CN101727876A - Backlight luminance control method and device - Google Patents
Backlight luminance control method and device Download PDFInfo
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- CN101727876A CN101727876A CN200810201159A CN200810201159A CN101727876A CN 101727876 A CN101727876 A CN 101727876A CN 200810201159 A CN200810201159 A CN 200810201159A CN 200810201159 A CN200810201159 A CN 200810201159A CN 101727876 A CN101727876 A CN 101727876A
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Abstract
The invention relates to backlight luminance control method and device. The method comprises the following steps of: firstly, calculating a luminance characteristic value of the current picture frame and comparing luminance characteristic values of the current picture frame and the previous picture frame; if an absolute difference of the luminance characteristic value of the current picture frame and the luminance characteristic value of the previous picture frame is smaller than a threshold value, carrying out average operation on the luminance characteristic values of the current picture frame and a plurality of previous picture frames to obtain an average luminance characteristic value; if the absolute difference of the luminance characteristic value of the current picture frame and the luminance characteristic value of the previous picture frame is larger than the threshold value, adopting the luminance characteristic value of the current picture frame as the average luminance characteristic value; and finally adjusting the backlight luminance according to the average luminance characteristic value.
Description
Technical field
The invention relates to a kind of display device, and particularly relevant for the backlight brightness control method and the device that can promote the dynamic image contrast.
Background technology
For the display device of (Backlight) backlight for having, (DynamicBacklight Luminance, DBL) technology can promote the dynamic contrast of display panel to utilize dynamic backlight.When bright attitude picture, the dynamic backlight technology is kept normal backlight illumination.When dark attitude picture, the dynamic backlight technology can dim backlight illumination, makes dark attitude picture can present the black of darker Shen.Therefore, the dynamic backlight technology can improve the contrast of display panel at the light and shade picture.For example, the display brightness of supposing bright picture is 300nits, need not to do the adjustment of backlight illumination after system's calculation of dynamic backlight, still is 300nits so final panel picture presents brightness (user's viewpoint).Otherwise the display brightness of supposing dark attitude picture is 1nits, through the calculation of the system of dynamic backlight and make 50% the brightness adjustment of doing backlight, is 0.5nits so the panel picture presents brightness.So, have the display panel of dynamic backlight, its contrast is by 300: 1 of static state, promotes to be dynamic 600: 1.
Yet, though the conventional dynamic backlight technology can dynamically be adjusted backlight illumination along with the light and shade of display frame, but have in the clear and definite bright variation when display frame, the conventional dynamic backlight technology but can cause the backlight can't real time reaction, and causes the factitious sensation of brightness.
Fig. 1 is explanation conventional dynamic backlight technology is dynamically adjusted backlight illumination corresponding to the brightness of display panel a picture frame sequential chart.As shown in Figure 1, its transverse axis express time.Above-listed each square of Fig. 1 represents that the picture brightness of display panel changed along with the time; Following each square represents that brightness backlight changes corresponding to the brightness of display panel.The conventional dynamic backlight technology is to utilize long picture frame (Frame) average brightness, adjusts corresponding backlight illumination.Also promptly, preceding x picture frame brightness is done on average, tried to achieve the pairing backlight illumination of present picture frame, and backlight is adjusted to this brightness, make display panel can present darker picture.The traditional dynamic backlight of this kind is adjusted mode, in picture brightness changes slowly film, does not have too much influence.As shown in Figure 1, among the time range T1, it is slowly that the picture brightness of display panel changes, and therefore traditional dynamic backlight is adjusted the brightness that mode can be adjusted backlight accordingly.
But change film faster for picture brightness, the situation generation that the conventional dynamic backlight technology can respond and only come also is that backlight can't be adjusted brightness in real time accordingly.As shown in Figure 1, when N picture frame, the shown image of display panel is jumped into bright picture (brightness is 300nits) by dark picture (brightness is 1nits), but backlight because the conventional dynamic backlight technology utilizes " mean flow rate of a preceding x picture frame ", can't change backlight illumination (shown in frame of broken lines) immediately accordingly along with picture.Also promptly, the conventional dynamic backlight technology utilize N, N-1, N-2 ..., a N-x+1 picture frame goes to calculate mean flow rate, makes the backlight illumination of N picture frame have only half of desirable brightness.The backlight illumination of this mistake need be through time of x picture frame, can be adjusted to optimal brightness backlight.
