital display system Download PDFInfo
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- CN101630485A CN101630485A CN200910090835A CN200910090835A CN101630485A CN 101630485 A CN101630485 A CN 101630485A CN 200910090835 A CN200910090835 A CN 200910090835A CN 200910090835 A CN200910090835 A CN 200910090835A CN 101630485 A CN101630485 A CN 101630485A
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Abstract
The invention provides a backlight driving method and a device for a digital display system, wherein, the method comprises the following steps: making the statistics of distribution density of pixels with brightness which is greater than a preset value in a video image, determining backlight brightness dimming proportion, slope of an ideal transfer function for image processing and a turning point of slope change, adjusting backlight according to the backlight brightness dimming proportion, making the statistics of distribution information of a brightness Y component of the video image, and amending the slope and the turning point of the ideal transfer function for image processing according to the distribution information, thereby improving the contrast of the video image. The backlight driving method and the device overcome the problems that when the prior art improves the backlight adjustment precision and reduces the brightness dynamic adjustment, the prior art causes flask risk, needs to increase the number of statistical segments of a histogram, leads the amount of statistical information data to be great, leads the complexity for amending the transfer function to be high and the like.
Description
Technical field
The present invention relates to digital demonstration field, in particular to a kind of backlight driving method and device that is used for digital display system.
Background technology
At present, flat panel TV, PC display, notebook computer, and other various terminal display spares (as MP3/MP4/PMP/PS2 etc.), can be according to the brightness degree of each two field picture, regulate backlight illumination adaptively, simultaneously correspondingly adjust view data, both can reach and reduce purpose backlight, as to save power consumption, can guarantee that again brightness of image and quality are unaffected.
Existing dynamic backlight driving method at first adopts the method for histogram (histogram) statistics, to the maximal value Max of each frame pixel RGB component (R, G, B) or luminance component Y carry out distribution statistics, as shown in Figure 1; Then, utilize the histogram statistical information, seek out the mean flow rate M of former frame image, the most frequent distribution value F or maximal value Max; Afterwards, adopt one of these three character numerical values, calculate slope and flex point thereof that backlight illumination is turned down ratio, Flame Image Process ideal transfer, as shown in Figure 2.Simultaneously, can utilize this histogram statistical information, revise the slope of transport function, to reach the purpose that improves contrast simultaneously at each statistical piece.
The inventor finds that prior art is to improve adjustment precision backlight, reduces the flicker risk that the luminance dynamic adjustment causes, and needs to increase the segments of histogram statistics, makes that the statistical information data amount is bigger, and the complexity of revising transport function is higher.
Summary of the invention
The present invention aims to provide a kind of backlight driving method and device that is used for digital display system, can solve prior art for improving adjustment precision backlight, reduce the flicker risk that the luminance dynamic adjustment causes, need to increase the segments of histogram statistics, make that the statistical information data amount is big, revise the problems such as complexity height of transport function.
In an embodiment of the present invention, provide a kind of backlight driving method that is used for digital display system, may further comprise the steps:
Brightness value is greater than the pixel of the preset value distribution density in different brightness section in the statistics video image;
Determine the ratio of turning down of backlight illumination, the slope of Flame Image Process ideal transfer and the flex point of slope variation according to distribution density;
Turning down ratio according to backlight illumination adjusts backlight;
The distributed intelligence of statistics video image brightness Y component;
According to distributed intelligence the slope and the flex point of Flame Image Process ideal transfer are revised to improve the contrast of video image.
In an embodiment of the present invention, also provide a kind of backlight drive device that is used for digital display system, having comprised:
First statistical module is used for adding up the video image brightness value greater than the pixel of the preset value distribution density in different brightness section;
The parameter determination module is used for determining the ratio of turning down of backlight illumination, the slope of Flame Image Process ideal transfer and the flex point of slope variation according to distribution density;
First adjusting module is used for turning down ratio according to backlight illumination and adjusts backlight;
Second statistical module is used to add up the distributed intelligence of video image brightness Y component;
Second adjusting module is used for according to distributed intelligence the slope and the flex point of Flame Image Process ideal transfer being revised to improve the contrast of video image.
