CN103024320A - Method and device for compensating image brightness automatically under liquid crystal television dynamic backlight - Google Patents
Method and device for compensating image brightness automatically under liquid crystal television dynamic backlight Download PDFInfo
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Abstract
The invention discloses a method and device for compensating image brightness automatically under liquid crystal television dynamic backlight and relates to liquid crystal television dynamic backlight and image brightness adjusting technology. The method and device is simple and reliable and aims at solving the problem that image brightness lowers due to the fact that a backlight range is reduced under the dynamic backlight. The method mainly includes the following steps: a dynamic backlight target value obtaining step: reading a dynamic backlight target value output by the dynamic backlight module; a contrast compensation maximum value obtaining step; a contrast user value obtaining step: converting a current user menu contrast into a contrast user value B according to a mapping relation f; a compensation method selecting step: if a backlight target value is smaller than a compensation upper limit, performing a step of contrast compensation; and the contrast compensation step including a contrast compensation middle value calculating step, a contrast compensation final value compensating step and the like.
Description
Technical field
The present invention relates to LCD TV dynamic backlight and image brightness adjustment technology, particularly LCD TV is because adopting dynamic backlight to cause image brightness automatic compensating method and device in the image brightness decline situation.
Background technology
The power consumption of LCDs accounts for the major part of whole LCD TV power consumption.Reduce the demand of energy consumption, expedited the emergence of multiple dynamic backlight technology, software systems are carried out calculating backlight and control according to dynamic picture material, when the constant backlight brightness of the high-amplitude of unnecessary maintenance, turn down suitably backlight illumination.For example domestic mandate patent of invention 201010300512.1 discloses a kind of dynamic backlight technology, its key step is: obtain present image and it is temporarily stored in the memory, utilize luminance equation Gray=0.3 * R+0.59 * G+0.11 * B to obtain the gray value of each pixel, then add up the number of pixels of every kind of gray scale, calculate the average gray of whole two field picture according to the pixel quantity of gray value and this gray value
, then determine pwm value or the duty ratio (seeing the 3rd ~ 4 page of this patent announcement textual description book for details) of adjusting pwm signal backlight according to gradation of image mean value, in addition, domestic patent application 201010128036.X also discloses a kind of regulation technology backlight.
Compare with the constant backlight brightness that keeps high-amplitude, after dynamic reducing is backlight, can feel that visually image brightness descends, image level reduces, some unborn details and the depth of field all are affected, and that is to say image quality decrease, cause easily visual fatigue.In the case, the solution that the user is general is to close dynamic backlight, has so just lost the original intention of dynamic backlight reduction energy consumption; Perhaps manually image brightness, contrast are increased, can change to bright field to details in a play not acted out on stage, but told through dialogues like this, but when playing bright picture, blocking of the highlighted value part of picture will occur, need again image brightness, contrast to be lowered, this mode is too loaded down with trivial details and inconvenient for the user again.
In order to overcome these problems, many compensation techniques have been proposed for the image brightness compensation after backlight the dimming, and wherein comprise methods such as improving LCD light transmittance, the growth of LCD signal linear amplitude, GAMMA data correction.The part measure is fairly simple in the said method, causes that easily colour temperature changes, the problems such as blocking of contour, picture high luminance values appear in image, and the part measure exists computing comparatively complicated, and concrete the application has difficulties.
Summary of the invention
The problem that the present invention is directed to the image brightness decline that amplitude reduction backlight causes under the dynamic backlight proposes a kind of simple, reliable dynamic backlight hypograph brightness automatic compensating method.
