CN102404440B - Method and device automatically adjusting backlight luminance - Google Patents
Method and device automatically adjusting backlight luminance Download PDFInfo
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- CN102404440B CN102404440B CN201010283812.3A CN201010283812A CN102404440B CN 102404440 B CN102404440 B CN 102404440B CN 201010283812 A CN201010283812 A CN 201010283812A CN 102404440 B CN102404440 B CN 102404440B
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
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Abstract
The invention discloses a method automatically adjusting backlight luminance and relates to the technical field of the embedded device screen backlight luminance adjustment. The method comprises the following steps: firstly, sampling the ambient light intensity and obtaining the sampling data; secondly, performing smoothing treatment to the sampling data; thirdly, in the light of the corresponding relationship between the light intensity and the sampling data, obtaining the corresponding present light intensity level in accordance with the sampling data; fourthly, in accordance with the corresponding relationship between the light intensity and the sampling data, determining the present backlight luminance; fifthly, adjusting the backlight luminance in accordance with the present backlight luminance. The invention further provides a device automatically adjusting backlight luminance. The invention is suitable for handheld embedded devices such as mobile phone, PDA, etc. The invention not only can raise the adjusting precision by increasing the automatic light adjusting levels, but also can improve the user experience and can reduce the power consumption. The screen will not flicker even under the continuous ambient light change.
Description
Technical field
The present invention relates to the screen backlight brightness regulation technical field of embedded device, relate in particular to a kind of method and device of automatic adjusting backlight luminance.
Background technology
At embedded handhold equipment, especially along with at home universal of mobile 3G technology, increasing 3G mobile is about to appear on the market, and 3G mobile is conventionally all furnished with the large-sized display screen of high brightness and supports abundant multi-medium data business, and these all bring great challenge to the flying power of mobile phone.Wherein display backlight power consumption is larger, if can automatically regulate display backlight according to user place light environment, so just can effectively reduce power consumption, improve battery flying power, good automatic adjusting backlight function can bring more comfortable visual experience to user simultaneously.But when carry out automatic backlight adjusting, regulate the setting of Intensity threshold backlight, seem particularly important.The setting of Intensity threshold is not only relevant with photo-sensitive cell, simultaneously relevant with user place light environment.If luminosity sampling value just in time fluctuates near Intensity threshold, will constantly automatically regulate backlightly, this not only can cause to dodge screen phenomenon and affect user experiences, and can increase power consumption.
Automatic backlight is controlled permission equipment and when light sensors arrives the variation of ambient light, is automatically regulated backlight.For example, under brighter light environment, can increase backlight intensity to keep readable, and under darker light environment, can weaken backlight intensity minimum to power consumption is down to.
In order to realize automatic adjusting backlight luminance, the scheme that prior art provides is, utilize a light-sensitive device (such as optical sensor or the integrated photodiode of cell-phone camera head module self) to obtain surround lighting light intensity data, by pre-set backlighting parameters table, come adjusting screen backlight.
The another kind of scheme of prior art is, user can arrange backlighting parameters according to demand, with the self-demand that meets of hommization more.
But this two schemes all faces same problem: light-sensitive device itself has certain error to the induction of light intensity, the light environment at user place also varies, the light intensity data sampling like this will fluctuate within the specific limits, if be fixedly installed automatic adjusting threshold value backlight, and sampled data just in time fluctuates at Near Threshold, will constantly regulate backlightly, cause and dodge screen phenomenon, thereby affect user's experience, increased power consumption.Along with increasing, automatically regulate progression backlight, occur that the probability of this sudden strain of a muscle screen phenomenon will increase.
Mainly there is following problem and shortage in current method:
Automatically regulate progression backlight less, although increase progression, can reduce power consumption, occur that the probability that dodges screen also can increase thereupon.
In the unsettled situation of light, may there is the frequent phenomenon backlight that regulates.
When the sampled value of light intensity fluctuates near automatically regulating Intensity threshold backlight, there will be and dodge screen phenomenon.
Summary of the invention
The technical problem that the present invention mainly solves is just to provide a kind of method and device of automatic adjusting backlight luminance, can effectively solve the sudden strain of a muscle screen phenomenon that may occur in automatic adjusting process backlight, increases and automatically regulates progression backlight, strengthens user and experiences, and reduces power consumption.
