CN101650921B - Method and device of controlling dynamic backlight - Google Patents
Method and device of controlling dynamic backlight Download PDFInfo
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- CN101650921B CN101650921B CN2009100345311A CN200910034531A CN101650921B CN 101650921 B CN101650921 B CN 101650921B CN 2009100345311 A CN2009100345311 A CN 2009100345311A CN 200910034531 A CN200910034531 A CN 200910034531A CN 101650921 B CN101650921 B CN 101650921B
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- 238000000034 method Methods 0.000 title claims abstract description 45
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Abstract
The invention discloses a method of controlling dynamic backlight, particularly a more reasonable method of controlling the brightness of 0D (zero-dimensional) dynamic backlight according to the human vision. The method of controlling dynamic backlight comprises the steps of receiving the input first image signal, receiving the input ambient light detection signal, processing the received input signal, processing the first image signal and the ambient light detection signal and calculating the generated backlight signal. The invention also discloses a device of controlling the dynamic backlight.
Description
Technical field
The present invention relates to a kind of dynamic backlight control method, relate in particular to a kind of dynamic backlight control method based on surround lighting and picture material; The invention still further relates to a kind of dynamic backlight control device.
Background technology
The dynamic backlight technology is a method, and this is a kind of control of intelligence, and these controls make when product is exhibited and sold in the sales field; Can fully show the bright bright-coloured of it; Also can be very comfortable when the consumer watches at home, be not easy to feel tired, simultaneously can also be energy-conservation.Because in dynamic adjustments process backlight, power consumption has just been fallen, the words of often opening backlight.Light source is constant, and its power consumption is very big.
No matter be natural light or dynamic backlight, target all is that the consumer watches more more environmental protection of health of TV.This technology of natural light mainly is to be reduced into the garden polarized light to polarized light, and the garden polarized light is very near natural light.Natural light and dynamic backlight can be described as in the different piece of product and realize, natural light realizes it being that the dynamic backlight dynamic contrast realizes through chip in the rear end near any part of screen of front end.
Liquid crystal display be backrest light as light source luminescent, the common liquid crystals television image is that liquid crystal deflecting element is controlled to picture material just, backlight illumination is not regulated.But dynamic backlight control algolithm before perhaps adopts the ambient light algorithm or adopts the signal algorithm of detected image itself, mainly realizes in order to realize energy-conservation and to be simple and easy to, and does not take into full account the image quality visual effect.
Big such as the picture material mean flow rate, promptly reduce backlight illumination; Mean flow rate is little, promptly improves backlight illumination.This algorithm does not have strict quantitative Analysis and theoretical foundation, the reduction that will inevitably bring image quality and user satisfaction.
Like Chinese patent 200710086857; Name is called in the publication application of " a kind of dynamic backlight control method of LCD ", a kind of dynamic backlight control method of LCD, and described method is to receive a drawing frame data by LCD earlier; Described drawing frame data comprises a plurality of original gray code methods; The original gray code method of drawing frame data is carried out distributed number statistics and numerical operation according to the difference of each GTG value, according to the result of numerical operation, original gray code method is corresponded to a plurality of correction gray code methods again; Then will revise gray code method and be sent to described backlight liquid crystal display control module and data correction unit respectively; And then be able to adjust the brightness of brightness of backlight module and display pannel, and so reduce backlight module power consumption, improve image and present quality.This invention is carried out adjustment backlight based on picture material, influence factor that can not combining environmental light.
Summary of the invention
The purpose of this invention is to provide a kind of dynamic backlight control method,, disclose a kind of more reasonably 0D (zero dimension) dynamic backlight control mode from the human visual angle based on surround lighting and picture material.
Technical scheme of the present invention is, a kind of dynamic backlight control method is used to control the brightness of backlight,
Comprise:
Receive first picture signal of input;
Receive the surround lighting detection signal of input;
First picture signal that processing receives and surround lighting detection signal, and calculate the generation backlight control signal;
Wherein, at first define contrast before first picture signal handled and strengthen, contrast strengthens and is divided into the weak third gear of persistent erection, prime time 15%; Middle-grade 3%; Low grade 0.2%, and the contrast enhancing is set in advance; Definition histogram progression HT, and histogram progression is set in advance; Minimum and maximum brightness according to contrast enhancing and histogram SERIES CALCULATION first picture signal.