When above-mentioned defective was used on the tangible film of bright variation, human eye more can be experienced the variation of brightness.Address the aforementioned drawbacks and to set less x value.Yet when x value hour, the average computation time of expression backlight illumination is shorter, makes backlightly to be subject to bright variation the slightly of film (picture data) and to produce tangible bright back light bright.When the x value was big, the expression backlight illumination average computation time was longer, and the brightness of panel more is not subject to the bright influence that changes of film; But when film has clear and definite bright variation, (become 300nits N picture frame brightness suddenly by 1nits), but can cause the panel luminance can't real time reaction, and cause the factitious sensation of brightness as Fig. 1.
Summary of the invention
The purpose of this invention is to provide a kind of backlight brightness control method and device, when clear and definite bright variation being arranged to solve film (picture), the problem that panel luminance can't real time reaction.
For reaching above-mentioned or other purpose, the present invention proposes a kind of backlight brightness control method.At first, calculate the brightness value of present picture frame.The two brightness value of present picture frame and previous picture frame is compared.If at present the two absolute difference of the brightness value of the brightness value of picture frame and previous picture frame is less than threshold values, the brightness value of then that present picture frame is previous with it a plurality of picture frames averages computing, with acquisition mean flow rate eigenwert.If at present the two absolute difference of the brightness value of the brightness value of picture frame and previous picture frame is greater than threshold values, then with the brightness value of present picture frame as the mean flow rate eigenwert.At last, adjust backlight illumination according to the mean flow rate eigenwert.
For reaching above-mentioned or other purpose, the present invention proposes a kind of backlight brightness control devices, comprises first computing unit, second computing unit and driver element.First computing unit receives the pixel information of present picture frame, to calculate the brightness value of present picture frame.Second computing unit is coupled to first computing unit, in order to the two brightness value of more present picture frame and previous picture frame.If at present the two absolute difference of the brightness value of the brightness value of picture frame and previous picture frame is less than a threshold values, then the brightness value of second computing unit a plurality of picture frames that present picture frame is previous with it averages computing, with acquisition mean flow rate eigenwert.If at present the two absolute difference of the brightness value of the brightness value of picture frame and previous picture frame is greater than threshold values, then second computing unit with the brightness value of present picture frame as the mean flow rate eigenwert.Driver element is coupled between second computing unit and the backlight, in order to driving backlight so that backlight illumination to be provided, and adjusts backlight illumination according to the mean flow rate eigenwert.
Therefore the present invention can judge at any time that picture has or not clear and definite bright variation because of the two brightness value of more present picture frame and previous picture frame.If the bright variation of picture is very not clear and definite, then average computing to obtain the mean flow rate eigenwert; Otherwise, if the bright variation of picture is very clear and definite, then with the brightness value of present picture frame as the mean flow rate eigenwert.Therefore, when film (picture) had clear and definite bright variation, backlight illumination can be followed picture brightness in real time and be reacted.That is, if the brightness of picture frame is excessive with the different difference of brightness of previous picture frame at present, promptly revise the mean flow rate eigenwert at once, make the GTG brightness of backlight illumination and display panel can show optimal brightness output at once, cause the factitious problem of brightness and solved the conventional dynamic backlight technology.
For above and other objects of the present invention, feature and advantage can be become apparent, preferred embodiment cited below particularly, and cooperate appended graphicly, be described in detail below.
Description of drawings
Fig. 1 is explanation conventional dynamic backlight technology is dynamically adjusted backlight illumination corresponding to the brightness of display panel a picture frame sequential chart.
Fig. 2 is the process flow diagram that a kind of backlight brightness control method is described according to the embodiment of the invention.
Fig. 3 illustrates a kind of backlight brightness control devices according to the embodiment of the invention.
Fig. 4 illustrates the picture frame sequential chart of the GTG brightness of display panel corresponding to backlight illumination according to the embodiment of the invention.
