CN103024320B - Image brightness automatic compensating method under a kind of liquid crystal television dynamic backlight and device - Google Patents
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Abstract
The invention discloses the image brightness automatic compensating method under a kind of liquid crystal television dynamic backlight and device, relate to liquid crystal television dynamic backlight and image brightness adjustment technology, the problem being intended to reduce for backlight amplitude under dynamic backlight the image brightness decline caused proposes a kind of simple, reliable dynamic backlight hypograph brightness automatic compensating method and device.The inventive method mainly comprises the following steps: dynamic backlight desired value obtaining step, reads the dynamic backlight desired value that dynamic backlight module exports; Contrast compensation maximum obtaining step; Contrast user is worth obtaining step, active user's menu contrast is converted to contrast user according to described mapping relationship f and is worth B; Compensation way selects step, if backlight desired value is less than the compensation upper limit, then performs contrast compensation step; Contrast compensation step, comprises contrast compensation middle-value calculating step and contrast compensation end value compensation process etc.
Description
Technical field
The present invention relates to liquid crystal television dynamic backlight and image brightness adjustment technology, particularly LCD TV causes image brightness automatic compensating method in image brightness decline situation and device because adopting dynamic backlight.
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 carry out backlight calculating and control according to dynamic picture material, when the constant backlight brightness of the most high-amplitude of unnecessary maintenance, turn down backlight illumination suitably.Such as domestic mandate patent of invention 201010300512.1 discloses a kind of dynamic backlight technology, its key step is: obtain present image and be temporarily stored in memory, luminance equation Gray=0.3 × R+0.59 × G+0.11 × B is utilized to obtain the gray value of each pixel, then the number of pixels of often kind of gray scale is added up, the average gray of whole two field picture is calculated according to gray value and the pixel quantity of this gray value
, then regulate pwm value or the duty ratio (referring to this patent announcement textual description book 3rd ~ 4 pages) of pwm signal according to gradation of image mean value determination backlight, in addition, domestic patent application 201010128036.X also discloses a kind of backlight regulation technology.
With keep the constant backlight brightness of most high-amplitude to compare, after dynamically reducing backlight, visually can feel that image brightness declines, image level reduces, some unborn details and the depth of field are all affected, and that is image quality decrease, easily causes visual fatigue.In the case, the solution that user is general closes dynamic backlight, so just lost the original intention that dynamic backlight reduces energy consumption; Or manually image brightness, contrast are increased, details in a play not acted out on stage, but told through dialogues can be changed to bright field like this, but when playing bright picture, just there will be blocking of the highlighted value part of picture, need again image brightness, contrast to be lowered, this mode is for too loaded down with trivial details user and inconvenient again.
In order to overcome these problems, many compensation techniques be proposed for backlight dim after image brightness compensate, wherein comprise methods such as improving LCD light transmittance, the growth of LCD linearly amplitude, GAMMA data correction.In said method, part measure is fairly simple, and easily cause the problem such as to block that colour temperature changes, contour, picture high luminance values appear in image, it is comparatively complicated that part measure exists computing, and embody rule has difficulties.
Summary of the invention
The backlight amplitude under dynamic backlight that the present invention is directed to reduces problem that the image brightness that causes declines and proposes a kind of simple, dynamic backlight hypograph brightness automatic compensating method reliably.