In the above-described embodiments, by brightness in the statistics video image greater than the pixel of preset value distribution density in different brightness section, determine the ratio of turning down of backlight illumination according to distribution density, the slope of Flame Image Process ideal transfer and the flex point of slope variation, and then turn down ratio according to backlight illumination and adjust backlight, and the video image contrast is regulated according to the statistical information of brightness of image Y component, reduced the complexity of statistical information data amount and correction transport function, overcome in the prior art for improving adjustment precision backlight, reduce the flicker risk that the luminance dynamic adjustment causes, need to increase the segments of histogram statistics, make that the statistical information data amount is bigger, the complexity of revising transport function is than problems such as height.
Description of drawings
Accompanying drawing described herein is used to provide further understanding of the present invention, constitutes the application's a part, and illustrative examples of the present invention and explanation thereof are used to explain the present invention, do not constitute improper qualification of the present invention.In the accompanying drawings:
Fig. 1 shows histogram statistical method synoptic diagram in the prior art;
Fig. 2 shows slope and the flex point corresponding relation synoptic diagram thereof that backlight illumination in the prior art is turned down ratio, Flame Image Process ideal transfer;
Fig. 3 shows the backlight driving method process flow diagram that is used for digital display system according to an embodiment of the invention;
Fig. 4 shows distribution density statistical method synoptic diagram according to an embodiment of the invention;
Fig. 5 shows the backlight drive device that is used for digital display system according to an embodiment of the invention.
Embodiment
Below with reference to the accompanying drawings and in conjunction with the embodiments, describe the present invention in detail.
Fig. 3 shows the backlight driving method process flow diagram that is used for digital display system according to an embodiment of the invention, may further comprise the steps:
S302, brightness value is greater than the pixel of the preset value distribution density in different brightness section in the statistics video image;
S304 determines the ratio of turning down of backlight illumination, the slope of Flame Image Process ideal transfer and the flex point of slope variation according to distribution density;
S306 turns down ratio to backlight adjusting according to backlight illumination;
S308, the distributed intelligence of statistics video image brightness Y component;
S310 revises to improve the contrast of video image the Flame Image Process ideal transfer according to distributed intelligence.
In the present embodiment, by brightness in the statistics video image greater than the pixel of preset value distribution density in different brightness section, determine the ratio of turning down of backlight illumination according to distribution density, the slope of Flame Image Process ideal transfer and the flex point of slope variation, and then turn down ratio according to backlight illumination and adjust backlight, and the video image contrast is regulated according to the statistical information of brightness of image Y component, reduced the complexity of statistical information data amount and correction transport function, overcome and improved adjustment precision backlight in the prior art, reduce the flicker risk that the luminance dynamic adjustment causes, need to increase the segments of histogram statistics, make that the statistical information data amount is big, revise the problems such as complexity height of transport function.
Preferably, in above-mentioned dynamic backlight driving method, determine that according to distribution density the ratio of turning down of backlight illumination, the slope of Flame Image Process ideal transfer and the flex point of slope variation specifically comprise: the RGB component and the interval default luminance threshold of its corresponding bright level of pixel are compared; If one of RGB component, then increases the statistic (distribution density) of corresponding brightness level greater than the luminance threshold in its corresponding bright interval; After the one frame statistics, according to intensity level order from high to low, the distribution density of each intensity level is compared with the setting thresholding, surpass the gray scale of setting thresholding by first, can determine the ratio of turning down of backlight illumination, the slope of Flame Image Process ideal transfer and the flex point of slope correspondence.
Preferably, in above-mentioned dynamic backlight driving method, comprise that also the flex point of the ratio of turning down of backlight illumination, the slope of Flame Image Process ideal transfer and slope correspondence is a preset value when the distribution density of different intensity levels all is no more than the setting thresholding.
Preferably, in above-mentioned dynamic backlight driving method, the slope of Flame Image Process ideal transfer is the inverse that backlight illumination is turned down ratio, but flex point deducts a setting parameter x for the starting point that first surpasses the intensity level of setting thresholding, and the span of x is 0～64.
For example, in 8 systems, high-high brightness is 255, and setting preset value is 50%, add up for the pixel that is higher than high-high brightness 50%, and be 128 corresponding to 50% of high-high brightness.Be divided into 16 sections with 128～255 and add up (16 intensity levels).One of statistical pixel RGB component is greater than 128 count, and promptly distribution density obtains cnt_1; One of statistics RGB component obtains cnt_2 greater than 136 count; By that analogy, obtain 16 distribution densities, be different from traditional histogram, traditional statistical information is the counting of each brightness section, as 128～136 etc., as shown in Figure 1.And in an embodiment of the present invention, statistics be above the counting of certain brightness, as shown in Figure 4.Afterwards, statistical information by intensity level order from high to low, is judged that successively respectively whether value to determine backlight illumination turns down slope and the flex point thereof of ratio, Flame Image Process ideal transfer greater than setting thresholding thd.
