CN102034442A - Method and device for adjusting backlight of liquid crystal display screen as well as terminal equipment - Google Patents
Method and device for adjusting backlight of liquid crystal display screen as well as terminal equipment Download PDFInfo
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- CN102034442A CN102034442A CN2009101907392A CN200910190739A CN102034442A CN 102034442 A CN102034442 A CN 102034442A CN 2009101907392 A CN2009101907392 A CN 2009101907392A CN 200910190739 A CN200910190739 A CN 200910190739A CN 102034442 A CN102034442 A CN 102034442A
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Abstract
The invention provides a method for adjusting backlight of a liquid crystal display screen. The backlight brightness is divided into multiple brightness grades from darkness to brightness, wherein all-on indicates the highest grade marked as the N-th brightness grade, and N is a positive integer greater than 1. The method comprises the following steps: A, obtaining the duty cycle of the current backlight brightness grade M of the liquid crystal display screen, and marking as the M-th grade duty cycle; B, obtaining the duty cycle of the next brightness grade (M-1) adjacent to the current brightness grade, and marking as the (M-1)th grade duty cycle; and C, dividing the interval between the (M-1)th grade duty cycle and the Mth grade duty cycle into multiple sections; reducing the backlight duty cycle of the liquid crystal display screen from the Mth grade duty cycle to the (M-1)th grade duty cycle in turn according to the division; and increasing the backlight duty cycle of the liquid crystal display screen from the (M-1)th grade duty cycle to the Mth grade duty cycle, wherein M is a positive integer and more than or equal to 1 and less than or equal to N. Through the invention, the power consumption of the terminal equipment is effectively reduced, and the terminal equipment using time is prolonged in the condition of limited power supply of batteries.
Description
Technical field
The invention belongs to electronic technology field, relate in particular to a kind of on terminal device Automatic adjustment method, device, and the terminal of LCD screen backlight.
Background technology
At present, LCDs is given and is widely used in every field, and the most general early stage application is a digital product, for example counter.Along with the size of LCDs in recent years is increasing, LCDs also is employed in other electronic equipments, the portable computer that for example is most widely used at present.
The existing the most frequently used LCD screen backlight control method of each big portable computer maker is to adopt PWM (pulse-length modulation) method.Particularly, the frequency of pre-fixed pwm signal reaches the purpose that changes backlight illumination by changing positive pulse width.LCD screen backlight brightness generally can be provided with 1～10 grade of scope according to different portable computer manufacturers, increase along with progression, the backlight of LCDs progressively brightens, wherein, for the complete dark situation of LCDs, do not count in the above-mentioned rank, that is to say that above-mentioned rank setting is secretly to complete bright scope from LCD.The user make positive pulse width change, thereby the backlight illumination of LCDs is set to user's request brightness by manually sending the demand that progression is adjusted.According to above-mentioned progression is divided in LCD screen backlight brightness, according to the characteristic of LCDs, in case progression is decided, the corresponding power consumption of LCDs is also decided.
For portable computer, occupied suitable ratio in the total power consumption of the power consumption of LCDs in entire equipment.Therefore, how to reduce power consumption, especially under the situation of the delivery of battery limited, reduce power consumption at portable computer, prolong the service time of portable computer, the variation of LCD screen backlight brightness is not simultaneously discovered out by the human body naked eyes, thereby do not influence user's visual effect, become the problem of each big portable computer maker research.
Summary of the invention
The present invention regulates the technical matters that manualization is inconvenient, do not reach reduction LCDs power consumption for solving the available liquid crystal display backlight, a kind of method of regulating LCD screen backlight is provided, automatically the regulator solution crystal display screen is backlight, reduces the purpose of LCDs power consumption.
For achieving the above object, a kind of method of regulating LCD screen backlight, described brightness backlight is from secretly being divided into some brightness degrees to bright, wherein bright entirely is highest ranking, is designated as the N brightness degree, and N is the positive integer greater than 1, wherein, this method comprises the following steps:
A, obtain the dutycycle of the current brightness degree M of LCD screen backlight, be designated as M level dutycycle;
B, obtain the dutycycle of next the brightness degree M-1 adjacent with described current brightness degree, be designated as M-1 level dutycycle, wherein, the backlight illumination of described next brightness degree M-1 is darker than the backlight illumination of current brightness degree M;
C, be plurality of sections with the interval division between M-1 level dutycycle and the M level dutycycle; Successively the dutycycle of LCD screen backlight is decreased to M-1 level dutycycle by M level dutycycle earlier according to above-mentioned division, increases to M level dutycycle by M-1 level dutycycle again; Wherein,
M is a positive integer, and 1＜M≤N.
