CN100483218C - Adoptive back-light adjusting system and method - Google Patents
Adoptive back-light adjusting system and method Download PDFInfo
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- CN100483218C CN100483218C CNB2006101317885A CN200610131788A CN100483218C CN 100483218 C CN100483218 C CN 100483218C CN B2006101317885 A CNB2006101317885 A CN B2006101317885A CN 200610131788 A CN200610131788 A CN 200610131788A CN 100483218 C CN100483218 C CN 100483218C
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Abstract
An adaptive back light modulating system and the method include the brightness matching distribution device, the brightness compensation device, the image frame adjusting device, the back light controlling device and a back light module. The brightness matching distribution device can generate the brightness matching distribution value of every image frame. The brightness compensation device computes the dark ratio and the brightness index value of the image frame according to the brightness matching distribution value to generate the brightness compensation signal. The image frame adjusting device adjusts the brightness of the image frame according to the brightness compensation signal. The back light controlling device can renew the brightness index value according to the brightness index value and the brightness matching distribution to generate the back light controlling signal corresponding to the present image frame. The back controlling device adjust the back light of the back light module according to the back light controlling signal to make the brightness of the image frame match with the luminescent curve of the back light module.
Description
Technical field
The invention relates to a kind of modulation system and modulating method thereof, particularly relevant for a kind of adaptive type modulation backlight system and modulating method thereof.
Background technology
LCD is divided into penetrating LCD, reflective liquid-crystal display usually and partly penetrates/semi-reflecting liquid-crystal display, and penetrating LCD is provided with backlight module (Backlight Module).The light emitting source that backlight module uses is broadly divided into cold cathode fluorescent lamp (Cold Cathode Fluorescent Lamp, CCFL), hot cathode fluorescent lamp, light-emittingdiode or other EL parts (Electro LuminescentDevice, EL device), present main flow is cold cathode fluorescent lamp (CCFL).
Because LCD has significant light leak effect in the situation of dark attitude (that is the GTG value is lower).And the demand of constantly growing up along with the size of display panels with and application popularization in television system, cause the appreciative perspective of display to require computer system application raising more in the past a lot of, so there is more and more strict requirement at each visual angle in the phenomenon of dark attitude light leak.In addition, promote the ornamental quality of panel, need immediately dynamically to adjust backlight in order to promote dynamic contrast.Yet factors such as environment light source are often only considered in the traditional backlight adjustment, and ignore the problems referred to above, therefore traditional adjustment mode makes LCD produce the phenomenon of flicker easily, causes non-uniform light to make the picture image quality instability of LCD on LCD screen.
Therefore need a kind of modulation backlight of development system, to promote the quality of display picture.
Summary of the invention
An object of the present invention is to provide a kind of modulation system backlight and modulating method thereof, the light-source brightness that utilizes luminance compensation signal adaptive ground to adjust the brightness of frames images and utilize backlight control signal adjusting backlight module, the image that frames images is presented on liquid crystal indicator is kept consistance, and conserver power source, and then the temperature of reduction liquid crystal indicator, prolong its term of life.
Another object of the present invention provides a kind of modulation system backlight and modulating method thereof, the dark attitude ratio value of the pixel of calculating chart frame, and the contrast of raising frames images is to improve the picture quality of liquid crystal indicator.
According to above-mentioned purpose, the present invention proposes a kind of modulation system backlight and modulating method thereof, and modulation backlight system mainly comprises brightness matching distribution device, luminance compensation module, image frame adjusting device, backlight control apparatus and backlight module.The brightness matching distribution device receives the complex image frame, and in order to produce the brightness matching distribution value corresponding to each frames images, wherein each frames images has a plurality of pixels.The luminance compensation module is connected in this brightness matching distribution device, this luminance compensation module is calculated the dark attitude ratio value of whole pixels in this present frames images according to the brightness matching distribution value of present frames images, and utilize this dark attitude ratio value to calculate the brightness index value of this present frames images, with according to this dark attitude ratio value and the generation of this brightness index value luminance compensation signal corresponding to this present frames images.Image frame adjusting device is connected in the luminance compensation module, according to the brightness of adjusting pixel in the present frames images from the luminance compensation signal of luminance compensation module.
