CN103177707B - Method for energy-saving displaying and relative device - Google Patents
Method for energy-saving displaying and relative device Download PDFInfo
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- CN103177707B CN103177707B CN201110441449.8A CN201110441449A CN103177707B CN 103177707 B CN103177707 B CN 103177707B CN 201110441449 A CN201110441449 A CN 201110441449A CN 103177707 B CN103177707 B CN 103177707B
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Abstract
The invention relates to a method for energy-saving displaying and a relative device. The method includes providing a representative data brightness according to a plurality of original data brightnesses of a plurality of pixels of a picture when the picture is displayed on a displayer, providing a target display brightness value for display characteristic of the displayer according to an original drive of a displayer light source and the representative data brightness and providing an energy-saving data brightness and an energy-saving drive for checking of a reference curve according to the target display brightness value to display the picture.
Description
Technical field
The present invention has a kind of method about energy-conservation display and relevant apparatus, and relates to especially and a kind ofly can take into account energy-conservation energy-saving displaying method with display image quality and relevant apparatus.
Background technology
The display that can present static state and/or dynamic image/picture has become one of most important interface of modern electronic product.Display contains screen, monitor, projector and TV etc., is widely used in mobile phone, various portable apparatus, computer and audio-visual electronic equipment.
Generally speaking, display shows a picture with a panel (such as liquid crystal panel) light source (back light of such as cathode-ray tube (CRT) or light emitting diode) of arranging in pairs or groups.Picture is made up of multiple pixel, these pixels corresponding, panel is provided with multiple pixel cell, each pixel cell controls the transparency (penetrance) of each pixel cell to this light source, the brightness presented with control panel (luma) according to a luminance data values of its respective pixel.For example, if the luminance data values being sent to a certain pixel cell is larger, the transparency of this pixel cell is higher, can through more light provided by this light source, to present higher brightness.The brightness that panel presents is directly related to the brightness that display presents.On the other hand, the brightness of light source is also determine one of display factor presenting brightness.For example, if the luminance data values of a pixel cell is fixed, then the brightness when light source is higher, and the brightness that this pixel cell presents also can be increased thereupon.In other words, the brightness that each pixel cell presents on display can depend on the brightness of luminance data values corresponding to each pixel cell and light source itself.
In the overall power of display, the power consumption of light source accounts for an important part.Therefore, if the power consumption of light source can be reduced, just effectively can reduce the overall power of display, reach the object of energy saving.
Summary of the invention
For reducing the power consumption of display, realize energy-conservation display technique, the present invention can luminance data values suitably corresponding to each pixel cell of gain, the brightness provided is minimized, reduces the power consumption of light source by this, and then the overall power of display is declined needed for light source.
In some applications, if the brightness of light source is too low, the Luminance Distribution of light source on panel can be affected, make Luminance Distribution uneven, cause light leakage phenomena; That is, when the brightness of light source is too low, have light source in the region of face plate edge and appear, make the brightness of diverse location on panel have obvious difference.Light leakage phenomena can reduce the image quality of picture display; But, the energy-conservation display technique of the present invention can propose solution to light leakage phenomena, to suppress light leakage phenomena on the impact of image quality, takes into account the demand of image quality and environmental protection and energy saving.
An object of the present invention is to provide a kind of method of energy-conservation display, is applied to a display; Display has a display characteristic, and a data luminance value and a motivation value are associated to a display brightness value (such as display brightness value) by it.And the inventive method comprises: provide a reference curve, each this display brightness value is associated to a reference data brightness value and a referenced drive value by it; An original motivation value of data luminance value and correspondence is represented, by checking out a target display brightness value in this display characteristic according to one of a picture; According to this target display brightness value, by checking out an Energy-saving Data brightness value and an energy-conservation motivation value in this reference curve; Further, according to the relation between this Energy-saving Data brightness value and this representative data brightness value, energy-conservation display is carried out for this picture.
In one embodiment, can maximal value in these raw data brightness values as this representative data brightness value.In another embodiment, when providing this representative data brightness value, comprising: carry out a Histogram statistics, these raw data brightness values are sequentially classified to multiple order group from high to low from large to small.Further, representing group by selecting preset number in these groups, respectively representing group's correspondence one and representing number; Wherein, by the highest this group of order to respectively this represent group the number of these raw data brightness values that adds up meet respectively that this represents corresponding this of group and represents number.Moreover, provide this representative data brightness value according to the highest this group of order to each these these raw data brightness values represented in group; For example, can according to the highest this group of order to respectively this represents the statistical property (as mean value or minimum value) of these raw data brightness values in group and for respectively this represents the accurate representative data brightness value that group provides a correspondence, and provides this representative data brightness value according to this preset number accurate representative data brightness value; Such as, this representative data brightness value can be provided according to the mean value of this preset number accurate representative data brightness value.
In one embodiment, the present invention can provide an intensity according to the number of these raw data brightness in each this group, and selects how to set this representative data brightness according to intensity.For example, if this intensity meets one concentrate condition, be then this representative data brightness value with the maximal value of these raw data brightness values; If this intensity does not meet this concentrated condition, be then this representative data brightness value to be less than a numerical value of the maximal value of these raw data brightness values, such as, say it is to provide this representative data brightness according to the accurate representative data brightness of aforesaid preset number.
When carrying out energy-conservation display for this picture, can comprise: provide a ratio according to the ratio between this energy-conservation luminance data values and this representative data brightness value, and according to the product of this ratio with each this raw data brightness value, this picture of confession carries out energy-conservation display.
In one embodiment, when making this display show this picture, this energy-conservation motivation value and is preset a difference of reducing motivation value and is provided one second energy-conservation motivation value.
Corresponding light leakage phenomena, the present invention can first provide one to face limit motivation value according to the light leak characteristic of this display, to face limit motivation value to provide this reference curve according to this.For example, if a upper limit luminance data values and this are faced and are limit motivation value to correspond to one to face and limit display brightness value by this display characteristic system, this reference curve then can be made to be associated to this upper limit luminance data values by being greater than this display brightness value of facing limit display brightness value, and to make this reference curve be associated to this face limit motivation value by being less than this display brightness value of facing limit display brightness value.
Reference curve can be continuous print, and it can make different Energy-saving Data brightness values can be associated to different display brightness values, maintains the bright blindstory of picture, to take into account energy-conservation and image quality.
Another object of the present invention is to provide a kind of device of energy-conservation display, be applied to a display, comprise one and represent data luminance module, a reference curve module, a target display brightness value module, an energy-conservation motivation value module, an Energy-saving Data brightness value module, a Nogata statistical module and an automatic mode control module.The original motivation value that representative data brightness module provides one to represent data luminance value and its correspondence.Reference curve module provides reference curve, so that each this display brightness value is associated to a reference data brightness value and a referenced drive value respectively.Target display brightness value module according to this original motivation value and this representative data brightness value, by checking out a target display brightness value in this display characteristic.Energy-conservation motivation value module can according to this target display brightness value by checking out a r Energy-saving Data brightness value and an energy-conservation motivation value in this reference curve.Energy-saving Data brightness value module then carries out energy-conservation display according to the relation between this Energy-saving Data brightness value and this representative data brightness value for this picture.