Image brightness automatic compensating method under the LCD TV dynamic backlight of the present invention may further comprise the steps:
Dynamic backlight desired value obtaining step reads the dynamic backlight desired value of dynamic backlight module output;
Contrast compensation maximum obtaining step, adjust custom menu contrast and contrast user value mapping relationship f so that the custom menu contrast when being a corresponding contrast user be worth A can and only can to satisfy image brightness that image that GTG is the n rank and GTG be n-1 identical or can and only can to satisfy the image brightness that image that GTG is the n rank, image that GTG is the n-1 rank and GTG be n-2 identical; Described n is the image gray-scale level peak, and described a is greater than custom menu contrast maximum * 1/2, and it is described contrast compensation maximum that described contrast user is worth A;
Contrast user is worth obtaining step, active user's menu contrast is converted to the contrast user according to described mapping relationship f is worth B;
Compensation way is selected step, if desired value backlight is then directly used the contrast user to be worth B and refreshed contrast register more than or equal to the compensation upper limit; If desired value backlight is then carried out the contrast compensation step less than the compensation upper limit;
The contrast compensation step comprises contrast compensation median calculation procedure and contrast compensation end value compensation process;
Wherein, contrast compensation median calculation procedure comprises: if desired value backlight less than the compensation upper limit and more than or equal to the compensation lower limit, then the value of compensating dynamic calculation step obtains the contrast compensation median; If desired value backlight is then spent the compensation median with the contrast compensation maximum as a comparison less than the compensation lower limit;
Described offset dynamic calculation step comprises: according to formula
Contrast compensation end value compensation process comprises: if active user's menu contrast more than or equal to a, is then used described contrast user to be worth B and refreshed contrast register; If active user's menu contrast less than a and more than or equal to custom menu contrast maximum * 1/2, is then used described contrast compensation median to spend as a comparison the compensation end value image brightness is compensated; If active user's menu contrast is less than custom menu contrast maximum * 1/2, obtains the contrast compensation end value after then described contrast compensation median and attenuation coefficient being multiplied each other, and use described contrast compensation end value that image brightness is compensated; Described attenuation coefficient is more than or equal to 0 and less than 1; A is greater than custom menu contrast maximum * 1/2.
Preferably, in described contrast compensation end value compensation process, if active user's menu contrast is less than custom menu contrast maximum * 1/2, according to formula
Preferably, described a is the integer between 80 ~ 100, and described custom menu contrast maximum * 1/2 is 50, and described n is 16,20 or 32.
Preferably, be limited to 80% ~ 90% in the described compensation, be limited to 40% ~ 50% under the compensation.
The invention also discloses the image brightness autocompensation installation under a kind of LCD TV dynamic backlight, comprise with lower module:
Dynamic backlight desired value acquisition module is used for reading the dynamic backlight desired value of dynamic backlight module output;
Contrast compensation maximum acquisition module, be used for to adjust custom menu contrast and contrast user value mapping relationship f so that the custom menu contrast when being a corresponding contrast user be worth A can and only can to satisfy image brightness that image that GTG is the n rank and GTG be n-1 identical or can and only can to satisfy the image brightness that image that GTG is the n rank, image that GTG is the n-1 rank and GTG be n-2 identical; Described n is the image gray-scale level peak, and described a is greater than custom menu contrast maximum * 1/2, and it is described contrast compensation maximum that described contrast user is worth A;
Contrast user is worth acquisition module, is used for that active user's menu contrast is converted to the contrast user according to mapping relationship f and is worth B;
Compensation way is selected module, is used for directly using the contrast user to be worth B and refreshing contrast register when desired value backlight is more than or equal to the compensation upper limit; , then by the contrast compensation module image brightness is compensated less than the compensation upper limit in desired value backlight;
The contrast compensation module comprises contrast compensation median computing module and contrast compensation end value compensating module;
Wherein, contrast compensation median computing module is used in desired value backlight less than compensating the upper limit and more than or equal to when compensating lower limit, obtaining the contrast compensation median by offset dynamic calculation module; When desired value backlight is less than the compensation lower limit, will spend as a comparison the compensation median than degree compensation maximum;
Described offset dynamic calculation module is used for according to formula
Contrast compensation end value compensating module is used for using described contrast user to be worth B and refreshing contrast register when active user's menu contrast is more than or equal to a; , use described contrast compensation median to spend as a comparison the compensation end value image brightness is compensated less than a and more than or equal to custom menu contrast maximum * 1/2 o'clock in active user's menu contrast; , obtain the contrast compensation end value after described contrast compensation median and attenuation coefficient multiplied each other, and use described contrast compensation end value that image brightness is compensated less than custom menu contrast maximum * 1/2 o'clock in active user's menu contrast; Described attenuation coefficient is more than or equal to 0 and less than 1; A is greater than custom menu contrast maximum * 1/2.
Preferably, described contrast compensation end value compensating module is according to formula
Owing to adopted technique scheme, the present invention can reach such beneficial effect:
In image display process, when the brightness of backlight changes with image change, the present invention adopts real-time dynamic backlight amplitude as initial conditions, five sections curves of contrast according to the image quality debugging carry out the segmentation mapping, obtain the contrast compensation value, are written in real time contrast register, carry out the dimmed luminance compensation of image, promote perceived brightness, details, the level of image, reduce the energy consumption of liquid crystal display screen, guaranteed image effect.
