CN101567171A - Method and system for regulating backlight of liquid crystal display television - Google Patents
Method and system for regulating backlight of liquid crystal display television Download PDFInfo
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- CN101567171A CN101567171A CNA2008100668493A CN200810066849A CN101567171A CN 101567171 A CN101567171 A CN 101567171A CN A2008100668493 A CNA2008100668493 A CN A2008100668493A CN 200810066849 A CN200810066849 A CN 200810066849A CN 101567171 A CN101567171 A CN 101567171A
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Abstract
The invention is suitable to the technical field of liquid crystal display televisions and provides a method and a system for regulating backlight of a liquid crystal display television. The method comprises the following steps: a, the distance of between a watcher and the liquid crystal display television and the ambient brightness of the environment where the liquid crystal display television is in are detected, and then the average useful brightness value L of a liquid crystal display frame of the liquid crystal display television is determined; b, the backlight voltage of the liquid crystal display television is regulated according to the average useful brightness value L of the liquid crystal display frame, and the liquid crystal display television controls the backlight according to the backlight voltage. The technical scheme describes the relations of the ambient brightness, the distance between the watcher and the television, the watcher attribute and the liquid crystal display brightness, therefore, human eyesight is indirectly protected while the best sight sensibility is provided for the watcher, and the human eye protection and the frame reception effect are united.
Description
Technical field
The invention belongs to TV technology, relate in particular to the LCD TV backlight control technology.
Background technology
Existing liquid crystal TV set regulative mode backlight has two kinds of active and passive types.The active independent variable of normally will regulating is left the user for and is regulated voluntarily, and its realization is simpler; And realize the self-regulating passive type adjusting backlight that is referred to as backlight by external environment light feedback (as light sensor).The active regulative mode change real-time response of environmental change such as surround lighting size is to external world adjusted, and the variation of only adopting light sensor to detect external environment light realizes that LCD screen brightness mapping changes, be univariate, this single argument regulative mode exists shortcoming to be:
1, the extraneous brightness that obtains of pick-up unit (light sensor) environmental light brightness that can not represent human eye to experience fully.This is because pick-up unit is in different positions with human eye, influenced by light source position, and luminous energy is to disperse for the center point-like with the light source, and there is heterogeneity in on-the-spot brightness.
2, picture brightness only changes with surround lighting, and under the low ambient light illumination conditions such as night, picture brightness also decreases, and at this moment the beholder when far away slightly, just is difficult to enjoy variations in detail in the picture apart from picture; Otherwise under the contour by day ambient light condition, picture brightness also will improve, and at this moment the beholder is apart from picture when near slightly, easyly dazzles the eyes, nictation, dynamic menu flickering obviously strengthen human eye sense of discomfort and tired increasing.
3, in addition, differences such as beholder's age, sex, zone also have influence on actual visual experience.
Therefore,, should increase different pick-up units according to actual needs, introduce multivariate and detect regulating system backlight, its objective is that people-oriented, take into full account people's visual experience for passive type regulating system backlight.
Summary of the invention
The method and system that the object of the present invention is to provide a kind of LCD TV backlight to adjust, being intended to solve the LCD TV backlight that exists in the prior art can not be according to the self-adjusting problem of multivariate.
The present invention is achieved in that the method that a kind of LCD TV backlight is adjusted, and described method comprises the steps:
A, detection beholder determine the LCD screen picture average useful brightness value L of described LCD TV then from the distance of LCD TV and the environmental light brightness of LCD TV environment of living in according to testing result;
B, adjust described LCD TV backlight voltage according to described LCD screen picture average useful brightness value L, described LCD TV is backlight according to described Control of Voltage backlight.
Wherein step a specifically comprises:
The environmental light brightness of a1, the described LCD TV of detection environment of living in is determined optimal criteria brightness value L 2 according to testing result;
A2, detect the distance of beholder, obtain variable sighting distance, determine the LCD screen picture average useful brightness value L d of described variable sighting distance correspondence according to described optimal criteria brightness value L 2 and variable sighting distance from described LCD TV;
A3, determine described LCD screen picture average useful brightness value L according to described Ld.
Wherein step a1 specifically comprises:
Detect the environmental light brightness of described LCD TV environment of living in, determine described optimal criteria brightness value L 2 11 times for described environmental light brightness.
Wherein step a2 specifically comprises:
A21, detect the distance of beholder, obtain variable sighting distance from described LCD TV;
The sighting distance of a22, the described optimal criteria brightness value correspondence of setting is 3 times of described TV display screen height h, adopt default fixed value method to determine that sighting distance is the LCD screen picture average useful brightness value L 1 of 1h correspondence and the LCD screen picture average useful brightness value L 3 that sighting distance is the 3h correspondence, determine the LCD screen picture average useful brightness value L d of described variable sighting distance correspondence then.
Wherein step a3 specifically comprises:
Receive the attribute coefficients of user's input, equal the LCD screen average useful brightness value L d of described variable sighting distance correspondence and the product of described attribute coefficients is determined described LCD screen picture average useful brightness value L according to LCD screen picture average useful brightness value L.