In the above-described embodiments, when cnt_16＞thd, then to turn down ratio be 32/32=1 (no backlight turning down) to backlight illumination, and the slope of ideal transfer is 1, no flex point;
Otherwise, then cnt_15 is judged that if cnt_15＞thd, then to turn down ratio be 31/32 to backlight illumination, the slope of ideal transfer is 32/31; Flex point is 240-x, and the span of x is 0～64;
When cnt_16～cnt_1 all was no more than thd, the ratio of turning down backlight was a preset value.Be that backlight illumination is turned down ratio and is 50% (so, the highest 50% the range of decrease backlight that obtains, promptly energy-conservation 50%), data amplification is 2; Flex point is 120-x;
Preferably, in above-mentioned dynamic backlight driving method, preset value is 25%～75%.
Preferably, in above-mentioned dynamic backlight driving method, set threshold value and be 5%～30% of whole frame pixel count.
For improving picture contrast, can revise ideal transfer, need the distributed intelligence of statistics luminance Y component this moment.Distribution statistics to Y can be finished roughly, as to whole 0～255 brightness range, is divided into 8 or 16 sections and adds up.At this moment the method that just can adopt each common section to add up respectively generates histogram.About modification method to ideal transfer, its basic thought is: on the basis of ideal transfer, improve the slope of transport function in the high brightness range of distribution density, reduce the slope of transport function in the low brightness range of distribution density, can improve contrast with this.
For example, establish: flex point place Duan Weidi G section (total hop count is N), the master gain of ideal transfer (flex point is with the slope of lower part) is B1, according to Fig. 2, flex point is with the slope B2=(N-B1*G)/(N-G) on top.
The slope of following each section of flex point is adjusted as follows:
slope(i)＝B1*cof1(i)，i＝1～(G-1)
Wherein, every section adjustment coefficient: cof1 (i)=(G-1) * hist (i)/L_hist, L_hist be lower than flex point each section distribution density and.
The slope of flex point place section is: slope (G)=B1.
The slope of above each section of flex point is adjusted as follows:
slope(i)＝B2*cof2(i)，i＝(G+1)～N
Wherein, every section adjustment coefficient: cof2 (i)=(N-G) * hist (i)/H_hist, H_hist be higher than flex point each section distribution density and.
Fig. 5 shows the backlight drive device that is used for digital display system according to an embodiment of the invention, comprising:
First statistical module 10 is used for adding up the video image brightness value greater than the pixel of the preset value distribution density in different brightness section;
First adjusting module 30 is used for turning down ratio according to backlight illumination and adjusts backlight;
Second statistical module 40 is used to add up the distributed intelligence of video image brightness Y component;
In the present embodiment, by adopting first statistical module 10, brightness is greater than the pixel of the preset value distribution density in different brightness section in the statistics video image, in parameter determination module 20, determine the ratio of turning down of backlight illumination according to distribution density, the slope of Flame Image Process ideal transfer and the flex point of slope variation, and then in first adjusting module 30, backlight illumination is adjusted according to turning down ratio, and in second adjusting module 50, the video image contrast is regulated according to the statistical information of brightness of image Y component in second statistical module 40, reduced the complexity of statistical information data amount and correction transport function, overcome in the prior art for improving adjustment precision backlight, reduce the flicker risk that the luminance dynamic adjustment causes, need to increase the segments of histogram statistics, make that the statistical information data amount is big, revise the problems such as complexity height of transport function.
Obviously, those skilled in the art should be understood that, above-mentioned each module of the present invention or each step can realize with the general calculation device, they can concentrate on the single calculation element, perhaps be distributed on the network that a plurality of calculation element forms, alternatively, they can be realized with the executable program code of calculation element, carry out by calculation element thereby they can be stored in the memory storage, perhaps they are made into each integrated circuit modules respectively, perhaps a plurality of modules in them or step are made into the single integrated circuit module and realize.Like this, the present invention is not restricted to any specific hardware and software combination.
The above is the preferred embodiments of the present invention only, is not limited to the present invention, and for a person skilled in the art, the present invention can have various changes and variation.Within the spirit and principles in the present invention all, any modification of being done, be equal to replacement, improvement etc., all should be included within protection scope of the present invention.