Based on technique scheme, the invention allows for a kind of device of regulating LCD screen backlight, this device comprises:
The dutycycle extraction module, be used to obtain the dutycycle of the current brightness degree of LCD screen backlight, be designated as M level dutycycle, also be used to obtain the dutycycle of next brightness degree adjacent with described current brightness degree, be designated as M-1 level dutycycle, wherein, the backlight illumination of described next brightness degree M-1 is darker than the backlight illumination of current brightness degree M;
LCD screen backlight brilliance control module, being used for the M-1 level dutycycle that will get access to and the interval division between the M level dutycycle is plurality of sections; And generate pwm signal successively according to be decreased to the order that M-1 level dutycycle increases to M level dutycycle again by M level dutycycle with corresponding dutyfactor value according to above-mentioned division;
The LCDs administration module is used to LCDs that power supply is provided, and receives the pwm signal that described LCD screen backlight brilliance control module generates successively, to change the brightness of LCDs.
Based on technique scheme, the invention allows for a kind of terminal device, this terminal comprises the device of above-mentioned adjusting LCD screen backlight.
Compared with prior art, the present invention has the following advantages:
The method of adjusting LCD screen backlight of the present invention be by with the dutycycle of current backlight brightness degree pwm signal according to the dutycycle that slowly is reduced to next backlight illumination level pwm signal by the sinusoidal wave form, after this dutycycle of LCDs slowly is increased to the dutycycle of backlight illumination grade pwm signal again, go round and begin again PMW ripple dutycycle is changed by the sinusoidal wave rule, therefore reached the reduction consumed power of whole machine, simultaneously, through repeatedly experiment, find LCD screen backlight to be regulated with backlight adjusting method provided by the invention, the human body naked eyes can not feel sensitive to the backlight illumination of this slow variation, thereby reach under the prerequisite of the visual effect that does not influence the user, reduced power consumption of terminal equipment, saved the terminal device electric weight, and then reach under the situation of battery limited delivery, prolong the terminal device purpose of service time, can be widely used in the energy-conservation aspect of notebook computer.
Description of drawings
Fig. 1 is the method flow synoptic diagram of the embodiment that provides of the embodiment of the invention;
Fig. 2 is another embodiment software realization flow figure that the embodiment of the invention provides;
Fig. 3 is a pwm signal waveform synoptic diagram in the prior art;
Fig. 4 A is under the identical backlight illumination grade of implementing to provide than Fig. 3 the present invention one, pwm signal wave form varies synoptic diagram;
Fig. 4 B is under the identical backlight illumination grade of implementing to provide than Fig. 3 the present invention one, pwm signal change in duty cycle synoptic diagram;
Fig. 5 A is when adopting pwm signal shown in Figure 3 to regulate and control, the power attenuation figure of LCDs;
Fig. 5 B is when adopting the regulation and control of pwm signal shown in Fig. 4 A, the power attenuation figure of LCDs;
Fig. 6 is the apparatus structure framework synoptic diagram that a embodiment that the embodiment of the invention provides provides;
Fig. 7 is the apparatus structure framework synoptic diagram that another embodiment that the embodiment of the invention provides provides.
Embodiment
In order to make technical matters solved by the invention, technical scheme and beneficial effect clearer,, the present invention is further elaborated below in conjunction with drawings and Examples.Should be appreciated that specific embodiment described herein only in order to explanation the present invention, and be not used in qualification the present invention.
Need to prove that the term descriptions such as " first, second " in the present invention describes only is for convenience of description of the invention, and can not be interpreted as limitation of the present invention.
In the specific embodiment of the present invention, disclose a kind of method that is used to regulate LCD screen backlight, be applied to LCDs when the user uses, the adjustment of computerizable and robotization.It is applicable to terminal device this method.Those skilled in the art also can carry out adaptability revision to structure according to applied terminal device when enforcement is of the present invention.
