CN103810980B - A kind of liquid crystal display method of reducing power consumption based on the image frequency of occurrences - Google Patents
A kind of liquid crystal display method of reducing power consumption based on the image frequency of occurrences Download PDFInfo
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Abstract
The invention discloses a kind of liquid crystal display method of reducing power consumption based on the image frequency of occurrences, wherein the present invention is directed to and histogram in buffer memory or the dissimilar image of previous frame image histogram, calculate gain coefficient α corresponding to this image, adopt the new gain coefficient α calculated to adjust respectively the light transmission rate of liquid crystal display and backlight light intensity; For the image similar to histogram in buffer memory or previous frame image histogram, the present invention then directly calls gain coefficient α corresponding to histogram similar image and adjusts respectively the light transmission rate of liquid crystal display and backlight light intensity.When the number of times that screen is lighted is the integral multiple of x, be the gain coefficient α of some images that the continuous frequency of occurrences is higher and their correspondences by buffer update; Present invention utilizes the backlight of the repeatability appearance of image and the locking screen interface of terminal and main screen change property adjustments liquid crystal display infrequently, greatly reduce the calculated amount of gain coefficient α, there is advantage low in energy consumption.
Description
Technical field
The present invention relates to a kind of method of reducing power consumption of liquid crystal display, particularly a kind of liquid crystal display method of reducing power consumption based on the image frequency of occurrences.
Background technology
Liquid crystal display (LiquidCrystalDisplay, LCD) as the low in energy consumption and display device of thin plane, used more and more widely, LCD TV from the hand-hold player of the small screen to giant-screen, computer monitor etc., liquid crystal display occupies more and more important position in the life of people.Along with the development of the communications industry, terminal with liquid crystal display is also comprehensively developed to speech, data, image, music and multimedia direction by originally single function, along with termination function from strength to strength, its power attenuation is also increasing, reduce the power consumption of liquid crystal display for economize energy, realize green society and have very important significance, the energy of therefore liquid crystal display consumption also more and more causes the concern of people.
In whole terminal, the power consumption of display module occupies ten to six 15 percent, and the power consumption of backlight occupies more than 60 percent of display module power consumption, therefore the efficiency improving backlight has sizable effect to improved system efficiency, effectively reduce the key that backlight power consumption is whole reduction power dissipation design, therefore reduction liquid crystal display power consumption method mainly concentrates on backlight module in the prior art, as by CCFL(ColdCathodeFluorescentLamp, cathode fluorescent tube) back light system is replaced with LED backlight system, or reduce power consumption by the brightness reducing backlight.LED backlight system declines relative to power consumption CCFL back light system to some extent as backlight, but its overall power consumption is still higher, and also improves production cost.And reduce this mode of power consumption by directly reducing back light source brightness, problem display effect having been brought not good when the degree reducing back light source brightness has been not sure.
Summary of the invention
The object of the invention is to overcome the shortcoming of prior art and deficiency, a kind of liquid crystal display method of reducing power consumption based on the image frequency of occurrences is provided, the method adjusts the brightness of backlight and the light transmission rate of liquid crystal display dynamically according to liquid crystal display epigraph content, after being lighted by each liquid crystal display equipment screen, the repeatability of some images occurs that this feature reduces unnecessary calculated amount, thus does not affect the display effect of liquid crystal display while reaching saving power consumption.