Image brightness automatic compensating method under liquid crystal television dynamic backlight of the present invention, comprises the following steps:
Dynamic backlight desired value obtaining step, reads the dynamic backlight desired value that dynamic backlight module exports;
Contrast compensation maximum obtaining step, when adjustment custom menu contrast makes custom menu contrast be a with the mapping relationship f of contrast user value corresponding contrast user be worth A can and only can meet image that GTG is n rank and GTG be the image brightness of n-1 identical or can and only can meet image that GTG is n rank, image brightness that image that GTG is n-1 rank and GTG are n-2 is identical; Described n is 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 contrast user according to described mapping relationship f and is worth B;
Compensation way selects step, if backlight desired value is more than or equal to the compensation upper limit, then directly uses contrast user to be worth B and refreshes contrast register; If backlight desired value is less than the compensation upper limit, then perform contrast compensation step;
Contrast compensation step, comprises contrast compensation middle-value calculating step and contrast compensation end value compensation process;
Wherein, contrast compensation middle-value calculating step comprises: compensate the upper limit if backlight desired value is less than and is more than or equal to compensation lower limit, then compensating value dynamic calculating step and obtain contrast compensation median; If backlight desired value is less than compensation lower limit, then contrast compensation maximum is spent compensation median as a comparison;
Described offset dynamic calculating step comprises: according to formula
calculate contrast compensation median, wherein CON(temp) be contrast compensation median, CON(a) be contrast compensation maximum, CON(usr) for contrast user is worth B, thH is for compensating the upper limit, and thL is for compensating lower limit, and PWM DUTY is backlight desired value;
Contrast compensation end value compensation process comprises: if active user's menu contrast is more than or equal to a, then use described contrast user to be worth B and refresh contrast register; If active user's menu contrast is less than a and be more than or equal to custom menu contrast maximum × 1/2, then uses described contrast compensation median to spend compensation end value as a comparison and image brightness is compensated; If active user's menu contrast is less than custom menu contrast maximum × 1/2, then obtain contrast compensation end value after described contrast compensation median being multiplied with attenuation coefficient, and the contrast compensation end value described in using compensates to image brightness; Described attenuation coefficient is more than or equal to 0 and is 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
decay to stating contrast compensation median, con(final) be contrast compensation end value, CON(usr) for contrast user is worth B, con(half) for the contrast user of custom menu contrast maximum × 1/2 correspondence is worth, con(0) be worth for the contrast user of custom menu contrast 0 correspondence.
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, the described compensation upper limit is 80% ~ 90%, and compensating lower limit is 40% ~ 50%.
The invention also discloses the image brightness autocompensation installation under a kind of liquid crystal television dynamic backlight, comprise with lower module:
Dynamic backlight desired value acquisition module, for reading the dynamic backlight desired value that dynamic backlight module exports;
Contrast compensation maximum acquisition module, for adjust corresponding contrast user when custom menu contrast makes custom menu contrast be a with the mapping relationship f of contrast user value be worth A can and only can meet image that GTG is n rank and GTG be the image brightness of n-1 identical or can and only can meet image that GTG is n rank, image brightness that image that GTG is n-1 rank and GTG are n-2 is identical; Described n is 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 worth B for active user's menu contrast is converted to contrast user according to mapping relationship f;
Compensation way selects module, for be more than or equal to the compensation upper limit in backlight desired value in, directly use contrast user to be worth B and refreshes contrast register; Be less than the compensation upper limit in backlight desired value, then by contrast compensation module, image brightness compensated;
Contrast compensation module, comprises contrast compensation middle-value calculating module and contrast compensation end value compensating module;
Wherein, contrast compensation middle-value calculating module, compensating when lower limit for being less than in backlight desired value to compensate the upper limit and be more than or equal to, obtaining contrast compensation median by offset dynamic calculation module; When backlight desired value is less than compensation lower limit, maximum will be compensated than degree and spend compensation median as a comparison;
Described offset dynamic calculation module, for according to formula
calculate contrast compensation median, wherein CON(temp) be contrast compensation median, CON(a) be contrast compensation maximum, CON(usr) for contrast user is worth B, thH is for compensating the upper limit, and thL is for compensating lower limit, and PWM DUTY is backlight desired value;
Contrast compensation end value compensating module, in being more than or equal to a in active user's menu contrast, using described contrast user to be worth B and refreshes contrast register; When active user's menu contrast is less than a and is more than or equal to custom menu contrast maximum × 1/2, use described contrast compensation median to spend compensation end value as a comparison and image brightness is compensated; When active user's menu contrast is less than custom menu contrast maximum × 1/2, after described contrast compensation median being multiplied with attenuation coefficient, obtain contrast compensation end value, and the contrast compensation end value described in using compensates to image brightness; Described attenuation coefficient is more than or equal to 0 and is 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
described contrast compensation median is decayed, con(final) be contrast compensation end value, CON(usr) for contrast user is worth B, con(half) for the contrast user of custom menu contrast maximum × 1/2 correspondence is worth, con(0) be worth for the contrast user of custom menu contrast 0 correspondence.