In this manual; to as example terminal device be described with notebook computer; but those of ordinary skill is obviously known the product or the structure that this terminal device can be used for have LCDs; for example; PDA; the description of following specific embodiment is for exemplary purposes thus, and can not think the restriction to protection scope of the present invention.
As shown in Figure 1, be used to regulate the schematic flow sheet of the method embodiment of LCD screen backlight for the present invention is a kind of, the dutyfactor value when before carrying out this method, having preserved each backlight illumination grade of LCDs in advance.Particularly, described method comprises:
S101: obtain the dutycycle (being designated as current grade dutycycle) of the current brightness degree of LCD screen backlight,
S102: the dutycycle of next brightness degree adjacent (being designated as next grade dutycycle) with described current brightness degree, wherein, the backlight illumination of described next brightness degree is darker than the backlight illumination of current brightness degree;
S103: then by being plurality of sections with the interval division between current grade dutycycle and next the grade dutycycle, successively the dutycycle of LCD screen backlight is decreased to next grade dutycycle from current grade dutycycle earlier according to above-mentioned division, increases to current grade dutycycle by next grade dutycycle again.
On the basis based on technique scheme, the invention also discloses other method embodiment, this embodiment is responsible for by software section, and the control of LCD screen backlight is by embedded controller in the notebook hardware circuit: (EC:Embedded Controller) is responsible for control.For convenience of description, the inner used register of relevant EC carries out simple declaration below:
PRSC: have 16bit, value was 0x0000 after read-write clock source frequency division register, EC resetted, span 0x0000～0xFFFF, frequency division scope 1～65536 is 1 to the input clock frequency division when PRSC=0x0000, is 65536 to the input clock frequency division during PRSC=0xFFFF.
CTR: have 16bit, read-write period register, value was 0xFFFF after EC resetted, span 0x0000～0xFFFF, the value of CTR and PRSC has determined the cycle of output pwm signal, such as being that 25MHz will obtain the frequency that the PWM cycle is 1KHz, then set PRSC=24, CTR=999 when input clock.
PWMCTL: have 8bit, read-write control register is mainly used in and selects the input clock source and enable PMW control, main bit position explanation.Bit7 bans use of PWM when for " 0 ", enable PWM when for " 1 ".Bit1 is that the position is selected in PWM input clock source, and the input clock source is core clock when for " 0 ".The input clock source is 32KHz when for " 1 ".
DCR: have 16bit, read-write duty cycle register, value was 0x0000 after EC resetted, span 0x0000～0xFFFF, the setting value of this register has determined the positive pulse width value, so the dutycycle computing formula is ((DCR+1)/(CTR+1)) x 100.
LCDs adopts 7 grades of regulation and control in the present embodiment, be that the LCD screen backlight brightness degree is divided into 1～7 brightness degree, wherein the 1st grade represents that LCD screen backlight compares to brightness is secretly arranged entirely slightly, increase along with progression, LCD screen backlight is bright more, when LCD screen backlight brightness reaches 7 grades for the brightest.
In addition, the PWM frequency configuration of present embodiment is 892Hz, and EC selects Winbond WPCE776S for use, and core clock is set at 25MHz for convenience of description in the present embodiment.According to above-mentioned introduction, EC corresponding registers setting value is RSC=3, CTR=7000, PWMCTL=0x80, CTR is set at 7000, and (be variable Step=7000, CTR is set is 7000 is that Step for average each backlight illumination grade correspondence can be 1000, except that the 1st grade.)
See also Fig. 2, the process flow diagram that Fig. 2 carries out for the present embodiment program.This program is set to every 10ms and triggers execution successively, and promptly regularly be 10ms break period, thereby obtains regularly changing the dutyfactor value of pwm signal.Regularly setting the short more pwm signal that just can make more break period changes according to being similar to sine wave curve, the maximal value of this sine wave curve is the dutyfactor value of current backlight brightness degree correspondence, and the minimum value of this sine wave curve is the dutyfactor value of next backlight illumination grade correspondence.But regularly setting break period too short is occupying system resources very.When timing was set at 10ms break period, it was 20s that the dutycycle of every execution one-period changes the time cycle.This is (current brightness degree and next brightness degree poor) because the Step=1000 of average each LCD screen backlight brightness degree correspondence, one second program can carry out 100 times, so will use 10s to next backlight level from the current backlight change of rank, and then return current brightness degree time spent 10s again from next backlight illumination change of rank, therefore a period of change will be used 20s.
