CN101364384B - Method and apparatus for liquid crystal image processing - Google Patents
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Abstract
The invention discloses a method for processing a liquid crystal image and a device thereof. The method comprises the following steps: (1) amplifying alternating-current components of video signal components R/G/B in a frame of image according to a correcting function after removing a direct-current component from the each of the components R/G/B respectively; (2) supplementing a direct-current component which is lower than the removed direct-current component based on the amplified alternating-current components respectively, and outputting; and (3) reducing a backlight adjustment coefficientaccording to the correcting function so as to dynamically control the backlight brightness. The technical proposal provided by the invention can improve the depth of field and the three-dimensional effect of the displayed images, increase and expand the contrast of various images, reduce background color, and reduce fatigue due to watching TV; and realizes the dynamic control of the backlight ofa liquid crystal display, so as to save energy consumption.
Description
Technical field
The invention belongs to the display technique field, relate in particular to the technology of liquid crystal image display process.
Background technology
The fast development of display technique makes liquid crystal display device replace CRT (cathode-ray tube (CRT)) display device has become trend of the times, flat panel TV has following advantage: resolution height, not flicker, body are light in a small amount or the like, but the CRT monitor part has autoluminescence, colour gamut is wide, response speed is fast characteristics.
Compare with the CRT monitor part, the LCD TV in the flat panel TV has following defective on showing:
Backlight be a fixing brightness and signal it doesn't matter because the light leak of liquid crystal light valve causes lcd contrast low;
General TV signal load be 30% of a complete white field signal (100% level), if signal press 8BIT calculating, the major part of signal because backlightly can not link with signal, can be wasted 50% backlight luminescence energy nearly under 128 gray shade scales; The energy of these wastes can produce heat energy and bring the raising that shows background color;
Because backlight luminescence is fixed, the flat pannel display area is bigger, so along with signal changes, make the light flux variations that enters eye increase, causes visual fatigue;
If whole image is brighter, particularly contain DC component in the signal, can cause the picture displayed contrast lower, image loses stereovision.
Summary of the invention
The object of the present invention is to provide a kind of method and device of liquid crystal image processing, be intended to solve the problem of adjustment of LCD backlight luminance dynamic and video image dynamic process.
For achieving the above object, the technical solution used in the present invention is as follows:
The method that a kind of liquid crystal image is handled, described method comprises the steps:
A, the AC compounent that will pick out respectively from the vision signal R/G/B component in the two field picture after the DC component are carried out processing and amplifying according to the signal correction function;
B, after replenishing the little DC component of DC component that compares to be picked out on the AC compounent basis after the described amplification, export respectively;
C, reduce adjustment factor backlight on year-on-year basis, dynamically control backlight illumination according to described signal correction function.
Wherein also comprise before the step a:
A0, the vision signal R/G/B component in the two field picture is analyzed, is found out the minimum value of described R/G/B component, with described minimum value as the DC component among the described step a.
Wherein step a specifically comprises:
A1, the histogram that the AC compounent addition of picking out from the R/G/B component of all pixels of a two field picture after the described DC component is formed are added up, and search the critical area of grey level distribution in the described image;
A2, determine the signal correction function of vision signal vision signal to be carried out processing and amplifying according to described critical area.
Describedly reduce adjustment factor backlight on year-on-year basis according to described signal correction function and be specially:
According to the amplification coefficient of described vision signal, reduce adjustment factor backlight in proportion, dynamically control backlight illumination.
Wherein grey level distribution critical area lookup method is as follows:
The threshold value of initialization system, 256 gray shade scales are divided into impartial equal portions, the histogram that the AC compounent addition of picking out from the R/G/B component of all pixels of a two field picture after the described DC component forms is added up, search for to the direction of low gray level statistical regions from the high grade grey level statistical regions, determine that first is higher than the statistical regions Lf1 of threshold value;
Next be that starting point is searched for to low gray level statistical regions with area L f1, if the following distance that contains greater than the point of threshold value continuously of Lf1 is less than preset value, then first statistical regions Lf2 that is higher than the non-conterminous gray scale of threshold value is the critical area of this two field picture, in addition, statistical regions Lf1 is a critical area.