Owing to have employed 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, contrast five sections of curves according to image quality debugging carry out subsection compression, obtain contrast compensation value, are written to contrast register in real time, carry out the luminance compensation that image is dimmed, promote perceived brightness, details, the level of image, reduce the energy consumption of liquid crystal display screen, ensure that image effect.
Accompanying drawing explanation
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 compensation way schematic diagram according to dynamic backlight desired value.
Fig. 4 contrast compensation median is in conjunction with the conversion coefficient relation schematic diagram of custom menu contrast to contrast compensation end value.
Embodiment
All features disclosed in this specification, or the step in disclosed all methods or process, except mutually exclusive feature and/or step, all can combine by any way.
Arbitrary feature disclosed in this specification (comprising any accessory claim, summary and accompanying drawing), unless specifically stated otherwise, all can be replaced by other equivalences or the alternative features with similar object.That is, unless specifically stated otherwise, each feature is an example in a series of equivalence or similar characteristics.
The principle of the image brightness automatic compensating method under liquid crystal television dynamic backlight as shown in Figure 1, comprises the following steps:
Dynamic backlight desired value obtaining step, reads the dynamic backlight desired value that dynamic backlight module exports;
Contrast compensation maximum obtaining step, when adjustment custom menu contrast makes custom menu contrast be a with the mapping relationship f of contrast user value corresponding contrast user be worth A can and only can meet image that GTG is n rank and GTG be the image brightness of n-1 identical or can and only can meet image that GTG is n rank, image brightness that image that GTG is n-1 rank and GTG are n-2 is identical; Described n is 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 contrast user according to described mapping relationship f and is worth B;
Compensation way selects step, if backlight desired value is more than or equal to the compensation upper limit, then directly uses contrast user to be worth B and refreshes contrast register, and do not need to compensate image brightness; If backlight desired value is less than the compensation upper limit, then perform contrast compensation step;
Contrast compensation step, comprises contrast compensation middle-value calculating step and contrast compensation end value compensation process;
Wherein, contrast compensation middle-value calculating step comprises: compensate the upper limit if backlight desired value is less than and is more than or equal to compensation lower limit, then compensating value dynamic calculating step and obtain contrast compensation median; If backlight desired value is less than compensation lower limit, then contrast compensation maximum is spent compensation median as a comparison;
Described offset dynamic calculating step comprises: according to formula
calculate contrast compensation median, wherein CON(temp) be contrast compensation median, CON(a) be contrast compensation maximum, CON(usr) for contrast user is worth B, thH is for compensating the upper limit, and thL is for compensating lower limit, and PWM DUTY is backlight desired value;
Contrast compensation end value compensation process comprises: if active user's menu contrast is more than or equal to a, then use described contrast user to be worth B and refresh contrast register, also do not need to compensate image brightness; If active user's menu contrast is less than a and be more than or equal to custom menu contrast maximum × 1/2, then uses described contrast compensation median to spend compensation end value as a comparison and image brightness is compensated; If active user's menu contrast is less than custom menu contrast maximum × 1/2, then obtain contrast compensation end value after described contrast compensation median being multiplied with attenuation coefficient, and the contrast compensation end value described in using compensates to image brightness; Described attenuation coefficient is more than or equal to 0 and is 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: just according to real-time image content after dynamic backlight module starts, calculate backlight desired value (PWM DUTY), then (filtering is adopted to be the dynamic backlight technological means that this area is commonly used at this in described backlight desired value through time filtering, object suppresses interference, prevent the drastic change causing dynamic backlight desired value, contrast compensation value because of image content saltus step, and then cause the problem of picture backlight flicker, brightness flicker) after output to while LCDs controls back of the body lamp brightness change, backlight desired value is exported.The concrete steps that dynamic backlight module calculates backlight desired value are: obtain present image and be temporarily stored in memory, luminance equation Gray=0.3 × R+0.59 × G+0.11 × B is utilized to obtain the gray value of each pixel, then the number of pixels of often kind of gray scale is added up, calculate the average gray of whole two field picture according to gray value and the pixel quantity of this gray value, such as mean value calculation formula is
then pwm value or the duty ratio of pwm signal is regulated according to gradation of image mean value determination backlight, the duty ratio of described backlight adjustment pwm signal is the gray scale desired value in the present invention, refer to patent 201010300512.1 and announce textual description book 3rd ~ 4 pages, be not described in detail in this detailed process and the principle of dynamic backlight technology.