The program of present embodiment also will be set the bit variable of a byte, is used for changing as dutycycle the zone bit of direction, and the initial bit variate-value is 0, and wherein, on behalf of dutycycle, " 0 " increase progressively, and on behalf of dutycycle, " 1 " successively decrease.When dutycycle is decremented to next brightness degree dutycycle, above-mentioned bit variable will change over " 1 " by " 0 ", and when dutycycle was incremented to current brightness degree dutycycle, this bit variable changed over " 0 " by " 1 " afterwards.
Particularly, the software execution flow journey figure of present embodiment is as follows, in step 201, and the above-mentioned EC of initialization etc.Then, in step 202, judge whether to arrive 10ms and regularly interrupt, do not reach 10ms and regularly interrupt to monitor always, in case when reaching 10ms and regularly interrupting, enter step 203 again.
In step 203, judge that by above-mentioned bit variable whether the variation of dutycycle is for increasing progressively, when being changed to of dutycycle increases progressively, execution in step 204, judge that dutycycle is whether more than or equal to the dutycycle of current backlight brightness degree correspondence, if execution in step 205 then, change the change in duty cycle direction for successively decreasing, being about to bit variable is set to " 1 " and returns above-mentioned steps 202, when dutycycle during less than the dutycycle of current backlight brightness degree correspondence, execution in step 206, dutycycle is added 1, and promptly Step increases by 1, and LCDs will be regulated backlight illumination according to the dutyfactor value of above-mentioned new settings, be back to step 202 after the program execution of step 206 and rejudge whether arrived regularly break period, this moment, the brightness of LCDs increased gradually.
If in step 203, judge change in duty cycle not for increasing progressively, then execution in step 207, judge that dutycycle is whether smaller or equal to the dutycycle of next backlight illumination grade correspondence, if execution in step 208 then, change the change in duty cycle direction for increasing progressively, being about to bit variable is set to " 0 " and returns above-mentioned steps 202, when dutycycle during greater than the dutycycle of next backlight illumination grade correspondence, execution in step 209, dutycycle is subtracted 1, be that Step reduces 1, LCDs will be regulated backlight illumination according to the dutyfactor value of above-mentioned new settings, be back to step 202 after the program execution of step 206 and rejudge whether arrived regularly break period, and the brightness of LCDs is in deepening gradually at this moment.
See also 3, illustrated the pwm signal waveform that utilizes prior art to pass through the pwm signal point brightness liquid crystal display screen of fixed duty cycle among Fig. 3, wherein the pwm signal dutycycle is 74.1% (for the LCDs of setting 7 backlight illumination grades, dutycycle is that the backlight illumination grade of 74.1% correspondence is the 5th grade), Fig. 5 A dash area illustrates corresponding power consumption.
See also Fig. 4, than Fig. 3, Fig. 4 illustrated and utilized method of the present invention to adopting the regulation and control of 7 grades of pwm signals, and the LCDs that is in the 5th grade backlight illumination is carried out adjusting backlight.Because be 7 grades of pwm signal regulation and control, so average every grade of dutycycle is about 14.3%, Step=1000, and the dutycycle position of the 5th grade backlight illumination grade correspondence is 71.4%, Step=5000, the corresponding dutycycle of next backlight illumination grade (i.e. the 4th grade of backlight illumination grade) is 57.1%, Step=4000.As shown in Figure 4, dutycycle changes between the dutycycle of the 5th grade backlight illumination grade correspondence dutycycle corresponding with the 4th grade backlight illumination grade.Particularly, last half period: dutycycle is decreased to 64.3% (wherein Step has reduced 100) by 71.4% after 1 second, dutycycle is reduced to 58.6% (wherein Step has reduced 500) after 5 seconds, and dutycycle is decreased to 57.1% after 10 seconds, i.e. the dutycycle of the 4th backlight illumination grade correspondence; Following half period: dutycycle increases to 58.6% (wherein Step has increased progressively 100) by 57.1% after 1 second, dutycycle is increased to 64.3% (wherein Step has increased progressively 500) after 5 seconds, dutycycle increases to 71.4% after 10 seconds, promptly the dutycycle of the 5th backlight illumination grade correspondence is finished above-mentioned one-period and was changed needs 20 seconds.When backlight liquid crystal display brightness is not reset, the pwm signal dutycycle will change according to above-mentioned sinusoidal wave Changing Pattern again and again, see also Fig. 4 C, it is not to be 0% from dutycycle that the starting point of this change begins from the next stage dutycycle.