Wherein step b specifically comprises:
B1, from PWM sampling spot register, read PWM sampling spot register value, adjust the voltage backlight of described LCD TV then according to described sampling spot register value according to described LCD screen picture average useful brightness value L;
B2, described LCD TV are backlight according to described Control of Voltage backlight.
The system that the present invention also provides a kind of LCD TV backlight to adjust, described system comprises distance detecting module, surround lighting detection module, MCU and backlight control module, wherein:
Described distance detecting module links to each other with described MCU, is used for detecting the variable sighting distance of beholder from LCD TV, and is used for testing result is transferred to described MCU;
Described surround lighting detection module links to each other with described MCU, is used for detecting the residing environmental light brightness of described LCD TV, and is used for testing result is transferred to described MCU;
Described MCU is used for determining LCD screen picture average useful brightness value L according to the testing result of described surround lighting detection module and the transmission of distance detecting module, and is used for determining to export to described backlight control module behind the described LCD TV backlight voltage according to described screen average useful brightness value L;
Described backlight control module links to each other with described MCU, is used for adjusting described LCD TV backlight according to the voltage backlight of described MCU output.
Described system also comprises spectators' attribute load module, be used for the brilliant televiewer's input attributes of feed flow coefficient, described MCU is used for determining LCD screen picture average useful brightness value L according to the testing result and the described attribute coefficients of described surround lighting detection module and the transmission of distance detecting module.
Described MCU is used for determining optimal criteria brightness value L 2 according to the testing result of described surround lighting detection module transmission, and be used for determining the LCD screen picture average useful brightness value L d of described variable sighting distance correspondence according to the testing result of distance detecting module transmission, equal the LCD screen average useful brightness value L d of described variable sighting distance correspondence and the product of described attribute coefficients is determined described LCD screen picture average useful brightness value L according to LCD screen picture average useful brightness value L.
Described system also comprises PWM sampling spot register, described MCU is used for reading PWM sampling spot register value according to described liquid crystal mesogens screen-picture average useful brightness value L from PWM sampling spot register, determines the voltage backlight of described LCD TV according to described sampling spot register value.
The present invention overcomes the deficiencies in the prior art; adopt and detect and the closely-related factor of beholder's visual experience; as the distance of beholder apart from TV screen; environmental light brightness etc.; adjust LCD TV backlight according to testing result and beholder's attribute then; thereby realize self-adjusting technical scheme to television image brightness; technical scheme provided by the invention is considered surround lighting; the beholder is apart from the distance of TV screen; concern between beholder's attribute and the liquid crystal display brightness; when giving the user with the optimum visual impression; the indirect protection human eyesight is realized the harmony of human eye protection and picture view reception effect.
Description of drawings
Fig. 1 is the described regulating system theory diagram backlight of the embodiment of the invention;
Fig. 2 be the described L1 of the embodiment of the invention, L2 and L3 respectively with the corresponding relation of h, 2h and 3h;
Fig. 3 is an embodiment of the invention process flow diagram.
Embodiment
The technical scheme that the embodiment of the invention provides is: detect and the closely-related factor of televiewer's visual experience, as spectators apart from the distance of TV screen, environmental light brightness etc., adjust television image brightness according to testing result then, thereby realize automatic adjustment television image brightness.
The method that the embodiment of the invention provides comprises following step:
1, surround lighting detection module testing environment luminance brightness, MCU calculates optimal criteria brightness value L 2 according to testing result then, determines that promptly surround lighting coefficient Ls is 1.0;
2, the distance detecting module detects the distance of beholder apart from TV screen, and MCU calculates the picture average useful brightness value L d of variable sighting distance correspondence according to testing result then;
3, the user selects age attribute coefficients δ according to the situation of self;
4, MCU is according to L=L
S* L
d* δ calculates the average useful brightness L of LCD screen picture;
5, television system is determined backlight control voltage according to L, realizes the adjustment to LCD TV backlight.
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.
Detecting the beholder is that its adaptability to screen intensity also is embodied in the distance of screen last by the complicacy decision of human eye from the reason of the distance of LCD TV.The beholder is near more from the distance of picture, and it is intense strong that human eye is experienced the picture polished bard, and eyes are easy more not to feel well and fatigue, can increase as blink, shed tears, dry and astringent etc.; Otherwise the beholder is far away to the picture distance, and picture brightness such as inappropriate raising, just human eye feels that picture is dark, grey, detail section is difficult to embody.
The reason of ambient light is that experience shows human eye perceives the most comfortable when both ratio is about 11: 1 because TV set image brightness and surround lighting magnitude relationship are close.The illumination requirement that the architectural lighting design standards provides the residential architecture living room is 100lx, and brightness is about 20～24cd/m
2, brightness is set is 260cd/m to television image under this surround lighting
2Effect is better.Television image brightness is too high or too low all bad, and excessively low image level sense is relatively poor, and too high picture contrast is strong, color glow.But under the higher condition of picture brightness, watch LCD TV can feel that eyes do not accommodate fatigue for a long time, as blink, shed tears, dry and astringent etc., this for just in budding teenager's visual acuity affected more very.
