CN100583214C - LCD television set backlight control system and method - Google Patents
LCD television set backlight control system and method Download PDFInfo
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- CN100583214C CN100583214C CN200610063617A CN200610063617A CN100583214C CN 100583214 C CN100583214 C CN 100583214C CN 200610063617 A CN200610063617 A CN 200610063617A CN 200610063617 A CN200610063617 A CN 200610063617A CN 100583214 C CN100583214 C CN 100583214C
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
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- Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
- Y02B20/00—Energy efficient lighting technologies, e.g. halogen lamps or gas discharge lamps
- Y02B20/40—Control techniques providing energy savings, e.g. smart controller or presence detection
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Abstract
The invention discloses a liquid crystal television backlight control system and a method thereof, in which the backlight control system mainly comprises a video signal analyzing unit, a region data correcting unit, a region backlight signal control unit and an average illumination adjusting unit. The backlight control method comprises the following steps: performing statistics and analysis for the video signal by regions; correcting the video signal in individual backlight regions according to the analyzed result; and generating the backlight control signal for controlling the light emitting source at each region independently according to the analyzed result and performing dynamical illumination control for each light emitting source independently. The liquid crystal television backlight control method of the invention controls independently the illumination of each light emitting source according to the grayscale level distribution conditions of video signal at individual backlight regions, thus performing dynamical control on the backlight illumination by regions, saving power consumption, enhancing contrast, and improving observational comfort.
Description
[technical field]
The image that the present invention relates to LCD TV shows the field, relates in particular to LCD television set backlight control system and method.
[background technology]
At present, the LCD TV performance is improved fast, is progressively entering our life.But some intrinsic shortcoming but shows especially out.
See also Fig. 1, existing C CFL back light unit comprises circuit board, a plurality of CCFL fluorescent tube and backlight, and these a plurality of CCFL fluorescent tubes are luminous jointly under the driving of the same signal of circuit board.In the course of work of LCD TV, simultaneously luminous with constant brightness always.
Because overall fixed backlight is luminous, for darker image, black part can not be very black, and the part brightness of white is not high; Because the brightness of each backlight lamp tube can not be with the brightness independent variation of place image content, no matter how the picture content displayed changes, and the power consumption of complete machine remains unchanged always.In addition, when the picture mean flow rate was brighter, the luminous flux of whole image was bigger, can cause visual fatigue.
Therefore, provide a kind of brightness of each backlight lamp tube important meaning will be arranged with the back light system of place image content independent variation.
[summary of the invention]
Technical matters to be solved by this invention is, a kind of LCD television set backlight control system and method are provided, and it is luminous to solve existing LCD TV backlight overall fixed, can't change and the defective of subregional dynamic control backlight illumination with picture.
The technical solution adopted in the present invention is: a kind of LCD TV backlight control method is provided, said method comprising the steps of: maximal value or main value gray areas to the video gray scale of each backlight area are added up and are analyzed; According to analysis result the vision signal of each backlight area is corrected; And, respectively each light emitting source is independently carried out luminance dynamic control according to the independent backlight control signal of controlling each regional light emitting source of analysis result generation.
LCD TV backlight control method of the present invention is further improved and is, described method comprises that also the mean flow rate ABL to each frame video letter calculates, and carries out integrally-regulated according to result of calculation to the brightness of all backlights.
Described method comprises that also the mean flow rate ABL to each frame video signal calculates, and determines integrally-regulated coefficient is carried out in the brightness of all backlights according to result of calculation.
Further, described main value gray areas is for comprising the more or more relatively gray scale equal portions corresponding gray scale zone of pixel quantity in backlight area.