Describedly vision signal carried out processing and amplifying specifically comprise:
If first statistical regions Lf1 that is higher than threshold value is a critical area, then determine signal amplification factor apart from the distance that maximum gray scale deducts described calibrated DC component, amplify critical area signal gray level and deduct described DC component to maximum gray scale with critical area; If critical area is other zone beyond the Lf1, the target gray level of then amplifying the critical area vision signal is Lf1;
Gray level and target gray level with critical area are the intermediate point that benchmark is set up coordinate transform;
According to the coordinate transform intermediate point, one of match is from zero gray level, through intermediate point, ends at monotonically increasing function curve or sectional curve that high grade grey level deducts described DC component;
The amplification coefficient of determining according to the function curve or the sectional curve of match carries out processing and amplifying to corresponding gray-scale signal.
The actual maximal value that the theoretical maximum that the signal amplification factor of described signal correction function is specially described R/G/B signal deducts described DC level and described R/G/B signal deducts the ratio of described DC component.
The present invention also provides a kind of liquid crystal image treating apparatus, described device comprises signal DC level detecting unit, signal processing unit, signal histogram or maximal value analytic unit, signal averaging analytic unit and adjustment control signal generating unit backlight, wherein:
Described signal DC level detecting unit is used for the R/G/B signal of a two field picture of input is detected, and determines the DC level of this two field picture, and described DC level is transferred to described signal processing unit;
Described signal histogram or maximal value analytic unit connect described signal processing unit and adjustment control signal generating unit backlight respectively, be used for picking out described DC level value afterwards and carry out histogram analysis or maximal value analysis according to the R/G/B component of this two field picture, determine signal correction function and adjustment coefficient backlight, then described signal correction function is transferred to described signal processing unit, adjustment coefficient backlight is transferred to described adjustment control signal generating unit backlight;
Described signal processing unit is used for the DC level of received signal DC level detecting unit transmission, receive the signal correction function of described signal histogram or maximal value analytic unit transmission, and respectively the value that the R/G/B component of input deducts after the described DC level is amplified, and then on the value of amplifying, add a DC level littler than described DC level according to described signal correction function;
Described signal averaging analytic unit is used for receiving the R/G/B signal, and calculate the mean flow rate ABL of this two field picture, and definite according to described mean flow rate to initial adjustment coefficient backlight, will output to described adjustment control signal generating unit backlight to initial adjustment coefficient backlight;
Adjustment control signal generating unit backlight is finally determined the pwm signal dutycycle according to the initial adjustment coefficient of signal averaging analytic unit transmission and the adjustment coefficient backlight of signal histogram or the transmission of maximal value analytic unit, it is backlight to output to LCD, realizes the dynamic control of backlight illumination.
Described DC level is the minimum value in the described R/G/B component.
Described signal maximum analytic unit is used for the ratio that actual maximal value that theoretical maximum according to described R/G/B signal deducts described DC level and described R/G/B signal deducts described DC component and determines described signal correction function and adjustment coefficient backlight.
The present invention overcomes the deficiencies in the prior art, adopt the DC component of picking out at first respectively in the two field picture R/G/B signal, AC compounent is carried out linearity or non-linear amplification, on the basis of the AC compounent of amplifying, replenish the little DC component of DC component that ratio is original then, control the technical scheme of backlight illumination simultaneously according to the coefficient that AC compounent is amplified, can improve the image depth and the stereoscopic sensation of demonstration, improve the contrast of the various pictures of expansion, reduce background color, reduce the fatigue strength of watching TV; In addition, technical scheme provided by the invention has also realized the dynamic control to backlight liquid crystal display, has saved energy resource consumption.
Description of drawings
Fig. 1 is an embodiment of the invention process flow diagram;
Fig. 2 is the synoptic diagram of the described every frame video signal of the embodiment of the invention;
The histogram of Fig. 3 the present invention one two field picture grey level distribution;
The described video correction curve map of Fig. 4 embodiment of the invention;
Fig. 5 is the vision signal synoptic diagram of the described output of the embodiment of the invention;
Fig. 6 is the synoptic diagram that the described employing lateral magnifying power of the embodiment of the invention amplifies vision signal;
Fig. 7 is the theory diagram of the described device of the embodiment of the invention.
Embodiment
Technical scheme provided by the invention is: pick out the DC component in the two field picture R/G/B signal at first respectively, the R/G/B signal of having picked out DC component is carried out linearity or non-linear amplification respectively, after the little DC component of the original DC component of an additional ratio on the basis of the AC compounent of amplifying, export then, control backlight illumination according to the coefficient that AC compounent is amplified simultaneously.