See also Fig. 5 B, the dash area among Fig. 5 B illustrates the corresponding power consumption of the inventive method.From figure, clearly find out intuitively and adopt power that the inventive method consumed will be far smaller than the fixedly power that consumed of pwm signal dutycycle of prior art.
Further, when the user during at notebook computer with the backlight illumination level setting of LCDs for more rudimentary, for example the 1st grade or the 2nd grade.Because when above-mentioned brightness degree, LCD screen backlight brightness is darker, in order not allow the human body naked eyes can feel that tangible brightness is changing, above-mentioned backlight adjusting method can carry out suitable correction.Particularly, step 207 judges that dutycycle whether less than the dutycycle of next backlight illumination grade correspondence, is modified to: judge whether dutycycle is the 1st grade or the 2nd grade, if dutycycle is to be in the 1st grade or the 2nd grade then will suitably to increase a Δ Step value.For the backlight illumination grade is divided into 7 grades LCDs, dutycycle can be done variation between the current brightness degree dutycycle from 107% beginning more than or equal to next brightness degree dutycycle.Below to adopt 7 grades of PWM regulation and control, and it is that example specifies that the backlight illumination grade is operated in the 2nd grade: when the backlight illumination grade is the 2nd grade, corresponding Step is 2000, and next backlight illumination grade is the 1st grade so, and the Step of this grade correspondence is 1000.This moment, the scope with change in duty cycle was modified between 1500～2000, make in above-mentioned scope and be similar to sinusoid and change by regulating dutycycle, reach under the prerequisite of the visual effect that does not influence the user, reduced power consumption of terminal equipment, saved the terminal device electric weight, and then reach under the situation of the delivery of battery limited, the purpose that prolongs the service time of terminal device can be widely used in the energy-conservation aspect of notebook computer.Backlight for adopting different progression PWM to regulate and control, the dutyfactor value of each rank correspondence is different.For the embodiment of the invention is better understood, will 1000 Step have been marked off between two adjacent backlight illumination grades in the present embodiment.From the above, backlight for different progression PWM regulation and control, the dutyfactor value of each Step correspondence also is inequality.LCD screen backlight brightness is darker, in order not allow the human body naked eyes can feel that tangible brightness is changing, during to above-mentioned backlight adjusting method correction, present embodiment is to have increased the end points of Δ Step as new change in duty cycle interval at the Step of next backlight illumination grade correspondence, and wherein Δ Step value is 500.Certainly Δ Step can get other numerical value.Further the span of Δ Step is 500 to 1000 scope, but for more effective reduction power consumption, and Δ Step gets less value as far as possible in above-mentioned span.One embodiment of the invention proposes: when the current backlight illumination of LCDs is the 1st grade, with first revise dutycycle and the 1st grade of dutycycle and between interval division be plurality of sections, the described first correction dutycycle is the 1st grade of arbitrary dutyfactor value in dutycycle 57% to 90% scope; Successively the dutycycle of LCD screen backlight is decreased to the first correction dutycycle by the 1st grade of dutycycle according to above-mentioned division, revises dutycycle by first again and increase to the 1st grade of dutycycle.Same, when the current backlight illumination of LCDs is the 2nd grade, with second revise dutycycle and the 2nd dutycycle and between interval division be plurality of sections, the described second correction dutycycle is the 2nd grade of arbitrary dutyfactor value in dutycycle 57% to 90% scope; Successively the dutycycle of LCD screen backlight is decreased to second by the 2nd grade of dutycycle and revises dutycycle according to above-mentioned, revise dutycycle by second again and increase to the 2nd grade of dutycycle.In above-mentioned scope, carry out change in duty cycle and can reach under the prerequisite of the visual effect that does not influence the user, reduced the effect of power consumption of terminal equipment.