Object of the present invention is achieved through the following technical solutions: a kind of liquid crystal display method of reducing power consumption based on the image frequency of occurrences, comprises the following steps:
(1), after liquid crystal display equipment screen is lit, respectively histogram treatment is carried out to each two field picture of screen display, obtains the grey level histogram of multiple colour;
(2) after liquid crystal display equipment screen is lit at every turn, one is set for adding up the first counter of the continuous frequency of occurrences of similar image and the second counter for adding up dissimilar total number of images after previous screen point is bright; And make the first counter zone bit counter1 be a1, the second counter zone bit counter2 is b1; When each screen is lighted, detect in buffer memory whether have the histogram similar to the histogram of the first two field picture; Variance wherein between two two field picture corresponding pixel points is less than threshold value y, then judge that the histogram of two two field pictures is similar, otherwise be just judged as dissmilarity;
If so, the gain coefficient α then calling image that in current cache, histogram is similar with the first two field picture histogram corresponding adjusts respectively to the light transmission rate of liquid crystal display and backlight light intensity, then performs step (3);
If not, then accept image fault degree in scope according to present frame histogram, human eye and screen resolution calculates gain coefficient α corresponding to the first two field picture, and the gain coefficient α value of the histogram of buffer memory first two field picture and its correspondence, then adopts gain coefficient α to adjust respectively the light transmission rate of liquid crystal display and backlight light intensity; Then step (3) is performed;
(3) read next frame image histogram, contrast the image histogram of present frame read whether similar to the histogram of image in the histogram of previous frame image or buffer memory;
If, namely current frame image histogram is similar to the histogram of image in previous frame image histogram or buffer memory, then the first counter zone bit counter1 adds 1, and calls gain coefficient α corresponding to the histogram image similar with current frame image histogram and adjust respectively the light transmission rate of liquid crystal display and backlight light intensity; Then continue to perform step (3);
If not, namely in current frame image histogram and previous frame image histogram and buffer memory, image histogram is all dissimilar, then the second counter zone bit counter2 adds 1, and the first counter zone bit counter1 is set to a1; And accept image fault degree in scope according to the histogram of present frame, human eye and screen resolution calculates gain coefficient α corresponding to current frame image, and this gain coefficient α is adopted to adjust respectively the light transmission rate of liquid crystal display and backlight light intensity; Then step (4) is performed;
(4) judge whether the value of the second counter zone bit counter2 reaches by;
If not, then the histogram of buffer memory current frame image and the gain coefficient α value of correspondence thereof, then continues to perform step (3);
If so, step (5) is then performed;
(5) judge that whether number of times that this screen light is the integral multiple of x;
If so, calculate the continuous frequency of occurrences of each similar image according to the first counter zone bit counter1 value be set to before 1 in step (3), add up the p two field picture of the front p of continuous frequency of occurrences row, then perform step (6);
If not, then terminate to run, until continue after lighting screen to perform step (2) next time;
(6) whether judge that number of times lighted by this screen is x;
If, upgrade current cache, be the gain coefficient α value of histogram that before the continuous frequency of occurrences row of statistics in step (5), the p two field picture of p is corresponding and correspondence by current buffer update, then terminate to run, until continue execution step (2) after lighting screen next time;
If not, the p two field picture of p before the continuous frequency of occurrences rank of statistics in step (5) is lighted screen number of times for the continuous frequency of occurrences of the p two field picture stored during x integral multiple contrast with last, the p two field picture that the continuous frequency of occurrences comes front p name is selected from 2p two field picture, current cache is updated to the gain coefficient α of histogram corresponding to this p two field picture and correspondence, then terminate to run, until continue after lighting screen to perform step (2) next time.
Preferably, in described step (2), threshold value y is less than or equal to 0.15.
Preferably, carry out the histogram treatment of RGB in described step (1) for each two field picture, obtain the grey level histogram of RGB tri-colors.
Further, image fault degree in scope is accepted according to present frame RGB tri-Color Histogram, human eye and screen resolution calculates three Gray-scale value items in described step (2) and step (3), then choose maximum one as threshold value gray scale item Gthreshold, calculating gain coefficient α according to threshold value gray scale item Gthreshold is:
α=256/Gthreshold。
Further, described human eye accepts the image fault degree D=12.5% in scope, and the gray level of described RGB tri-Color Histogram is G
max=256; Described screen resolution is S=854*480.
Preferably, in described step (5), x is 20; Namely judge that whether number of times that this screen light is the integral multiple of 20 in described step (5);
Preferably, when in described step (2), each screen is lit, making the first counter zone bit counter1 be the 1, second counter zone bit counter2 is 1, described a1=1, b1=1.