Backlight control apparatus is connected to this brightness matching distribution device and this luminance compensation module, this backlight control apparatus is according to the brightness index value of previous frames images and the brightness matching distribution value of this present frames images, to upgrade the brightness index value of this present frames images, to produce backlight control signal corresponding to this present frames images.Backlight module is connected to this backlight control apparatus, and this backlight control apparatus is adjusted the backlight illumination of backlight module according to the backlight control signal that produces, and makes the brightness of present frames images and the luminosity curve of backlight module mate adaptively.
According to above-mentioned, the brightness index value of the brightness matching distribution curve of frames images image and previous backlight illumination luminosity curve can be obtained the parameter of luminance compensation signal through the processing of luminance compensation module, this parameter is used for the image data of correction image frame, with the image consistance of compensate for backlight module in the modulation process and the demand that improves image contrast.Simultaneously the brightness index value of the brightness matching distribution curve of frames images image and previous backlight illumination luminosity curve can be obtained the parameter of backlight control signal through the processing of backlight control apparatus, this parameter is used to produce new brightness index value, with the modulation backlight module.Therefore the present invention utilizes these two kinds of parameters to adjust the frames images image adaptively and will backlightly be incident upon on the display device of this frames images image of demonstration, make the image that presents on the liquid crystal indicator keep consistance, improve picture quality, and conserver power source reduces the working temperature of LCD.
Modulating method backlight of the present invention at first receives the complex image frame; Then produce the brightness matching distribution value corresponding to each frames images, wherein each frames images has a plurality of pixels; Calculate the dark attitude ratio value of pixel in the present frames images then according to the brightness matching distribution value of present frames images, and utilize this dark attitude ratio value to calculate the brightness index value of present frames images, to produce luminance compensation signal according to dark attitude ratio value and brightness index value corresponding to present frames images.
Afterwards, according to the brightness of adjusting these pixels in this present frames images from the luminance compensation signal of this luminance compensation module; Then according to the brightness index value of previous frames images and the brightness matching distribution value of present frames images, to upgrade the brightness index value of present frames images, to produce backlight control signal corresponding to present frames images; Last backlight control signal according to generation is adjusted the backlight of this backlight module, makes the brightness of present frames images and the luminosity curve of backlight module mate adaptively mutually.
Modulation system backlight of the present invention and modulating method thereof utilize luminance compensation signal adaptive ground to adjust the brightness of frames images and utilize backlight control signal to regulate the light-source brightness of backlight module, the image that frames images is presented on liquid crystal indicator is kept consistance, and conserver power source, and then the temperature of reduction liquid crystal indicator, prolong its term of life.
Description of drawings
The 1st illustrates the calcspar according to modulation backlight system among one of the present invention embodiment.
2A illustrates the synoptic diagram according to the brightness matching distribution value of a frames images among one of the present invention embodiment.
2B illustrates the synoptic diagram according to dark attitude compensated curve among one of the present invention embodiment.
The gamma controller that 2C illustrates according to the present invention the 1st figure utilizes the dark attitude compensated curve of 2B figure to produce the synoptic diagram of new dark attitude compensated curve.
The 3rd illustrates the detailed block diagram according to the frames images detection module of the present invention in the 1st figure backlight control apparatus.
4A illustrates the synoptic diagram that with the gap ratio between this present brightness index value and this object brightness index value present brightness index value progressively is adjusted to this object brightness index value according to this frames images detection module among one of the present invention embodiment.
4B illustrates the synoptic diagram that present brightness index value progressively is adjusted to this object brightness index value with fixing ratio according to this frames images detection module among one of the present invention embodiment.
The 5th illustrates according to the synoptic diagram that can be different frames images among one of the present invention embodiment in generation object brightness and the present brightness of decision.
6A illustrates the synoptic diagram according to question blank among one of the present invention embodiment.
6B illustrates the synoptic diagram according to the waveform output of frequency conversion form among one of the present invention embodiment.
The 7th illustrates the process flow diagram according to modulating method backlight of the present invention.