Description of drawings
Examples of the present invention will be described by way of reference to the accompanying drawings, wherein:
Image brightness effect automatic Compensation Technology schematic diagram under Fig. 1 dynamic backlight.
Fig. 2 is a specific embodiment of the mapping relations of custom menu contrast and contrast user value.
Fig. 3 selects the compensation way schematic diagram according to the dynamic backlight desired value.
Fig. 4 contrast compensation median concerns schematic diagram in conjunction with the custom menu contrast to the conversion coefficient of contrast compensation end value.
Embodiment
Disclosed all features in this specification, or the step in disclosed all methods or the process except mutually exclusive feature and/or step, all can make up by any way.
Disclosed arbitrary feature in this specification (comprising any accessory claim, summary and accompanying drawing) is unless special narration all can be replaced by other equivalences or the alternative features with similar purpose.That is, unless special narration, each feature is an example in a series of equivalences or the similar characteristics.
The principle of the image brightness automatic compensating method under the LCD TV dynamic backlight may further comprise the steps as shown in Figure 1:
Dynamic backlight desired value obtaining step reads the dynamic backlight desired value of dynamic backlight module output;
Contrast compensation maximum obtaining step, adjust custom menu contrast and contrast user value mapping relationship f so that the custom menu contrast when being a corresponding contrast user be worth A can and only can to satisfy image brightness that image that GTG is the n rank and GTG be n-1 identical or can and only can to satisfy the image brightness that image that GTG is the n rank, image that GTG is the n-1 rank and GTG be n-2 identical; Described n is the image gray-scale level peak, and described a is greater than custom menu contrast maximum * 1/2, and it is described contrast compensation maximum that described contrast user is worth A;
Contrast user is worth obtaining step, active user's menu contrast is converted to the contrast user according to described mapping relationship f is worth B;
Compensation way is selected step, if desired value backlight is then directly used the contrast user to be worth B and refreshed contrast register, and do not need image brightness is compensated more than or equal to the compensation upper limit; If desired value backlight is then carried out the contrast compensation step less than the compensation upper limit;
The contrast compensation step comprises contrast compensation median calculation procedure and contrast compensation end value compensation process;
Wherein, contrast compensation median calculation procedure comprises: if desired value backlight less than the compensation upper limit and more than or equal to the compensation lower limit, then the value of compensating dynamic calculation step obtains the contrast compensation median; If desired value backlight is then spent the compensation median with the contrast compensation maximum as a comparison less than the compensation lower limit;
Described offset dynamic calculation step comprises: according to formula
The compensation of Calculation Comparison degree median, wherein CON(temp) be the contrast compensation median, CON(a) be the contrast compensation maximum, CON(usr) for the contrast user is worth B, thH is the compensation upper limit, and thL is the compensation lower limit, and PWM DUTY is desired value backlight;
Contrast compensation end value compensation process comprises: if active user's menu contrast more than or equal to a, is then used described contrast user to be worth B and refreshed contrast register, also do not need image brightness is compensated; If active user's menu contrast less than a and more than or equal to custom menu contrast maximum * 1/2, is then used described contrast compensation median to spend as a comparison the compensation end value image brightness is compensated; If active user's menu contrast is less than custom menu contrast maximum * 1/2, obtains the contrast compensation end value after then described contrast compensation median and attenuation coefficient being multiplied each other, and use described contrast compensation end value that image brightness is compensated; Described attenuation coefficient is more than or equal to 0 and less than 1; A is greater than custom menu contrast maximum * 1/2.
Now each step is described respectively:
Dynamic backlight desired value obtaining step: after the dynamic backlight module starts just according to real-time image content, calculate desired value backlight (PWM DUTY), then (adopting filtering at this is this area dynamic backlight technological means commonly used through time filtering in described desired value backlight, purpose is to suppress to disturb, prevent the drastic change that causes dynamic backlight desired value, contrast compensation value because of the image content saltus step, and then cause the problem of picture flicker backlight, brightness flicker) after when outputing to the brightness of LCDs control back of the body lamp and change, with desired value output backlight.The concrete steps that the dynamic backlight module is calculated desired value backlight are: obtain present image and it is temporarily stored in the memory, utilize luminance equation Gray=0.3 * R+0.59 * G+0.11 * B to obtain the gray value of each pixel, then add up the number of pixels of every kind of gray scale, calculate the average gray of whole two field picture according to the pixel quantity of gray value and this gray value, for example the mean value calculation formula is
Then determine pwm value or the duty ratio of adjusting pwm signal backlight according to gradation of image mean value, the duty ratio of described adjusting pwm signal backlight is the gray scale desired value among the present invention, see the 3rd ~ 4 page of patent 201010300512.1 bulletin textual description book for details, be not described in detail in this detailed process and the principle of dynamic backlight technology.