Preferably, judge whether the value of the second counter zone bit counter2 reaches 11, i.e. by=11 in described step (4).
Preferably, in described step (5), p value is 5.
Preferably, when the screen number of times lighted is not the integral multiple of x, if when the histogram of image in the image histogram of the present frame read and the histogram of previous frame image and buffer memory is all dissimilar in described step (3), then now the gain coefficient α value of the histogram of current frame image and correspondence thereof is substituted image histogram when this screen stored in buffer memory is lighted and corresponding gain coefficient α thereof by step (4); When the screen number of times lighted is the integral multiple of x, if when the histogram of image in the image histogram of the present frame read and the histogram of previous frame image and buffer memory is all dissimilar in described step (3), then now step (4) the directly histogram of buffer memory current frame image and the gain coefficient α of correspondence thereof, image histogram when namely now not lighting this screen stored in buffer memory and corresponding gain coefficient α thereof substitute.
The present invention has following advantage and effect relative to prior art:
(1) the inventive method only calculates new gain coefficient α for histogram in buffer memory or the dissimilar image of previous frame image histogram, and adopts the new gain coefficient α calculated to adjust respectively the light transmission rate of liquid crystal display and backlight light intensity; For the current frame image similar to histogram in buffer memory or previous frame image histogram, the present invention directly calls gain coefficient α corresponding to the histogram image similar with current frame image histogram and adjusts respectively the light transmission rate of liquid crystal display and backlight light intensity.Therefore the repeatability that present invention utilizes image occurs the scheme of this adjustment of features LCD backlight greatly reducing the calculated amount of gain coefficient α, thus reaches the object reducing power consumption.The present invention is according to the general change such as the locking screen interface of terminal and main screen character infrequently in addition, lights number of times and just upgrades the gain coefficient α in buffer memory, therefore save calculated amount further every specific screen.
(2) the present invention adopts gain coefficient α to adjust respectively the light transmission rate of liquid crystal display and backlight light intensity, and reducing backlight illumination while α times, the light transmission rate for liquid crystal display strengthens, thus compensates brightness; Human eye receptible image fault degree scope in, certain multiple α is improved to each pixel of image, ensure that liquid crystal display device backlight lightness is when reducing α times, the picture quality of display remains unchanged substantially, namely ensures the display effect not affecting liquid crystal display while the inventive method reaches saving power consumption.Wherein gain coefficient α accepts image fault degree in scope according to present frame histogram, human eye and screen resolution calculates, and the display effect therefore further ensuring liquid crystal display can be received by human eye.
Accompanying drawing explanation
Fig. 1 is the process flow diagram of the inventive method.
Embodiment
Below in conjunction with embodiment and accompanying drawing, the present invention is described in further detail, but embodiments of the present invention are not limited thereto.