Differences such as beholder's attribute itself such as age, sex, zone also have influence on actual visual experience.The ophthalmology physiologic theory shows that the beholder is the key factor that influences visual effect at the age.With advancing age, human eye obviously descends to the CSF of visual signal.Under the normal vision condition, the main cause of the decrease of contrast sensitivity that the age is relevant is that the photoreceptor quantity that aging causes reduces and the variation of neural basis.Simultaneously, the elderly significantly descends to the analysis and the extraction rate of visual signal, and reflection postpones to rise appreciably, and to the also constantly decline of susceptibility of wavelength, thereby causes the resolving ability of colour vision and spatial variations is also descended thereupon, and these all can make visual quality descend.The method that the embodiment of the invention provides is that television screen brightness is changed to some extent at all ages and classes colony, for the teenager, suitably reduces screen intensity also can realize view reception effect preferably, and helps organs of vision protection; For the elderly, suitably improve the variation of screen intensity with the vision physiological organ that remedies them, be to reach view reception effect preferably equally.
Fig. 1 is the regulating system theory diagram backlight that the embodiment of the invention provides, and comprises surround lighting detection module, distance detecting module, beholder's attribute load module, MCU (microprogram control unit), PWM sampling spot register and backlight control unit.Wherein, surround lighting detection module and distance detecting module are used for testing environment luminance brightness and the beholder distance apart from television screen respectively, detected signal is transferred to MCU after the A/D conversion, beholder's attribute load module is used for importing its attribute for the beholder, this attribute is selected corresponding coefficient by the user according to the situation of self, MCU determines optimal criteria brightness value L 2 according to the testing result of surround lighting detection module transmission, determine that simultaneously surround lighting coefficient Ls is 1.0, MCU calculates according to the testing result of optimal criteria brightness value and the transmission of distance detecting module and determines picture average useful brightness value L d, then age attribute coefficients δ and the Ls that imports according to the user, Ld and L=L
S* L
d* δ calculates the average useful brightness L of LCD screen picture, reads value in the PWM sampling spot register according to L then, is transferred to backlight control unit.
Light activated element in the described surround lighting detection module can adopt light sensor, and the distance detecting module can adopt the ultrasonic measurement device, above-mentioned two modules and MCU combination, the common detection that realizes ambient light and viewing distance.Adopt light activated element to realize that surround lighting detects and the ultrasonic distance detection has been mature technology at present, realize that principle and physical circuit repeat no more herein.
Described MCU can be waited as 8051 or 8098 by single-chip microcomputer and bear.Along with the development of liquid crystal tv technology, this part chip functions can be integrated in original Video processing control chip and realize, for convenience, will abbreviate the MCU module as by this part functional processing module here.
For convenience of explanation, at first following two keywords are made an explanation: optimum viewing distance and optimal criteria brightness value L.
Optimum viewing distance with reference to the definition of Consultative Committee on International Radio (CCIR) (CCIR) is: when viewing distance was three times of screen height, the high-definition television system display effect should equal or approach the when participating in the cintest sensation of a twenty-twenty vision person when watching former what comes into a driver's thing or demonstration.Various because of the TV size, its screen height difference for ease of explanation, is represented screen height with alphabetical h, and this is a variable.
The optimal criteria brightness value is defined as beholder's LCD screen picture average useful brightness value corresponding with beholder's current environmental light brightness when optimum viewing distance (3h), experience shows human eye perceives the most comfortable when both ratio is about 1: 11, illustrate be exactly when environmental light brightness be 30cd/m
2The time, at this moment LCD screen picture average useful brightness value should be 330cd/m
2Because of user's environment for use may change, so the optimal criteria brightness value is also followed variation.But after user's environment for use light was determined, the optimal criteria brightness value determined thereupon that also the optimal criteria brightness value is a certain value in this case.In other words, surround lighting decision optimal criteria brightness value after the surround lighting of average family is determined, is controlled through MCU by ambient light detection device, and surround lighting is also pressed in optimal criteria brightness and 1: 11 relation of LCD screen picture average useful brightness value is determined.
Illustrate between each variable below in conjunction with Fig. 2 to change and the relation of backlight illumination that the point of L1, L2 and L3 correspondence is respectively a, b and c 3 points among the figure.Horizontal ordinate is represented the distance of beholder apart from screen, and h represents with the screen height size, the corresponding 3h of optimum viewing distance, and its unit is m (rice).Ordinate is represented LCD screen picture average useful brightness value, and its unit is cd/m
2The optimal criteria brightness value of optimum viewing distance 3h correspondence is L2cd/m
2When the beholder moves to h by 3h, the corresponding L1cd/m of LCD screen picture average useful brightness value
2Otherwise, when the beholder moves to 6h by 3h, the corresponding L3cd/m of LCD screen picture average useful brightness value
2For making the beholder be in best rating state all the time, set L3＞L2＞L1, and linear successively decreasing.Popular explanation is exactly that the beholder when near, reduces screen intensity apart from TV screen; Otherwise when far away, improve screen intensity apart from screen.Net result is exactly that people-oriented, realizes the harmony of human eye protection and picture view reception effect.