Further, definite method of described main value gray areas is:
The video gray scale is divided into several gray scale equal portions;
Add up the pixel quantity of each the gray scale equal portions in each backlight area respectively;
As ordinate, horizontal ordinate is several gray scale equal portions, sets up the histogram of grey level distribution with the cumulative number of each gray scale equal portions corresponding gray scale level of described backlight area;
Set a big threshold value and a little threshold value, compare to low gray scale equal portions from high gray scale equal portions then, if the quantity of in one's duty pixels such as certain gray scale is greater than big threshold value, then the gray areas of this gray scale equal portions correspondence is the main value gray areas, if there is not the quantity of pixel to find greater than big threshold value gray scale equal portions, then searching pixel quantity has a plurality of gray scale equal portions greater than little threshold value continuously, determines main value gray areas backlight in this way.
The present invention also provides a kind of LCD television set backlight control system, comprise converter circuit and a plurality of light emitting source, it is characterized in that, described system also comprises the video signal analysis unit, be used for the receiving video signals input, screen area view data to each light emitting source correspondence is added up, and comprises the high grade grey level of the vision signal of directly searching in each light emitting source corresponding region or the main value gray areas in the corresponding region; The area data correcting unit, described area data correcting unit is connected with described video signal analysis unit, and receiving video signals and analysis result are proofreaied and correct this vision signal according to analysis result, are transferred to display unit again and show; Zone backlight signal control module generates regional backlight control signal according to the analysis result of described video signal analysis unit and is transferred to described converter circuit; Described converter circuit produces the circuit signal of controlling each light emitting source separately and gives light emitting source.
More specifically, described regional backlight signal control module is according to the high grade grey level or the main value gray areas of the vision signal in each light emitting source corresponding region, the light emitting source brightness of control corresponding region.
Further improve being LCD television set backlight control system of the present invention is also comprised the mean flow rate regulon, be connected with regional backlight signal control module.
Further, described main value gray areas is for comprising the more or more relatively gray scale equal portions corresponding gray scale zone of pixel quantity in backlight area.
Further, described main value gray areas is determined in the following manner:
The video gray scale is divided into several gray scale equal portions;
Add up the pixel quantity of each the gray scale equal portions in each backlight area respectively;
As ordinate, horizontal ordinate is several gray scale equal portions, sets up the histogram of grey level distribution with the cumulative number of each gray scale equal portions corresponding gray scale level of described backlight area;
Set a big threshold value and a little threshold value, compare to low gray scale equal portions from high gray scale equal portions then, if the quantity of in one's duty pixels such as certain gray scale is greater than big threshold value, then the gray areas of this gray scale equal portions correspondence is the main value gray areas, if there is not the quantity of pixel to find greater than big threshold value gray scale equal portions, then searching pixel quantity has a plurality of gray scale equal portions greater than little threshold value continuously, determines main value gray areas backlight in this way.
The present invention compared with prior art, beneficial effect is: LCD TV backlight control method of the present invention is analyzed the video input signals that receives by the video signal analysis unit, and according to the video in each district backlight letter grey level distribution situation, produce the circuit signal of each regional light emitting source of control separately, each light emitting source is independently carried out brilliance control, thereby the subregion is controlled dynamically backlight illumination, reach the saving power consumption, improve contrast, improve the luminous flux of picture simultaneously, improve and watch comfort level.
[description of drawings]
Fig. 1 is existing LCD television set backlight control system synoptic diagram.
Fig. 2 is the principle function block diagram of LCD television set backlight control system provided by the invention.
Fig. 3 is the histogram of the two field picture grey level distribution in the backlight area of the present invention.
Fig. 4 (a) is the backlight illumination synoptic diagram of available liquid crystal back light system.
Fig. 4 (b) is the backlight illumination curve synoptic diagram of the present invention perpendicular to each point on the fluorescent tube direction.
Fig. 4 (c) adjusts curve according to backlight illumination curve shown in Fig. 4 (b) to the secondary of signal.
Fig. 5 is the principle function block diagram of an improved LCD television set backlight control system provided by the invention.
[embodiment]
The principle of LCD television set backlight control system provided by the invention is to realize independent control is carried out in each light emitting source brightness of backlight according to the luminance difference of each regional vision signal, make the black part of the same painting face more black, bright part is brighter, when improving contrast, save energy consumption, the backlight that changes the available liquid crystal TV can not change with the variation of image content, picture whatsoever, the power of complete machine remains unchanged always, and each light emitting source of backlight is simultaneously luminous in a fixed manner.