Embodiment
(1), after liquid crystal display equipment screen is lit, respectively RGB histogram treatment is carried out to each two field picture of screen display, obtains the grey level histogram of RGB tri-colors;
(2) after liquid crystal display equipment screen is lit at every turn, one is set for adding up the first counter of the continuous frequency of occurrences of similar image and the second counter for adding up dissimilar total number of images after previous screen point is bright; And making the first counter zone bit counter1 be the 1, second counter zone bit counter2 is 2; When each screen is lighted, detect in buffer memory whether have the histogram similar to the histogram of the first two field picture; Euclidean distance wherein in the present embodiment between two two field picture corresponding pixel points and variance are less than threshold value y=0.15, then judge that the histogram of two two field pictures is similar, otherwise be just judged as dissmilarity; In certain the present embodiment this threshold value y also can be less than 0.15 value;
If so, the gain coefficient α then calling image that in buffer memory, histogram is similar with the first two field picture histogram corresponding adjusts respectively to the light transmission rate of liquid crystal display and backlight light intensity, then performs step (3);
If not, then accept image fault degree in scope according to the first frame histogram, human eye and screen resolution calculates gain coefficient α corresponding to the first frame histogram, and the gain coefficient α value of the histogram of buffer memory first two field picture and correspondence thereof, adopts this gain coefficient α to adjust respectively the light transmission rate of liquid crystal display and backlight light intensity; Then step (3) is performed;
(3) read next frame image histogram, contrast the image histogram of present frame read whether similar to the histogram of image in the histogram of previous frame image or buffer memory;
If, namely current frame image histogram is similar to the histogram of image in previous frame image histogram or buffer memory, then the first counter zone bit counter1 adds 1, and calls gain coefficient α corresponding to the histogram image similar with current frame image histogram and adjust respectively the light transmission rate of liquid crystal display and backlight light intensity; Then continue to perform step (3);
If not, namely in current frame image histogram and previous frame image histogram and buffer memory, image histogram is all dissimilar, then the second counter zone bit counter2 adds 1, and the first counter zone bit counter1 is set to 1; And accept image fault degree in scope according to the histogram of present frame, human eye and screen resolution calculates gain coefficient α corresponding to current frame image, and this gain coefficient α is adopted to adjust respectively the light transmission rate of liquid crystal display and backlight light intensity; Then step (4) is performed;
(4) judge whether the value of the second counter zone bit counter2 reaches 11;
If not, then buffer memory current frame image histogram and and the gain coefficient α value of correspondence, then continue execution step (3);
If so, step (5) is then performed;
(5) judge that whether number of times that this screen light is the integral multiple of 20;
If so, calculate the frequency of occurrences of each similar image according to the first counter zone bit counter1 value be set to before 1 in step (3), add up 5 two field pictures of continuous frequency of occurrences row front 5, then perform step (6);
If not, then terminate to run, until continue after lighting screen to perform step (2) next time;
(6) whether judge that number of times lighted by this screen is 20;
If, upgrade current cache, be the gain coefficient α value of histogram that 5 two field pictures of the continuous frequency of occurrences row front 5 of statistics in step (5) are corresponding and their correspondences by current buffer update, then terminate to run, until continuation execution step (2) after lighting screen next time;
If not, by before the continuous frequency of occurrences rank of statistics in step (5) 55 two field pictures light screen number of times for the continuous frequency of occurrences of 5 two field pictures stored during x integral multiple contrast with last, select from 10 two field pictures 5 two field pictures that the continuous frequency of occurrences comes first 5, current cache is updated to the gain coefficient α value of histogram corresponding to this 5 two field picture and their correspondences; Then terminate to run, until continue after lighting screen to perform step (2) next time.
In the present embodiment when the screen number of times lighted is not the integral multiple of 20, if when the histogram of image in the image histogram of the present frame read and the histogram of previous frame image and buffer memory is all dissimilar in described step (3), then now the gain coefficient α value of the histogram of current frame image and correspondence thereof is substituted image histogram when screen is lighted in this time stored in buffer memory and corresponding gain coefficient α thereof by step (4); Make only to save in now buffer memory the histogram of current frame image and corresponding gain coefficient thereof and last 5 two field pictures stored when lighting the integral multiple that screen number of times is x, to save spatial cache.When the screen number of times lighted is the integral multiple of 20, if when the histogram of image in the image histogram of the present frame read and the histogram of previous frame image and buffer memory is all dissimilar in described step (3), then now step (4) the directly histogram of buffer memory current frame image and the gain coefficient α of correspondence thereof, image histogram when namely not lighting this screen stored in buffer memory and corresponding gain coefficient α thereof replace, for the gain coefficient α value of the histogram corresponding to the p two field picture finally counting the continuous frequency of occurrences and come front p name and correspondence.