Below specify:
At first determine L2.The optimal criteria brightness value of optimum viewing distance 3h correspondence is exactly L2, and its numerical values recited is determined by television system environment for use light.The surround lighting detection module detects after the environmental light brightness, and testing result is transferred to MCU, and MCU determines optimal criteria brightness L2 according to surround lighting and 1: 11 relation of LCD screen picture average useful brightness value.After L2 determined, surround lighting coefficient Ls also was given as 1.0 like this.
Secondly to obtain the picture average useful brightness value L d of variable sighting distance correspondence, this value is after user's environment for use is determined, also promptly on the basis of L2, detect the residing horizon range of beholder by the sighting distance detection module, between above-mentioned 1h and 6h, then corresponding L1 and the L3 of obtaining, after L1 and L3 two-end-point were determined, the variation value in the middle of it can be realized with program software.
So how obtain L1 and L3? present embodiment provides a kind of simple reference design thinking: default fixed value method.After L1 and L3 two-end-point were determined, the variation value in the middle of it was easy to realize with program software like this.
Default fixed value method is to obtain TV according to market survey to use the requirement of laying to televisor of general context, position, common household, obtain the frequent TV of seeing of most users and, set corresponding LCD screen picture average useful brightness value apart from as with reference to foundation.As the corresponding 6h of L3, be example with 42 cun high cls, its effective rating height is 0.52m, 6h promptly is 6 * 0.52=3.12m.Can set the corresponding LCD of 6h sighting distance this moment
Max(l) cd/m
2, be exactly the maximum nominal brightness value of liquid crystal display screen, this value can obtain by looking into the LCD screen specifications.1h can set 0.2 * LCD
Max(l) cd/m
2, i.e. the maximum nominal brightness value of 0.2 times liquid crystal display screen.The flexible processing mode is more: open the sighting distance setting value of L1 and L3 correspondence to the user, the sighting distance of and maximum LCD screen picture average useful brightness value correspondence minimum by the autonomous setting screen of user is to adapt to the difference demand of Different Individual.The method of MCU control and treatment is that the brightness between calculating in real time from L1 to L3 according to liquid crystal television system default setting L1 and L3 changes, or by open L1 and the brightness variation of L3 value between calculating in real time from L1 to L3 to user's input.Behind definite L1 and L3 two-end-point, computing method of brightness are realized by program software in the middle of it like this.
The following describes after L1 and L3 two-end-point are determined, the variation value in the middle of it is with the realization principle of program software.As mentioned above, brightness value when the corresponding respectively viewing distance of L1 and L3 is 1h and 6h, when when L3 changes to L1, total brightness variable quantity is Δ L=L3-L1, total sighting distance change amount is Δ D=6h-1h, the precision of supposing distance detection device is 0.05 a meter/step-length, and then the brightness changing quantity during each unit step-length (0.05 meter of stepping) is θ L=Δ L/ (Δ D/0.05)=20 Δ L/ Δ D.Like this when known L1 and L3, it MCU inner corresponding two corresponding setting values of brilliance control register, the minor alteration of sighting distance can obtain by distance detection device, the minor alteration of sighting distance is the change θ L of corresponding brightness again, like this in MCU inside, when when L1 changes to L3, variable quantity of brightness is exactly in the middle of it: L1+ θ L * Z (Z is for asking a little number of steps from L1 in advance to the centre of L3); When changing to L1 from L3, variable quantity of brightness is exactly in the middle of it: L3-θ L * Z (Z is for asking a little number of steps from L3 in advance to the centre of L1).
Need to prove that L2 is different to the effect of LCD TV with Ld, then L2 also determines thereupon after surround lighting is determined, and Ld will follow the distance of beholder and televisor and change, and it is the variation on the L2 basis.When the beholder was near apart from televisor, picture brightness will reduce, the lower limit that brightness reduces be backlight reduce to minimum; Otherwise when the beholder was far away apart from televisor, picture brightness will improve, and the upper limit that brightness improves is the maximum brightness value that reaches the nominal of LCD TV specifications.
Be that MCU finishes automatically according to L2 and Ld to adjusting backlight in addition, if manual intervention, that is exactly the sighting distance value of open L1 and L3 correspondence, be provided with voluntarily by the user, and be the TV room space size of placing etc. with reference to factor.By the sighting distance of user, adapt to the difference demand of Different Individual on the software by autonomous setting screen minimum of TV remote controller and maximum brightness value correspondence.Like televiewing at a distance if any the people, then just can be set at the sighting distance of L3 correspondence greater than 6h such as 8h or 10h equivalence by 6h, otherwise also the sighting distance of L1 correspondence can be set at 0.5h or 0.8h equivalence by 1h, certainly only the variation of total sighting distance change amount Δ D for program, the implementation algorithm of program is constant, but can adapt to the difference demand of Different Individual.