In order to solve the problems of the technologies described above, the invention provides a kind of following technical scheme:
A method for automatic adjusting backlight luminance, described method comprises the steps:
Step 1, the light intensity of current environment is sampled, obtain sampled data;
Step 2, sampled data is carried out to smoothing processing;
Step 3, according to the corresponding relation of light intensity grade and sampled data, according to sampled data, obtain corresponding current light intensity grade;
Step 4, according to the corresponding relation of light intensity grade and backlight illumination, determine current backlight brightness;
Step 5, according to above-mentioned current backlight brightness, carry out adjusting backlight luminance.
As the improvement of technique scheme, in step 2, adopt Weighted Average Algorithm to remove the fluctuation of sampled data, by calculating the correlation of current sampled data and a front N-1 sampled data, obtain the sampled data value Y of current output, Xi represents sampled data, ε
1, ε
2, ε
3... ε
nfor weight coefficient, and ε
1+ ε
2+ ε
3+ ...+ε
n=1:
As the improvement of technique scheme, the scope of sampled data is 0 to 255, and it is divided into different interval ranges, respectively corresponding different light intensity grades.
As the improvement of technique scheme, in step 4, first judge whether current luminosity sampling data fluctuate near Intensity threshold, if not, by the corresponding relation of light intensity grade and backlight illumination, determine current backlight brightness; If so, regulate Intensity threshold, then according to the corresponding relation of light intensity grade and backlight illumination, determine current backlight brightness.
Improvement as technique scheme, also further comprises the steps: in step 5
First judge that whether current backlight brightness is identical with previous backlight illumination, if not identical, carry out next step; If identical, backlight illumination is not regulated, return to step 1;
Whether judgement surpasses the adjusting number of times of backlight illumination within the time period of setting, if surpass the adjusting number of times of setting, backlight illumination is not regulated; If do not surpass the adjusting number of times of setting, backlight illumination regulated.
The present invention also provides a kind of device of automatic adjusting backlight luminance, and described device comprises central processing unit, and the optical sensor of being controlled by central processing unit, backlight controller, adjusting template backlight and internal memory.
As the improvement of technique scheme, the corresponding relation of light intensity grade and sampled data and the corresponding relation of light intensity grade and backlight illumination in internal memory, have been preserved.
As the improvement of technique scheme, adjustment module backlight comprises smoothing processing module, light intensity grade confirmation module, current backlight brightness selection module, backlight illumination comparison module and counter.
As the improvement of technique scheme, optical sensor light intensity to surrounding environment under the control of central processing unit is sampled, and obtains sampled data, and sends central processing unit to.
As the improvement of technique scheme, central processing unit is transferred light intensity grade and is confirmed module, by inquiring about the corresponding relation of light intensity grade and sampled data, obtains corresponding light intensity grade.
As the improvement of technique scheme, central processing unit is transferred current backlight brightness and is selected module, according to the corresponding relation of light intensity grade and backlight illumination, determines current backlight brightness.
Improvement as technique scheme, first central processing unit judged whether luminosity sampling data fluctuate near Intensity threshold before definite current backlight brightness, if while fluctuating near Intensity threshold, improve Intensity threshold, and then select current backlight brightness according to the Intensity threshold after improving.
As the improvement of technique scheme, central processing unit is transferred backlight illumination comparison module, judges that whether current backlight brightness and last backlight illumination be identical, if identical with last backlight illumination, start optical sensor and proceeds sampling; If different with last backlight illumination, first transfer the adjusting number of times that counter calculates backlight illumination within the time period of setting and whether surpass set point number, if surpassed, start optical sensor and proceed sampling; If do not surpassed, start backlight controller adjusting backlight luminance.
As the improvement of technique scheme, adjustment module backlight also comprises a counter, for calculating the adjusting number of times of backlight illumination within the time period of setting.
As the improvement of technique scheme, adjustment module backlight also comprises user's setting module, is convenient to backlight illumination to carry out from setting.
Embodiment of the present invention compared with prior art, the main distinction and effect thereof are: the present invention is applicable to mobile phone, the hand held devices such as PDA, the present invention carries out smoothing processing and adopts dynamic threshold control method the sampled data of light intensity, and sampled data is divided into a plurality of interval ranges, corresponding different light intensity grades, and add counter to regulate number of times to add up to the backlight illumination in setting-up time, the present invention not only improves degree of regulation by increasing progression with an automatic light meter, and in the situation that ambient light constantly changes around, also there will not be the situation of dodging screen, improve user's visual experience and reduce power consumption.
Accompanying drawing explanation
Below in conjunction with the drawings and specific embodiments, the present invention is described in further detail.