Contrast compensation maximum obtaining step: adjust custom menu contrast and contrast user value mapping relationship f so that the custom menu contrast when being a corresponding contrast user be worth A can and only can to satisfy image brightness that image that GTG is the n rank and GTG be n-1 identical or can and only can to satisfy the image brightness that image that GTG is the n rank, image that GTG is the n-1 rank and GTG be n-2 identical; It is described contrast compensation maximum that described contrast user is worth A.Described n is the image gray-scale level peak, and the image brightness tolerance that those skilled in the art commonly use is 16,20 GTGs or 32 GTGs.Described a is greater than custom menu contrast maximum * 1/2, and on the manipulable TV menu of user, the contrast excursion generally is 0-100, thereby custom menu contrast maximum described here * 1/2 is generally 50.
Described a is the integer between 80 ~ 100, can be 90 in a specific embodiment.
The contrast excursion generally is 0 ~ 100 on the manipulable TV menu of user, and be 0 ~ 255 in the excursion of the contrast register of television set master chip internal control NTSC television system NTSC machine picture contrast, thereby those skilled in the art need to be worth itself and contrast user interrelated according to certain mapping relations the custom menu contrast.Custom menu contrast in this area and contrast user are worth mapping relations to be had multiple.Clearer for what technical scheme of the present invention was set forth, the mapping relations of summary custom menu contrast and contrast user value as an example of five sections curves of contrast example still should not be interpreted as five sections curves of contrast the restriction of the mapping relations of custom menu contrast and contrast user value among the present invention.
Five sections curves of contrast, namely by (0, CON (0)), (25, CON (25)), (50, CON (50)), (75, CON (75)), (100, CON (100)) five broken lines that point is formed by connecting, con(x) value in the contrast register that representative of consumer menu contrast x is corresponding also is contrast user value.When the custom menu value changed by 0 to 100, the contrast register value was changed to CON (100) by CON (0), and Fig. 2 shows an instantiation of five sections curves of contrast.Owing to be subjected to chip characteristics and display screen properties influence, it not is to be linear that the variation of luminance level and contrast register change, if do not limit contrast register excursion corresponding to custom menu contrast, black cut-off and bright saturated (the highlighted GTG of part can not be differentiated) will appear respectively.Such as: when the contrast register value reached 32, image had namely reached complete black effect, and when the contrast register value reached 208, brightness all can be saturated at the GTG more than 50%.So need to carry out five sections curve debugging, the lifting and the CON (100) that carry out CON (0) reduce, when avoiding custom menu to adjust, black cut-off, bright saturated appears in image brightness level too early, the value of CON (25), CON (50), CON (75) is then adjusted according to the characteristic of each chip solution and the demand of image quality standard respectively, guarantees that the image brightness level changes continuously, nature.
Described contrast compensation maximum can be determined by five sections parameters of curve of described contrast.For example, when contrast is debugged, limiting the custom menu contrast is 90 o'clock, by regulating 75,100 corresponding value con(75 in five sections parameters of curve of described contrast), con(100), making described custom menu contrast is 90 o'clock, high two rank of 20 rank GTGs are just inseparable, when that is to say with 20 degree shade of gray spirogram image brightness, the custom menu contrast 90 corresponding contrast users when making the image brightness that just makes 19 rank gray scales identical with 20 rank gray level image brightness are worth con(90) as described contrast compensation maximum.
Contrast user is worth obtaining step: active user's menu contrast is converted to the contrast user according to the mapping relationship f of aforementioned contrast compensation maximum obtaining step is worth B.