Embodiment
Fig. 2 is the process flow diagram that a kind of backlight brightness control method is described according to the embodiment of the invention.System at first carries out step S210, so that capture/receive present picture frame (Frame for example is a n picture frame).Capture the pixel data (for example RGB GTG value) of present picture frame in system after, just can calculate the brightness value (step S220) of present picture frame.In the present embodiment, the RGB GTG value of each pixel in the present picture frame can be converted to the brightness value (or claiming the intensity gray scale value) of each pixel, calculate the mean value (AVG of the brightness value of all pixels in the present picture frame then
n), with brightness value as present picture frame.Step S220 can be stored in the brightness value of present picture frame in the system, in order to follow-up use.
In another embodiment, step S220 can calculate the brightness value of the partial pixel (for example pixel of odd number sweep trace) of present picture frame, calculates the mean value of these partial pixel brightness values then, with the brightness value as present picture frame.In another embodiment, step S220 can add up the Luminance Distribution of all pixels in the present picture frame, and is maximum to be informed in a plurality of brightness ranges which pixel quantity.After filtering out pixel quantity maximum " brightness range ", just can obtain the representative luminance value (for example upper boundary values of this " brightness range ", lower border value or intermediate value) of this " brightness range ".Then, with this " representative luminance value " brightness value as present picture frame.
Next carry out step S230, with the two brightness value of more present picture frame and previous picture frame.In other words, step S230 judges that whether the difference of present picture frame and previous the two brightness value of picture frame is greater than threshold values k.In the present embodiment, described " previous picture frame " is adjacent with present picture frame on sequential; Also even " picture frame at present " is n picture frame, and then " previous picture frame " is n-1 picture frame.It is in another embodiment, described that " previous picture frame " can picture frame be non-conterminous on sequential with at present; Also even " picture frame at present " is n picture frame, and then " previous picture frame " may be to be n-2 picture frame, or n-3 picture frame, or other picture frame.
Suppose that at this brightness value of previous picture frame is the average brightness (AVG of n-1 picture frame
N-1).Step S230 can calculate the brightness value AVG of present picture frame
nBrightness value AVG with previous picture frame
N-1The absolute difference of the two also is | AVG
n-AVG
N-1|.If | AVG
n-AVG
N-1| greater than threshold values k, then carry out step S240.If | AVG
n-AVG
N-1| less than threshold values k, then carry out step S250.Above-mentioned threshold values k can look the demand difference and adjust.In the present embodiment, if the brightness value is the 8-bit data, then threshold values k can be between 50 to 250 (for example being 160).
When | AVG
n-AVG
N-1| during greater than threshold values k, picture frame mean flow rate difference is excessive before and after the expression, and system can automatically perform step S240, and with the brightness value of present picture frame as " mean flow rate eigenwert ".For example, calculation equation AVG
Total=AVG
n, also be about to the parameter A VG of representative " mean flow rate of a preceding x picture frame "
TotalReplace/be modified as the brightness value AVG of present picture frame
nTherefore, when film (picture) has clear and definite bright variation (for example picture brightness becomes 300nits suddenly by 1nits), backlight illumination can be followed picture brightness immediately and be done correction.
If | AVG
n-AVG
N-1| during less than threshold values k, picture frame mean flow rate difference is little before and after the expression, the meeting execution in step S250 of system, and the brightness value of a plurality of picture frames that present picture frame is previous with it is carried out " average calculating operation ", to obtain new " mean flow rate eigenwert " AVG
TotalAforementioned " average calculating operation " can calculate by present picture frame and start at, the mean value of the brightness value of a preceding x picture frame (x is an integer).For example, calculation equation AVG
Total=(AVG '
Total* x-AVG
N-x+ AVG
n)/x is to obtain new mean flow rate eigenwert AVG
Total, AVG ' wherein
TotalBe this original mean flow rate eigenwert, AVG
N-xBrightness value for previous x the picture frame of this present picture frame.That is to say, only need " mean flow rate of preceding x picture frame " AVG
N-xWith " the brightness value of picture frame at present " AVG
n, promptly can calculate new " mean flow rate of a preceding x picture frame " AVG
TotalIn another embodiment, wherein step S250 " average calculating operation " carried out can calculation equation AVG
Total=[AVG '
Total* (x-1)+AVG
n]/x is to obtain new mean flow rate eigenwert AVG
Total
Behind completing steps S240 or S250, then execution in step S260 adjusts backlight illumination with foundation mean flow rate eigenwert.After setting up backlight illumination, just backlight illumination after the adjustment of the image frame of display panel and backlight can be exported (step S270) synchronously.