As preferred embodiment of the present invention, described surround lighting detection signal produces according to environmental light brightness, the backlight value of said backlight control signal control backlight, and the relation function between said environmental light brightness and the backlight value is:
Wherein, Br
MAXThe maximal value of the backlight value under the expression surround lighting determined value, B
PThe high-high brightness that the expression screen can show, B
AThe expression environmental light brightness.
As preferred embodiment of the present invention, first threshold is set, the surround lighting detection signal is not adjusted backlight value during less than first threshold; When surround lighting detection signal during greater than first threshold, with fixed speed V=(B
P-150cd/m
2The speed adjustment backlight value of)/5.
As preferred embodiment of the present invention, the described first picture signal treatment step comprises the useful signal of choosing first image and chooses the image spreading scope, according to spreading range expansion histogram, regulates backlight according to histogram.
As preferred embodiment of the present invention, the described first picture signal processing procedure comprises: based on the image spreading scope, carry out histogrammic expansion, useful signal is fully supported whole histogram scope; According to histogram calculation backlight control output signal, make the user watch that picture material is constant basically.
As preferred embodiment of the present invention, described expansion histogram comprises linear mode and nonlinear way.
Another object of the present invention is to disclose a kind of dynamic backlight control device, produce backlight control signal according to surround lighting and image input signal.
A kind of dynamic backlight control device is used to adjust the brightness of backlight, comprises that surround lighting detects receiving element, and reception environment light detecting signal, first picture signal receive the unit, receive first picture signal and signal processing unit; Also comprise signal processing unit, said first picture signal and surround lighting detection signal are handled, calculate and produce the backlight control signal and second picture signal;
At first define contrast before said signal processing unit is handled first picture signal and strengthen, the contrast enhancing is divided into the weak third gear of persistent erection, prime time 15%; Middle-grade 3%; Low grade 0.2%, and the contrast enhancing is set in advance; Definition histogram progression HT, and histogram progression is set in advance; Minimum and maximum brightness according to contrast enhancing and histogram SERIES CALCULATION first picture signal.
As preferred embodiment of the present invention; Described signal processing unit comprises that surround lighting is regulated backlight module and picture material is regulated backlight module; Described surround lighting regulates backlight module and picture material adjusting backlight module calculates and produce backlight control signal to described first picture signal and surround lighting detection signal, exports backlight to.
As preferred embodiment of the present invention, described surround lighting detection signal produces according to environmental light brightness, the backlight value of said backlight control signal control backlight, and the relation function between environmental light brightness and the backlight value is:
Wherein, Br
MAXMaximal value backlight under the expression surround lighting determined value, B
PThe high-high brightness that the expression screen can show, B
AThe expression environmental light brightness; First threshold is set, and the surround lighting detection signal is not adjusted backlight value during less than first threshold; When surround lighting detection signal during greater than first threshold, with fixed speed V=(B
P-150cd/m
2The speed adjustment backlight value of)/5.
The present invention is backlight according to the control of surround lighting and picture material, simultaneity factor property play effect energy-conservation and that image quality promotes, be Developing Trend in Technology from now on; From the human visual angle, more reasonably 0D (zero dimension) dynamic backlight control mode, the i.e. relation function of backlight illumination and surround lighting and picture material have been proposed.The present invention takes into account the prioritization scheme of having considered energy-saving effect, measurement index and subjective image quality; Only considering energy-conservation algorithm, or simply regulate algorithm backlight according to mean picture brightness before being superior to also just avoided occurring picture and pursued the extreme of measurement index and so on separately.
Description of drawings
Accompanying drawing 2 is regulated backlight module arthmetic statement synoptic diagram for the surround lighting of preferred embodiment of the present invention;
Accompanying drawing 3 is regulated backlight module algorithm neutral line expansion histogram synoptic diagram for the picture material of preferred embodiment of the present invention;
Accompanying drawing 4 is regulated nonlinear stretch histogram synoptic diagram in the backlight module algorithm for the picture material of preferred embodiment of the present invention.
In the accompanying drawing 1: 1 is signal processing unit, and 2 is that first picture signal receives the unit, and 3 is surround lighting detection signal receiving element, and LABC representes surround lighting adjusting backlight module algorithm, CABC presentation video content adjustment backlight module algorithm.
Embodiment
Below in conjunction with accompanying drawing preferred embodiment of the present invention is set forth in detail, thereby protection scope of the present invention is made more explicit defining so that advantage of the present invention and characteristic can be easier to it will be appreciated by those skilled in the art that.