Embodiment
The invention provides a kind of modulation system backlight and modulating method thereof, the light-source brightness that utilizes luminance compensation signal adaptive ground to adjust the brightness of frames images and utilize backlight control signal adjusting backlight module, the image that frames images is presented on display device is kept consistance, and save the power supply that display device consumes, and then reduce its working temperature, prolong the term of life of display device.In addition, the dark attitude ratio value of the pixel of modulation system-computed frames images backlight, the contrast of raising frames images is to improve the picture quality of display device.Modulation system backlight of the present invention and modulating method thereof are applicable to the backlight module of LCD (LCD) and LCD TV, or are applied to have the display device of backlight module.
The 1st illustrates the calcspar according to modulation backlight system among one of the present invention embodiment.Modulation backlight system 100 is applicable to liquid crystal indicator, mainly comprises brightness matching distribution device 102, luminance compensation module 104, image frame adjusting device 106, backlight control apparatus 108 and backlight module 110.Brightness matching distribution device 102 receives the complex image frame, and in order to produce brightness matching distribution (Intensity-pair Distribution) value corresponding to each frames images, wherein each frames images has a plurality of pixels.Luminance compensation module 104 is connected in brightness matching distribution device 102, this luminance compensation module 104 is calculated the dark attitude ratio value of whole pixels in the present frames images according to the brightness matching distribution value of present frames images, and utilize this dark attitude ratio value to calculate the brightness index value of present frames images, to produce luminance compensation signal by dark attitude ratio value and brightness index value 118b corresponding to present frames images.Image frame adjusting device 106 is connected in luminance compensation module 104, according to adjust all brightness of pixel in the present frames images from the luminance compensation signal of this luminance compensation module.In the preferred embodiment of the present invention with the data storing of luminance compensation signal in the luminance compensation storage device 112, and the luminance compensation data can be expressed as the luminance compensation curve.
Backlight control apparatus 108 is connected to brightness matching distribution device 102 and luminance compensation module 104, this backlight control apparatus 108 is according to the brightness index value 118a of previous frames images and the brightness matching distribution value of present frames images, to upgrade the brightness index value 118b of present frames images, to produce backlight control signal corresponding to present frames images.Backlight module 110 is connected to backlight control apparatus 108, the backlight control signal that these backlight control apparatus 108 foundations produce is adjusted the backlight illumination of this backlight module 100, makes the brightness of present frames images and the luminosity curve of backlight module 100 mate adaptively.
According to above-mentioned, modulation backlight of the present invention system 100 can obtain the brightness index value 118b of the brightness matching distribution curve of frames images image and previous backlight illumination luminosity curve through the processing of luminance compensation module 104 parameter of luminance compensation signal, this parameter is used for the image data of correction image frame, with the image consistance of compensate for backlight module 100 in the modulation process and the demand that improves image contrast.Simultaneously the brightness index value 118b of the brightness matching distribution curve of frames images image and previous backlight illumination luminosity curve can be obtained the parameter of backlight control signal through the processing of backlight control apparatus 108, this parameter is used to produce new brightness index value 118a, with the modulation backlight module.Therefore the present invention utilizes these two kinds of parameters to adjust the frames images image adaptively and will backlightly be incident upon on the display device 114 of this frames images image of demonstration, make the image that presents on the display device 114 keep consistance, improve picture quality, and conserver power source reduces the working temperature of display device 114.
2A illustrates the synoptic diagram according to the brightness matching distribution curve of a frames images among one of the present invention embodiment.The transverse axis coordinate of brightness matching distribution curve is represented the GTG value, and the longitudinal axis is represented the pixel quantity corresponding to this GTG value.Dark attitude ratio value (Black Ratio in the luminance compensation module, BR) be both ratio of the total number of pixel (o) (m/o) that is illustrated in number of pixels (m) that GTG value in each frames images is lower than a reference value (n) and this frames images multiply by the GTG resolution (be expressed as k, its value for example can be 255 or positive integer arbitrarily).
Furthermore, brightness index value of the present invention multiply by the summation that first weighted value and this dark attitude ratio value multiply by second weighted value for pixel gray level value maximum in each frames images.That is the GTG value that obtains bright spot when the brightness matching distribution value of calculating each frames images is k, definition brightness index value (Brightness Index, BI) be BI=q * k+ (1-q) * BR, wherein q is adjustable first weighted value, positive integer between 0～1 or arbitrarily for example, and (1-q) be second weighted value.This brightness index value is in order to the proportionate relationship of the pixel of representing dark attitude of each frames images and bright attitude, with as revising image data and adjusting parameter backlight.