Fig. 1 is the schematic flow sheet of the method for the automatic adjusting backlight luminance of the present invention;
Fig. 2 is the detailed process schematic diagram of the method for the automatic adjusting backlight luminance of the present invention;
Fig. 3 is the framework schematic diagram of the device of the automatic adjusting backlight luminance of the present invention;
Fig. 4 is the framework schematic diagram of the interior adjustment module backlight of device of the automatic adjusting backlight luminance of the present invention.
Embodiment
For making the object, technical solutions and advantages of the present invention clearer, below in conjunction with accompanying drawing, embodiments of the present invention are described in further detail.
Refer to Fig. 1 and Fig. 2, the invention provides a kind of method of automatic adjusting backlight luminance, described method comprises the steps:
Step 1, obtain the sampled data of current light intensity.
In step 1, central processing unit 10 is controlled the sampled data that optical sensor 13 obtains light intensity, and the span of sampled data is [0,255], and value is larger, represents that light intensity is larger.
Step 2, sampled data is carried out to smoothing processing.
In step 2, by sampled data is carried out to the fluctuation that smoothing processing reduces sampled data, under a stable light intensity environment, little in different time sampled data difference, sampled data curvature of curve is less, should approach the mathematical expectation of light intensity by the sampled data after smoothing processing; Under a unsettled light intensity environment, larger in different time sampled data difference, obtain sampled data curvature of curve larger, by smoothing processing of the present invention, can obtain the curvature larger than arithmetic equal value algorithm (in the situation that light intensity is suddenlyd change, sampled data can be made fast reaction, time delay is lower), thus the fluctuation of minimizing sampled data.In the situation that light intensity has larger variation, smoothed data should have larger slope to show the variation of this light intensity.
Because outside light intensity is constantly to change, and is not a definite value therefore collect the sampled data of light intensity, but fluctuation within the specific limits, this data processing on the later stage is brought impact, and especially sampled data fluctuates near automatically regulating Intensity threshold backlight.
Particularly, the present invention has adopted Weighted Average Algorithm to remove the fluctuation of sampled data, and its basic thought is that current output valve Y is not only relevant with current sampled data, and simultaneously also relevant with a front N-1 sampled data, correlation represents with weight coefficient, X
irepresent sampled data.Arthmetic statement is as follows:
Wherein: ε
1, ε
2, ε
3... ε
nfor weight coefficient; And ε
1+ ε
2+ ε
3+ ...+ε
n=1.Generally can be write as following form:
ε wherein
1+ ε
2+ ε
3+ ...+ε
n=ε, and the ε power that is 2.
In preferred embodiment of the present invention, get ε=4, ε
1=6, ε
2=4, ε
3=3, ε
4=3.Certainly can revise these parameters according to real needs (such as factors such as smooth effect, operands) here.
By smoothing processing of the present invention, the fluctuating range of sampled data reduces, and has good inhibitory mutagenesis sampled value simultaneously, and this inhibition can prevent the impact that light intensity sudden change brings.
Step 3, determine current light intensity grade.
Obtain after the sampled data of smoothing processing, transfer light intensity class parameter table, as shown in table 1, according to sampled data, obtain corresponding current light intensity grade.
In preferred embodiment of the present invention, adopted eight grades of light intensities automatically to regulate backlight.When sampled data is less than or equal to 30, being first order light intensity, is second level light intensity when sampled data is greater than 30 when being less than or equal to 60, by that analogy.The benefit that adopts more light intensity progression is that precision with an automatic light meter is higher, more reduces power consumption.
Table 1 light intensity class parameter table
Step 4, determine current backlight brightness.
According to the brightness of current light intensity classification current backlight, first judge whether current luminosity sampling data fluctuate near Intensity threshold, if not, by table 2 backlighting parameters table, determine backlight illumination; If so, adopt dynamic threshold algorithm to regulate Intensity threshold, then according to backlighting parameters table, determine backlight illumination.
Table 2 backlighting parameters table
Described Intensity threshold, from table 1 light intensity class parameter table, draw 30,60,90,120,150,180,210, when table 1 and table 2 Near Threshold of user place light environment, adjustment form 1 and table 2 threshold value.