The dynamic backlight control technology goes on LCD, LCD TV and the Related product; Such as DPF and PDA etc.; The embodiment of the invention is implementation process and the corresponding effects that example is introduced dynamic backlight control with the LCD TV; Thereby help to it will be apparent to those skilled in the art that content of the present invention, but the present invention is not limited to be applied on the LCD TV.
The target of the dynamic backlight control technology that the present invention discloses is:
1. energy-conservation, reduce backlight power, i.e. efficiency ratio;
2. promote visual effect and protecting human body, comprising:
A) contrast strengthens;
B) vision protection is healthy, lessens fatigue.
The dynamic backlight control technology that the present invention discloses; Mainly be that surround lighting and picture signal are optimized reasonable utilization to external world; Through reasonable processing, and then export 2 groups of control signals, comprise output image signal and backlight control signal above-mentioned two kinds of signals; Through the backlight value of backlight control signal control backlight, thus the brightness of adjusting backlight.
As shown in Figure 1, be the dynamic backlight control technology overall procedure synoptic diagram of the embodiment of the invention, 1 is signal processing unit among the figure, and 2 is that first picture signal receives the unit, and 3 is surround lighting detection signal receiving element.Signal processing unit 1 in the embodiment of the invention comprises two modules: surround lighting is regulated backlight module, is called for short LABC below---Light sensor Adaptive Brightness Control; Regulate backlight module with picture material, be called for short CABC below---Content Adaptive Brightness Control.
Surround lighting detection signal receiving element 3 receives the detection signal of external ambient light, and exports this signal to signal processing unit 1; First picture signal receives unit 2 program receiving source signals, and exports this signal to signal processing unit 1; Signal processing unit 1 is according to receiving to such an extent that surround lighting detection signal and first picture signal are optimized processing; Produce backlight control signal through certain calculating; Export backlight control signal to backlight; Realization is to the control of backlight, and exports second picture signal processor of televisor to, supplies the display unit of televisor to show.
Introduce process that signal processing unit handles according to ambient light signal and the process of handling according to picture material below respectively, be called for short LABC processing procedure and CABC processing procedure here respectively.
As shown in Figure 2, in the LABC processing procedure, at first need confirm the maximal value BrMAX backlight of CABC processing procedure, promptly surround lighting is controlled function backlight and has been limited the maximal value that image is controlled function backlight.
Wherein, B
PBe the high-high brightness that screen can show, B
ABe environmental light brightness, environmental light brightness changes according to the variation of actual application environment.
BrMAX minimum value 150cd/m2 is fit to the brightness lower limit that eyes are watched TV, the human eye picture that can normally teleview under this brightness.
BrMAX maximal value BP is the screen maximum brightness of liquid crystal display producer design normally.Under this brightness, can know display image down in bright light environments (outdoor), and brighter concerning indoor environment, be not suitable for the long-time TV reception of family.
Why handle according to above-mentioned processing procedure and function; Be because human eye can be adjusted the scope that pupil keeps incident retina light adaptively to the brightness of image peak value; And when the brightness of image peak value changes significantly, the human eye pupil also significantly convergent-divergent cause visual fatigue.Because brightness of image too conference causes damage to human eye, so the design of liquid crystal display producer can be far below this thresholding; The cone cell of human eye did not play photosensitization when brightness of image was too low, change into by rhabdocyte and play photosensitization, and rhabdocyte only can inductive light intensity and responded to less than color.
Researchs more both domestic and external show that all the ratio of background luminance and TV screen peak brightness is 0.15 is proper.Therefore the function curve of LABC processing procedure is the linear transformation relation between 150*0.15 and BA*0.15, outside then respectively correspondence be minimum value and maximal value.
In the embodiment of the invention, regulate speed backlight through adopting suitable software.During surround lighting control backlight illumination, adopt gradual pattern.Variation according to surround lighting; The surround lighting detecting unit is according to the variation of surround lighting; Produce the surround lighting detection signal, corresponding, the surround lighting detection signal is provided with first threshold (such as being set at 10); When the surround lighting variation makes that the surround lighting detection signal surpasses first threshold (greater than 10), with fixed speed V=(B
P-150) speed/5 (can correspond to register mappings, i.e. PWM dutycycle per second increase and decrease p) changes, like this, surround lighting from the brightest to the darkest, need complete adjustment process in 5 seconds backlight.If in the change procedure backlight, surround lighting changes again, then carries out the renewal of adjustment amount backlight in real time.The purpose of doing like this is to prevent noise and interference, and out-of-date such as walking on the televisor limit as the people, surround lighting also can change, if but changing value does not reach first threshold (less than 10), and then processing unit can not send the signal of adjustment backlight.