2B illustrates the synoptic diagram according to dark attitude compensated curve among one of the present invention embodiment.In Shu embodiment, change in order to compensate because of backlight illumination downgrades the GTG value that is caused, the present invention system utilizes the method for the brightness curve of correction image frame to be compensated, shown in 2B figure.GTG value before the transverse axis coordinate of brightness curve 200 is represented to change, the longitudinal axis is represented corresponding to GTG value after the change of GTG value before the change, that is be defined as R_BR with dark attitude ratio value BR multiplication by constants R (positive integer arbitrarily), with its hoist point as the GTG value, make (n+R_BR) that is converted to longitudinal axis GTG value at the n of transverse axis GTG value, and its transfer point is connected with 0 and 255 points (or positive integer) arbitrarily respectively in the mode of linear extension, to produce a new dark attitude compensated curve.It should be noted dotted line 202 expression adjustment original dark attitude compensated curve 202 before backlight.
The gamma controller 116 that 2C illustrates according to the present invention the 1st figure utilizes the dark attitude compensated curve of 2B figure to produce the synoptic diagram of new dark attitude compensated curve.In the 1st figure, modulation backlight system 100 comprises the gamma controller 116 that is connected in luminance compensation module 104, the luminance compensation signal that gamma controller 116 receives from this luminance compensation module 104, then this luminance compensation signal times is adjusted parameter and gamma signal 204 be multiply by second with first and adjust parameter and do summation and produce new dark attitude compensated curve 206, with luminance compensation signal as luminance compensation module 104.Also be about to original gamma curve and be multiplied by (1-p) and add that then dark attitude compensated curve is multiplied by p, wherein adjustable parameters p system between 0～1, or positive integer arbitrarily.
With reference to the 1st figure and the 3rd figure, the 3rd illustrates the detailed block diagram according to the frames images detection module 108a of the present invention in the 1st figure backlight control apparatus.Frames images detection module 108a is connected in brightness matching distribution device 102, utilize the brightness matching distribution value of present frames images and both pairing distribution differences of brightness matching distribution value of previous frames images, and will match the brightness matching distribution value of distribution difference divided by this present frames images, with detect this present frames images and this previous frames images between the frames images otherness, judge whether the brightness index value 118a of this present frames images is directly changed to the object brightness index value according to this frames images otherness.In preferred embodiment of the present invention, the brightness index value 118a of frames images and the brightness index value 118b of previous frames images are stored in the index data storage device 118 at present.
Particularly, the change of background testing mechanism of frames images system supposes that according to the brightness matching distribution figure of front/rear two frames images the brightness of n page or leaf and n+1 page or leaf is respectively distribution trend figure:
Hn(0)，Hn(1)，...，Hn(a)；
Hn+1 (0), Hn+1 (1) ..., Hn+1 (a); Wherein a is a positive integer, for example can be above-mentioned GTG value resolution k.
Be expressed as the summation D_S of pairing distribution difference.
Be expressed as the overall brightness matching distribution value and S.
According to above-mentioned, frames images otherness hist_diff_ratio=D_S/S, when the frames images otherness greater than a threshold value (Threshold Value), the brightness index value of present frames images is directly changed to the object brightness index value, for example on the quick border that changes of scene, often also be accompanied by significant scintillation, can once be adjusted to final brightness with backlight this moment.Anti-adopts the change brightness index value of walking unhurriedly in level and smooth scene, discovers scintillation to avoid human eye.
Continue with reference to the 1st figure, modulation backlight of the present invention system 100 also comprises a contrast comparison module 108b, be connected in brightness matching distribution device 102, utilize the brightness matching distribution value of present frames images and this previous frames images to calculate the contrast ratio of this present frames images and this previous frames images respectively, and the contrast ratio of this two frames images relatively is to judge whether to adjust backlight according to this comparative result.Because human eye is comparatively sharp to " contrast ", and can't discover the rough difference of absolute brightness, therefore when the contrast unanimity of frames images, will keep original brightness, does not do any change, causes picture to flash to avoid overall brightness to change.Particularly, the contrast maximum brightness that is defined as each frames images deducts minimum brightness: CR=max (Y) min (Y).When the difference value of the CR_n of two pages of frames images in front and back (frames images N and frames images N+1) and CR_n+1 less than threshold value CR_th, represent this contrast of two pages much at one, it is backlight that do not adjust then adjustment backlight, anti-this moment.