Be to determine attribute coefficients δ the age once more according to the beholder.This parameter is open to the beholder, selects " the young and the middle aged ", " teenager " and " old age " to realize that beholder's age attribute default setting can be " the young and the middle aged " by the user by telepilot.
Another one problem in the enforcement is determining of beholder's attribute difference δ.The ophthalmology physiologic theory shows that " standard beholder " age is the key factor that influences visual effect.The embodiment of the invention makes television screen brightness change to some extent at all ages and classes colony, simply says to be exactly the age-based stage to set different backlight illumination coefficients.It is 1.0 that young and middle-aged people can establish δ, and it is 0.7～0.9 that the teenager can establish δ, and it is 1.1～1.3 etc. that the elderly can establish δ.
More than comprehensive, last, MCU is according to formula 3L=L
S* L
d* δ calculates the average useful brightness L of LCD screen picture,
L=L
S* L
d* δ (formula 3)
In the formula:
L LCD screen picture average useful brightness value, unit is cd/m
2
L
SThe surround lighting coefficient, the optimal criteria brightness value corresponds to 1.0, promptly top L2cd/m
2The time correspond to 1.0, determine by user's environment for use.
L
dBe the LCD screen average useful brightness value of variable sighting distance correspondence, unit is cd/m
2
δ is the age attribute coefficients, and the age-based stage is set different backlight illumination coefficients.Young and middle-aged people is made as 1.0, and the teenager is made as 0.7～0.9, and the elderly is made as 1.1～1.3.
The corresponding relation between average useful brightness L of the LCD screen picture of Ming Dynasty style 3 and the LCD TV backlight regulated quantity for example below.Because it is not luminous to constitute the liquid crystal molecule of Liquid Crystal Module itself, its light source comes from external unit, as cold-cathode fluorescence lamp CCFL (Cold Cathode Fluorescent Lamp) and LED (LightEmitting Diode light emitting diode) etc.Because CCFL technology maturation and price advantage are the main flow backlights of LCD MODULE, its size of current determines lighting tube brightness at present, and being reflected on the televisor by liquid crystal module is exactly the size of picture brightness.And what generally control the CCFL size of current is that backlight control voltage by video processing module (present embodiment middle finger MCU) output carries out.Common voltage VBR range of control backlight is 0～3.3V (this scope is provided by the LCD screen specifications), the corresponding VBR=0V of minimum brightness, the corresponding VBR=3.3V of high-high brightness.In liquid crystal television system, backlight control voltage generally adopts PWM (the Pulse Width Modulation width modulation) way of output to give the Liquid Crystal Module backlight control unit behind smothing filtering, and the PWM waveform calculates generation by program by the sampling value that reads in the control register in the liquid crystal video processing module.For 8 (bit) registers, its range of adjustment is 0～255, and is corresponding with the VBR linear mapping.When VBR=0V, this moment the backlight brightness values minimum, the setting value in the corresponding PWM sampling spot register is 00; When VBR=3.3V, this moment the backlight brightness values maximum, the setting value in the corresponding PWM sampling spot register is 255.Like this in liquid crystal television system, the average useful brightness L of LCD screen picture just connects by PWM sampling spot register and backlight illumination, read value in the PWM sampling spot register by program, specifically, design phase in LCD TV is made tables of data, L is related with the value of PWM sampling spot register corresponding, simply say to be exactly when L is maximum, the setting value in the PWM sampling spot register also is maximum; When L hour, the setting value in the PWM sampling spot register also is minimum.For example during practical application, the PWM sampling spot register value of correspondence is 180 when L2, and at this moment the register value of L1 correspondence can be 30, and the register value of L3 correspondence can be 255.The pulse width of PWM waveform is that dutycycle changes, and also follows variation for behind smothing filtering the VBR of Liquid Crystal Module backlight control unit.After if MCU draws the value of L, then control VBR and just can realize adjusting LCD TV backlight by changing setting value in the PWM sampling spot register.
As mentioned above, embodiment of the invention process flow diagram specifically comprises following step as shown in Figure 3:
1, the surround lighting detection module detects the environmental light brightness of televisor environment of living in, and the distance detecting module detects the distance of spectators apart from television display screen, and testing result is transferred to MCU;
2, MCU calculates L2 according to the result of surround lighting detection module transmission, and determines the Ld of variable sighting distance correspondence according to the result of distance detecting module transmission;
3, MCU is according to L=L
S* L
d* δ determines L, and wherein Ls is defined as 1.0;
4, MCU exports to backlight control unit according to the value that L reads in the PWM sampling spot register;
5, backlight control unit is according to the control of the value in the PWM sampling spot register that receives VBR.