Realize the subregion control backlight to vision signal, need add up and analyze the vision signal subregion, see also Fig. 2, the principle function block diagram of LCD television set backlight control system provided by the invention comprises video signal analysis unit 12, area data correcting unit 14, regional backlight signal control module 16, Invertor (converter) circuit 18 and CCFL fluorescent tube (cold-cathode fluorescence lamp).Video signal analysis unit 12 is from the input of video frequency processing chip receiving video signals, the vision signal that receives is analyzed, video data after will analyzing then is transferred to area data correcting unit 14 and regional backlight signal control module 16 respectively, area data correcting unit 14 carries out importing display unit (figure does not show) after the correction process to the vision signal that receives according to the analysis result of video signal analysis unit 12, zone backlight signal control module 16 analysis results according to video signal analysis unit 12 generate regional backlight control pwm signal, produce the circuit signal of each light emitting source of control separately by Invertor circuit 18, be transferred to backlight as CCFL fluorescent tube etc.Like this by to vision signal subregion analyzing and processing, according to the situation of the vision signal of each backlight area, the independent control by backlight to CCFL effectively reduces Overall Power Consumption again.The situation of the vision signal in territory, the independent control by backlight to CCFL effectively reduces Overall Power Consumption.
For LCD television set backlight control system of the present invention is further understood, data processing and the control principle to each functional unit among the present invention is elaborated below.
The 12 receiving video signals input of video signal analysis unit, by the FPGA algorithm, screen area view data to each CCFL fluorescent tube correspondence is added up, according to the back light system designing requirement, the statistical content of vedio data comprises the maximal value of the video gray scale in each light emitting source corresponding region, promptly directly search the high grade grey level of vision signal in each light emitting source corresponding region, and should be worth input area data correcting unit 14 and regional backlight signal control module 16 respectively.
Area data correcting unit 14 and regional backlight signal control module 16 are controlled video data and backlight signal jointly according to the video data analysis result of video signal analysis unit 12 transmission.For adopting maximum value process, zone light emitting source brightness backlight depends primarily on the gray level of the high grade grey level of each backlight area, if the gray level of the high grade grey level in certain zone is lower, show that then the vision signal in the zone is relatively darker or black, then can turn off the control signal of this regional backlight or reduce the control signal dutycycle of this regional backlight, avoid regional backlight fearless luminous, to save energy consumption; If the gray level of the high grade grey level in certain zone mediates the stage, then area data correcting unit 14 can be with the suitable amplification of vision signal that should the zone, and regional backlight signal control module 16 reduces this regional backlight illumination with corresponding ratio simultaneously; If the gray level of high grade grey level is higher, then vision signal is not processed, simultaneously backlightly also do not adjust, normally luminous.
In view of maximum value process picks up the highest pixel of video signal gray level in each backlight area, and region memory the higher pixel of individual signal gray level, the integral status of the grey level distribution of signal in the reflecting regional really, particularly assorted fast or regional in signal only exist the situation of indivedual or a small amount of bright spot also usually to occur.Therefore, adopt the foundation of gray level maximum value process, to a certain extent to reducing the DeGrain of energy consumption backlight as regional backlight signal.
For the vision signal to each backlight area is more targetedly effectively handled, to zone control more targetedly backlight, thereby the intensity profile of each backlight area vision signal of the more accurate understanding of needs, the distributed number situation of the gray scales at different levels by adding up this backlight area inner video image, find out the critical area of grey level distribution, be also referred to as the main value gray areas.In general, in a two field picture, more zone or the more relatively zone of pixel grayscale distribution is exactly key zone, after having determined the main value gray areas, system determines the correction system or the correction curve of the video image of this backlight area then according to the position of this main value gray areas, the gray level height of common main value gray areas, vision signal and backlightly do not process substantially, the gray level of main value gray areas is low more, then the amplitude that signal is corrected is big more, reduces low more that brightness backlight also falls simultaneously, by to signal and reverse process backlight, in the display brightness that does not reduce signal, realize the reduction of energy consumption backlight.