In an embodiment of the present invention, inequality when the brightness index value and the object brightness index value of present frames images, this frames images detection module progressively is adjusted to this object brightness index value with the gap ratio of this frames images otherness with present brightness index value.Each change amplitude is defined as BR_INC, and it can comply with (a) picture gap ratio; (b) luminance difference is apart from ratio; And (c) fixed proportion, illustrate as follows:
(a) picture gap ratio:
The picture gap definition is frames images otherness hist_diff_ratio herein.When the picture diversity factor is K, be limited to a fixed proportion value c in each change, meaning is promptly with the spacing of c * K as each variation.If the brightness index is BR_curr at present, the object brightness index is BR_dest, and then the brightness index then is that BR_curr+c * K is until BR_dest next time.
For example brightness at present is 100, and object brightness is 127, and the picture diversity factor is 20, if fixed proportion value c is 0.5, then for the first time after changing, the brightness index is 100+20 * 0.5=110; Change for the second time: 110+20 * 0.5=120; Change for the third time: 120+20 * 0.5=130 127, then export 127.
If object brightness is lower than present brightness, then brightness descends gradually, and for example brightness at present is 100, and object brightness is 87, and the picture diversity factor is 20, and ratio value is 0.5, then changes for the first time: 100-20 * 0.5=90; Change for the second time: 90-20 * 0.5=80＜87, then export 87.
(b) luminance difference is apart from ratio:
Shown in 4A figure, it illustrates the synoptic diagram that with the gap ratio between present brightness index value and object brightness index value present brightness index value progressively is adjusted to this object brightness index value according to frames images detection module among one of the present invention embodiment.Inequality when the brightness index value and the object brightness index value of present frames images, the frames images detection module progressively is adjusted to this object brightness index value with the gap ratio between present brightness index value and this object brightness index value with present brightness index value.
When present brightness and object brightness gap are bigger, jump amplitude at every turn is bigger, and its change amplitude then is multiplied by fixed proportion value c for (Br_destBr_curr), for example: c=0.5, brightness at present=100, object brightness is 150, changes for the first time: 100+0.5 * (150-100)=125; Change for the second time: 125+0.5 * (150-125)=138; Change for the third time: 138+0.5 * (150-138)=144.
(c) fixed proportion:
Shown in 4B figure, it illustrates the synoptic diagram that present brightness index value progressively is adjusted to the object brightness index value with fixing ratio according to frames images detection module among one of the present invention embodiment.Inequality when the brightness index value and the object brightness index value of present frames images, this frames images detection module progressively is adjusted to the object brightness index value with present brightness index value with fixing ratio.
No matter the picture diversity factor why, and fixedly resize ratio is k, until reaching final brightness BR_dest.For example, present brightness BR_curr=100, object brightness BR_dest=117, resize ratio c=10, change: 100+10=110 for the first time; Change for the second time: 1,10+,10=,120 117, then export 117.
The 5th illustrates according to the synoptic diagram that can be different frames images among one of the present invention embodiment in generation object brightness and the present brightness of decision.Can be the frames images of different page numbers in generation object brightness and the present brightness of decision, switching the letter formula when the decision object brightness is after F_dest switches letter formula F_curr with brightness at present, decide last output brightness index every the F_dest page number, and brightness at present changes to new brightness index behind every F_chg (the brightness index of expression page number is along with the change procedure of time shaft) page number, meaning is promptly when the scene acute variation, but the brightness Direct Transform is the object brightness index at present, otherwise then changes the brightness index gradually.