In order to make purpose of the present invention, technical scheme and advantage clearer,, the present invention is further elaborated below in conjunction with drawings and Examples.Should be appreciated that specific embodiment described herein only in order to explanation the present invention, and be not used in qualification the present invention.
General pattern all contains DC component, shows on the image, is exactly that picture contrast is low, and image is bright but do not have stereovision; But eye mainly is a contrast to the sensation of brightness, and the absolute value of brightness is not felt; For example, see TV under the surround lighting of nit at nights 30, it is 1～200cd/m2 (every square metre of candela, i.e. nit) that human eye can divide other screen intensity scope, at this moment the brightness of 100 nits just causes quite bright sensation, and the brightness that only is lower than 1 nit just causes the black sensation; If by day, bright sensation can change along with the variation of surround lighting, and bright feeling needs 200cd/m
2More than.
Based on above consideration, the workflow of the embodiment of the invention specifically comprises the steps: as shown in Figure 1
1, the video R/G/B signal in the two field picture is analyzed, found out the minimum value of all R/G/B signals in this two field picture, the DC level of this minimum value as the R/G/B signal;
As shown in Figure 2, be example with second frame (2frame), in this frame, the signal DC level is Sd, and the actual maximal value of R/G/B signal is Ssmax, and theoretical maximum is Smax, and if R/G/B respectively is 8bit, then Smax is 255;
2, before the R/G/B signal is handled, at first pick out DC component wherein, AC compounent is wherein carried out processing and amplifying, on the basis of the AC compounent of amplifying, replenish the little DC component of DC component that ratio is original then;
Specifically, the R passage is handled (this sentences the R component is that example describes, to the processing of G component and B component with the R component) according to following formula:
R_out=f (R_in-Sd)+Sdx, wherein:
R_in is the R component of input, and R_in-Sd has picked out DC component minimum in this frame signal signal afterwards, and f () is the signal correction function, Sdx=Sd * K
DC, K
DCBe the correction factor of DC level, this coefficient is an empirical value, and (so Sdx＜Sd), general Sd is big more, and KDC can select more little between being generally 0～1; R_out is respectively output signal.
The correction factor K1 of wherein, signal correction function f () and DC level determines referring to following explanation:
In the present embodiment, the gray shade scale that each component of R/G/B is picked out after the DC component is carried out statistics with histogram, (255-Sd) individual gray-scale data is divided into (255-Sd)/8 equal portions (also can be divided into other equal portions in the practical application, as 16,64 equal portions), the grey level distribution data of statistical picture, draw the histogram of this two field picture grey level distribution, as shown in Figure 3, horizontal ordinate is the distribution of gray level among Fig. 3, (each grade is represented 8 gray levels to (255-Sd)/8 grade altogether, (255-Sd) individual gray level altogether), ordinate is represented in this two field picture the cumulative number (numerical value is normalized value) to pixel that should gray shade scale, by adding up the gray level of each pixel, set up the histogram of grey level distribution, can know the distribution of showing this two field picture gray shade scale pixel.
The ensuing important task of system is to search the critical area of image distribution in this two field picture, also is the intensity profile main region the most of this two field picture.Consult Fig. 3, system at first sets a threshold value, this threshold value is determined when system design, is sequential search by high grade grey level to low gray level, determine that first is higher than the high grade grey level corresponding gray scale point Lf1 of threshold value correspondence in histogram, threshold setting is 15 in native system, and first high grade grey level corresponding gray scale point Lf1 that is higher than the threshold value correspondence should be the gray shade scale of horizontal ordinate 19 correspondences, detailed as shown in Figure 3.
Be starting point then, on the lower direction of gray level, continue to seek, determine in the histogram that greater than threshold value, gray level has following several situation less than second Lf2 of first Lf1, is respectively described below with Lf1:
If second and first are adjacent, continuation is to the lower direction finding of gray scale, if in above-mentioned process of looking for Lf2, continuous point is arranged between Lf1 and the Lf2, and the distance between Lf1 and the Lf2 is greater than preset value, that is to say, near zone below the Lf1 point will have abundant pixel, this regional pixel will be a main component part in this two field picture, be that reference point is handled this frame pixel then, determine a signal correction function f () according to the distance of Lf1 distance distribution histogram horizontal ordinate (255-Sd)/8 with the Lf1 point.