The intensity profile statistics of each backlight area vision signal can also adopt histogrammic mode to add up, consult the histogram of the two field picture grey level distribution in backlight area of the present invention shown in Figure 3, altogether 256 grades video gray scale is divided into 32 gray scale equal portions and (also can be divided into other equal portions in the practical application, as 16,64 equal portions), each equal portions is contained 8 gray levels, add up the pixel quantity of each the gray scale equal portions in each backlight area then respectively, with the cumulative number (numerical value is normalized value) of each gray scale equal portions corresponding gray scale level of described backlight area as ordinate, horizontal ordinate is 32 gray scale equal portions, set up the histogram of grey level distribution, determine the main value gray areas of the vision signal in this backlight area by the mode of initialization system threshold value.Being summarized as follows of threshold setting, big threshold value of default and a little threshold value, system compares to low gray scale equal portions from high gray scale equal portions then, if the quantity of in one's duty pixels such as certain gray scale is greater than big threshold value, then the gray areas of this gray scale equal portions correspondence is the main value gray areas, if there is not the quantity of pixel to find greater than big threshold value gray scale equal portions, then searching pixel quantity has a plurality of gray scale equal portions greater than little threshold value continuously, determines main value gray areas backlight in this way.In the backlight area as Fig. 2, the quantity of gray-level pixels that 4 continuous equal portions are arranged between the 16th to 19 equal portions is greater than 20, therefore, the corresponding gray scale level is the main value gray areas of this backlight area between the 16th to 19 equal portions, determine the compensation coefficient or the correction curve of the video image of this backlight area again according to the position of main value gray areas, regional vision signal is selectively amplified.Determine that general the principle of amplification coefficient is, amplification coefficient with the point that will amplify with 31 apart from becoming non-linear direct ratio, the high more pixel of gray level just, the coefficient of its amplification is more little, the pixel that gray level is low more, the coefficient of its amplification is big more, and amplification coefficient can adopt the mode of tabling look-up to realize, stores the mapping table of gray level and amplification coefficient in the system.
According to aforementioned, in to the process of carrying out controlling the subregion backlight, difference because of the vision signal of each backlight area, cause the luminosity of each light emitting source is adjusted, feasible brightness originally is evenly backlight to become no longer even, the variation of generation from Fig. 4 (a) to Fig. 4 (b), and the uneven display effect that must influence whole screen backlight of luminosity, therefore, in the process of zone adjustment backlight, except will examining each regional vision signal of filter and one's respective area light-source brightness variation relation, also to comprehensively examine the influence of the variation of other regional light-source brightness of filter to the one's respective area, the calculating of this influence is a quite complexity, but for the back light system of CCFL fluorescent tube that light emitting source is strip, being parallel to last each the pixel brightness of the direction of fluorescent tube (laterally) is identical, therefore, only need examine the brightness variation of filter perpendicular to each point on the direction of CCFL fluorescent tube.Because CCFL luminous is similar Gaussian distribution, also can measure the luminosity of each fluorescent tube of acquisition and the curved line relation f (x) of distance by experiment, because the luminosity of each pixel of image is the coefficient results of all light emitting sources, can pass through following formulate at the brightness L perpendicular to each pixel on the fluorescent tube direction (vertically)
, l wherein
iIt is the luminosity of i fluorescent tube, can set up luminosity curve by following formula perpendicular to each point on the fluorescent tube direction, shown in Fig. 4 (b), variation according to the luminosity curve, set up an each point and luminosity and change the signal adjustment curve that proportional curve is reciprocal relation, shown in Fig. 4 (c), in the horizontal signal is carried out the secondary adjustment, thereby the variation of luminosity of eliminating other regional light source further improves display effect to the influence of the vision signal of one's respective area.