6A illustrates the synoptic diagram according to question blank among one of the present invention embodiment.Modulation backlight of the present invention system also comprises a question blank, utilizes the brightness index value that calculates to inquire about this question blank, adjusts the pulse wave width modulation signal to produce low level parameter and high levle parameter, to adjust the light-source brightness of backlight module.Particularly, the present invention is with brightness search index one question blank (Look-up Table, LUT), via the aforementioned brightness index that calculates, check in two independent coefficient Pa and Pb, control signal generator 600 is the modulating signal of two coefficient array outputs, one variable-width according to this, and wherein Pa represents that signal level is high time span, and Pb represents that accurate position is low time span.Backlight module 110 can be adjusted light-source brightness according to the portfolio ratio of Pa and Pb.In preferred embodiment, control signal generator 600 for example can be the control circuit of counter (Counter) and comparer (Comparator) element composition.
Among another embodiment, the brightness index value for example can be a value that changes in time, the combination of representing Pa/Pb simultaneously can change in time, and then the waveform that forms the frequency conversion form is exported, to reach the purpose that dynamic backlight is adjusted, shown in 6B figure, it illustrates the synoptic diagram according to the waveform output of frequency conversion form among one of the present invention embodiment.
The 7th illustrates the method flow diagram according to modulation backlight among one of the present invention embodiment.At first receive the complex image frame at step S700; Then in the brightness matching distribution value of step S702 generation corresponding to each frames images, wherein each frames images has a plurality of pixels; Calculate the dark attitude ratio value of pixel in the present frames images then according to the brightness matching distribution value of present frames images at step S704, and utilize this dark attitude ratio value to calculate the brightness index value of present frames images, to produce luminance compensation signal by dark attitude ratio value and brightness index value corresponding to present frames images.
Afterwards at step S706, according to the brightness of adjusting pixel in the present frames images from the luminance compensation signal of luminance compensation module; Then in the brightness index value of the previous frames images of step S708 foundation and the brightness matching distribution value of present frames images, to upgrade the brightness index value of this present frames images, to produce backlight control signal corresponding to present frames images; At last adjust the backlight illumination of backlight module according to the backlight control signal that produces, make the luminosity curve of brightness and backlight module of present frames images mate adaptively mutually at step S710.
Modulation system backlight of the present invention and modulating method thereof utilize luminance compensation signal adaptive ground to adjust the brightness of frames images and utilize backlight control signal to regulate the light-source brightness of backlight module, the image that frames images is presented on liquid crystal indicator is kept consistance, and conserver power source, and then the temperature of reduction liquid crystal indicator, prolong its term of life.And the dark attitude ratio value of the pixel of modulation system-computed frames images backlight is used the contrast that strengthens frames images, improves the image quality of liquid crystal indicator.
Though the present invention discloses as above with preferred embodiment; right its is not in order to limit the present invention; anyly have the knack of this skill person; without departing from the spirit and scope of the present invention; when can being used for a variety of modifications and variations, so protection scope of the present invention is as the criterion when looking accompanying the claim person of defining.
Claims (17)
1. an adaptive type modulation backlight system is applicable to liquid crystal indicator, and this modulation backlight system comprises at least:
One brightness matching distribution device receives the complex image frame, and in order to produce the brightness matching distribution value corresponding to each of these frames images, wherein each of these frames images has a plurality of pixels;
One luminance compensation module, be connected in this brightness matching distribution device, this luminance compensation module is calculated the dark attitude ratio value of pixel described in this present frames images according to the brightness matching distribution value of present frames images, and utilize this dark attitude ratio value to calculate the brightness index value of this present frames images, with according to this dark attitude ratio value and the generation of this brightness index value luminance compensation signal corresponding to this present frames images;
One image frame adjusting device is connected in this luminance compensation module, according to the brightness of adjusting pixel described in this present frames images from the luminance compensation signal of this luminance compensation module;
One backlight control apparatus, be connected to this brightness matching distribution device and this luminance compensation module, this backlight control apparatus is according to the brightness index value of previous frames images and the brightness matching distribution value of this present frames images, to upgrade the brightness index value of this present frames images, to produce backlight control signal corresponding to this present frames images; And
One backlight module is connected in this backlight control apparatus, and this backlight control apparatus is adjusted the backlight of this backlight module according to the backlight control signal that produces, and makes the brightness of this present frames images and the mutual adaptability of the luminosity curve of this backlight module mate,
Wherein the dark attitude ratio value of this luminance compensation module multiply by the GTG resolution for the ratio that GTG value in each frames images is lower than the total number of pixel of the number of pixels of a reference value and this frames images, and
Wherein this brightness index value of this luminance compensation module multiply by the summation that first weighted value and this dark attitude ratio value multiply by second weighted value for pixel gray level value maximum in each frames images.