Image fault degree in scope is accepted according to present frame RGB tri-Color Histogram, human eye and screen resolution calculates three Gray-scale value items in the present embodiment above-mentioned steps (2) and step (3), then choose maximum one as threshold value gray scale item Gthreshold, calculating gain coefficient α according to threshold value gray scale item Gthreshold is:
α=256/Gthreshold。
Wherein arrange the image fault degree D=12.5% that human eye accepts in scope in the present embodiment, the gray level of RGB tri-Color Histogram is Gmax=256; Described screen resolution is S=854*480.
Above-described embodiment is the present invention's preferably embodiment; but embodiments of the present invention are not restricted to the described embodiments; change, the modification done under other any does not deviate from Spirit Essence of the present invention and principle, substitute, combine, simplify; all should be the substitute mode of equivalence, be included within protection scope of the present invention.
Claims (10)
1., based on a liquid crystal display method of reducing power consumption for the image frequency of occurrences, it is characterized in that, comprise the following steps:
(1), after liquid crystal display equipment screen is lit, respectively histogram treatment is carried out to each two field picture of screen display, obtains the grey level histogram of multiple colour;
(2) after liquid crystal display equipment screen is lit at every turn, one is set for adding up the first counter of the continuous frequency of occurrences of similar image and the second counter for adding up dissimilar total number of images after previous screen point is bright; And make the first counter zone bit counter1 be a1, the second counter zone bit counter2 is b1; When each screen is lighted, detect in buffer memory whether have the histogram similar to the histogram of the first two field picture; Variance wherein between two two field picture corresponding pixel points is less than threshold value y, then judge that the histogram of two two field pictures is similar, otherwise be just judged as dissmilarity;
If so, the gain coefficient α then calling image that in current cache, histogram is similar with the first two field picture histogram corresponding adjusts respectively to the light transmission rate of liquid crystal display and backlight light intensity, then performs step (3);
If not, then accept image fault degree in scope according to present frame histogram, human eye and screen resolution calculates gain coefficient α corresponding to the first two field picture, and the gain coefficient α value of the histogram of buffer memory first two field picture and correspondence thereof, then adopts gain coefficient α to adjust respectively the light transmission rate of liquid crystal display and backlight light intensity; Then step (3) is performed;
(3) read next frame image histogram, contrast the image histogram of present frame read whether similar to the histogram of image in the histogram of previous frame image or buffer memory;
If, namely current frame image histogram is similar to the histogram of image in previous frame image histogram or buffer memory, then the first counter zone bit counter1 adds 1, and calls gain coefficient α corresponding to the histogram image similar with current frame image histogram and adjust respectively the light transmission rate of liquid crystal display and backlight light intensity; Then continue to perform step (3);
If not, namely in current frame image histogram and previous frame image histogram and buffer memory, image histogram is all dissimilar, then the second counter zone bit counter2 adds 1, and the first counter zone bit counter1 is set to a1; And accept image fault degree in scope according to the histogram of present frame, human eye and screen resolution calculates gain coefficient α corresponding to current frame image, and this gain coefficient α is adopted to adjust respectively the light transmission rate of liquid crystal display and backlight light intensity; Then step (4) is performed;
(4) judge whether the value of the second counter zone bit counter2 reaches by;
If not, then the histogram of buffer memory current frame image and the gain coefficient α value of correspondence thereof, then continues to perform step (3);
If so, step (5) is then performed;
(5) judge that whether number of times that this screen light is the integral multiple of x;
If so, calculate the continuous frequency of occurrences of each similar image according to the value before the first counter zone bit counter1 in step (3) is set to a1, add up the p two field picture of p before continuous frequency of occurrences row, then perform step (6);
If not, then terminate to run, until continue after lighting screen to perform step (2) next time;
(6) whether judge that number of times lighted by this screen is x;
If, upgrade current cache, be the gain coefficient α value of histogram that before the continuous frequency of occurrences row of statistics in step (5), the p two field picture of p is corresponding and correspondence by current buffer update, then terminate to run, until continue execution step (2) after lighting screen next time;
If not, the p two field picture of p before the continuous frequency of occurrences rank of statistics in step (5) is lighted screen number of times for the continuous frequency of occurrences of the p two field picture stored during x integral multiple contrast with last, the p two field picture that the continuous frequency of occurrences comes front p name is selected from 2p two field picture, current cache is updated to the gain coefficient α of histogram corresponding to this p two field picture and correspondence, then terminate to run, until continue after lighting screen to perform step (2) next time.