Contrast compensation maximum obtaining step: when adjustment custom menu contrast makes custom menu contrast be a with the mapping relationship f of contrast user value corresponding contrast user be worth A can and only can meet image that GTG is n rank and GTG be the image brightness of n-1 identical or can and only can meet image that GTG is n rank, image brightness that image that GTG is n-1 rank and GTG are n-2 is identical; It is described contrast compensation maximum that described contrast user is worth A.Described n is 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, contrast excursion is generally 0-100, and custom menu contrast maximum × 1/2 thus described here is generally 50.
Described a is the integer between 80 ~ 100, can be 90 in a specific embodiment.
On the manipulable TV menu of user, contrast excursion is generally 0 ~ 100, 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, thus those skilled in the art need custom menu contrast to be worth interrelated according to certain mapping relations by itself and contrast user.Custom menu contrast in this area and contrast user are worth mapping relations to be had multiple.In order to technical scheme of the present invention is set forth clearly, for the mapping relations that contrast five sections of curve summary custom menu contrasts and contrast user are worth, but contrast five sections of curves should be interpreted as the restriction of the mapping relations of custom menu contrast and contrast user value in the present invention.
Contrast five sections of curves, 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 namely contrast user is worth.When custom menu value is by 0 to 100 change, contrast register value is changed by CON (0) to CON (100), and Fig. 2 shows an instantiation of contrast five sections of curves.Owing to being subject to chip characteristics and display screen properties influence, the change of luminance level and contrast register change are not linear, if do not limit the contrast register excursion that custom menu contrast is corresponding, black cut-off and bright saturated (the highlighted GTG of part can not be differentiated) will be there is respectively.Such as: time contrast register value reaches 32, namely image has reached entirely black effect, and time contrast register value reaches 208, the GTG of brightness more than 50% all can be saturated.So need to carry out five sections of curve debugging, the lifting and the CON (100) that carry out CON (0) reduce, when adjusting to avoid custom menu, there is black cut-off, bright saturated too early in image brightness level, the value of CON (25), CON (50), CON (75) then adjusts according to the characteristic of each chip solution and the demand of image quality standard respectively, ensures that image brightness layer variability is continuous, nature.
Described contrast compensation maximum, can be determined by described contrast five sections of parameters of curve.Such as, when contrast is debugged, when restriction custom menu contrast is 90, by regulating the value con(75 corresponding to 75,100 in described contrast five sections of parameters of curve), con(100), when making described custom menu contrast be 90, high two rank of 20 rank GTGs are just inseparable, that is, time with 20 degree of shade of gray spirogram image brightness, contrast user corresponding for the custom menu contrast 90 made when just making the image brightness of 19 rank gray scales identical with 20 rank gray level image brightness is worth con(90) as described contrast compensation maximum.
Contrast user is worth obtaining step: active user's menu contrast is converted to contrast user according to the mapping relationship f that aforementioned contrast compensates maximum obtaining step and is worth B.
Compensation way selects step: if backlight desired value is more than or equal to the compensation upper limit, then directly use contrast user to be worth B and refresh contrast register, do not compensate; If backlight desired value is less than the compensation upper limit, then perform contrast compensation step;
Contrast compensation step, comprises contrast compensation middle-value calculating step and contrast compensation end value compensation process;
Wherein, contrast compensation middle-value calculating step comprises: compensate the upper limit if backlight desired value is less than and is more than or equal to compensation lower limit, then compensating value dynamic calculating step and obtain contrast compensation median; If backlight desired value is less than compensation lower limit, then contrast compensation maximum is spent compensation median as a comparison;
Described offset dynamic calculating step comprises: according to formula
calculate contrast compensation median, wherein CON(temp) be contrast compensation median, CON(a) be contrast compensation maximum, CON(usr) for contrast user is worth B, thH is for compensating the upper limit, and thL is for compensating lower limit, and PWM DUTY is backlight desired value.