Fig. 3 illustrates a kind of backlight brightness control devices according to the embodiment of the invention.Please refer to Fig. 2 and Fig. 3, backlight brightness control devices comprises first computing unit 310, second computing unit 320 and driver element 330.First computing unit 310 receives the pixel information D of present picture frame
Frame(step S210) is to calculate the brightness value (step S220) of present picture frame.This pixel data D
FrameCan do not provided by the time schedule controller in the display (illustrating), perhaps by the front stage circuits of time schedule controller, for example image is adjusted circuit (Image Scalar does not illustrate), and pixel data D is provided
FrameGive first computing unit 310.Aforementioned time schedule controller can see through source electrode driver (not illustrating) and gate pole driver (not illustrating), removes to drive display panel (not illustrating).Provide backlight illumination by backlight 340, display panel can be according to the control of aforementioned time schedule controller show image.
In the present embodiment, second computing unit 320 comprises displacement buffer unit 321, comparing unit 322 and output unit 323.Displacement buffer unit 321 has x level buffer REG
1～REG
x Displacement buffer unit 321 is controlled by the comparison signal C that comparing unit 322 is exported.If comparison signal C is first logical value (for example for logical zero), then with the first order buffer REG of this x level buffer
1Receive the present picture frame brightness value AVG that first computing unit 310 is exported
n, and transmit the brightness value step by step.If comparison signal C is second logical value (for example being logical one), then make each grade buffer REG of this x level buffer
1～REG
xReceive the present picture frame brightness value AVG that first computing unit 310 is exported simultaneously
nIn the present embodiment more in displacement buffer unit 321 allocating cache device REG
0With multiplexer MUX
0According to the control of comparison signal C, multiplexer MUX
0Can make the first order buffer REG of this x level buffer
1Directly receive the present picture frame brightness value AVG that first computing unit 310 is exported
n, perhaps see through buffer REG
0Receive the present picture frame brightness value AVG that first computing unit 310 is exported
nBuffer REG
0With multiplexer MUX
0Visual demand and omit it, and the present picture frame brightness value AVG that first computing unit 310 is exported
nDirectly export to first order buffer REG
1, comparing unit 322 and output unit 323.
Comparing unit 322 is coupled to displacement buffer unit 321, in order to receive and to calculate the brightness value AVG of present picture frame
nBrightness value AVG with previous picture frame
N-1The absolute difference of the two.If described absolute difference | AVG
n-AVG
N-1| less than threshold values k, then export first logical value as comparison signal C.If described absolute difference | AVG
n-AVG
N-1| greater than this threshold values k, then export second logical value as comparison signal C.As mentioned above, the comparison signal C that exported of comparing unit 322 can control displacement buffer unit 321.
In present embodiment, above-mentioned displacement buffer unit 321 comprises x buffer REG
1～REG
xAnd x-1 multiplexer MUX
2～MUX
xThe afterbody buffer REG of this x level buffer
xOutput terminal be coupled to output unit 323.I multiplexer MUX
iOutput terminal be coupled to i level buffer REG
iInput end.I multiplexer MUX
iFirst input end be coupled to i-1 level buffer REG
I-1Output terminal.Above-mentioned i is an integer, and 0＜i＜x+1.Each multiplexer MUX
1～MUX
xSecond input end all be coupled to first computing unit 310, to receive the brightness value AVG of present picture frame
nIn addition, each multiplexer MUX
1～MUX
xAll be controlled by comparison signal C.