The present invention adopts the specific works flow process of dynamic threshold algorithm as follows:
If the sampled data that V is current light intensity, C is Intensity threshold, supposes that current light intensity grade is in a, between b grade:
When V≤C, light intensity grade is a grade;
When C-t < V < C+t, t represents undulating value, and when the sampled data of light intensity fluctuates near Intensity threshold, Intensity threshold C can rise to C+delta, and light intensity grade is a grade;
When V >=C, light intensity grade is b grade;
Next time,
When V≤C+delta, light intensity grade is a grade;
When C+delta-t < V < C+delta+t, when the sampled data of light intensity fluctuates near Intensity threshold, current Intensity threshold C+delta returns to initial value, and light intensity grade is b grade;
When V >=C+delta, light intensity grade is b grade;
In above formula, t gets 4, delta and gets 15, and this value can change the requirement of sampled data according to reality.Owing to having done smoothing processing above, to stablize under light intensity environment, the fluctuation of V is less.In said method, while fluctuating up and down while having avoided sampled data when light intensity at fixing Intensity threshold, backlight illumination is conditioned continually, thereby causes and dodge screen, causes bad user to experience, and has also increased power consumption simultaneously.When the sampled data of light intensity fluctuates near Intensity threshold, improve Intensity threshold, according to new Intensity threshold, again sampled data is judged, and then determine backlight illumination according to backlighting parameters table.
In the present invention, other are preferably in embodiment, table 1 relevant with particular hardware with table 2 (being the characteristic of optical sensor), and developer needs to remove reconciliation statement 1 and table 2 according to specific sensitization hardware.
Step 5, adjusting backlight luminance.
Step 5.1, first judge that whether the current backlight illumination obtaining is identical with previous backlight illumination, if not identical, performs step 5.2; If identical, backlight illumination is not regulated;
Whether step 5.2, judgement surpass the adjusting number of times of backlight illumination within the time period of setting, if surpass the adjusting number of times of setting, backlight illumination are not regulated; If do not surpass the adjusting number of times of setting, control 15 pairs of backlight illuminations of backlight controller and regulate.
Refer to Fig. 3 and Fig. 4, the present invention also provides a kind of device of automatic adjusting backlight luminance, and described device comprises central processing unit 10, and the adjustment module backlight 11 of being controlled by central processing unit 10, optical sensor 13, backlight controller 15 and internal memory 17.
Interior light intensity class parameter table and the backlighting parameters table preserved of internal memory 17.
Then transfer light intensity grade and confirm module 103, by the light intensity class parameter table of audit memory 17 interior preservations, according to luminosity sampling data, obtain corresponding light intensity grade with the corresponding relation between light intensity grade.
Transfer current backlight brightness and select module 105, by the backlighting parameters table of audit memory 17 interior preservations, according to the brightness of light intensity classification current backlight.First central processing unit 10 judged whether luminosity sampling data fluctuate near Intensity threshold before definite current backlight brightness, if while fluctuating near Intensity threshold, dynamically improve Intensity threshold, and then select corresponding current backlight brightness according to the Intensity threshold after improving.
Finally transfer backlight illumination comparison module 107, judge that whether current backlight brightness and last backlight illumination be identical, if identical with last backlight illumination, start optical sensor 13 and proceed sampling; If different with last backlight illumination, first transfer the adjusting number of times that counter 109 calculates backlight illumination within the time period of setting and whether surpass set point number, if surpassed, illustrate that backlight illumination regulates number of times too much, starts optical sensor 13 and proceeds sampling; If do not surpassed, illustrate that backlight illumination regulates number of times in the reasonable scope, make counter 109 add 1, start backlight controller 15.In the present invention, add counter 109, thereby avoided when surrounding environment light constantly changes, the backlight illumination of screen is constantly regulated, thereby cause and dodge screen, by counter 109 judgements backlight illumination within the time period of setting, regulate number of times whether at zone of reasonableness, if not at zone of reasonableness, illustrate that surrounding environment constantly changes, for example user is in subway, now without adjusting backlight luminance.
In preferred embodiment of the present invention, also be provided with a user who is connected with central processing unit 10 module 19 is set, this user arrange module 19 can carry out parameters such as light intensity class parameter table, backlighting parameters table, counters self-defined, or self-defined current backlight brightness.
Although pass through with reference to some of the preferred embodiment of the invention, the present invention is illustrated and described, but those of ordinary skill in the art should be understood that and can do various changes to it in the form and details, and without departing from the spirit and scope of the present invention.