2. the liquid crystal display method of reducing power consumption based on the image frequency of occurrences according to claim 1, is characterized in that, in described step (2), threshold value y is less than or equal to 0.15.
3. the liquid crystal display method of reducing power consumption based on the image frequency of occurrences according to claim 1, is characterized in that, carries out the histogram treatment of RGB, obtain the grey level histogram of RGB tri-colors in described step (1) for each two field picture.
4. the liquid crystal display method of reducing power consumption based on the image frequency of occurrences according to claim 3, it is characterized in that, image fault degree in scope is accepted according to present frame RGB tri-Color Histogram, human eye and screen resolution calculates three Gray-scale value items in described step (2) and step (3), then choose maximum one as threshold value gray scale item Gthreshold, calculating gain coefficient α according to threshold value gray scale item Gthreshold is:
α＝256/Gthreshold。
5. the liquid crystal display method of reducing power consumption based on the image frequency of occurrences according to claim 3, is characterized in that, described human eye accepts the image fault degree D=12.5% in scope, and the gray level of described RGB tri-Color Histogram is G
max=256; Described screen resolution is S=854*480.
6. the liquid crystal display method of reducing power consumption based on the image frequency of occurrences according to claim 1, is characterized in that, in described step (5), x is 20.
7. the liquid crystal display method of reducing power consumption based on the image frequency of occurrences according to claim 1, it is characterized in that, when in described step (2), each screen is lit, the first counter zone bit counter1 is made to be 1, second counter zone bit counter2 is 1, described a1=1, b1=1.
8. the liquid crystal display method of reducing power consumption based on the image frequency of occurrences according to claim 1, is characterized in that, judges whether the value of the second counter zone bit counter2 reaches 11, i.e. by=11 in described step (4).
9. the liquid crystal display method of reducing power consumption based on the image frequency of occurrences according to claim 1, is characterized in that, in described step (5), p value is 5.
10. the liquid crystal display method of reducing power consumption based on the image frequency of occurrences according to claim 1, it is characterized in that, when the screen number of times lighted is not the integral multiple of x, if when the histogram of image in the image histogram of the present frame read and the histogram of previous frame image and buffer memory is all dissimilar in described step (3), then now the gain coefficient α value of the histogram of current frame image and correspondence thereof is substituted image histogram when this screen stored in buffer memory is lighted and corresponding gain coefficient α thereof by step (4); When the screen number of times lighted is the integral multiple of x, if when the histogram of image in the image histogram of the present frame read and the histogram of previous frame image and buffer memory is all dissimilar in described step (3), then now step (4) the directly histogram of buffer memory current frame image and the gain coefficient α of correspondence thereof, image histogram when namely now not lighting this screen stored in buffer memory and corresponding gain coefficient α thereof substitute.
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| WO2016093138A1 (en) * | 2014-12-08 | 2016-06-16 | シャープ株式会社 | Control device, display device, and control method for display device |
| JP6146594B1 (en) * | 2015-12-22 | 2017-06-14 | カシオ計算機株式会社 | Display device, control method therefor, and control program |
| CN108089688A (en) * | 2016-11-22 | 2018-05-29 | 中兴通讯股份有限公司 | A kind of control economize on electricity setting method, device and mobile terminal |
| WO2022006755A1 (en) * | 2020-07-07 | 2022-01-13 | 北京凯视达科技股份有限公司 | Display control device and method for obtaining light intensity distribution of backlight panel |
| CN115035865B (en) * | 2022-05-05 | 2024-05-17 | 石家庄市京华电子实业有限公司 | Light valve assembly partition dimming method based on LED backlight |
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