Histogram statistics module carries out a Histogram statistics, according to the size of these raw data brightness value luminance data values, these raw data brightness values is classified to multiple order group from high to low.Automatic mode control module provides an intensity according to the number of these raw data brightness in each this group.If intensity meets one concentrate condition, automatic mode control module makes representative data brightness module using the maximal value in raw data brightness value as this representative data brightness value raw data brightness data value raw data brightness representative data brightness; If intensity does not meet concentrated condition, then to be less than a numerical value of the maximal value of these raw data brightness values for this representative data brightness value representative data brightness raw data brightness data value raw data brightness.
For example, if intensity does not meet concentrated condition, representative data brightness module can be selected preset number and represent group in these groups; Further, representative data brightness module more according to the highest this group of order to the statistical property (as mean value or minimum value) of each raw data brightness represented in group for each group that represents provides representative data brightness value surely, and provide this representative data brightness value according to the mean value of this preset number accurate representative data brightness value.
Energy-saving Data brightness value module can provide a ratio according to the ratio of this energy-conservation luminance data values and this representative data brightness value, and according to the product of this ratio with each this raw data brightness value, carries out energy-conservation display for this picture.
In one embodiment, energy-conservation motivation value module is more preset a difference of reducing motivation value according to this energy-conservation motivation value and one and is provided one second energy-conservation motivation value, carries out energy-conservation display for this picture.
In one embodiment, this reference curve module more faces limit motivation value according to the light leak property settings one of display, and faces limit motivation value provide this reference curve according to this.For example, if this display characteristic a upper limit luminance data values and this is faced to limit motivation value to correspond to one to face and limit display brightness value, then this reference curve module makes this reference curve be associated to this upper limit luminance data values by being greater than this display brightness value of facing limit display brightness value, and is associated to this faces limit motivation value by being less than this display brightness value of facing limit display brightness value.
In order to have better understanding to above-mentioned and other aspect of the present invention, preferred embodiment cited below particularly, and coordinating accompanying drawing, being described in detail below:
Accompanying drawing explanation
What Fig. 1 illustrated is the embodiment implementing energy-conservation display technique in a display.
Fig. 2 signal be flow process according to one embodiment of the invention.
Fig. 3 signal be Histogram statistics according to one embodiment of the invention.
Fig. 4 signal be energy conservation priority pattern according to one embodiment of the invention.
What Fig. 5 illustrated is the example realizing energy-conservation display technique according to one embodiment of the invention.
Fig. 6 signal be reference curve according to one embodiment of the invention.
Fig. 7 signal be device according to one embodiment of the invention.
Main element symbol description
10: display
12: panel
14: light source
16: picture
18: Histogram statistics
20: device
22: representative data brightness module
24: target display brightness value module
26: energy-conservation motivation value module
28: reference curve module
30: Energy-saving Data brightness value module
32: display characteristic module
34: Histogram statistics module
36: automatic mode control module
38: promote mode control module
100: flow process
102-114: step
P [i, j]: pixel
U [i, j]: pixel cell
Y, Y [i, j]: display brightness value
Y_th: face limit display brightness value
Ypr: target display brightness value
Data0 [i, j]: raw data brightness
DataRP: representative data brightness
DataT: reference data
DataSV [i, j]: Energy-saving Data brightness
DataIn [i, j]: input data luminance
D [.], DataL: luminance data values
D_max: upper limit luminance data values
PWM: motivation value
PWM_th: face limit motivation value
PWM0: original driving
PWMsv0, PWMsv: energy-conservation driving
PWMin: input queued switches
L (. .): display characteristic
V (.): reference curve
H [.]: group
H [.]: represent group
PseuMAX [.]: accurate representative data brightness
A: ratio
TR, TR2: track
Embodiment
Please refer to Fig. 1, what it illustrated is the schematic diagram implementing display power-saving technology according to one embodiment of the invention in a display 10.Display 10 comprises a panel 12 (such as a liquid crystal panel) and a light source 14 (such as a back light); Panel 12 is provided with multiple pixel cell, represents in the 1st figure with pixel cell U [i, j].The transparency (penetrance) of pixel cell U [i, j] to light source 14 is controlled by the input data luminance DataIN [i, j] of a correspondence, such as, Y-component data in YCrCb color space.The light luminance that light source 14 provides then is controlled by an input queued switches PWMin; For example, the brightness of light source 14 can be controlled by the driving signal of pulse-width modulation (pulse width modulation), and this drives work period (duty cycle) size of signal just to represent the motivation value size of input queued switches PWMin; The motivation value of input queued switches PWMin is larger, and drive the work period of signal larger, the brightness that light source 14 provides for panel 12 is also higher.
Display 10 in pixel cell U [i, j] the actual brightness presented can be expressed as display brightness value Y [i, j]; Display brightness value Y [i, j] can depend on the brightness of light source 14 and the corresponding luminance data values size inputting data luminance DataIN [i, j].The brightness controlled provided due to light source 14 is in input queued switches PWMin, therefore display brightness value Y [i, j] can be expressed as input queued switches PWMin and input data luminance DataIN [i, j] function: Y [i, j]=L (DataIn [i, j], PWMin); Wherein, function L (. .) represent the brightness display characteristic of display 10.Different displays can have different display characteristics.In practice, the display characteristic that can pass through measurement display 10 to set up follow-up brightness/motivation value switching foundation, such as, sets up the relation table of a display characteristic.
One is made up of multiple pixel in order to the picture 16 be presented on indicator screen, and the function mode of the plurality of pixel is that essence is identical in category of the present invention; In FIG, representatively chat bright with pixel p [i, j].Pixel p [i, j] can be associated to a raw data brightness Data0 [i, j], and it is the brightness data of pixel p [i, j].When display 10 will show this picture 16 under an original light-source brightness, pixel cell U [i, j] can in order to display pixel p [i, j], therefore raw data brightness Data0 [i, j] can as input data luminance DataIN [i, j], original driving PWM0 corresponding to original light source brightness is then as input queued switches PWMin.