If in the process of above-mentioned searching Lf2, the distance that contains greater than the point of threshold value continuously between Lf1 and the Lf2 is less than preset value, and then getting first non-conterminous gray scale point that is higher than threshold value is second Lf2, is that reference point is handled this frame pixel with the Lf2 point then.
If do not find the non-conterminous gray scale point that is higher than threshold value being lower than on the direction that Lf1 orders, also just say for this two field picture, the gray level of exhausted most pixel concentrates on the Lf1 point or its following immediate area, for this two field picture, is that reference point is handled this frame pixel with the Lf1 point then.
In the present embodiment, if the preset value of the distance between first Lf1 and second Lf2 is 5, consult Fig. 3, the point greater than threshold value continuous between Lf1 and the Lf2 is 16 to 19, and its distance is 4 not greater than preset value 5, therefore, second Lf2 gets the non-conterminous gray scale point that first is higher than threshold value, as the gray scale point of 7 correspondences of horizontal ordinate among Fig. 3, determine that the gray level of horizontal ordinate below 7 will be the main region that this frame signal need be amplified, just the critical area of image distribution.
The purpose that image is handled is the critical area that will highlight grey level distribution, therefore, processing to critical area, be exactly to guarantee under the distortionless situation of image, the critical area of grey level distribution is amplified to greatest extent, the principle of general definite amplification coefficient is, amplification coefficient becomes non-linear direct ratio with the point that will amplify with the distance of (255-Sd)/8, the high more pixel of gray level just, the coefficient of its amplification is more little, the pixel that gray level is low more, and the coefficient of its amplification is big more, amplification coefficient can adopt the mode of tabling look-up to realize, the corresponding relation with gray level and amplification coefficient is stored in the system in advance.
In the present embodiment, two points have finally been determined, first Lf1 and second Lf2, the pixel grey level stretching that Lf2 point in the video image is corresponding is to the corresponding gray scale of Lf1 point, make the Lf2 point transformation to the Lf1 point, also just determine the coordinate transforming point M (7 of an intermediate point of signal amplified curve correspondence, 19), add initial point O (0,0), but gets a signal correction function f () by O, M, 3 matches of N with terminal point N ((255-Sd)/8, (255-Sdx)/8), resulting curve is the signal correction curve of this frame image signal, shown in Fig. 4 curve a; Another more rough match can be the compensated curve of this frame image signal by the direct broken line c that connects O, M, 3 gained of N, this measure can realize providing a higher signal amplification coefficient to the following pixel of Lf2, and provide a relatively low signal amplification factor to the pixel more than the Lf2, realization is amplified the segmentation of vision signal, to realize highlighting the critical area of image distribution.The vision signal of different frame has different amplified curves usually, curve b among Fig. 4 is the amplified curve of another two field picture, this curve mainly is amplified to grade 28 with grade 13, curve L among Fig. 4 then is (255-Sdx)/(255-Sd) times curve of video data, the initial reference line of vision signal amplification just.
According to above-mentioned compensated curve signal R_in-Sd is amplified signal and additional DC component Sdx after, the signal schematic representation of output is as shown in Figure 5.
Present embodiment is in the Video signal processing process, the vision signal that gray level is lower is amplified, in order to guarantee the undistorted of video image, thereby one of needs establishment can be to COEFFICIENT K 1 of carrying out regulating and controlling backlight, and according to the amplification situation of each frame video signal, real-time regulates backlight, to reduce brightness backlight.Therefore, inversely proportional relation between the amplification coefficient of adjustment factor K1 backlight and signal, (Lf2, the inverse of amplification coefficient Lf1) can obtain the point that can select the signal amplified curve of choosing of adjustment factor K1 backlight.Owing to Video signal processing is primarily aimed at the critical area of image distribution in the two field picture, for the amplification of more real reflecting video picture signal and the complementary relationship between the adjusting backlight, from the inverse of the signal amplification factor of preferably getting main region adjustment factor K1 backlight as this frame signal, in the present embodiment, the more excellent selection of adjustment factor K1 backlight is the Lf2/Lf1 reciprocal of the Lf2 amplification coefficient of ordering, and promptly gets K1=Lf2/Lf1.