2. modulation backlight as claimed in claim 1 system, also comprise a gamma controller, be connected in this luminance compensation module, reception is from the luminance compensation signal of this luminance compensation module, this gamma controller is adjusted parameter with this luminance compensation signal times with first and the gamma signal times is adjusted parameter with second sue for peace, to adjust the luminance compensation signal from this luminance compensation module.
3. modulation backlight as claimed in claim 1 system, also comprise a frames images detection module, be connected in this brightness matching distribution device, utilize the brightness matching distribution value of this present frames images and both pairing distribution differences of brightness matching distribution value of this previous frames images, and will match the brightness matching distribution value of distribution difference divided by this present frames images, to detect the frames images otherness between this present frames images and this previous frames images, judge whether the brightness index value of this present frames images is changed to the object brightness index value according to this frames images otherness.
4. modulation backlight as claimed in claim 3 system, inequality when brightness index value and this object brightness index value of this present frames images, this frames images detection module progressively is adjusted to this object brightness index value with the gap ratio of this frames images otherness with present brightness index value.
5. modulation backlight as claimed in claim 3 system, inequality when brightness index value and this object brightness index value of this present frames images, this frames images detection module progressively is adjusted to this object brightness index value with the gap ratio between this present brightness index value and this object brightness index value with present brightness index value.
6. modulation backlight as claimed in claim 3 system, inequality when brightness index value and this object brightness index value of this present frames images, this frames images detection module progressively is adjusted to this object brightness index value with present brightness index value with fixing ratio.
7. modulation backlight as claimed in claim 1 system, also comprise a contrast comparison module, be connected in this brightness matching distribution device, utilize the brightness matching distribution value of this present frames images and this previous frames images to calculate the contrast ratio of this present frames images and this previous frames images respectively, and the contrast ratio of this two frames images relatively is to judge whether to adjust backlight according to this comparative result.
8 modulation backlight as claimed in claim 1 systems, wherein producing object brightness is frames images inequality with the present brightness of decision.
9. modulation backlight as claimed in claim 1 system, also comprise a question blank, the brightness index value that utilization calculates is inquired about this question blank, adjusts the pulse wave width modulation signal to produce low level parameter and high levle parameter, to adjust the light-source brightness of backlight module.
10. the modulating method of an adaptive type back light system, this modulating method comprises the following step:
Receive the complex image frame;
Generation is corresponding to each brightness matching distribution value of these frames images, and wherein each of these frames images has a plurality of pixels;
Calculate the dark attitude ratio value of these pixels in this present frames images according to the brightness matching distribution value of present frames images, and utilize this dark attitude ratio value to calculate the brightness index value of this present frames images, to produce luminance compensation signal by this dark attitude ratio value and this brightness index value corresponding to this present frames images;
According to the brightness of adjusting these pixels in this present frames images from the luminance compensation signal of luminance compensation module;
According to the brightness index value of previous frames images and the brightness matching distribution value of this present frames images, to upgrade the brightness index value of this present frames images, to produce backlight control signal corresponding to this present frames images; And
Adjust the backlight of backlight module according to backlight control signal, make the brightness of this present frames images and the luminosity curve of this backlight module match each other,
Wherein this dark attitude ratio value multiply by the GTG resolution for the ratio that GTG value in each frames images is lower than the total number of pixel of the number of pixels of a reference value and this frames images, and
Wherein this brightness index value multiply by the summation that first weighted value and this dark attitude ratio value multiply by second weighted value for pixel gray level value maximum in each frames images.
11. modulating method as claimed in claim 10 also comprises this luminance compensation signal times is sued for peace with the second adjustment parameter with the first adjustment parameter and with the gamma signal times, to adjust the luminance compensation signal from this luminance compensation module.