The present invention is that the display 10 of the present embodiment realizes energy-conservation display technique, corresponding Energy-saving Data brightness DataSV [i, j] be provided to drive PWMsv with energy-conservation according to the raw data brightness Data0 [i, j] of image frame 16 and the original PWM0 of driving; Energy-saving Data brightness DataSV [i, j] and the energy-conservation PWMsv of driving can replace raw data brightness Data0 [i, j] and drive PWM0 with original.When display 10 according to raw data brightness Data0 [i, j] with original drive PWM0 display frame 16 time, its power consumption is higher; Relatively, when display 10 according to Energy-saving Data brightness DataSV [i, j] with energy-conservation drive PWMsv display frame 16 time, its power consumption just can reduce, and reaches the object of energy saving.The energy-conservation driving PWMsv that luminance data values luminance data values is lower effectively can reduce the power consumption of light source 14, and even the overall power of display 10, on the other hand, larger Energy-saving Data brightness DataSV [i, j] then can compensation pixel p [i, j] because of darker the lost brightness of light source 12, therefore, in order to suitably maintain image quality, (such as display 10 is in pixel cell U [i, j] in pixel p [i, j] the actual brightness presented, i.e. display brightness value Y [i, j], and/or the bright blindstory of overall picture), Energy-saving Data brightness DataSV [i, j] data value can be greater than raw data brightness Data0 [i, j] data value, make the motivation value of energy-conservation driving PWMsv can be less than the motivation value of original driving PWM0.
Please refer to Fig. 2, what it was illustrated is according to the flow process 100 of one embodiment of the invention, can be applicable to Fig. 1 display 10, to realize energy-conservation display technique of the present invention.The key step of flow process 100 can be described below.
Step 102: start.When display 10 prepares to show a picture 16, just flow process 100 can be started.
Step 104: many raw data brightness Data0 [i, j] receiving many pixels of picture 16, and provide one to represent data luminance DataRP according to these raw data brightness Data0 [i, j].Because display 10 is be made up of the panel 12 and light source 14 with many pixel cells U [i, j], corresponding to multi input data luminance DataIN [i, j], light source 14 only can provide the single brightness corresponding to same input queued switches PWMin.Accordingly, at calculating input queued switches PWMin with before replacing original driving PWM0, must first from raw data brightness Data0 [i, j] in select or calculate single representative data brightness DataRP, obtain corresponding single input queued switches PWMin in order to do making the present invention through this single representative data brightness DataRP.Thereafter and as the anti-new input data luminance DataIN [i, j] pushed away corresponding to each pixel p [i, j] of benchmark.All the other steps describe in detail as after.In step 104, several different patterns available determine representative data brightness DataRP.In one embodiment, under an image quality mode of priority, can at all raw data brightness Data0 [i of picture 16, j] the middle raw data brightness representatively data luminance DataRP selecting luminance data values maximum, that is the maximal value Data0_max directly making representative data brightness DataRP equal in raw data brightness Data0 [i, j].In another embodiment, under an energy conservation priority pattern, representative data brightness DataRP can be determined according to a certain statistical property of all raw data brightness Data0 [i, j], in such a mode, representative data brightness DataRP can be less than raw data brightness maxima Data0_max.Under being below described in energy conservation priority pattern, select an embodiment of representative data brightness DataRP.
As shown in Figure 3 according to the mode determining representative data brightness in one embodiment of the invention.In step 104, comprise first to many raw data brightness Data0 [i of picture 16, j] carry out a Histogram statistics 18, with by these raw data brightness Data0 [i, j] be sequentially classified to from large to small multiple order group h [1] from high to low, h [2] ..., h [m] to h [M], wherein M can be one preset integer.For example, group h [m] can be associated with one group of luminance data values scope d [m-1] to d [m] preset; If the data value of a certain raw data brightness Data0 [i0, j0] is less than luminance data values d [m-1] and is greater than luminance data values d [m], this raw data brightness Data0 [i0, j0] just can be classified in this group h [m].In this embodiment, in the classified group h [1] the highest to order of raw data brightness maxima Data0_max.
Under energy conservation priority pattern, group H [1] to H [K] can be represented by selecting K in group h [1] to h [M] further, respectively representing group H [k] corresponding and representing number N r [k]; Wherein, by the highest group h [1] of order to each represent group H [k] the number of raw data brightness Data0 [i, j] that adds up meet each representative number N r [k] represented corresponding to group H [k].For example, suppose that picture 16 has N raw data brightness Data0 [i, j], represent a certain number percent that number N r [k] then can equal N; If by group h [1], h [2] to group h [m0] the raw data brightness number that adds up meet represent number N r [k] (such as: accumulative number with represent number N r [k] closest to but be not less than represent number N r [k]), elect one as by group h [m0] and represent group H [k].For example, as shown in Figure 4, in one embodiment, K can equal 4, Nr [1] to Nr [4] and can equal N*1/100 respectively, N*2/100, N*4/100 and N*8/100; That is, by all N raw data brightness Data [i, j] from large to small sequence grouping after, represent group corresponding to module H [1] by the highest group h [1] of order to first to contain luminance data values altogether and sort in the raw data brightness Data0 [i of front 1%, j], by group h [1] to the 4th the raw data brightness Data0 [i representing group corresponding to module H [4] and contain, j] luminance data values then contains the raw data brightness Data0 [i, j] sorted in front 8%.
According to the statistical property of each raw data brightness Data0 [i, j] represented in group H [1] to H [K], namely can be energy conservation priority pattern and representative data brightness DataRP is provided.For example, the statistical property that can represent the raw data brightness Data0 [i, j] of group H [k] according to group h [1] to each and be respectively represent the accurate representative data brightness PseuMAX [k] that group H [k] provides a correspondence.Such as, accurate representative data brightness PseuMAX [k] can be that group h [1] is to the mean value or the minimum value that represent all raw data brightness Data0 [i, j] in group H [k].Further, the DataRP of the representative data brightness under energy conservation priority pattern can be provided according to accurate representative data brightness PseuMAX [1] to PseuMAX [K].For example, representative data brightness DataRP can be made to equal average to PseuMAX [K] of accurate representative data brightness PseuMAX [1].Representative data brightness DataRP under energy conservation priority pattern can be less than raw data brightness maxima Data0_max.
Except predefined only can set the previous embodiment of representative data brightness DataRP with image quality mode of priority or energy conservation priority model selection, in another embodiment, which kind of in step 104, can be selected pattern will set representative data brightness DataRP with by the user of display 10.In another embodiment, dynamically provide an intensity according to each group h [1] to the number of the raw data brightness Data0 [i, j] in h [M]; If intensity meets a concentrated condition preset, then with image quality mode of priority setting representative data brightness DataRP, namely with raw data brightness maxima Data0_max representatively data luminance DataRP.Relatively, if intensity does not meet concentrated condition, then available energy-conservation mode of priority setting representative data brightness DataRP, makes representative data brightness DataRP be less than raw data brightness maxima Data0_max.In an embodiment, the assessment of intensity can be: in the group that preset number is adjacent the raw data brightness Data0 [i that adds up, j] number whether more than one preset concentrate accumulative number (this concentrates accumulative number can be a preset percentage of total N), if so, be then judged as meeting concentrated condition.In other words, when carrying out flow process 100 to different pictures 16, the indivedual intensities dynamically according to different pictures select different mode to set each self-corresponding representative data brightness DataRP of different pictures respectively.