Described compensation upper range is 80% ~ 90%, and compensating 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, compensating the upper limit is 80%, and compensating lower limit is 50%, and concrete contrast compensation middle-value calculating is as follows:
, wherein, CON(temp) be contrast compensation median, PWM DUTY is backlight desired value, con(90) and as described contrast compensation maximum, as Fig. 3.
Contrast compensation end value compensation process comprises: if active user's menu contrast is more than or equal to a, then use described contrast user to be worth B and refresh contrast register, also do not need to compensate image brightness; If active user's menu contrast is less than a and be more than or equal to custom menu contrast maximum × 1/2, then uses described contrast compensation median to spend compensation end value as a comparison and image brightness is compensated; If active user's menu contrast is less than custom menu contrast maximum × 1/2, then obtain contrast compensation end value after described contrast compensation median being multiplied with attenuation coefficient, and the contrast compensation end value described in using compensates to image brightness; Described attenuation coefficient is more than or equal to 0 and is less than 1; A is greater than custom menu contrast maximum × 1/2.
This is because tentatively compensate image, after namely obtaining contrast compensation median, also to consider the value of contrast on custom menu.If user is set to very little value the contrast on menu, algorithm still compensates by contrast compensation maximum, and image will seem brighter, is difficult to ensure that user adjusts the intention of contrast.Therefore, need contrast compensation median to change when user is set to very little value the contrast on menu after, final contrast compensation value (CON (final)) is obtained.Briefly, after obtaining contrast compensation median exactly, according to contrast on custom menu worth go out contrast compensation end value, use described contrast compensation end value to compensate image brightness.
Contrast compensation end value compensation process as follows:
wherein, con(final) be the contrast compensation end value of write actual contrast register, con(temp) be contrast compensation median, α is attenuation coefficient, and half is custom menu contrast maximum × 1/2, usr is active user's menu contrast, when half>usr>=0, we think that user is set to very little value the contrast on menu, now need contrast compensation median to carry out decaying degree compensation end value as a comparison.As Fig. 4.
As one preferred embodiment, when half>usr >=0, contrast compensation median decays according to the following formula:
, CON(usr) and be worth B, con(half for contrast user) be the contrast user value of custom menu contrast maximum × 1/2 correspondence, con(0) be worth for the contrast user of custom menu contrast 0 correspondence.
The present invention is not limited to aforesaid embodiment.The present invention expands to any new feature of disclosing in this manual or any combination newly, and the step of the arbitrary new method disclosed or process or any combination newly.
Claims (8)
1. the image brightness automatic compensating method under liquid crystal television dynamic backlight, is characterized in that, comprise the following steps:
Dynamic backlight desired value obtaining step, reads the dynamic backlight desired value that dynamic backlight module exports;
Contrast compensation maximum obtaining step, adjustment custom menu contrast and the mapping relationship f that is worth of contrast user, contrast user corresponding when making custom menu contrast be a be worth A can and only can to meet GTG be image and the GTG on n rank be the image brightness of n-1 identical or can and only can meet image that GTG is n rank, image brightness that image that GTG is n-1 rank and GTG are n-2 is identical; Described n is 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 contrast user according to described mapping relationship f and is worth B;
Compensation way selects step, if backlight desired value is more than or equal to the compensation upper limit, then directly uses contrast user to be worth B and refreshes contrast register; If backlight desired value is less than the compensation upper limit, then perform contrast compensation step;
Contrast compensation step, comprises contrast compensation middle-value calculating step and contrast compensation end value compensation process;
Wherein, contrast compensation middle-value calculating step comprises: compensate the upper limit if backlight desired value is less than and is more than or equal to compensation lower limit, then compensating value dynamic calculating step and obtain contrast compensation median; If backlight desired value is less than compensation lower limit, then contrast compensation maximum is spent compensation median as a comparison;
Described offset dynamic calculating step comprises: according to formula
Calculate contrast compensation median, wherein CON (temp) is contrast compensation median, and CON (a) is contrast compensation maximum, CON (usr) is worth B for contrast user, thH is for compensating the upper limit, and thL is for compensating lower limit, and PWM DUTY is backlight desired value;
Contrast compensation end value compensation process comprises: if active user's menu contrast is more than or equal to a, then use described contrast user to be worth B and refresh contrast register; If active user's menu contrast is less than a and be more than or equal to custom menu contrast maximum × 1/2, then uses described contrast compensation median to spend compensation end value as a comparison and image brightness is compensated; If active user's menu contrast is less than custom menu contrast maximum × 1/2, then obtain contrast compensation end value after described contrast compensation median being multiplied with attenuation coefficient, and the contrast compensation end value described in using compensates to image brightness; Described attenuation coefficient is more than or equal to 0 and is less than 1; A is greater than custom menu contrast maximum × 1/2.