Described beholder's attribute can be age, sex, zone etc., and the age attribute coefficients δ that only provides " standard beholder " here is in order to simplify description, to realize that for difference attributes such as sexes principle is identical, should being considered as within protection domain of the present invention.
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, a kind of method of LCD TV backlight adjustment is characterized in that described method comprises the steps:
A, detection beholder determine the LCD screen picture average useful brightness value L of described LCD TV then from the distance of LCD TV and the environmental light brightness of LCD TV environment of living in according to testing result;
B, adjust described LCD TV backlight voltage according to described LCD screen picture average useful brightness value L, described LCD TV is backlight according to described Control of Voltage backlight.
2, method according to claim 1 is characterized in that, wherein step a specifically comprises:
The environmental light brightness of a1, the described LCD TV of detection environment of living in is determined optimal criteria brightness value L 2 according to testing result;
A2, detect the distance of beholder, obtain variable sighting distance, determine the LCD screen picture average useful brightness value L d of described variable sighting distance correspondence according to described optimal criteria brightness value L 2 and variable sighting distance from described LCD TV;
A3, determine described LCD screen picture average useful brightness value L according to described Ld.
3, method according to claim 2 is characterized in that, wherein step a1 specifically comprises:
Detect the environmental light brightness of described LCD TV environment of living in, determine described optimal criteria brightness value L 2 11 times for described environmental light brightness.
4, method according to claim 2 is characterized in that, wherein step a2 specifically comprises:
A21, detect the distance of beholder, obtain variable sighting distance from described LCD TV;
The sighting distance of a22, the described optimal criteria brightness value correspondence of setting is 3 times of described TV display screen height h, adopt default fixed value method to determine that sighting distance is the LCD screen picture average useful brightness value L 1 of 1h correspondence and the LCD screen picture average useful brightness value L 3 that sighting distance is the 3h correspondence, determine the LCD screen picture average useful brightness value L d of described variable sighting distance correspondence then.
5, method according to claim 2 is characterized in that, wherein step a3 specifically comprises:
Receive the attribute coefficients of user's input, equal the LCD screen average useful brightness value L d of described variable sighting distance correspondence and the product of described attribute coefficients is determined described LCD screen picture average useful brightness value L according to LCD screen picture average useful brightness value L.
6, method according to claim 1 is characterized in that, wherein step b specifically comprises:
B1, from PWM sampling spot register, read PWM sampling spot register value, adjust the voltage backlight of described LCD TV then according to described sampling spot register value according to described LCD screen picture average useful brightness value L;
B2, described LCD TV are backlight according to described Control of Voltage backlight.
7, a kind of system of LCD TV backlight adjustment is characterized in that described system comprises distance detecting module, surround lighting detection module, MCU and backlight control module, wherein:
Described distance detecting module links to each other with described MCU, is used for detecting the variable sighting distance of beholder from LCD TV, and is used for testing result is transferred to described MCU;
Described surround lighting detection module links to each other with described MCU, is used for detecting the residing environmental light brightness of described LCD TV, and is used for testing result is transferred to described MCU;
Described MCU is used for determining LCD screen picture average useful brightness value L according to the testing result of described surround lighting detection module and the transmission of distance detecting module, and is used for determining to export to described backlight control module behind the described LCD TV backlight voltage according to described screen average useful brightness value L;
Described backlight control module links to each other with described MCU, is used for adjusting described LCD TV backlight according to the voltage backlight of described MCU output.
8, system according to claim 7, it is characterized in that, described system also comprises spectators' attribute load module, be used for the brilliant televiewer's input attributes of feed flow coefficient, described MCU is used for determining LCD screen picture average useful brightness value L according to the testing result and the described attribute coefficients of described surround lighting detection module and the transmission of distance detecting module.
9, system according to claim 8, it is characterized in that, described MCU is used for determining optimal criteria brightness value L 2 according to the testing result of described surround lighting detection module transmission, and be used for determining the LCD screen picture average useful brightness value L d of described variable sighting distance correspondence according to the testing result of distance detecting module transmission, equal the LCD screen average useful brightness value L d of described variable sighting distance correspondence and the product of described attribute coefficients is determined described LCD screen picture average useful brightness value L according to LCD screen picture average useful brightness value L.
10, system according to claim 7, it is characterized in that, described system also comprises PWM sampling spot register, described MCU is used for reading PWM sampling spot register value according to described liquid crystal mesogens screen-picture average useful brightness value L from PWM sampling spot register, determines the voltage backlight of described LCD TV according to described sampling spot register value.