When meeting concentrated condition, represent that the luminance data values of most raw data brightness Data0 [i, j] is all more or less the same and concentrates near a certain luminance data values; That is the major part of picture can present homogeneous and change little brightness.Such as, an entirely black display frame.When showing the picture of this kind of brightness uniformity, focusing on of focusing on does not make luminance distortion; Therefore, image quality mode of priority can be selected to set representative data brightness DataRP, the bright blindstory of picture can not be compressed.Relatively, if a certain picture does not meet concentrated condition, represent that the light and shade change of this picture is more, user not easily discovers the distortion slightly of the shade of grey when watching picture, therefore energy conservation priority pattern can be selected to set representative data brightness DataRP, to promote energy-conservation effect.
In another embodiment, in time stipulating concentrated condition, also the intensity of raw data brightness Data0 [i, j] can be assessed according to the standard deviation (standard deviation) of all raw data brightness Data0 [i, j] or similar statistical property; For example, compared with the luminance data values scope d [m-1] to d [m] of each group h [m], if standard deviation is divided by luminance data values range size | d [m-1]-d [m] | ratio be less than a certain default ratio, be then judged as meeting concentrated condition.
Step 106: the luminance data values having set representative data brightness DataRP in step 104.Then, in step 106, just can according to the original driving motivation value of PWM0 and the luminance data values of representative data brightness DataRP, by display characteristic L (., .) in check out the display brightness value Y=L (DataRP, PWM0) of a correspondence, using as a target display brightness value Ypr, namely Ypr=L (DataRP, PWM0).Please refer to Fig. 1, equivalence, if display 10 is with original driving PWM0 driving light source 14 and using representative data brightness DataRP as a certain pixel cell U [i, j] input data luminance DataIN [i, j], namely the display brightness value that then this pixel cell U [i, j] presents equals target display brightness value Ypr.In practice, the display characteristic L of in advance measurements (. .) can the form of comparison list present, in detail as following.
Please refer to Fig. 5, what it was illustrated is according to one embodiment of the invention, display characteristic L (. .) the luminance data values DataL of 0 to 255 and the motivation value PWM of 0 to 100 are associated to corresponding display brightness value Y as how comparison list form.In the present embodiment, original driving PWM0 corresponds to motivation value PWM, raw data brightness Data0 [i, j] and representative data brightness DataRP and corresponds to luminance data values DataL.In Figure 5, be 0,10,20,30,40,50,60,70,80,90 and 100 with motivation value PWM, luminance data values DataL be 255,240,224,208,192,176,160,144,128,112,96,80,64,48,32,16 and 0 be combined as example to illustrate display characteristic L (. .) how the luminance data values DataL of 0 to 255 and the motivation value PWM of 0 to 100 are associated to corresponding display brightness value Y.For example, as shown in Figure 5, when motivation value PWM and luminance data values DataL is respectively 100 and 255, the brightness shown on display 10 is the highest, and its display brightness value Y can be turned to 255 by regular.When motivation value PWM and luminance data values DataL is respectively 100 and 128, display brightness value Y then can be reduced to 71.If when motivation value PWM and luminance data values DataL is respectively 70 and 255, display brightness value Y is then 164.Different motivation value PWM and luminance data values DataL combines and also can correspond to same display brightness value Y; For example, when motivation value PWM and luminance data values DataL is respectively 70 and 160, display brightness value Y is 69; When motivation value PWM and luminance data values DataL is respectively 40 and 255, display brightness value Y equals 69 too.
Step 108: the target display brightness value Ypr of step 106 is substituting in a reference curve V (.), by checking out one group of corresponding brightness value and motivation value in reference curve V (Ypr), energy-conservationly drive PWMsv0 respectively as a reference data DataT and.Each display brightness value Y is associated to the luminance data values DataL of the correspondence motivation value PWM corresponding with by reference curve V (Y) respectively, i.e. V (Y)=(DataL, PWM).With reference to the embodiment of figure 5, in display characteristic L (., .) in, one group of luminance data values DataL and motivation value PWM corresponds to a display brightness value Y only, but this display brightness value Y in fact may correspond in not only one group of luminance data values DataL and motivation value PWM.So reference curve V (.) display characteristic L (. .) the table of comparisons under a funtcional relationship, make each display brightness value Y only can be associated to the luminance data values DataL of the correspondence motivation value PWM corresponding with.Namely step 108 is definition this reference curve V (.), and bring target display brightness value Ypr to display brightness value Y into, and namely the input data luminance value DataL that V (Ypr) is associated and motivation value PWM is respectively benchmark inputs data luminance DataT and energy-conservationly drive PWMsv0.
In the part of definition this reference curve V (.), under display 10 does not adopt the situation of power saving display mode of the present invention, display 10 produces brightness usually under original driving PWM is the condition of maximum drive value (100); Please refer to the embodiment of Fig. 5, under original driving PWM is the condition of 100, the pass of input data luminance and display brightness is L (DataL, 100)=Ya, such as, be wherein L (176,100)=131.In the present embodiment, reference curve V (Y) can work out according to following principle.For the relation table L (DataL of the display characteristic of display 10, PWM)=Y, there is the combination (Data [1] of Q group luminance data values and motivation value, PWM [1]), (Data [2], PWM [2]), (Data [q], PWM [q]) to (Data [Q], PWM [Q]) all associate so far display brightness value Ya (i.e. L (Data [q] via display characteristic L, PWM [q])=Ya, to q=1 to Q), then can at this Q combination (Data [1], PWM [1]) to (Data [Q], PWM [Q]) in select one of them (Data [qs], PWM [qs]), make the corresponding a different set of luminance data values of display brightness value Ya and motivation value, to set this reference curve V (.).Namely make V (Ya)=(Data [qs], PWM [qs]).For example, at Q combination (Data [1], PWM [1]) to (Data [Q], PWM [Q]) in, minimum motivation value is selected as motivation value PWM [qs] in motivation value PWM [1] to PWM [Q], to make reference curve V (.), display brightness value Ya is associated to combination (Data [qs], PWM [qs]).In other words, (Data [1], PWM [1]) to (Data [Q], PWM [Q]) will be combined respectively as input data luminance DataIN [i, j] and input queued switches PWMin, display 10 all can demonstrate identical brightness display brightness value Ya; But the motivation value PWM [qs] of combination (Data [qs], PWM [qs]) is minimum, also just maximum power consumption can be saved.Accordingly, luminance data values Data [qs] can be maximum in luminance data values Data [1] to Data [Q].In one embodiment, a certain display brightness value Ya=131 being 100 times generations based on said PWM is example, in the relation table of the display characteristic of display 10 (as shown in Figure 5), finds the display brightness being similar to or equaling Ya=131.Following combination can be found in Figure 5, as: (192,90)=132, (208,80)=136, (255,60)=133 ... etc..Minimum at PWM have (being similar to) display brightness 133 met when being 60, and therefore, input data luminance 255 is obtained a respective value as working out in reference curve V (.).This embodiment takes the mode finding approximate former display brightness to the input data luminance finding reference curve corresponding, may in the mode of interpolation in other embodiment, and find the simulation corresponding with former display brightness and input data luminance, details are as follows.