Claims (8)
1. a backlight driving method that is used for digital display system is characterized in that, may further comprise the steps:
Brightness value is greater than the pixel of the preset value distribution density in different intensity levels in the statistics video image;
Determine the ratio of turning down of backlight illumination, the slope of Flame Image Process ideal transfer and the flex point of described slope variation according to described distribution density;
Turning down ratio according to described backlight illumination adjusts backlight;
Add up the distributed intelligence of described video image brightness Y component;
According to described distributed intelligence the slope and the described flex point of described Flame Image Process ideal transfer are revised to improve the contrast of described video image.
2. dynamic backlight driving method according to claim 1 is characterized in that, determines that according to described distribution density the ratio of turning down of backlight illumination, the slope of Flame Image Process ideal transfer and the flex point of described slope variation specifically comprise:
According to described intensity level order from high to low, the described distribution density of each described intensity level is compared with the setting thresholding, by first described intensity level that surpasses described setting thresholding, determine the ratio of turning down of backlight illumination, the slope of Flame Image Process ideal transfer and the flex point of described slope correspondence.
3. dynamic backlight driving method according to claim 2 is characterized in that, and is further comprising the steps of:
When the distribution density of described different brightness section all was no more than described setting threshold value, the ratio of turning down of described backlight illumination was a preset value.
4. dynamic backlight driving method according to claim 2, it is characterized in that, the slope of described Flame Image Process ideal transfer is the inverse of the ratio of turning down of described backlight illumination, and described flex point deducts a parameter preset for the starting point that first surpasses the described intensity level of described setting thresholding.
5. dynamic backlight driving method according to claim 4 is characterized in that, the span of described parameter preset is 0～64.
6. dynamic backlight driving method according to claim 3 is characterized in that, described preset value is 25%～75%.
7. dynamic backlight driving method according to claim 2 is characterized in that, described setting threshold value is 5%～30%.
8. a backlight drive device that is used for digital display system is characterized in that, comprising:
First statistical module is used for adding up the video image brightness value greater than the pixel of the preset value distribution density in different brightness section;
The parameter determination module is used for determining the ratio of turning down of described backlight illumination, the slope of Flame Image Process ideal transfer and the flex point of described slope variation according to described distribution density;
First adjusting module is used for turning down ratio to described backlight the adjustment according to described backlight illumination;
Second statistical module is used to add up the distributed intelligence of described video image brightness Y component;
Second adjusting module is used for according to described distributed intelligence the slope and the described flex point of described Flame Image Process ideal transfer being revised to improve the contrast of described video image.
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101778230A (en) * | 2010-03-19 | 2010-07-14 | 四川长虹电器股份有限公司 | Control method of liquid crystal display television automatic backlight adjusting speed |
| CN101877208A (en) * | 2010-06-29 | 2010-11-03 | 彩虹集团公司 | Control method of LED backlight |
| CN102842288A (en) * | 2011-06-21 | 2012-12-26 | 飞思卡尔半导体公司 | Backlight video display having dynamic brightness scale |
| CN107808649A (en) * | 2017-10-10 | 2018-03-16 | 惠科股份有限公司 | Display panel driving method and display device |
-
2009
- 2009-08-10 CN CN200910090835XA patent/CN101630485B/en active Active
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101778230A (en) * | 2010-03-19 | 2010-07-14 | 四川长虹电器股份有限公司 | Control method of liquid crystal display television automatic backlight adjusting speed |
| CN101877208A (en) * | 2010-06-29 | 2010-11-03 | 彩虹集团公司 | Control method of LED backlight |
| CN101877208B (en) * | 2010-06-29 | 2013-07-03 | 彩虹集团公司 | Control method of LED backlight |
| CN102842288A (en) * | 2011-06-21 | 2012-12-26 | 飞思卡尔半导体公司 | Backlight video display having dynamic brightness scale |
| CN102842288B (en) * | 2011-06-21 | 2017-03-01 | 飞思卡尔半导体公司 | There is the backlight video display of dynamic brightness scaling |
| CN107808649A (en) * | 2017-10-10 | 2018-03-16 | 惠科股份有限公司 | Display panel driving method and display device |
| CN107808649B (en) * | 2017-10-10 | 2019-07-12 | 惠科股份有限公司 | Display panel driving method and display device |
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| CN101630485B (en) | 2011-07-27 |
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