In the present embodiment, above-mentioned comparing unit 322 comprises subtracter 324 and comparer 325.Subtracter 324 is coupled to displacement buffer unit 321 to receive the brightness value AVG of present picture frame
nBrightness value AVG with previous picture frame
N-1, and calculate the two absolute difference (| AVG
n-AVG
N-1|).Comparer 325 is coupled to subtracter 324.Comparer 325 more described absolute differences | AVG
n-AVG
N-1| with threshold values k, and export comparison signal C according to comparative result and give output unit 323 and multiplexer MUX
1～MUX
x
Fig. 4 be according to embodiment of the invention explanation display panel GTG brightness corresponding to the picture frame sequential chart of backlight illumination.As shown in Figure 4, its transverse axis express time.Above-listed among Fig. 4 (row) each square represents that the GTG brightness of display panel changed along with the time.Following each square represents that the backlight illumination of backlight 340 changes corresponding to the GTG brightness (being the pixel information of present picture frame) of display panel among Fig. 4.As shown in Figure 4, in time range T1, it is slowly that the GTG brightness of display panel changes.That is to say, in time range T1 | AVG
n-AVG
N-1| all less than threshold values k (threshold values k for example is 160), so comparing unit 322 output logics 0, changing with the GTG brightness of representing display panel is slowly.Therefore, output unit 323 is the afterbody buffer REG with this x level buffer in time range T1
xOutput AVG
N-xBrightness value AVG with present picture frame
nAverage computing and (be AVG at this
Total=(AVG '
Total* x-AVG
N-x+ AVG
nThe calculating of)/x is to export new mean flow rate eigenwert AVG
Total), so backlight 340 can be corresponding to the GTG brightness variation of display panel by bright deepening gradually.
Brightness changes film faster for GTG, perhaps when the input image is served as reasons the picture that secretly brightens at once, is dark picture (brightness is 1nits) as the image as shown in the display panel among Fig. 4 at n-1 picture frame, but jump into bright picture (brightness is 300nits) by dark picture suddenly at n picture frame, therefore in the time of n picture frame | AVG
n-AVG
N-1| greater than threshold values k, so comparing unit 322 output logics 1 as comparison signal C, alter a great deal with the GTG brightness of representing display panel.Be controlled by comparison signal C, output unit 323 is the brightness value AVG with present picture frame in the time of n picture frame
nAs new mean flow rate eigenwert AVG
TotalSimultaneously, displacement buffer unit 321 also is controlled by comparison signal C, and with buffer REG
1～REG
xStored contents all reset to the brightness value AVG of present picture frame
n
In sum, the foregoing description is because therefore the two brightness value of more present picture frame and previous picture frame can judge at any time that picture has or not clear and definite brightness variation.If the brightness of picture changes very not clear and definite, then with the brightness value AVG of previous a plurality of picture frames
N-x+1～AVG
nAverage computing, to obtain new mean flow rate eigenwert AVG
TotalOtherwise, very clear and definite if the brightness of picture changes, then with the brightness value AVG of present picture frame
nAs new mean flow rate eigenwert AVG
TotalTherefore, when film (picture) has clear and definite brightness to change (for example Fig. 4 is become the brightness 300nits of n picture frame suddenly by the brightness 1nits of n-1 picture frame), backlight illumination can be followed picture brightness in real time and be reacted.Also be, if the brightness of picture frame is excessive with the different difference of brightness of previous picture frame at present, promptly revise the mean flow rate eigenwert at once, make the GTG brightness of backlight illumination and display panel can show optimal brightness output at once, cause the factitious problem of brightness and solved the conventional dynamic backlight technology.
Though the present invention discloses as above with preferred embodiment; right its is not in order to limit the present invention; any those of ordinary skill in the art; without departing from the spirit and scope of the present invention; when can doing a little change and retouching, so protection scope of the present invention is when with being as the criterion that claim was defined.
Claims (21)
1. a backlight brightness control method is characterized in that, comprising:
Calculate the brightness value of a present picture frame;
The two brightness value of this a present picture frame and a previous picture frame relatively;
If the two absolute difference of the brightness value of the brightness value of this present picture frame and this previous picture frame is less than a threshold values, the brightness value of then will this present picture frame previous with it a plurality of picture frames is carried out an average calculating operation, to obtain a mean flow rate eigenwert;
If the two absolute difference of the brightness value of the brightness value of this present picture frame and this previous picture frame is greater than this threshold values, then with the brightness value of this present picture frame as this mean flow rate eigenwert; And
According to this mean flow rate eigenwert, adjust a backlight illumination.