On the other hand, when working out reference curve V (.), also light leakage phenomena can be considered in the lump.Because light leakage phenomena is started because the brightness in light source 14 is too low, in order to avoid/subtracting and press down light leakage phenomena, the brightness of light source 14 should have a brightness lower limit, and jointly, the motivation value of input queued switches PWMin also should have facing of a lower limit to limit motivation value PWM_th; Input queued switches PWMin should be greater than this and face limit motivation value PWM_th to avoid the generation of light leakage phenomena.Therefore, when stipulating reference curve V (.), when will from the combination of same display brightness value Ya (Data [1], PWM [1]) to (Data [Q], PWM [Q]) in when selecting one of them, if motivation value minimum in motivation value PWM [1] to PWM [Q] has been less than face limit motivation value PWM_th, then reference curve V (Ya) can be associated to combination (Data_Ya, PWM_th); Wherein, luminance data values Data_Ya can make L (Data_Ya, PWM_th)=Ya.Otherwise, if motivation value PWM [qs] minimum in motivation value PWM [1] to PWM [Q] is still greater than face limit motivation value PWM_th, then display brightness value Ya still can be associated to combination (Data [qs], PWM [qs]) by reference curve V (.).
Similarly in the 5 embodiment of figure 5, the motivation value of original driving PWM0 equals 100, and limit motivation value PWM_th (refer step 108) of facing avoiding light leakage phenomena to occur then is assumed to be 50.Upper limit luminance data values D_max then equals 255.Luminance data values extremely associated by reference curve V (Y) and combination of drive values (DataL, PWM) form track TR.Due to display characteristic L (.,) threshold value PWM_th (being 50 in this example) and upper limit luminance data values D_max (its value is 255) will be driven to be associated to the display brightness value Y of numerical value 100, therefore can be stipulated by numerical value 100 be accordingly face limit display brightness value Y_th.As shown in Figure 5, in this example, equal the horizontal line of upper limit luminance data values D_max along luminance data values DataL, reference curve V (.) is associated to upper limit luminance data values D_max by being greater than the display brightness value Y facing limit display brightness value Y_th; That is V (Y)=(D_max, PWM_hrz), to Y > Y_th; Wherein, motivation value PWM_hrz makes L (D_max, PWM_hrz)=Y.Moreover, equal to face limit display brightness value Y_th place at display brightness value Y, track TR transfers to vertically, reference curve V (.) equals to face limit motivation value PWM_th horizontal line along motivation value PWM faces limit motivation value PWM_th by being less than unified being associated to of the display brightness value Y facing limit display brightness value Y_th, i.e. V (Y)=(Data_vrt, PWM_th), to Y < Y_th; Wherein, luminance data values Data_vrt makes L (Data_vrt, PWM_th)=Y.
For example, if output valve Y equal respectively 255,221,194,164,133 and be greater than face limit display brightness value Y_th (=100) time, reference curve V (Y) draws luminance data values and combination of drive values (255 respectively, 100), (255,90), (255,80), (255,70), (255,60); In these combinations, luminance data values DataL is equal to upper limit luminance data values D_max.If output valve Y equal respectively 93,59,34 and be less than face limit display brightness value Y_th (=100), reference curve V (Y) draws combination (240 respectively, 50), (192,50), (144,50), motivation value PWM is equal to and faces limit motivation value PWM_th (=50).
Step 110: benchmark data DataT (drawing in step 108) provides a ratio A, as A=DataT/DataRP with the ratio DataT/DataRP of representative data brightness DataRP (drawing in step 104).
Step 112: provide corresponding Energy-saving Data brightness DataSV [i, j] according to the ratio A of step 110 and the product of each raw data brightness DataIn [i, j].For example, ratio A can equal DataT/DataRP, and Energy-saving Data brightness DataSV [i, j] can be: DataSV [i, j]=A*DataIn [i, j].Moreover, also can provide energy-conservation driving PWMsv (Fig. 1) according to the energy-conservation driving PWMsv0 of step 108.In one embodiment, step 110 can provide the energy-conservation driving PWMsv of a normal energy saver mode, and namely the energy-conservation driving PWMsv of normal energy saver mode equals energy-conservation driving PWMsv0.And/or step 110 can provide the energy-conservation driving PWMsv of a reinforcement energy saver mode; Strengthen under energy saver mode at this, the difference of dPWM (PWMsv0-dPWM) can be driven to provide energy-conservation drive PWMsv, such as, say it is make energy-conservation driving PWMsv=(PWMsv0-dPWM) according to default reduction of energy-conservation drivings PWMsv0 and.Or in another embodiment strengthening energy saver mode, energy-conservation driving PWMsv also can equal product Ap*PWMsv0, and wherein, ratio Ap is a preset value being less than 1.
Step 114: energy-conservation driving PWMsv and Energy-saving Data brightness DataSV [i, j] is substituting to respectively input queued switches PWMin and input data luminance DataIN [i, j], with display frame 16, and process ends 100.So, just energy-conservation display technique can be realized when taking into account image quality and light leakage phenomena.
Utilize Fig. 5 display characteristic L (. .) situation of carrying out flow process 100 with reference curve V (.) can be described below.In all raw data brightness Data0 [i, j] of picture 16, can maximal value wherein be elected as representative data brightness DataRP (step 104).Suppose that the representative data brightness DataRP of picture 16 equals 208, and the motivation value of original driving PWM0 is 100, then by display characteristic L (., .) can check out, when luminance data values DataL be 208, motivation value PWM be 100 time, the display brightness value Y of its correspondence is 181, i.e. target display brightness value Ypr=181 (step 106).Target display brightness value Ypr=181 is substituting to reference curve V (.), luminance data values DataL and the motivation value PWM that can check out its correspondence are respectively 255 and 75 (numerical value 75 can be obtained by numerical value 80 and 70 interpolation), that is, reference data DataT and the energy-conservation PWMsv0 that drives equals 255 and 75 (step 108) respectively.Then, ratio A=DataT/DataRP=255/208 (step 110) can be obtained by reference data DataT and representative data brightness DataRP, and can by DataSV [i, j]=A*Data0 [i, j] with PWMsv=PWMsv0 and provide Energy-saving Data brightness DataSV [i, j] to drive PWMsv (step 112,114 and Fig. 1) with energy-conservation.Display 10 can drive PWM0 display frame 16 according to raw data brightness Data0 [i, j] with original originally; But, when display 10 changes according to Energy-saving Data brightness DataSV [i, j] with energy-conservation drive PWMsv display frame 16 time, the image quality (as the shade of grey) not only shown can not be deteriorated, energy-conservation object can also be reached, because energy-conservation driving PWMsv=75, be less than original driving PWM0=100.Via the gain of ratio A, Energy-saving Data brightness DataSV [i, j] can be greater than raw data brightness Data0 [i, j], with the energy-conservation driving PWMsv that compensate for slower is low, and then maintains the image quality of picture display.For example, the maximal value in raw data brightness Data0 [i, j] is 181, and after via the gain of ratio A, the maximal value in Energy-saving Data brightness DataSV [i, j] can be increased to 255, namely the upper limit of luminance data values DataL; Therefore, the range of decrease between original driving PWM0 to energy-conservation driving PWMsv also can be maximum.Moreover, face limit motivation value PWM_th because energy-conservation driving PWMsv=75 is still greater than, therefore can not light leakage phenomena be caused.