In specific implementation, CCFL fluorescent tube luminous be because light distributes occurs changing, as the side emission etc.Therefore, add overall coefficient f (x) and relation is arranged with the distance of CCFL fluorescent tube and target pixel points or the shape of change CCFL fluorescent tube, thereby each area data correcting unit gives the different overall coefficients that adds to vision signal rectification meeting according to the shape of photodistributed variation of CCFL fluorescent tube and fluorescent tube, makes the picture of liquid crystal display displays satisfy homogeneity.
In an embodiment of the present invention, the CCFL fluorescent tube is a plurality of parallel forming a line as shown in Figure 1, further improve and be that the CCFL fluorescent tube can adopt the mode of multiple row multirow to arrange, direction as row has 5, perpendicular direction has 3,15 fluorescent tubes altogether, also can be arranged into other forms, arrangement mode for the multiple row multirow, can be in littler zone to the controlling of light emitting source, help the further reduction of energy consumption backlight, but the arrangement mode of this kind backlight, the brightness of calculating each pixel on perpendicular to the fluorescent tube direction also will be examined the influence of the brightness of other row fluorescent tube of filter to this pixel except the place one row fluorescent tube influence of examining each pixel of filter.
See also Fig. 5, of the present invention further the improvement is, amount to the mean flow rate ABL of each 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 ratio,, finally determine the pwm signal dutycycle again with initial adjustment ratio input area backlight signal control module 16 to entire backlight brightness by function, output Invertor circuit 18 is realized the dynamic control of backlight illumination.By 22 pairs of backlight adjustings of mean flow rate ABL (regulon), can improve when the picture mean flow rate is brighter, the visual fatigue that the luminous flux of whole image causes greatly further reduces energy consumption backlight.
Each signal processing unit of LCD television set backlight control system of the present invention and backlight control unit can partly or entirely be integrated into chip piece or integrate with other video frequency processing chip.
LCD TV backlight control method of the present invention is analyzed the video input signals that receives by the video signal analysis unit, and according to the video in each district backlight letter grey level distribution situation, produce the circuit signal of each regional light emitting source of control separately, each CCFL fluorescent tube is independently carried out brilliance control, thereby the subregion is controlled dynamically backlight illumination, reaches the saving power consumption, improves contrast, regulate the luminous flux size simultaneously, improve and watch comfort level.
Claims (15)
1, a kind of LCD TV backlight control method is characterized in that, said method comprising the steps of:
Maximal value or main value gray areas to the video gray scale of each backlight area are added up and are analyzed;
According to analysis result the vision signal of each backlight area is corrected; And
Generate the backlight control signal of each regional light emitting source of control separately according to analysis result, respectively each light emitting source is independently carried out luminosity and dynamically control.
2, the LCD TV backlight control method shown in claim 1, it is characterized in that, as follows according to the method that the peaked analysis result of the video gray scale of each backlight area is dynamically controlled the luminosity of light emitting source, if the gray level of the high grade grey level in certain backlight area is lower, then reduce or close the brightness of this regional light emitting source; If the gray level of the high grade grey level in certain zone mediates the stage, the suitable amplification of vision signal that then should the zone reduces this regional backlight illumination with corresponding ratio simultaneously; If the gray level of high grade grey level is higher, then vision signal is not processed, simultaneously backlightly do not adjust yet.
3, the LCD TV backlight control method shown in claim 1, it is characterized in that, the method that The result of statistics corrects each backlight area vision signal is as follows according to the main value gray areas of the video gray scale of each backlight area is carried out, determine the compensation coefficient or the correction curve of the video image of this backlight area according to the position of main value gray areas, regional vision signal is selectively amplified.
4, the LCD TV backlight control method shown in claim 1 or 2 is characterized in that, described method also comprises:
Set up an each point and luminosity and change the signal adjustment curve that proportional curve is reciprocal relation;
Backlight illumination according to subregion control is adjusted curve, through becoming ratio reciprocal vision signal is carried out the secondary adjustment.
5, the LCD TV backlight control method shown in claim 1 is characterized in that, described LCD TV backlight control method is to realize by the FPGA algorithm.