Δ BL=V* Δ t, thus adjust to the right place through Δ t.
Like this, the user sees the picture that changes with surround lighting, can not occur simultaneously flashing owing to the veiling glare that has the people to pass by influences picture brightness.
Introduce the CABC processing procedure below, at first must define contrast enhancing σ and be divided into the weak third gear of persistent erection, prime time 15%; Middle-grade 3%; Low-grade 0.2%; Next defines histogram progression HT, such as 8 grades or 32 grades.
Present embodiment is with σ=15%, and HT=8 is that example is carried out example.
The CABC processing procedure is divided into two parts, and one is based on the principle of histogram expansion, and the enhancing signal content is about to useful signal (σ 1～2 σ) and fully supports whole histogram scope; The 2nd, backlight control, the supplementary signal content change makes the user watch that picture material is constant basically.
Wherein, the CABC processing procedure comprises following step: at first choose spreading range, according to this spreading range expansion histogram, regulate backlight according to the histogram result more then.Introduce the implementation process of each step below respectively.
1. choose spreading range:
Be VHDL language below, can change C language or other descriptive language easily into:
Through above L that calculates and H is the minimum brightness and the maximum brightness (after the statistics choice) of image.
2. expansion histogram:
The expansion histogram has dual mode, can be through linear mode, and this mode is fairly simple; Also can adopt nonlinear mode, this mode effect is better, introduces respectively below.
A) linear expansion (simply):
σ1＝max(σ，L-(H-L)/5)
σ2＝min(1-σ，H+H-L)
Brightness=former brightness-(L-σ 1); Contrast=former contrast+(σ 2-σ 1)/(H-L) (dB).
The theoretical foundation of above computation process is, when brightness of image becomes more than 2 times, can produce the situation that gray scale merges, and the level line phenomenon promptly occurs, thus brightness of image upwards expansion can not be above 2 times; Because the image histogram expansion time can reduce backlight illumination, and the brightness of image backlight illumination that also can superpose when expanding downwards reduces, and occur the saturated problem that can't distinguish in dull gray rank easily, so the downward expansion of brightness of image can not be too big, is made as 1.2 here.
Therefore only consider the data sharing that is provided with in luminance contrast and the custom menu, be provided with on the basis the user and increase and decrease ((L-σ 1); + (σ 2-σ 1)/(H-L)), directly do not influence video data.If reducing to lower limit then forces to equal lower limit, no longer continue to reduce; If increasing to the upper limit then forces to equal the upper limit, no longer continue to increase.
B) nonlinear stretch (effect is better):
As shown in Figure 4, the dynamic GAMMA mode of three sections broken lines of employing is that (L～useful signal H) expands to the scope of (σ 1～σ 2) σ 1 and σ 2, and (0～L) extends to (0～σ 1), and (H～1) extends to (σ 2～1) with scope.
3. adjusting backlight:
a)BL＝BLmax/(σ2/H)*Coeff；
Wherein BLmax is the maximal value backlight that LABC confirms.
Coeff is energy-conservation factor, and can get Coeff is 0.9.
Got 1 o'clock, the lifting that is equivalent to picture material brightness is remedied by reduction backlight fully, and dynamic backlight was made as and opened or closed this moment, and the image high-high brightness is all constant.
Because σ is 2＞H, so BL is less than BLmax.
Image is black entirely to show then backlight being reduced to about 1/3 if detect.Realize energy-conservationly significantly, and do not influence the user and watch.
When b) picture material is controlled backlight illumination, adopt fast change pattern, that is, backlight with every frame image content variation, variation promptly backlight was accomplished in 1/50 second (to pal signal).
Accordingly; The present invention has also disclosed a kind of dynamic backlight control device; As shown in Figure 1; Comprise that signal processing unit 1, first picture signal receive unit 2 and surround lighting detection signal receiving element 3, the signal processing unit 1 here comprises two modules: surround lighting is regulated backlight module, is called for short LABC; Regulate backlight module with picture material, be called for short CABC.
More system is more complete for the existing dynamic backlight scheme of the present invention: the content that has contained LABC and CABC with and between relation; Also more careful: as to improve or reduce backlight with respect to some other detected image mean flow rate; Detected image content statistics amount of the present invention more (8～32 parameters); Though adjustment algorithm backlight is complicated, better adaptability, and this complexity is still in system's supportable range; More reasonable: as, can to guarantee the not loss of image quality after dynamic backlight is opened, even also have any to promote through analysis to human-eye visual characteristic.