Flow process 100 discloses advantage of the present invention: as shown in Figure 2, via target display brightness value Ypr, reference curve V (.) can when considering light leakage phenomena by representative data brightness DataRP (corresponding raw data brightness Data0 [i, j]) drive PWMsv0 with the reference data DataT (corresponding Energy-saving Data brightness DataSV [i, j]) that the original PWM0 of driving is associated under identical display brightness value with energy-conservation; Because display brightness value is identical, image quality can maintain.Moreover the luminance data values of representative data brightness DataRP can lower than reference data DataT, therefore energy-conservation driving PWMsv0 can lower than original driving PWM0, with power and energy saving.
If display 10 is for showing a series of multiple picture, such as, multiple picture frame pictures in dynamic image, then can carry out flow process 100 respectively to different pictures, to obtain different energy-conservation driving PWMsv, different ratio A and corresponding Energy-saving Data brightness adaptively for different pictures.
Another act one example; If the representative data brightness DataRP of picture 16 equals 112, the target display brightness value Ypr of numerical value 57 can be demonstrated under original motivation value PWM0, i.e. L (112,100)=57.V (57)=(189,50) can be checked out, i.e. reference data DataT=189 by reference curve V (.).Ratio A=DataT/DataRP=189/112 can be obtained thus, therefore raw data brightness Data0 [i, j] can be multiplied by ratio A with by gain to larger Energy-saving Data brightness DataSV [i, j], energy-conservation driving PWMsv then can drop to the lower energy-conservation driving PWMsv0=50 of power consumption by the original driving PWM0=100 that power consumption is higher accordingly.By display characteristic L (., .) known, if by representative data brightness DataRP gain to upper limit luminance data values D_max (namely 255), corresponding motivation value PWM can drop to about 35 (i.e. L (255,35)=L (112,100)=57); But, motivation value PWM=35 is lower than facing limit motivation value PWM_th (being 50 in this example).Therefore, when display brightness value Y be less than light leakage phenomena face limit display brightness value Y_th time, energy-conservation drivings PWMsv0 fixed correlation can be limit motivation value PWM_th, to avoid light leakage phenomena to facing by reference curve V (Y) in Fig. 5.
At proportion of utilization A by raw data brightness Data0 [i, j] gain is to Energy-saving Data brightness DataSV [i, j]=A*Data0 [i, j] time (such as step 112), if raw data brightness Data0 is [i, j] the red, green, blue three colouring component R [i of corresponding rgb color space, j], G [i, j] and B [i, j], then Energy-saving Data brightness DataSV [i, j] namely corresponding red, green, blue three colouring component be respectively component A * R [i, j], A*G [i, j] and A*B [i, j].If raw data brightness Data0 is [i, j] three-component Y [i, j], Cr [i, j] and the Cb [i of corresponding YCrCb color space, j], Y, Cr and the Cb three-component that then Energy-saving Data brightness DataSV [i, j] is corresponding is respectively component A * Y [i, j], Cr [i, j] and Cb [i, j], only luminance component Y [i, j] needs by gain.
Please refer to Fig. 6, what it was illustrated is according to the track TR2 of further embodiment of this invention, in order to define the another embodiment of reference curve V (.).As shown in track TR2, reference curve V (.) can have multiple turning point, divides into multiple level and/or vertical paragraph with reference to curve V (.).In each horizontal paragraph, different display brightness value Y is corresponded to identical luminance data values DataL by reference curve V (.), but corresponds to different motivation value PWM; For example, the horizontal paragraph of track TR2 between display brightness value Y=255 to 194 makes different display brightness value Y all corresponding same brightness data value DataL=255, but is changed to 194 with display brightness value Y by 255, and motivation value PWM is changed to 80 by 100; Similarly, the horizontal paragraph between display brightness value Y=158 to 109, different display brightness value Y all corresponding same brightness data value DataL=224, but the motivation value PWM of association is then changed to 60 by 80.On the other hand, in each vertical paragraph, different display brightness value Y is corresponded to identical motivation value PWM by reference curve V (.), but corresponds to different luminance data values DataL.For example, between display brightness value Y=194 to 158, track TR2 presents a horizontal paragraph; In this horizontal paragraph, all corresponding identical motivation value PWM=80 of different display brightness value Y, but be changed to 158 with display brightness value Y by 194, luminance data values Data is also changed to 224 by 255.
Utilize display characteristic L (., .) when stipulating reference curve V (.), reference curve V (.) also can be oblique line, curve, or by one or the horizontal paragraph of multistage, synthesized by vertical paragraph, oblique line paragraph and/or curve paragraph.Reference curve V (.) must be continuous print, to make the luminance data values of Energy-saving Data brightness different in same picture can be associated to different display brightness values, maintains the due shade of grey of original picture.
Please refer to Fig. 7, what it was illustrated is according to the device 20 of one embodiment of the invention, and it can be implemented Fig. 2 flow process 100 and be that Fig. 1 display 10 realizes energy-conservation display technique.Device 20 comprises one and represents energy-conservation motivation value module 26, reference curve module 28, Energy-saving Data brightness value module 30, display characteristic module 32, Nogata statistical module 34, the automatic mode control module 36 and of data luminance module 22, target display brightness value module 24, and promote mode control module 38.Representative data brightness module 22, target display brightness value module 24, energy-conservation motivation value module 26 and Energy-saving Data brightness value module 30 coupled in series.