The method that is used to regulate LCD screen backlight of the present invention be by with the dutycycle of current backlight brightness degree pwm signal according to the dutycycle that slowly is reduced to next backlight illumination level pwm signal by the sinusoidal wave form, after this dutycycle of LCDs slowly is increased to the dutycycle of backlight illumination grade pwm signal again, go round and begin again PMW ripple dutycycle is changed by the sinusoidal wave rule, therefore reached the reduction consumed power of whole machine, simultaneously, through repeatedly experiment, find LCD screen backlight to be regulated with backlight adjusting method provided by the invention, the human body naked eyes can not feel sensitive to the backlight illumination of this slow variation, thereby reach under the prerequisite of the visual effect that does not influence the user, reduced power consumption of terminal equipment, saved the terminal device electric weight, and then reach under the situation of the delivery of battery limited, the purpose that prolongs the service time of terminal device can be widely used in the energy-conservation aspect of notebook computer.
See also Fig. 6, on the basis based on said method, one embodiment of the invention also provides a kind of terminal device, and this terminal device comprises the device that is used to regulate LCD screen backlight, and this device comprises:
Dutycycle extraction module 10, be used to obtain the dutycycle of the current brightness degree of LCD screen backlight, be designated as M level dutycycle, also be used to obtain the dutycycle of next brightness degree adjacent with described current brightness degree, be designated as M-1 level dutycycle, wherein, the backlight illumination of described next brightness degree M-1 is darker than the backlight illumination of current brightness degree M;
LCD screen backlight brilliance control module 20, being used for the M-1 level dutycycle that will get access to and the interval division between the M level dutycycle is plurality of sections; And generate pwm signal successively according to be decreased to the order that M-1 level dutycycle increases to M level dutycycle again by M level dutycycle with corresponding dutyfactor value according to above-mentioned division;
LCDs administration module 30 is used to LCDs that power supply is provided, and receives the pwm signal that described LCD screen backlight brilliance control module generates successively, to change the brightness of LCDs.
See also Fig. 7, further, said apparatus also comprises: the LCD screen backlight brightness degree is judged execution module 40, be used to judge whether the current brightness degree of described LCD screen backlight is second brightness degree or the 3rd brightness degree, when the current brightness degree of judging described LCD screen backlight is second brightness degree or the 3rd brightness degree, then generate and revise dutycycle, described correction dutycycle is the arbitrary dutyfactor value in M level dutycycle 30% to 70% scope.At this moment, LCD screen backlight brilliance control module 20 is plurality of sections according to M level dutycycle and correction dutycycle with the interval division between above-mentioned two dutycycles; And revise the order that dutycycle increases to M level dutycycle again and generate pwm signal successively according to being decreased to corresponding dutyfactor value by M level dutycycle according to above-mentioned division.
Further, described device also comprises the dutycycle memory module, is used to preserve the dutyfactor value of each brightness degree correspondence of LCD screen backlight.
See also following table 1 to table 2, table 1 is not for using said apparatus, when LCDs is adopted 7 grades of pwm signals modulation, and the voltage of each brightness degree correspondence that tests out, maximum current, average current and institute's power consumed.Table 2 has illustrated at above-mentioned LCDs, adopt apparatus of the present invention to carry out voltage, maximum current, average current and institute's power consumed of each brightness degree correspondence of testing out after the LCD screen backlight brightness regulation, wherein last row of table 2 have illustrated two kinds of difference powers that LCDs is consumed under each brightness degree.By following two the table to, obviously can find to adopt the present invention that LCDs is carried out the backlight illumination adjusting and can greatly reduce power consumption of terminal equipment, saved the terminal device electric weight, and then reach under the situation of the delivery of battery limited the purpose that prolongs the service time of terminal device.
Table 1
Table 2
From test data, can draw simultaneously, when setting identical backlight illumination grade, use high-power LCDs of the present invention can save down more power consumption.For example, LCDs with a 7W and 14W, equally all be set at 7 backlight level and carry out the pwm signal regulation and control, it is 0.36W that the LCDs of 7W can be saved power consumption, and the LCDs of 14W can be saved 0.72W, The above results also can obtain this conclusion by mathematical computations, particularly
Formula 1 is for to utilize the present invention LCDs to be carried out the computing formula of each brightness degree power of brightness regulation.