6, the LCD TV backlight control method shown in claim 1, it is characterized in that, described method comprises that also the mean flow rate ABL to each frame video signal calculates, and determines integrally-regulated coefficient is carried out in the brightness of all backlights according to result of calculation.
7, the LCD TV backlight control method shown in claim 1 is characterized in that, described main value gray areas is for comprising the more or more relatively gray scale equal portions corresponding gray scale zone of pixel quantity in backlight area.
8, the LCD TV backlight control method shown in claim 7 is characterized in that, definite method of described main value gray areas is:
The video gray scale is divided into several gray scale equal portions;
Add up the pixel quantity of each the gray scale equal portions in each backlight area respectively;
As ordinate, horizontal ordinate is several gray scale equal portions, sets up the histogram of grey level distribution with the cumulative number of each gray scale equal portions corresponding gray scale level of described backlight area;
Set a big threshold value and a little threshold value, compare to low gray scale equal portions from high gray scale equal portions then, if the quantity of in one's duty pixels such as certain gray scale is greater than big threshold value, then the gray areas of this gray scale equal portions correspondence is the main value gray areas, if there is not the quantity of pixel to find greater than big threshold value gray scale equal portions, then searching pixel quantity has a plurality of gray scale equal portions greater than little threshold value continuously, determines main value gray areas backlight in this way.
9, a kind of LCD television set backlight control system comprises converter circuit and a plurality of light emitting source, it is characterized in that described system also comprises:
The video signal analysis unit, be used for the receiving video signals input, screen area view data to each light emitting source correspondence is added up, and comprises the high grade grey level of the vision signal of directly searching in each light emitting source corresponding region or the main value gray areas in the corresponding region;
The area data correcting unit, described area data correcting unit is connected with described video signal analysis unit, and receiving video signals and analysis result are corrected this vision signal according to analysis result, are transferred to display unit again and show;
Zone backlight signal control module generates regional backlight control signal according to the analysis result of described video signal analysis unit and is transferred to described converter circuit;
Described converter circuit produces the circuit signal of controlling each light emitting source separately and gives light emitting source.
10, LCD television set backlight control system as claimed in claim 9 is characterized in that, described LCD television set backlight control system also comprises the mean flow rate regulon, described mean flow rate regulon join domain backlight signal control module.
11, as claim 9 or 10 described LCD television set backlight control systems, it is characterized in that each signal processing unit of described LCD television set backlight control system and backlight control unit can partly or entirely be integrated into chip piece or integrate with other chip.
12, LCD television set backlight control system as claimed in claim 9, it is characterized in that, described regional backlight signal control module is according to the high grade grey level or the main value gray areas of the vision signal in each light emitting source corresponding region, the light emitting source brightness of control corresponding region.
13, LCD television set backlight control system as claimed in claim 9 is characterized in that, described a plurality of light emitting sources are evenly to form a line or the mode of multiple row multirow is arranged.
14, LCD television set backlight control system as claimed in claim 9 is characterized in that, described main value gray areas is for comprising the more or more relatively gray scale equal portions corresponding gray scale zone of pixel quantity in backlight area.
15, LCD television set backlight control system as claimed in claim 14 is characterized in that, described main value gray areas is determined in the following manner:
The video gray scale is divided into several gray scale equal portions;
Add up the pixel quantity of each the gray scale equal portions in each backlight area respectively;
As ordinate, horizontal ordinate is several gray scale equal portions, sets up the histogram of grey level distribution with the cumulative number of each gray scale equal portions corresponding gray scale level of described backlight area;
Set a big threshold value and a little threshold value, compare to low gray scale equal portions from high gray scale equal portions then, if the quantity of in one's duty pixels such as certain gray scale is greater than big threshold value, then the gray areas of this gray scale equal portions correspondence is the main value gray areas, if there is not the quantity of pixel to find greater than big threshold value gray scale equal portions, then searching pixel quantity has a plurality of gray scale equal portions greater than little threshold value continuously, determines main value gray areas backlight in this way.
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