In apparatus 20, display characteristic module 32 couples target display brightness value module 24, in order to access/provide display 10 display characteristic L (. .); Display characteristic is that the input luminance data values DataL of data luminance DataIN and the motivation value size PWM of input queued switches PWMin is associated to brightness display brightness value Y, i.e. Y=L (DataL, PWMin).For example, before display 10 dispatches from the factory, can first by the brightness display brightness value gone out shown by display 10 under the different luminance data values of optics apparatus measures, different driving value, obtain accordingly display characteristic L corresponding to display 10 (. .).Because of the difference that material, processing procedure and/or processing are assembled, the display characteristic of different display can be different.Reference curve module 28 couples energy-conservation motivation value module 26, according to display 10 display characteristic L (. .) family curve V (.) is provided; Display brightness value Y is associated to the combination of one group of luminance data values DataL and motivation value PWM by family curve V (.), i.e. V (Y)=(DataL, PWM).As the 2nd figure discussed, stipulate family curve V (.) can consider display 10 face limit motivation value PWM_th, to reduce the impact of light leakage phenomena; And this motivation value of facing limit motivation value PWM_th also can measure before display 10 dispatches from the factory.Because of the difference that material, process variation and/or processing are assembled, facing corresponding to different display limits motivation value PWM_th can be different, therefore facing of each display limits motivation value PWM_th to can be used to the light leak characteristic representing that display is unique individually quantitatively.
Histogram statistics module 34 couples representative data brightness module 22 and automatic mode control module 36.When wanting display frame 16 (Fig. 1), Histogram statistics module 34 is according to the raw data brightness Data0 [i of picture 16, j] carry out Histogram statistics, the Histogram statistics such as, discussed in step 104 and Fig. 3, with the size according to luminance data values by the raw data brightness Data0 [i of different pixels, j] be sequentially classified to multiple order group h [1] to h [M] from high to low, representative data brightness module 22 is made to be able to provide representative data brightness DataRP according to the statistical property of raw data brightness Data0 [i, j].
As the embodiment discussed in step 104, automatic mode control module 36 can provide an intensity according to the number of the raw data brightness Data0 [i, j] in Histogram statistics Zhong Ge group h [m].If intensity meets one concentrate condition, automatic mode control module 36 makes representative data brightness module 22 provide representative data brightness DataRP according to raw data brightness maxima Data0_max, and this i.e. image quality mode of priority.If intensity does not meet concentrated condition, then representative data brightness module 22 can make representative data brightness DataRP be not more than raw data brightness maxima Data0_max under the control of automatic mode control module 36, this i.e. energy conservation priority pattern, such as, shown in Fig. 4 embodiment.
Target display brightness value module 24 according to original driving PWM0 and representative data brightness DataRP by display characteristic V (. .) in check out target display brightness value Ypr, as step 106.Energy-conservation motivation value module 26 according to target display brightness value Ypr by checking out reference data DataT and the energy-conservation PWMsv0 that drives in reference curve V (.), also can provide energy-conservation driving PWMsv, as step 108 according to energy-conservation driving PWMsv0.Relation between Energy-saving Data brightness value module 30 benchmark data DataT and representative data brightness DataRP obtains ratio A, and according to ratio A gain raw data brightness Data0 [i, j], to provide Energy-saving Data brightness DataSV [i, j], as step 110 and 112.Then, display 10 just can by Energy-saving Data brightness DataSV [i, j] and the energy-conservation PWMsv that drives respectively as inputting data luminance DataIN [i, j] and input queued switches PWMin, with display frame 16.
Promote mode control module 38 and be coupled to energy-conservation motivation value module 26, strengthen energy saver mode to provide a normal energy saver mode and (or multiple).In normal energy saver mode, energy-conservation motivation value module 26 can make energy-conservation driving PWMsv equal energy-conservation driving PWMsv0 under the control promoting mode control module 38.In reinforcement energy saver mode, energy-conservation motivation value module 26 can make energy-conservation driving PWMsv equal energy-conservation driving PWMsv0 and preset to reduce the difference (PWMsv0-dPWM) driven between dPWM, to reduce the power consumption of light source further under the control promoting mode control module 38.The image quality mode of priority of automatic mode control module 36 and energy conservation priority pattern can with the normal energy saver mode promoting mode control module 38 with strengthen energy saver mode and mutually arrange in pairs or groups and uses, such as say it is to arrange in pairs or groups one of them of normal energy saver mode or reinforcement energy saver mode with image quality mode of priority.
Device 20 can be integrated in the display controller of display 10, and each module in device 20 can use software, hardware and/or firmware or its combination to realize.For example, Histogram statistics module 34 can realize with hardware circuit, and automatic mode control module 36, representative data brightness module 22, target display brightness value module 24, energy-conservation motivation value module 26 and Energy-saving Data brightness value module 30 can be arranged in pairs or groups corresponding source code and realizing with a processor.Record display characteristic L (., .) display characteristic module 32 Usable pot circuit realiration, display brightness value Y=L (DataL, PWM) corresponding with different driving value PWM for different luminance data values DataL is saved as the look-up table (look-up table) that can for consult.
In summary, the present invention can take into account image quality and energy-conservation, can maintain the suitable image quality shade of grey, effectively can save again the light source power consumption of display, also can avoid because of excessively energy-conservation caused light leakage phenomena.The present invention can apply to the display of portable electronic devices, during extending the powered battery of portable electronic devices; The present invention also can be used in the audio-visual electronic equipment of large size panel, effectively to save the high power consumption of large panel light source.
In sum, although the present invention with preferred embodiment disclose as above, so itself and be not used to limit the present invention.Persond having ordinary knowledge in the technical field of the present invention, without departing from the spirit and scope of the present invention, when being used for a variety of modifications and variations.Therefore, protection scope of the present invention is when being as the criterion with claims.
Claims (24)
1. a method for energy-conservation display, is applied to a display, and this display has a display characteristic, and a data luminance value and a motivation value are associated with a display brightness value by it, and this motivation value is relevant to a light-source brightness, and the method comprises:
There is provided a reference curve, this display brightness value is associated to a reference data brightness value and a referenced drive value by it;
An original motivation value of data luminance value and correspondence is represented according to one of a picture, by checking out a target display brightness value in this display characteristic, wherein this representative data brightness value is according to an image quality mode of priority and one of them selection of an energy conservation priority pattern;
According to this target display brightness value, by checking out an Energy-saving Data brightness value and an energy-conservation motivation value in this reference curve; And
According to the relation between this Energy-saving Data brightness value and this representative data brightness value, carry out energy-conservation display for this picture.
2. the method for claim 1, is characterized in that, this picture comprises many raw data brightness values, and the method also comprises:
Using the maximal value in these raw data brightness values as this representative data brightness value.
3. the method for claim 1, is characterized in that, this picture comprises many raw data brightness values, and the method also comprises:
Carry out a Histogram statistics, these raw data brightness values are sequentially classified to multiple order group from high to low from large to small.