2. the image brightness automatic compensating method under a kind of liquid crystal television 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
Decay to stating contrast compensation median, con (final) is contrast compensation end value, CON (usr) is worth B for contrast user, the contrast user that con (half) is custom menu contrast maximum × 1/2 correspondence is worth, and the contrast user that con (0) is custom menu contrast 0 correspondence is worth.
3. the image brightness automatic compensating method under a kind of liquid crystal television 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 liquid crystal television dynamic backlight according to claim 1, is characterized in that, described compensation upper range is 80% ~ 90%, and compensating lower range is 40% ~ 50%.
5. the image brightness autocompensation installation under liquid crystal television dynamic backlight, is characterized in that, comprises with lower module:
Dynamic backlight desired value acquisition module, for reading the dynamic backlight desired value that dynamic backlight module exports;
Contrast compensation maximum acquisition module, for adjusting the mapping relationship f of custom menu contrast and contrast user value; Contrast user corresponding when making custom menu contrast be a be worth A can and only can to meet GTG be image and the GTG on n rank be the image brightness of n-1 identical or can and only can meet image that GTG is n rank, image brightness that image that GTG is n-1 rank and GTG are n-2 is identical; Described n is 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 worth B for active user's menu contrast is converted to contrast user according to mapping relationship f;
Compensation way selects module, for be more than or equal to the compensation upper limit in backlight desired value in, directly use contrast user to be worth B and refreshes contrast register; Be less than the compensation upper limit in backlight desired value, then by contrast compensation module, image brightness compensated;
Contrast compensation module, comprises contrast compensation middle-value calculating module and contrast compensation end value compensating module;
Wherein, contrast compensation middle-value calculating module, compensating when lower limit for being less than in backlight desired value to compensate the upper limit and be more than or equal to, obtaining contrast compensation median by offset dynamic calculation module; When backlight desired value is less than compensation lower limit, maximum will be compensated than degree and spend compensation median as a comparison;
Described offset dynamic calculation module, for according to formula
Calculate contrast compensation median, wherein CON (temp) is contrast compensation median, and CON (a) is contrast compensation maximum, CON (usr) is worth B for contrast user, thH is for compensating the upper limit, and thL is for compensating lower limit, and PWM DUTY is backlight desired value;
Contrast compensation end value compensating module, in being more than or equal to a in active user's menu contrast, using described contrast user to be worth B and refreshes contrast register; When active user's menu contrast is less than a and is more than or equal to custom menu contrast maximum × 1/2, use described contrast compensation median to spend compensation end value as a comparison and image brightness is compensated; When active user's menu contrast is less than custom menu contrast maximum × 1/2, after described contrast compensation median being multiplied with attenuation coefficient, obtain contrast compensation end value, and the contrast compensation end value described in using compensates to image brightness; Described attenuation coefficient is more than or equal to 0 and is less than 1; A is greater than custom menu contrast maximum × 1/2.
6. the image brightness autocompensation installation under a kind of liquid crystal television 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) is contrast compensation end value, CON (usr) is worth B for contrast user, the contrast user that con (half) is custom menu contrast maximum × 1/2 correspondence is worth, and the contrast user that con (0) is custom menu contrast 0 correspondence is worth.
7. the image brightness autocompensation installation under a kind of liquid crystal television 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 liquid crystal television dynamic backlight according to claim 5, is characterized in that, described compensation upper range is 80% ~ 90%, and compensating lower range is 40% ~ 50%.
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| CN105528994B (en) | 2016-02-22 | 2019-03-15 | 深圳市华星光电技术有限公司 | A kind of method and system reducing display panel power consumption |
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