12. modulating method as claimed in claim 10, also comprise the brightness matching distribution value of utilizing this present frames images and both pairing distribution differences of brightness matching distribution value of this previous frames images, and will match the brightness matching distribution value of distribution difference divided by this present frames images, with detect this present frames images and this previous frames images between the frames images otherness, judge whether the brightness index value of this present frames images is changed to the object brightness index value according to this frames images otherness.
13. modulating method as claimed in claim 12, inequality when brightness index value and this object brightness index value of this present frames images, the frames images detection module progressively is adjusted to this object brightness index value with the gap ratio of this frames images otherness with present brightness index value.
14. modulating method as claimed in claim 12, inequality when brightness index value and this object brightness index value of this present frames images, the frames images detection module progressively is adjusted to this object brightness index value with the gap ratio between this present brightness index value and this object brightness index value with present brightness index value.
15. modulating method as claimed in claim 12, inequality when brightness index value and this object brightness index value of this present frames images, the frames images detection module progressively is adjusted to this object brightness index value with present brightness index value with fixing ratio.
16. modulating method as claimed in claim 10, also comprise the brightness matching distribution value of utilizing this present frames images and this previous frames images and calculate the contrast ratio of this present frames images and this previous frames images respectively, and the contrast ratio of this two frames images relatively is to judge whether to adjust backlight according to this comparative result.
17. modulating method as claimed in claim 10, wherein producing object brightness is frames images inequality with the present brightness of decision.
18. modulating method as claimed in claim 10 also comprises and utilizes the brightness index value that calculates to inquire about a question blank, adjusts the pulse wave width modulation signal to produce low level parameter and high levle parameter, to adjust the light-source brightness of backlight module.
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| CNB2006101317885A CN100483218C (en) | 2006-10-12 | 2006-10-12 | Adoptive back-light adjusting system and method |
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| CN101295467B (en) * | 2007-04-29 | 2011-06-01 | 瑞昱半导体股份有限公司 | Contrast control device and control method thereof |
| US20080266235A1 (en) * | 2007-04-30 | 2008-10-30 | Hupman Paul M | Methods and systems for adjusting backlight luminance |
| TW200912838A (en) * | 2007-07-04 | 2009-03-16 | Koninkl Philips Electronics Nv | Method and system for providing an exercise goal |
| CN101399909B (en) * | 2007-09-28 | 2011-05-04 | 奇景光电股份有限公司 | Adaptive image regulating method and image processing device using the method |
| JP4840393B2 (en) * | 2008-04-11 | 2011-12-21 | ソニー株式会社 | Display control apparatus and method, and program |
| US8289265B2 (en) * | 2008-07-15 | 2012-10-16 | Himax Technologies Limited | Backlight controller, display device using the same and method for controlling backlight module |
| US8103120B2 (en) * | 2008-09-22 | 2012-01-24 | Solomon Systech Limited | Method and apparatus of local contrast enhancement |
| US8451211B2 (en) * | 2010-01-13 | 2013-05-28 | Mediatek Inc. | Dimming control apparatus and method for generating dimming control signal by referring to distribution information/multiple characteristic values derived from pixel values |
| TWI444987B (en) | 2010-07-09 | 2014-07-11 | Realtek Semiconductor Corp | Contrast control device and method thereof |
| CN101923805B (en) * | 2010-07-22 | 2012-11-07 | 友达光电股份有限公司 | Method for adjusting display signal value of flat panel display device and flat panel display device thereof |
| CN102237047B (en) * | 2011-08-09 | 2013-05-29 | 旭曜科技股份有限公司 | Approximation method and device using backlight diffusion in backlight local control system |
| CN103077684B (en) * | 2013-01-23 | 2015-09-16 | 京东方科技集团股份有限公司 | A kind of backlight adjusting method, device and display screen |
| CN104700787B (en) * | 2015-03-30 | 2017-05-24 | 广东欧珀移动通信有限公司 | Method and device for setting backlight value |
| CN109036311B (en) * | 2018-08-16 | 2020-06-05 | 深圳市华星光电半导体显示技术有限公司 | Display driving method, display driving device and device with storage function |
| CN112508896B (en) * | 2020-11-30 | 2023-03-28 | 广东欧谱曼迪科技有限公司 | Blood supply quantitative evaluation and expression method, device, storage medium and terminal |
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