3, backlight according to adjustment coefficient adjustment backlight;
After having determined adjustment factor backlight, by calculating the mean flow rate ABL of this two field picture, according to the eye characteristic, in conjunction with test CRT colour TV, draw the function of one group of empirical value or match, table look-up or realize initial adjustment backlight by function, backlight to after the initial adjustment then again in conjunction with adjustment factor K1 backlight, final determine the pwm signal dutycycle, it is backlight to output to LCD, realizes the dynamic control of backlight illumination.
Except determine the critical area of a two field picture according to above-mentioned histogram, definite then signal correction function f () is carried out outside the nonlinear amplification, can also adopt lateral magnifying power that the R signal of having picked out DC component is amplified, f's this moment () is definite as follows:
According to the Ssmax of signal, determine that signal is amplified to the amplification coefficient Ke=(Smax-Sdx)/(Ssmax-Sd) of full amplitude, shows as Fig. 6.
Theory diagram such as Fig. 7 of the device that the embodiment of the invention provides show, comprise signal DC level detecting unit, signal processing unit, signal histogram or maximal value analytic unit, signal averaging analytic unit and adjustment control signal generating unit backlight.
Wherein, signal DC level detecting unit is used for the R/G/B signal of a two field picture of input is detected, find out the minimum value in all R/G/B signals in this two field picture,, and this DC level value Sd is transferred to signal processing unit its DC level Sd as this two field picture;
Signal histogram or maximal value analytic unit connect signal processing unit and adjustment control signal generating unit backlight respectively, be used for picking out Rd value afterwards and carry out the analysis of histogram analysis maximal value according to the R/G/B component of this two field picture, determine signal correction function f () and adjustment COEFFICIENT K 1 backlight, then signal correction function f () is transferred to signal processing unit, adjustment COEFFICIENT K 1 backlight is transferred to adjustment control signal generating unit backlight, and detailed process as mentioned above;
The DC level value Sd of signal processing unit received signal DC level detecting unit transmission, the signal correction function f () of received signal histogram or the transmission of maximal value analytic unit afterwards, according to R_out=f (R_in-Sd)+Sdx the R signal is handled, according to G_out=f (G_in-Sd)+Sdx the G signal is handled, according to B_out=f (B_in-Sd)+Sdx the B signal is handled, institute just, at first respectively the value that the R/G/B component of input deducts Sd is amplified according to f (), and then on the value of amplifying, add Sdx (Sdx=Sd *
KDC), DC level correction factor K wherein
DCValue be empirical value, span is between the 0-1;
The signal averaging analytic unit is used for receiving the R/G/B signal, and calculate the mean flow rate ABL of this two field picture, according to the eye characteristic, in conjunction with test CRT colour TV, draw the function of one group of empirical value or match, table look-up or realize to be input to initial adjustment coefficient backlight to adjustment control signal generating unit backlight initial adjustment backlight by function;
Adjustment control signal generating unit backlight is according to the initial adjustment coefficient of signal averaging analytic unit transmission and adjustment COEFFICIENT K backlight 1 final definite pwm signal dutycycle of signal histogram or the transmission of maximal value analytic unit, it is backlight to output to LCD, realizes the dynamic control of backlight illumination.
The above only is preferred embodiment of the present invention, not in order to restriction the present invention, all any modifications of being done within the spirit and principles in the present invention, is equal to and replaces and improvement etc., all should be included within protection scope of the present invention.
Claims (10)
1. the method that liquid crystal image is handled is characterized in that described method comprises the steps:
A, the AC compounent that will pick out respectively from the vision signal R/G/B component in the two field picture after the DC component are carried out processing and amplifying according to the signal correction function;
B, after replenishing the little DC component of DC component that compares to be picked out on the AC compounent basis after the described amplification, export respectively;
C, reduce adjustment factor backlight on year-on-year basis, dynamically control backlight illumination according to described signal correction function.
2. method according to claim 1 is characterized in that, wherein also comprises before the step a:
A0, the vision signal R/G/B component in the two field picture is analyzed, is found out the minimum value of described R/G/B component, with described minimum value as the DC component among the described step a.
3. method according to claim 1 is characterized in that, wherein step a specifically comprises:
A1, the histogram that the AC compounent addition of picking out from the R/G/B component of all pixels of a two field picture after the described DC component is formed are added up, and search the critical area of grey level distribution in the described image;
A2, determine the signal correction function of vision signal vision signal to be carried out processing and amplifying according to described critical area.