2. backlight brightness control method as claimed in claim 1 is characterized in that, the step of wherein calculating the brightness value of this present picture frame comprises:
Calculate the brightness value of all pixels in this present picture frame; And
Calculate the mean value of those brightness values, with brightness value as this present picture frame.
3. backlight brightness control method as claimed in claim 1 is characterized in that, the step of wherein calculating the brightness value of this present picture frame comprises:
Calculate the brightness value of partial pixel in this present picture frame; And
Calculate the mean value of those brightness values, with brightness value as this present picture frame.
4. backlight brightness control method as claimed in claim 1 is characterized in that, the step of wherein calculating the brightness value of this present picture frame comprises:
Add up the Luminance Distribution of pixel in this present picture frame, maximum with the pixel quantity of knowing what person in a plurality of brightness ranges;
Obtain the representative luminance value of this maximum brightness range of pixel quantity; And
With the brightness value of this representative luminance value as this present picture frame.
5. backlight brightness control method as claimed in claim 1 is characterized in that, wherein this previous picture frame is adjacent with this present picture frame on sequential.
6. backlight brightness control method as claimed in claim 1 is characterized in that wherein this threshold values is between 50 to 250.
7. backlight brightness control method as claimed in claim 6 is characterized in that, wherein this threshold values is 160.
8. backlight brightness control method as claimed in claim 1 is characterized in that, wherein this average calculating operation is calculation equation AVG
Total=(AVG '
Total* x-AVG
N-x+ AVG
n)/x, wherein AVG
TotalBe this new mean flow rate eigenwert, AVG '
TotalBe this original mean flow rate eigenwert, AVG
nBe the brightness value of this present picture frame, AVG
N-xBe the brightness value of previous x the picture frame of this present picture frame, and x is an integer.
9. backlight brightness control method as claimed in claim 1 is characterized in that, wherein this average calculating operation is calculation equation AVG
Total=[AVG '
Total* (x-1)+AVG
n]/x, wherein AVG
TotalBe this new mean flow rate eigenwert, AVG '
TotalBe this original mean flow rate eigenwert, AVG
nBe the brightness value of this present picture frame, and x is an integer.
10. a backlight brightness control devices is characterized in that, comprising:
One first computing unit is in order to receive the pixel information of a present picture frame, to calculate the brightness value of this present picture frame;
One second computing unit is coupled to this first computing unit, in order to the two brightness value of relatively this a present picture frame and a previous picture frame; If the two absolute difference of the brightness value of the brightness value of this present picture frame and this previous picture frame is less than a threshold values, the brightness value of then will this present picture frame previous with it a plurality of picture frames is carried out an average calculating operation, to obtain a mean flow rate eigenwert; If the two absolute difference of the brightness value of the brightness value of this present picture frame and this previous picture frame is greater than this threshold values, then with the brightness value of this present picture frame as this mean flow rate eigenwert; And
One driver element is coupled between this second computing unit and the backlight, in order to driving this backlight so that a backlight illumination to be provided, and adjusts this backlight illumination according to this mean flow rate eigenwert.
11. backlight brightness control devices as claimed in claim 10 is characterized in that, wherein this first computing unit removes to calculate the brightness value of all pixels according to pixel information in this present picture frame; And the mean value that calculates those brightness values, with brightness value as this present picture frame.
12. backlight brightness control devices as claimed in claim 10 is characterized in that, wherein this first computing unit removes the brightness value of calculating section pixel according to pixel information in this present picture frame; And the mean value that calculates those brightness values, with brightness value as this present picture frame.
13. backlight brightness control devices as claimed in claim 10 is characterized in that, wherein this first computing unit is added up the Luminance Distribution of pixel in this present picture frame, and is maximum with the pixel quantity of knowing what person in a plurality of brightness ranges; Obtain the representative luminance value of this maximum brightness range of pixel quantity; And with the brightness value of this representative luminance value as this present picture frame.
14. backlight brightness control devices as claimed in claim 10 is characterized in that, wherein this previous picture frame is adjacent with this present picture frame on sequential.
15. backlight brightness control devices as claimed in claim 10 is characterized in that, wherein this threshold values is between 50 to 250.
16. backlight brightness control devices as claimed in claim 15 is characterized in that, wherein this threshold values is 160.