Because the present invention by with the dutycycle of current backlight brightness degree pwm signal according to the dutycycle that slowly is reduced to next backlight illumination level pwm signal by the sinusoidal wave form, after this dutycycle of LCDs slowly is increased to the dutycycle of backlight illumination grade pwm signal again, go round and begin again PMW ripple dutycycle is changed by the sinusoidal wave rule, so during Theoretical Calculation, adopt the offset of sinusoidal signal to carry out integration in the formula 1, in the formula, P represents the residing backlight illumination grade of LCDs power sum-total average, P
2Expression power effective value, above-mentioned effectively on duty in
Be exactly maximal value, promptly
Be maximal value, P
M-1The power effective value of representing next backlight illumination grade correspondence, ω are angular frequency, and its value equals ω=2 π f, and f equals 1/20th.Can infer according to formula 1, the performance number that adopts the technology of the present invention to take precautions against the LCDs after improving is the power that the intrinsic pwm signal dutycycle of employing next backlight illumination grade when LCDs is regulated and control is consumed, and increases by one again by sinusoidal wave positive axis Changing Pattern and maximal value to be
Power section.Wherein
Poor for adjacent two power.
When adopting that fixedly the pwm signal dutycycle is regulated and control LCDs, before promptly improving, equally under the backlight illumination grade prerequisite, adopt the power of the LCDs that not improvement method obtains to be
It (is P that this performance number and P when regulation and control have been carried out improving to LCD screen backlight (promptly adopt technical solution of the present invention, the power that same backlight illumination is consumed down) are deducted the corresponding performance number of next backlight illumination grade
M-1) after, the ratio of both power that obtain is
Thereby can learn that after adopting technical solution of the present invention to improve under the identical time loss LCDs can be saved and do not improved 36% of preceding two adjacent brightness degree power consumption differences.
By theoretical analysis can by in table 1, the table 2 test data can be verified.For example in table 1, when the current backlight brightness degree was the 7th grade of brightness degree, the power of this brightness degree correspondence was 2.21526192W.Next backlight illumination grade, promptly the power of the 6th grade of brightness degree correspondence is 1.82923559W, then can draw, and is above-mentioned
Therefore theoretical saving power consumption is: 0.38602633 * 0.36 ≈ 0.13896947.The power that obtains actual test saving according to table 2 is 0.19341792, a quantity grade, but certain phase difference is arranged, this is to be undertaken by software simulation because of above-mentioned analysis, can only simulate in the formula sinusoidal wave with the time interval, but can not accomplish fully to regulate and control with sine wave, so the actual test value in the table 2 be larger than the above-mentioned theory calculated value.
The above only is preferred embodiment of the present invention, not in order to restriction the present invention, all any modifications of being done within the spirit and principles in the present invention, is equal to and replaces and improvement etc., all should be included within protection scope of the present invention.
Claims (10)
1. method of regulating LCD screen backlight, described brightness backlight be from secretly being divided into some brightness degrees to bright, wherein complete bright is highest ranking, be designated as the N brightness degree, N is the positive integer greater than 1, it is characterized in that, this method comprises the following steps:
A, obtain the dutycycle of the current brightness degree M of LCD screen backlight, be designated as M level dutycycle;
B, obtain the dutycycle of next the brightness degree M-1 adjacent with described current brightness degree, be designated as M-1 level dutycycle, wherein, the backlight illumination of described next brightness degree M-1 is darker than the backlight illumination of current brightness degree M;
C, be plurality of sections with the interval division between M-1 level dutycycle and the M level dutycycle; Successively the dutycycle of LCD screen backlight is decreased to M-1 level dutycycle by M level dutycycle according to above-mentioned division, increases to M level dutycycle by M-1 level dutycycle again; Wherein,
M is a positive integer, and 1≤M≤N.
2. the method for adjusting LCD screen backlight as claimed in claim 1 is characterized in that, the interval between the dutycycle of the dutycycle of current brightness degree M and next brightness degree M-1 evenly is divided into plurality of sections.
3. the method for adjusting LCD screen backlight as claimed in claim 1 or 2, it is characterized in that, when M=1, step C is, with first revise dutycycle and the 1st grade of dutycycle and between interval division be plurality of sections, the described first correction dutycycle is the 1st grade of arbitrary dutyfactor value in dutycycle 57% to 90% scope; Successively the dutycycle of LCD screen backlight is decreased to the first correction dutycycle by the 1st grade of dutycycle according to above-mentioned division, revises dutycycle by first again and increase to the 1st grade of dutycycle.