Compensation way is selected step: if desired value backlight is then directly used the contrast user to be worth B and refreshed contrast register more than or equal to the compensation upper limit, do not do compensation; If desired value backlight is then carried out the contrast compensation step less than the compensation upper limit;
The contrast compensation step comprises contrast compensation median calculation procedure and contrast compensation end value compensation process;
Wherein, contrast compensation median calculation procedure comprises: if desired value backlight less than the compensation upper limit and more than or equal to the compensation lower limit, then the value of compensating dynamic calculation step obtains the contrast compensation median; If desired value backlight is then spent the compensation median with the contrast compensation maximum as a comparison less than the compensation lower limit;
Described offset dynamic calculation step comprises: according to formula
The compensation of Calculation Comparison degree median, wherein CON(temp) be the contrast compensation median, CON(a) be the contrast compensation maximum, CON(usr) for the contrast user is worth B, thH is the compensation upper limit, and thL is the compensation lower limit, and PWM DUTY is desired value backlight.
Described compensation upper range is 80% ~ 90%, and the compensation lower range is 40% ~ 50%.But compensation upper range, compensation lower range should be interpreted as restriction of the present invention.
In a specific embodiment, be limited to 80% in the compensation, be limited to 50% under the compensation, concrete contrast compensation median is calculated as follows:
Contrast compensation end value compensation process comprises: if active user's menu contrast more than or equal to a, is then used described contrast user to be worth B and refreshed contrast register, also do not need image brightness is compensated; If active user's menu contrast less than a and more than or equal to custom menu contrast maximum * 1/2, is then used described contrast compensation median to spend as a comparison the compensation end value image brightness is compensated; If active user's menu contrast is less than custom menu contrast maximum * 1/2, obtains the contrast compensation end value after then described contrast compensation median and attenuation coefficient being multiplied each other, and use described contrast compensation end value that image brightness is compensated; Described attenuation coefficient is more than or equal to 0 and less than 1; A is greater than custom menu contrast maximum * 1/2.
This is because image is tentatively compensated, namely obtain the contrast compensation median after, also to consider the value of contrast on the custom menu.If the user is set to very little value to the contrast on the menu, algorithm still compensates with the contrast compensation maximum, and it is brighter that image will seem, is difficult to guarantee that the user adjusts the intention of contrast.Therefore after when the user is set to very little value to the contrast on the menu, the contrast compensation median need to being changed, obtain final contrast compensation value (CON (final)).Briefly, obtain exactly the contrast compensation median after, according to contrast on the custom menu be worth the contrast compensation end value, use described contrast compensation end value that image brightness is compensated.
Contrast compensation end value compensation process as follows:
As one preferred embodiment, as half〉during usr 〉=0, decay according to following formula contrast compensation median:
The present invention is not limited to aforesaid embodiment.The present invention expands to any new feature or any new combination that discloses in this manual, and the arbitrary new method that discloses or step or any new combination of process.
Claims (8)
1. the image brightness automatic compensating method under the LCD TV dynamic backlight is characterized in that, may further comprise the steps:
Dynamic backlight desired value obtaining step reads the dynamic backlight desired value of dynamic backlight module output;
Contrast compensation maximum obtaining step, adjust custom menu contrast and contrast user value mapping relationship f so that the custom menu contrast when being a corresponding contrast user be worth A can and only can to satisfy image brightness that image that GTG is the n rank and GTG be n-1 identical or can and only can to satisfy the image brightness that image that GTG is the n rank, image that GTG is the n-1 rank and GTG be n-2 identical; Described n is the image gray-scale level peak, and described a is greater than custom menu contrast maximum * 1/2, and it is described contrast compensation maximum that described contrast user is worth A;
Contrast user is worth obtaining step, active user's menu contrast is converted to the contrast user according to described mapping relationship f is worth B;
Compensation way is selected step, if desired value backlight is then directly used the contrast user to be worth B and refreshed contrast register more than or equal to the compensation upper limit; If desired value backlight is then carried out the contrast compensation step less than the compensation upper limit;
The contrast compensation step comprises contrast compensation median calculation procedure and contrast compensation end value compensation process;
Wherein, contrast compensation median calculation procedure comprises: if desired value backlight less than the compensation upper limit and more than or equal to the compensation lower limit, then the value of compensating dynamic calculation step obtains the contrast compensation median; If desired value backlight is then spent the compensation median with the contrast compensation maximum as a comparison less than the compensation lower limit;
Described offset dynamic calculation step comprises: according to formula
Contrast compensation end value compensation process comprises: if active user's menu contrast more than or equal to a, is then used described contrast user to be worth B and refreshed contrast register; If active user's menu contrast less than a and more than or equal to custom menu contrast maximum * 1/2, is then used described contrast compensation median to spend as a comparison the compensation end value image brightness is compensated; If active user's menu contrast is less than custom menu contrast maximum * 1/2, obtains the contrast compensation end value after then described contrast compensation median and attenuation coefficient being multiplied each other, and use described contrast compensation end value that image brightness is compensated; Described attenuation coefficient is more than or equal to 0 and less than 1; A is greater than custom menu contrast maximum * 1/2.