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| CNA2008100668493A Pending CN101567171A (en) | 2008-04-25 | 2008-04-25 | Method and system for regulating backlight of liquid crystal display television |
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| CN101887705A (en) * | 2010-06-29 | 2010-11-17 | 彩虹集团公司 | Direct type white light LED backlight source control device |
| CN102186027A (en) * | 2011-04-22 | 2011-09-14 | 深圳创维－Rgb电子有限公司 | Eyestrain preventing television and method |
| CN102314848A (en) * | 2011-09-09 | 2012-01-11 | 深圳Tcl新技术有限公司 | Backlight-control method and system for liquid-crystal display device |
| CN102821210A (en) * | 2012-08-21 | 2012-12-12 | 广东欧珀移动通信有限公司 | Power-saving method for reading with intelligent terminal |
| CN103531174A (en) * | 2013-10-29 | 2014-01-22 | 京东方科技集团股份有限公司 | Brightness adjusting device and method |
| CN103634968A (en) * | 2012-08-23 | 2014-03-12 | 联想(北京)有限公司 | Backlight control method and apparatus |
| CN104134433A (en) * | 2014-07-15 | 2014-11-05 | 深圳市赛亿科技开发有限公司 | Method for automatically adjusting the brightness of display screen |
| CN104267607A (en) * | 2014-09-10 | 2015-01-07 | 京东方科技集团股份有限公司 | Method and device for adjusting indoor light brightness and intelligent home control system |
| CN104575447A (en) * | 2015-02-11 | 2015-04-29 | 京东方科技集团股份有限公司 | Brightness adjusting device and method thereof and display |
| CN104599650A (en) * | 2015-01-06 | 2015-05-06 | 宏祐图像科技(上海)有限公司 | Intelligent de-Mura modulation method without losing video image brightness |
| CN104717365A (en) * | 2015-03-30 | 2015-06-17 | 京东方科技集团股份有限公司 | Brilliance regulating system and method and mobile terminal |
| CN104767888A (en) * | 2015-04-16 | 2015-07-08 | 广东欧珀移动通信有限公司 | Screen brightness adjusting method and device |
| CN105244008A (en) * | 2015-11-09 | 2016-01-13 | 深圳市华星光电技术有限公司 | Display equipment and brightness adjusting method thereof |
| CN106157926A (en) * | 2015-03-23 | 2016-11-23 | 中兴通讯股份有限公司 | A kind of method and device regulating brightness of display screen |
| CN106534731A (en) * | 2016-10-28 | 2017-03-22 | 深圳创维－Rgb电子有限公司 | Television smart control method, device, equipment and system |
| CN107040813A (en) * | 2017-04-11 | 2017-08-11 | 江苏邦融微电子有限公司 | It is a kind of to avoid apart from TV near method for early warning excessively |
| CN107545866A (en) * | 2017-09-06 | 2018-01-05 | 合肥同诺文化科技有限公司 | The photosensitive brightness self-adjusting system of display screen |
| CN107786879A (en) * | 2017-11-01 | 2018-03-09 | 成都吱吖科技有限公司 | A kind of intelligent television broadcasting background regulation device |
| CN108174297A (en) * | 2018-01-24 | 2018-06-15 | 深圳市康冠商用科技有限公司 | Picture frame television set |
| CN110111747A (en) * | 2019-04-24 | 2019-08-09 | 上海闻泰电子科技有限公司 | Adjust the method and device of screen backlight |
| CN112365861A (en) * | 2020-10-26 | 2021-02-12 | 深圳Tcl新技术有限公司 | Display image adjusting method, electronic device and computer readable storage medium |
| WO2021047379A1 (en) * | 2019-09-11 | 2021-03-18 | 深圳创维－Rgb电子有限公司 | Television and backlight control method therefor, control device, and readable storage medium |
| CN113628593A (en) * | 2021-07-13 | 2021-11-09 | 深圳康佳电子科技有限公司 | Backlight control method, display terminal and storage medium |
| WO2022041078A1 (en) * | 2020-08-27 | 2022-03-03 | 南京英维尔科技服务有限公司 | Television set capable of automatically adjusting brightness and control method therefor |
| WO2022227901A1 (en) * | 2021-04-30 | 2022-11-03 | 北京字节跳动网络技术有限公司 | Luminance adjustment method and apparatus for lighting device, electronic equipment, and storage medium |
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| CN101887705A (en) * | 2010-06-29 | 2010-11-17 | 彩虹集团公司 | Direct type white light LED backlight source control device |
| CN102186027A (en) * | 2011-04-22 | 2011-09-14 | 深圳创维－Rgb电子有限公司 | Eyestrain preventing television and method |
| CN102314848A (en) * | 2011-09-09 | 2012-01-11 | 深圳Tcl新技术有限公司 | Backlight-control method and system for liquid-crystal display device |
| CN102821210A (en) * | 2012-08-21 | 2012-12-12 | 广东欧珀移动通信有限公司 | Power-saving method for reading with intelligent terminal |
| CN103634968A (en) * | 2012-08-23 | 2014-03-12 | 联想(北京)有限公司 | Backlight control method and apparatus |