The above; Be merely embodiment of the present invention; But protection scope of the present invention is not limited thereto; Any those of ordinary skill in the art are in the technical scope that the present invention disclosed, and variation or the replacement that can expect without creative work all should be encompassed within protection scope of the present invention.Therefore, protection scope of the present invention should be as the criterion with the protection domain that claims were limited.
Claims (9)
1. a dynamic backlight control method is used to control the brightness of backlight, comprising:
Receive first picture signal of input;
Receive the surround lighting detection signal of input;
It is characterized in that, handle first picture signal and surround lighting detection signal, and calculate the generation backlight control signal;
Wherein, at first define contrast before first picture signal handled and strengthen, contrast strengthens and is divided into the weak third gear of persistent erection, prime time 15%; Middle-grade 3%; Low grade 0.2%, and the contrast enhancing is set in advance; Definition histogram progression HT, and histogram progression is set in advance; Minimum and maximum brightness according to contrast enhancing and histogram SERIES CALCULATION first picture signal.
2. dynamic backlight control method according to claim 1; It is characterized in that; Described surround lighting detection signal produces according to the brightness of surround lighting, the backlight value of said backlight control signal control backlight, and the relation function between environmental light brightness and the backlight value is:
Wherein, Br
MAXThe maximal value of the backlight value under the expression surround lighting determined value, B
PThe high-high brightness that the expression screen can show, B
AThe expression environmental light brightness.
3. dynamic backlight control method according to claim 2 is characterized in that, first threshold is set, and the surround lighting detection signal is not adjusted backlight value during less than first threshold; When surround lighting detection signal during greater than first threshold, with fixed speed V=(B
P-150cd/m
2The speed adjustment backlight value of)/5.
4. according to claim 1,2 or 3 each described dynamic backlight control methods; It is characterized in that; The described first picture signal treatment step comprises according to first picture signal to be confirmed the useful signal of image and chooses the image spreading scope; According to spreading range expansion histogram, regulate backlight according to histogram.
5. dynamic backlight control method according to claim 4 is characterized in that, the described first picture signal processing procedure comprises: based on the image spreading scope, carry out histogrammic expansion, useful signal is fully supported whole histogram scope; According to the histogram calculation backlight control signal.
6. dynamic backlight control method according to claim 5 is characterized in that, described expansion histogram comprises linear mode and nonlinear way.
7. a dynamic backlight control device is used to adjust the brightness of backlight, comprises that surround lighting detects receiving element, reception environment light detecting signal; First picture signal receives the unit, receives first picture signal of input;
It is characterized in that: also comprise: signal processing unit, said first picture signal and surround lighting detection signal are calculated, produce the backlight control signal and second picture signal;
At first define contrast before said signal processing unit is handled first picture signal and strengthen, the contrast enhancing is divided into the weak third gear of persistent erection, prime time 15%; Middle-grade 3%; Low grade 0.2%, and the contrast enhancing is set in advance; Definition histogram progression HT, and histogram progression is set in advance; Minimum and maximum brightness according to contrast enhancing and histogram SERIES CALCULATION first picture signal.
8. dynamic backlight control device according to claim 7; It is characterized in that; Described signal processing unit comprises that surround lighting is regulated backlight module and picture material is regulated backlight module; Described surround lighting regulates backlight module and picture material adjusting backlight module calculates and produce backlight control signal respectively to described first picture signal and surround lighting detection signal, exports backlight to.
9. dynamic backlight control device according to claim 8; It is characterized in that; Described surround lighting detection signal produces according to the brightness of surround lighting, the backlight value of said backlight control signal control backlight, and the relation function between environmental light brightness and the backlight value is:
Wherein, Br
MAXMaximal value backlight under the expression environment light detecting signal determined value, B
PThe high-high brightness that the expression screen can show, B
AThe expression environmental light brightness; First threshold is set, and the surround lighting detection signal is not adjusted backlight value during less than first threshold; When surround lighting detection signal during greater than first threshold, with fixed speed V=(B
P-150cd/m
2The speed adjustment backlight value of)/5.
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2009
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Address after: 266555 Qingdao economic and Technological Development Zone, Shandong, Hong Kong Road, No. 218 Patentee after: Hisense Visual Technology Co., Ltd. Address before: 266555 Qingdao economic and Technological Development Zone, Shandong, Hong Kong Road, No. 218 Patentee before: QINGDAO HISENSE ELECTRONICS Co.,Ltd. |