Claims (8)
1. a method for automatic adjusting backlight luminance, is characterized in that, described method comprises the steps:
Step 1, the light intensity of current environment is sampled, obtain sampled data;
Step 2, sampled data is carried out to smoothing processing;
Step 3, according to the corresponding relation of light intensity grade and sampled data, according to sampled data, obtain corresponding current light intensity grade;
Step 4, according to the corresponding relation of light intensity grade and backlight illumination, determine current backlight brightness, specifically comprise and first judge whether current luminosity sampling data fluctuate near Intensity threshold, if not, by backlighting parameters table, determine backlight illumination; If while fluctuating near Intensity threshold C, improve Intensity threshold, and then select current backlight brightness according to the Intensity threshold C+delta after improving, wherein, current light intensity grade is in a, between b grade, when fluctuating near the luminosity sampling data V next time Intensity threshold C+delta after raising, current Intensity threshold C+delta is returned to initial value C, and now light intensity grade is b;
Step 5, according to above-mentioned current backlight brightness, carry out adjusting backlight luminance.
2. the method for automatic adjusting backlight luminance as claimed in claim 1, it is characterized in that, in step 2, adopt Weighted Average Algorithm to remove the fluctuation of sampled data, by calculating the correlation of current sampled data and a front N-1 sampled data, obtain the sampled data value Y of current output, Xi represents sampled data, ε
1, ε
2, ε
3... ε
nfor weight coefficient, and ε
1+ ε
2+ ε
3+ ...+ε
n=1:
3. the method for automatic adjusting backlight luminance as claimed in claim 2, is characterized in that, the scope of sampled data is 0 to 255, and it is divided into different interval ranges, respectively corresponding different light intensity grades.
4. the method for automatic adjusting backlight luminance as claimed in claim 1, is characterized in that, in step 5, also further comprises the steps:
First judge that whether current backlight brightness is identical with previous backlight illumination, if not identical, carry out next step; If identical, backlight illumination is not regulated, return to step 1;
Whether judgement surpasses the adjusting number of times of backlight illumination within the time period of setting, if surpassed, regulates number of times, backlight illumination is not regulated; If do not surpass and regulate number of times, backlight illumination is regulated.
5. the device of an automatic adjusting backlight luminance, it is characterized in that, described device comprises central processing unit, and the optical sensor of being controlled by central processing unit, backlight controller, adjustment module backlight and internal memory, the corresponding relation of light intensity grade and sampled data and the corresponding relation of light intensity grade and backlight illumination in internal memory, have been preserved, adjustment module backlight comprises smoothing processing module, light intensity grade is confirmed module, module is selected in current backlight brightness, backlight illumination comparison module and counter, optical sensor light intensity to surrounding environment under the control of central processing unit is sampled, obtain sampled data, and send central processing unit to, central processing unit is transferred light intensity grade and is confirmed module, corresponding relation by inquiry light intensity grade and sampled data obtains corresponding light intensity grade, and central processing unit is transferred backlight illumination and is selected module, according to the corresponding relation of light intensity grade and backlight illumination, determine current backlight brightness, be specially central processing unit and first judged whether luminosity sampling data fluctuate near Intensity threshold before definite current backlight brightness, if while fluctuating near Intensity threshold C, improve Intensity threshold, and then select current backlight brightness according to the Intensity threshold C+delta after improving, wherein, current light intensity grade is in a, between b grade, when fluctuating near the luminosity sampling data V next time Intensity threshold C+delta after raising, current Intensity threshold C+delta returned to initial value C, and now light intensity grade is b.
6. the device of automatic adjusting backlight luminance as claimed in claim 5, it is characterized in that, central processing unit is transferred backlight illumination comparison module, judges that whether current backlight brightness and last backlight illumination be identical, if identical with last backlight illumination, start optical sensor and proceed sampling; If different with last backlight illumination, first transfer the adjusting number of times that counter calculates backlight illumination within the time period of setting and whether surpass set point number, if surpassed, start optical sensor and proceed sampling; If do not surpassed, start backlight controller adjusting backlight luminance.
7. the device of automatic adjusting backlight luminance as claimed in claim 6, is characterized in that, adjustment module backlight also comprises a counter, for calculating the adjusting number of times of backlight illumination within the time period of setting.
8. the device of automatic adjusting backlight luminance as claimed in claim 5, is characterized in that, adjustment module backlight also comprises user's setting module, is convenient to backlight illumination to carry out from setting.
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Application publication date: 20120404 Assignee: Shanghai Li Ke Semiconductor Technology Co., Ltd. Assignor: Leadcore Technology Co., Ltd. Contract record no.: 2018990000159 Denomination of invention: Method and device automatically adjusting backlight luminance Granted publication date: 20140115 License type: Common License Record date: 20180615 |