4. the method for adjusting LCD screen backlight as claimed in claim 3, it is characterized in that, when M=2, step C comprises, with second revise dutycycle and the 2nd dutycycle and between interval division be plurality of sections, the described second correction dutycycle is the 2nd grade of arbitrary dutyfactor value in dutycycle 57% to 90% scope; Successively the dutycycle of LCD screen backlight is decreased to second by the 2nd grade of dutycycle and revises dutycycle according to above-mentioned, revise dutycycle by second again and increase to the 2nd grade of dutycycle.
5. a device of regulating LCD screen backlight is characterized in that,
The dutycycle extraction module, be used to obtain the dutycycle of the current brightness degree of LCD screen backlight, be designated as M level dutycycle, also be used to obtain the dutycycle of next brightness degree adjacent with described current brightness degree, be designated as M-1 level dutycycle, wherein, the backlight illumination of described next brightness degree M-1 is darker than the backlight illumination of current brightness degree M;
LCD screen backlight brilliance control module, being used for the M-1 level dutycycle that will get access to and the interval division between the M level dutycycle is plurality of sections; And generate pwm signal successively according to be decreased to the order that M-1 level dutycycle increases to M level dutycycle again by M level dutycycle with corresponding dutyfactor value according to above-mentioned division;
The LCDs administration module is used to LCDs that power supply is provided, and receives the pwm signal that described LCD screen backlight brilliance control module generates successively, to change the brightness of LCDs.
6. the device of adjusting LCD screen backlight as claimed in claim 5 is characterized in that, also comprises:
The LCD screen backlight brightness degree is judged execution module, be used to judge whether the current brightness degree of described LCD screen backlight is second brightness degree or the 3rd brightness degree, when the current brightness degree of judging described LCD screen backlight is second brightness degree or the 3rd brightness degree, then generate and revise dutycycle, described correction dutycycle is the arbitrary dutyfactor value in M level dutycycle 57% to 90% scope;
LCD screen backlight brilliance control module is used to obtain described M level dutycycle and revises dutycycle, is plurality of sections with the interval division between M level dutycycle and the correction dutycycle; And revise the order that dutycycle increases to M level dutycycle again and generate pwm signal successively according to being decreased to corresponding dutyfactor value by M level dutycycle according to above-mentioned division.
7. as the device of claim 5 or 6 described adjusting LCD screen backlights, it is characterized in that, also comprise the dutycycle memory module, be used to preserve the dutyfactor value of each brightness degree correspondence of LCD screen backlight.
8. a terminal device is characterized in that, comprises the device of regulating LCD screen backlight, and described device comprises:
The dutycycle extraction module, be used to obtain the dutycycle of the current brightness degree of LCD screen backlight, be designated as M level dutycycle, also be used to obtain the dutycycle of next brightness degree adjacent with described current brightness degree, be designated as M-1 level dutycycle, wherein, the backlight illumination of described next brightness degree M-1 is darker than the backlight illumination of current brightness degree M;
LCD screen backlight brilliance control module, being used for the M-1 level dutycycle that will get access to and the interval division between the M level dutycycle is plurality of sections; And generate pwm signal successively according to be decreased to the order that M-1 level dutycycle increases to M level dutycycle again by M level dutycycle with corresponding dutyfactor value according to above-mentioned division;
The LCDs administration module is used to LCDs that power supply is provided, and receives the pwm signal that described LCD screen backlight brilliance control module generates successively, to change the brightness of LCDs.
9. terminal device as claimed in claim 8 is characterized in that, described device also comprises:
The LCD screen backlight brightness degree is judged execution module, be used to judge whether the current brightness degree of described LCD screen backlight is second brightness degree or the 3rd brightness degree, when the current brightness degree of judging described LCD screen backlight is second brightness degree or the 3rd brightness degree, then generate and revise dutycycle, described correction dutycycle is the arbitrary dutyfactor value in M level dutycycle 57% to 90% scope;
LCD screen backlight brilliance control module is used to obtain described M level dutycycle and revises dutycycle, is plurality of sections with the interval division between M level dutycycle and the correction dutycycle; And revise the order that dutycycle increases to M level dutycycle again and generate pwm signal successively according to being decreased to corresponding dutyfactor value by M level dutycycle according to above-mentioned division.
10. terminal device as claimed in claim 8 or 9 is characterized in that described device also comprises the dutycycle memory module, is used to preserve the dutyfactor value of each brightness degree correspondence of LCD screen backlight.
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