| CN103634968B (en) * | 2012-08-23 | 2016-03-30 | 联想(北京)有限公司 | A kind of method and device controlling backlight |
| CN103531174A (en) * | 2013-10-29 | 2014-01-22 | 京东方科技集团股份有限公司 | Brightness adjusting device and method |
| CN104134433A (en) * | 2014-07-15 | 2014-11-05 | 深圳市赛亿科技开发有限公司 | Method for automatically adjusting the brightness of display screen |
| US9723690B2 (en) | 2014-09-10 | 2017-08-01 | Boe Technology Group Co., Ltd. | Method and device for adjusting indoor brightness and smart home control system |
| CN104267607A (en) * | 2014-09-10 | 2015-01-07 | 京东方科技集团股份有限公司 | Method and device for adjusting indoor light brightness and intelligent home control system |
| CN104599650A (en) * | 2015-01-06 | 2015-05-06 | 宏祐图像科技(上海)有限公司 | Intelligent de-Mura modulation method without losing video image brightness |
| CN104575447A (en) * | 2015-02-11 | 2015-04-29 | 京东方科技集团股份有限公司 | Brightness adjusting device and method thereof and display |
| CN106157926A (en) * | 2015-03-23 | 2016-11-23 | 中兴通讯股份有限公司 | A kind of method and device regulating brightness of display screen |
| CN104717365B (en) * | 2015-03-30 | 2017-05-10 | 京东方科技集团股份有限公司 | Brilliance regulating system and method and mobile terminal |
| CN104717365A (en) * | 2015-03-30 | 2015-06-17 | 京东方科技集团股份有限公司 | Brilliance regulating system and method and mobile terminal |
| US9886933B2 (en) | 2015-03-30 | 2018-02-06 | Boe Technology Group Co., Ltd. | Brightness adjustment system and method, and mobile terminal |
| CN104767888A (en) * | 2015-04-16 | 2015-07-08 | 广东欧珀移动通信有限公司 | Screen brightness adjusting method and device |
| CN105244008B (en) * | 2015-11-09 | 2017-12-15 | 深圳市华星光电技术有限公司 | A kind of display device and its brightness adjusting method |
| CN105244008A (en) * | 2015-11-09 | 2016-01-13 | 深圳市华星光电技术有限公司 | Display equipment and brightness adjusting method thereof |
| CN106534731A (en) * | 2016-10-28 | 2017-03-22 | 深圳创维－Rgb电子有限公司 | Television smart control method, device, equipment and system |
| CN107040813A (en) * | 2017-04-11 | 2017-08-11 | 江苏邦融微电子有限公司 | It is a kind of to avoid apart from TV near method for early warning excessively |
| CN107545866A (en) * | 2017-09-06 | 2018-01-05 | 合肥同诺文化科技有限公司 | The photosensitive brightness self-adjusting system of display screen |
| CN107786879B (en) * | 2017-11-01 | 2020-11-27 | 安徽省鑫林电器科技有限公司 | Play background regulation and control device for smart television |
| CN107786879A (en) * | 2017-11-01 | 2018-03-09 | 成都吱吖科技有限公司 | A kind of intelligent television broadcasting background regulation device |
| CN108174297A (en) * | 2018-01-24 | 2018-06-15 | 深圳市康冠商用科技有限公司 | Picture frame television set |
| CN110111747A (en) * | 2019-04-24 | 2019-08-09 | 上海闻泰电子科技有限公司 | Adjust the method and device of screen backlight |
| WO2021047379A1 (en) * | 2019-09-11 | 2021-03-18 | 深圳创维－Rgb电子有限公司 | Television and backlight control method therefor, control device, and readable storage medium |
| US11388363B2 (en) | 2019-09-11 | 2022-07-12 | Shenzhen Skyworth-Rgb Electronic Co., Ltd. | TV set and backlight control method, control device and readable storage medium of the TV set |
| WO2022041078A1 (en) * | 2020-08-27 | 2022-03-03 | 南京英维尔科技服务有限公司 | Television set capable of automatically adjusting brightness and control method therefor |
| CN112365861A (en) * | 2020-10-26 | 2021-02-12 | 深圳Tcl新技术有限公司 | Display image adjusting method, electronic device and computer readable storage medium |
| CN112365861B (en) * | 2020-10-26 | 2022-07-08 | 深圳Tcl新技术有限公司 | Display image adjusting method, electronic device and computer readable storage medium |
| WO2022227901A1 (en) * | 2021-04-30 | 2022-11-03 | 北京字节跳动网络技术有限公司 | Luminance adjustment method and apparatus for lighting device, electronic equipment, and storage medium |
| CN113628593A (en) * | 2021-07-13 | 2021-11-09 | 深圳康佳电子科技有限公司 | Backlight control method, display terminal and storage medium |
| CN115695690A (en) * | 2022-11-09 | 2023-02-03 | 四川长虹电器股份有限公司 | Method and device for automatically adjusting brightness of television screen |
| CN115695690B (en) * | 2022-11-09 | 2024-04-26 | 四川长虹电器股份有限公司 | Automatic regulating method for television screen brightness |
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Application publication date: 20091028 |