2. the image brightness automatic compensating method under a kind of LCD TV dynamic backlight according to claim 1, it is characterized in that, in described contrast compensation end value compensation process, if active user's menu contrast is less than custom menu contrast maximum * 1/2, according to formula
3. the image brightness automatic compensating method under a kind of LCD TV dynamic backlight according to claim 1 is characterized in that described a is the integer between 80 ~ 100, and described custom menu contrast maximum * 1/2 is 50, and described n is 16,20 or 32.
4. the image brightness automatic compensating method under a kind of LCD TV dynamic backlight according to claim 1 is characterized in that, is limited to 80% ~ 90% in the described compensation, is limited to 40% ~ 50% under the compensation.
5. the image brightness autocompensation installation under the LCD TV dynamic backlight is characterized in that, comprises with lower module:
Dynamic backlight desired value acquisition module is used for reading the dynamic backlight desired value of dynamic backlight module output;
Contrast compensation maximum acquisition module, be used for to adjust custom menu contrast and contrast user value mapping relationship f so that the custom menu contrast when being a corresponding contrast user be worth A can and only can to satisfy image brightness that image that GTG is the n rank and GTG be n-1 identical or can and only can to satisfy the image brightness that image that GTG is the n rank, image that GTG is the n-1 rank and GTG be n-2 identical; Described n is the image gray-scale level peak, and described a is greater than custom menu contrast maximum * 1/2, and it is described contrast compensation maximum that described contrast user is worth A;
Contrast user is worth acquisition module, is used for that active user's menu contrast is converted to the contrast user according to mapping relationship f and is worth B;
Compensation way is selected module, is used for directly using the contrast user to be worth B and refreshing contrast register when desired value backlight is more than or equal to the compensation upper limit; , then by the contrast compensation module image brightness is compensated less than the compensation upper limit in desired value backlight;
The contrast compensation module comprises contrast compensation median computing module and contrast compensation end value compensating module;
Wherein, contrast compensation median computing module is used in desired value backlight less than compensating the upper limit and more than or equal to when compensating lower limit, obtaining the contrast compensation median by offset dynamic calculation module; When desired value backlight is less than the compensation lower limit, will spend as a comparison the compensation median than degree compensation maximum;
Described offset dynamic calculation module is used for according to formula
The compensation of Calculation Comparison degree median, wherein CON(temp) be the contrast compensation median, CON(a) be the contrast compensation maximum, CON(usr) for the contrast user is worth B, thH is the compensation upper limit, and thL is the compensation lower limit, and PWM DUTY is desired value backlight;
Contrast compensation end value compensating module is used for using described contrast user to be worth B and refreshing contrast register when active user's menu contrast is more than or equal to a; , use described contrast compensation median to spend as a comparison the compensation end value image brightness is compensated less than a and more than or equal to custom menu contrast maximum * 1/2 o'clock in active user's menu contrast; , obtain the contrast compensation end value after described contrast compensation median and attenuation coefficient multiplied each other, and use described contrast compensation end value that image brightness is compensated less than custom menu contrast maximum * 1/2 o'clock in active user's menu contrast; Described attenuation coefficient is more than or equal to 0 and less than 1; A is greater than custom menu contrast maximum * 1/2.
6. the image brightness autocompensation installation under a kind of LCD TV dynamic backlight according to claim 5 is characterized in that, described contrast compensation end value compensating module is according to formula
Described contrast compensation median is decayed, con(final) be the contrast compensation end value, CON(usr) be worth B for the contrast user, con(half) being contrast user's value of custom menu contrast maximum * 1/2 correspondence, con(0) is contrast user's value of custom menu contrast 0 correspondence.
7. the image brightness autocompensation installation under a kind of LCD TV dynamic backlight according to claim 5 is characterized in that described a is the integer between 80 ~ 100, and described custom menu contrast maximum * 1/2 is 50, and described n is 16,20 or 32.
8. the image brightness autocompensation installation under a kind of LCD TV dynamic backlight according to claim 5 is characterized in that, is limited to 80% ~ 90% in the described compensation, is limited to 40% ~ 50% under the compensation.
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