17. backlight brightness control devices as claimed in claim 10 is characterized in that, wherein this average calculating operation is calculation equation AVG
Total=(AVG '
Total* x-AVG
N-x+ AVG
n)/x, wherein AVG
TotalBe this new mean flow rate eigenwert, AVG '
TotalBe this original mean flow rate eigenwert, AVG
nBe the brightness value of this present picture frame, AVG
N-xBe the brightness value of previous x the picture frame of this present picture frame, and x is an integer.
18. backlight brightness control devices as claimed in claim 10 is characterized in that, wherein this average calculating operation is calculation equation AVG
Total=[AVG '
Total* (x-1)+AVG
n]/x, wherein AVG
TotalBe this new mean flow rate eigenwert, AVG '
TotalBe this original mean flow rate eigenwert, AVG
nBe the brightness value of this present picture frame, and x is an integer.
19. backlight brightness control devices as claimed in claim 10 is characterized in that, wherein this second computing unit comprises:
One displacement buffer unit has x level buffer, wherein if a comparison signal is first logical value, then the first order buffer of this x level buffer is received the brightness value of this present picture frame, and transmits the brightness value step by step; If this comparison signal is second logical value, then make each grade buffer of this x level buffer receive the brightness value of this present picture frame, wherein x is an integer;
One comparing unit, be coupled to this displacement buffer unit, in order to the two absolute difference of the brightness value of the brightness value that receives and calculate this present picture frame and this previous picture frame, less than this threshold values, then exporting this comparison signal is first logical value as if described absolute difference; If described absolute difference is greater than this threshold values, then exporting this comparison signal is second logical value; And
One output unit is coupled to this displacement buffer unit and this comparing unit, wherein if this comparison signal is first logical value, then the output of the afterbody buffer of this x level buffer is carried out AVG with the brightness value of this present picture frame
Total=(AVG '
Total* x-AVG
N-x+ AVG
nThe calculating of)/x is to export new this mean flow rate eigenwert AVG
Total, AVG ' wherein
TotalBe this original mean flow rate eigenwert, AVG
nBe the brightness value of this present picture frame, AVG
N-xOutput for the afterbody buffer of this x level buffer; If this comparison signal is second logical value, then with the brightness value of this present picture frame as this mean flow rate eigenwert.
20. backlight brightness control devices as claimed in claim 19 is characterized in that, wherein this displacement buffer unit comprises:
X buffer REG
i, REG wherein
iThe i level buffer of representing this x level buffer, i are integer and 0＜i＜x+1, and the afterbody buffer REG of this x level buffer
xOutput terminal be coupled to this output unit; And
X-1 multiplexer MUX
i, i multiplexer MUX wherein
iOutput terminal be coupled to i level buffer REG
iInput end, i multiplexer MUX
iFirst input end be coupled to i-1 level buffer REG
I-1Output terminal, i multiplexer MUX
iSecond input end receive the brightness value of this present picture frame, and each multiplexer is controlled by this comparison signal.
21. backlight brightness control devices as claimed in claim 19 is characterized in that, wherein this comparing unit comprises:
One subtracter is coupled to this displacement buffer unit with the brightness value that receives this present picture frame brightness value with this previous picture frame, and calculates the absolute difference of the two; And
One comparer is coupled to this subtracter, in order to more described absolute difference and this threshold values, and exports this comparison signal according to comparative result.
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|---|---|---|---|
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| CN103973855A (en) * | 2013-01-28 | 2014-08-06 | 深圳富泰宏精密工业有限公司 | Mobile phone backlight brightness fine adjustment system and method |
| CN105139814A (en) * | 2015-06-05 | 2015-12-09 | 深圳创维－Rgb电子有限公司 | Liquid crystal display and display method thereof |
| CN106793038A (en) * | 2016-12-28 | 2017-05-31 | 努比亚技术有限公司 | Power consumption management-control method and mobile terminal based on CABC |
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| CN100583214C (en) * | 2006-12-31 | 2010-01-20 | 深圳Tcl工业研究院有限公司 | LCD television set backlight control system and method |
| CN101271208B (en) * | 2007-03-19 | 2010-04-21 | 钰瀚科技股份有限公司 | Dynamic backlight control method of LCD device |
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