4. method as claimed in claim 3, is characterized in that, also comprise:
Representing group by selecting preset number in these groups, respectively representing group's correspondence one and representing number; Wherein, by the highest this group of order to respectively this represent group the number of these raw data brightness values that adds up meet respectively that this represents corresponding this of group and represents number; And
This representative data brightness value is provided according to the highest this group of order to each these these raw data brightness values represented in group.
5. method as claimed in claim 4, is characterized in that, also comprise:
According to the highest this group of order to respectively this represents these raw data brightness values in group for respectively this represents group and provides representative data brightness value surely;
This representative data brightness value is provided according to this preset number accurate representative data brightness value.
6. method as claimed in claim 5, is characterized in that, its according to the highest this group of order to respectively this represents the mean value of these raw data brightness values in group or minimum value and for respectively this represents the accurate representative data brightness value that group provides this correspondence.
7. method as claimed in claim 5, is characterized in that, its mean value according to this preset number accurate representative data brightness value and provide this representative data brightness value.
8. method as claimed in claim 3, is characterized in that, also comprise:
Number according to these raw data brightness values in each this group provides an intensity;
If this intensity meets one concentrate condition, is this representative data brightness value with the luminance data values maximal value raw data brightness of these raw data brightness values; If this intensity does not meet this concentrated condition, be then this representative data brightness value to be less than a numerical value of the maximal value of these raw data brightness values.
9. the method for claim 1, is characterized in that, also comprises:
There is provided a ratio according to the ratio between this energy-conservation luminance data values and this representative data brightness value, and according to the product of this ratio with each this raw data brightness value, carry out energy-conservation display for this picture.
10. the method for claim 1, is characterized in that, also comprises and provides one second energy-conservation motivation value according to this energy-conservation motivation value and a default difference of reducing motivation value, carry out energy-conservation display for this picture.
11. the method for claim 1, is characterized in that, also comprise:
Light leak characteristic according to this display provides one to face limit motivation value; And
According to this face limit motivation value this reference curve is provided.
12. methods as claimed in claim 11, is characterized in that, wherein a upper limit luminance data values and this are faced and limit motivation value to correspond to one to face and limit display brightness value by this display characteristic, and the method also comprises:
Make this reference curve be associated to this upper limit luminance data values by being greater than this this display brightness value of facing limit display brightness value, and make this reference curve be associated to this face limit motivation value by being less than this this display brightness value of facing limit display brightness value.
The device of 13. 1 kinds of energy-conservation displays, is applied to a display, and this display has a display characteristic, and a data luminance value and a motivation value are associated with a display brightness value by it, and this motivation value is relevant to a light-source brightness, and this device comprises:
One represents data luminance module, provides the original motivation value that of a picture represents data luminance value and its correspondence, and wherein according to an image quality mode of priority and an energy conservation priority pattern, one of them selects this representative data brightness value;
One reference curve module, provides a reference curve, and this display brightness value is associated to a reference data brightness value and a referenced drive value by it;
One target display brightness value module, according to this original motivation value and this representative data brightness value, by checking out a target display brightness value in this display characteristic;
One energy-conservation motivation value module, according to this target display brightness value, by checking out an Energy-saving Data brightness value and an energy-conservation motivation value in this reference curve; And
One Energy-saving Data brightness value module, carries out energy-conservation display according to the relation between this Energy-saving Data brightness value and this representative data brightness value for this picture.
14. devices as claimed in claim 13, it is characterized in that, this picture comprises many raw data brightness values, and this representative data brightness module is using the maximal value in these raw data brightness values as this representative data brightness value.
15. devices as claimed in claim 13, it is characterized in that, this picture comprises many raw data brightness values, and this device also comprises:
One Nogata statistical module, carries out a Histogram statistics, and these raw data brightness values are sequentially classified to multiple order group from high to low from large to small.
16. devices as claimed in claim 15, is characterized in that, this representative data brightness module represents group by selecting preset number in these groups, respectively represents group's correspondence one and represents number; Wherein, by the highest this group of order to respectively this represent group the number of these raw data brightness that adds up meet respectively that this represents corresponding this of group and represents number; Further, this representative data brightness module more provides this representative data brightness value according to the highest this group of order to each these these raw data brightness values represented in group.
17. devices as claimed in claim 16, it is characterized in that, this representative data brightness module more according to the highest this group of order to respectively this represents these raw data brightness values in group and for respectively this represents group and provides representative data brightness value surely, and provide this representative data brightness value according to this preset number accurate representative data brightness value.
18. devices as claimed in claim 17, it is characterized in that, this representative data brightness module according to the highest this group of order to respectively this represents the mean value of these raw data brightness values in group or minimum value and for respectively this represents the accurate representative data brightness value that group provides this correspondence.
19. devices as claimed in claim 17, is characterized in that, this representative data brightness module provides this representative data brightness value according to the mean value of this preset number accurate representative data brightness value.
20. devices as claimed in claim 15, is characterized in that, also comprise:
One automatic mode control module, the number according to these raw data brightness values in each this group provides an intensity; If this intensity meets one concentrate condition, this automatic mode control module is this representative data brightness value with the maximal value of these raw data brightness values; If this intensity does not meet this concentrated condition, be then this representative data brightness value to be less than a numerical value of the maximal value of these raw data brightness values.
21. devices as claimed in claim 13, it is characterized in that, this Energy-saving Data brightness value module provides a ratio according to the ratio of this energy-conservation luminance data values and this representative data brightness value, and according to the product of this ratio with each this raw data brightness value, carries out energy-conservation display for this picture.
22. devices as claimed in claim 13, is characterized in that, this energy-conservation motivation value module is also preset a difference of reducing motivation value according to this energy-conservation motivation value and one and provided one second energy-conservation motivation value, carries out energy-conservation display for this picture.
23. devices as claimed in claim 13, it is characterized in that, this reference curve module more faces limit motivation value according to the light leak property settings one of this display, and according to this face limit motivation value this reference curve is provided.
24. devices as claimed in claim 23, it is characterized in that, one upper limit luminance data values and this are faced by this display characteristic to be limit motivation value to correspond to one to face and limit display brightness value, and this reference curve module makes this reference curve be associated to this upper limit luminance data values by being greater than this this display brightness value of facing limit display brightness value, and this reference curve is made to be associated to this to face limit motivation value by being less than this this display brightness value of facing limit display brightness value.
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| TWI385628B (en) * | 2007-10-05 | 2013-02-11 | Novatek Microelectronics Corp | Apparatus and method for dynamically controlling backlight |
| JP2010002876A (en) * | 2008-05-19 | 2010-01-07 | Sony Ericsson Mobilecommunications Japan Inc | Display device, display control method, and display control program |
| JP5307527B2 (en) * | 2008-12-16 | 2013-10-02 | ルネサスエレクトロニクス株式会社 | Display device, display panel driver, and backlight driving method |
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2011
- 2011-12-26 CN CN201110441449.8A patent/CN103177707B/en not_active Expired - Fee Related
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