4. method according to claim 3 is characterized in that, describedly reduces adjustment factor backlight on year-on-year basis according to described signal correction function and is specially:
According to the amplification coefficient of described vision signal, reduce adjustment factor backlight in proportion, dynamically control backlight illumination.
5. method according to claim 3 is characterized in that, wherein grey level distribution critical area lookup method is as follows:
The threshold value of initialization system, its gray shade scale is divided into impartial equal portions, the histogram that the AC compounent addition of picking out from the R/G/B component of all pixels of a two field picture after the described DC component forms is added up, search for to the direction of low gray level statistical regions from the high grade grey level statistical regions, determine that first is higher than the statistical regions Lf1 of threshold value;
Next be that starting point is searched for to low gray level statistical regions with area L f1, if the following distance that contains greater than the point of threshold value continuously of Lf1 is less than preset value, then first statistical regions Lf2 that is higher than the non-conterminous gray scale of threshold value is the critical area of this two field picture, in addition, statistical regions Lf1 is a critical area.
6. method according to claim 3 is characterized in that, describedly vision signal is carried out processing and amplifying specifically comprises:
If first statistical regions Lf1 that is higher than threshold value is a critical area, then the distance that deducts between the described calibrated DC component with critical area and maximum gray scale is determined signal amplification factor, amplifies critical area signal gray level and deducts described DC component to maximum gray scale; If critical area is other zone beyond the Lf1, the target gray level of then amplifying the critical area vision signal is Lf1;
Gray level and target gray level with critical area are the intermediate point that benchmark is set up coordinate transform;
According to the coordinate transform intermediate point, one of match is from zero gray level, through intermediate point, ends at monotonically increasing function curve or sectional curve that high grade grey level deducts described DC component;
The amplification coefficient of determining according to the function curve or the sectional curve of match carries out processing and amplifying to corresponding gray-scale signal.
7. method according to claim 1, it is characterized in that the actual maximal value that the theoretical maximum that the signal amplification factor of described signal correction function is specially described R/G/B signal deducts described DC level and described R/G/B signal deducts the ratio of described DC component.
8. liquid crystal image treating apparatus, it is characterized in that, described device comprises signal DC level detecting unit, signal processing unit, signal histogram or maximal value analytic unit, signal averaging analytic unit and adjustment control signal generating unit backlight, wherein:
Described signal DC level detecting unit is used for the R/G/B signal of a two field picture of input is detected, and determines the DC level of this two field picture, and described DC level is transferred to described signal processing unit;
Described signal histogram or maximal value analytic unit connect described signal processing unit and adjustment control signal generating unit backlight respectively, be used for picking out described DC level value afterwards and carry out histogram analysis or maximal value analysis according to the R/G/B component of this two field picture, determine signal correction function and adjustment coefficient backlight, then described signal correction function is transferred to described signal processing unit, adjustment coefficient backlight is transferred to described adjustment control signal generating unit backlight;
Described signal processing unit is used for the DC level of received signal DC level detecting unit transmission, receive the signal correction function of described signal histogram or maximal value analytic unit transmission, and respectively the value that the R/G/B component of input deducts after the described DC level is amplified, and then on the value of amplifying, add a DC level littler than described DC level according to described signal correction function;
Described signal averaging analytic unit is used for receiving the R/G/B signal, and calculate the mean flow rate ABL of this two field picture, and definite according to described mean flow rate to initial adjustment coefficient backlight, will output to described adjustment control signal generating unit backlight to initial adjustment coefficient backlight;
Adjustment control signal generating unit backlight is finally determined the pwm signal dutycycle according to the initial adjustment coefficient of signal averaging analytic unit transmission and the adjustment coefficient backlight of signal histogram or the transmission of maximal value analytic unit, it is backlight to output to LCD, realizes the dynamic control of backlight illumination.
9. device according to claim 8 is characterized in that, described DC level is the minimum value in the described R/G/B component.
10. device according to claim 8, it is characterized in that described signal maximum analytic unit is used for the ratio that actual maximal value that theoretical maximum according to described R/G/B signal deducts described DC level and described R/G/B signal deducts described DC component and determines described signal correction function and adjustment coefficient backlight.
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|---|---|---|---|---|
| US8711083B2 (en) * | 2009-05-20 | 2014-04-29 | Marvell World Trade Ltd. | Liquid crystal display backlight control |
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