CN106205503A - A kind of LED luminance control method and device - Google Patents
A kind of LED luminance control method and device Download PDFInfo
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- CN106205503A CN106205503A CN201610628819.1A CN201610628819A CN106205503A CN 106205503 A CN106205503 A CN 106205503A CN 201610628819 A CN201610628819 A CN 201610628819A CN 106205503 A CN106205503 A CN 106205503A
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- G—PHYSICS
- G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
- G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
- G09G3/00—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes
- G09G3/20—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters
- G09G3/34—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters by control of light from an independent source
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Abstract
The present embodiments relate to Display Technique field, particularly relate to a kind of LED luminance control method and device, can be with balance power consumption and the scheme of the duration of brightness flop process for offer one.In the embodiment of the present invention, obtain the object brightness of LED；When determining that object brightness is inconsistent with the present intensity of LED, according to object brightness, determine the first brightness and the second brightness；It is voltage corresponding to the first brightness by the Voltage Cortrol of LED, and the dutycycle of LED is adjusted to the PWM duty cycle that the second brightness is corresponding, so that the brightness of LED is issued to object brightness in the effect of PWM duty cycle corresponding to voltage corresponding to the first brightness and the second brightness.Present invention achieves the balance between power consumption and the duration of brightness flop process when regulating LED luminance, both ensured that power consumption will not be excessive, also ensure that the duration of LED luminance change procedure will not be long.
Description
Technical field
The present embodiments relate to Display Technique field, particularly relate to a kind of LED luminance control method and device.
Background technology
At present, light emitting diode (Light Emitting Diode, be called for short LED) in use, the merit of its backlight
Consumption accounts for major part in the power consumption of LED, in order to by the lower power consumption of LED, need to be reduced by the brightness of regulation LED-backlit
Power consumption.
In prior art, mainly having the brightness of two kinds of method regulation LED, a kind of method is that voltage control method (is i.e. simulated
Light modulation), this control method is carried in the voltage of LED by adjustment and regulates the brightness of LED, specifically, by the electricity of LED
Pressure is adjusted to target voltage, and LED is slowly changed to the brightness that target voltage is corresponding from present intensity, corresponding bright of target voltage
Reaching steady statue at degree, LED is changed to brightness corresponding to target voltage from present intensity to be needed through a duration.Generally,
This duration is longer, but relatively low by the mode power consumption of voltage-regulation LED luminance.
Another kind of method is pulse width modulation (Pulse Width Modulation is called for short PWM) Duty ratio control side
Method (i.e. digital dimming), the PWM duty cycle that this control method flickers by adjusting power supply carrys out adjusting brightness of LED lamps, specifically comes
Say, by the break-make of inverter circuit switching device is controlled, make outfan obtain the pulse that a series of amplitude is equal, one
The ratio that in pulse period, high level accounted in the whole cycle is exactly PWM duty cycle.The dutycycle of LED is adjusted to target PWM
Dutycycle, the brightness of LED is from brightness corresponding to present intensity Rapid Variable Design to target PWM duty cycle.By regulation PWM duty cycle
Mode when regulating the brightness of LED, it is corresponding that the brightness of LED quickly can be changed to target PWM duty cycle from present intensity
Brightness, but this kind of regulative mode power consumption is higher.
At present, in prior art, the main control method of any one used in both the above method carries out the bright of LED
Degree regulation.Individually use voltage control method power consumption less, but the brightness flop process of LED is longer, i.e. LED is through the longest
Time brightness can be only achieved steady statue；Individually use PWM duty cycle control method brightness flop process shorter, i.e. LED passes through
The shortest time brightness i.e. reaches steady statue, but power consumption is bigger.At present when regulating the brightness of LED display, there is no one
Individual can therefore need corresponding solution badly with balance power consumption and the method for the duration of brightness flop process.
Summary of the invention
The embodiment of the present invention provides a kind of LED luminance control method and device, in order to realize the merit when regulating LED luminance
Consume with the duration of brightness flop process between balance, both ensured that power consumption will not be excessive, also ensure LED luminance change procedure time
Length will not be long.
The embodiment of the present invention provides a kind of LED brightness adjusting method, including:
Obtain the object brightness of LED；
When the present intensity determining object brightness and LED is inconsistent, according to object brightness, determine the first brightness and the
Two brightness；
It is voltage corresponding to the first brightness by the Voltage Cortrol of LED, and it is corresponding that the dutycycle of LED is adjusted to the second brightness
PWM duty cycle so that the brightness of LED is in the effect of PWM duty cycle corresponding to voltage corresponding to the first brightness and the second brightness
It is issued to object brightness.
Alternatively, when object brightness is more than the present intensity of LED, the first brightness is less than object brightness, and object brightness is little
In the second brightness；
When object brightness is less than the present intensity of LED, the first brightness is more than object brightness, and object brightness is bright more than second
Degree.
Alternatively, the dutycycle of LED is adjusted to the PWM duty cycle that the second brightness is corresponding, including:
Determine the 3rd brightness；Wherein, when object brightness is more than the present intensity of LED, the 3rd brightness is more than the second brightness；Mesh
When mark brightness is less than the present intensity of LED, the 3rd brightness is less than the second brightness；
The dutycycle of LED is adjusted to the PWM duty cycle that the 3rd brightness is corresponding, and maintains the target duration preset；
At the target duration through presetting, the dutycycle of LED is adjusted to the PWM duty cycle that the second brightness is corresponding.
Alternatively, target duration meets following condition:
It is voltage corresponding to the first brightness by the Voltage Cortrol of LED, the dutycycle of LED is adjusted to the 3rd brightness simultaneously
Corresponding PWM duty cycle, and when maintaining target duration:
LED luminance reaches object brightness.
Alternatively, target duration is less than: after being voltage corresponding to the first brightness by the Voltage Cortrol of LED, LED is bright first
The voltage that degree is corresponding is issued to the duration of steady statue；Or
Target duration is equal to: after being voltage corresponding to the first brightness by the Voltage Cortrol of LED, and LED is corresponding in the first brightness
Voltage be issued to the half of duration of steady statue.
The embodiment of the present invention provides a kind of LED brightness regulating apparatus, including:
Acquiring unit, for obtaining the object brightness of LED；
Determine unit, for when determining that object brightness is inconsistent with the present intensity of LED, according to object brightness, determining
Go out the first brightness and the second brightness；
Adjustment unit, for being voltage corresponding to the first brightness by the Voltage Cortrol of LED, and adjusts the dutycycle of LED
It is PWM duty cycle corresponding to the second brightness, so that the brightness of LED is corresponding at voltage corresponding to the first brightness and the second brightness
The effect of PWM duty cycle is issued to object brightness.
Alternatively, when object brightness is more than the present intensity of LED, the first brightness is less than object brightness, and object brightness is little
In the second brightness；
When object brightness is less than the present intensity of LED, the first brightness is more than object brightness, and object brightness is bright more than second
Degree.
Optionally it is determined that unit, it is additionally operable to:
Determine the 3rd brightness；Wherein, when object brightness is more than the present intensity of LED, the 3rd brightness is more than the second brightness；Mesh
When mark brightness is less than the present intensity of LED, the 3rd brightness is less than the second brightness；
Adjustment unit, when the dutycycle of LED is adjusted to PWM duty cycle corresponding to the second brightness, is used for:
The dutycycle of LED is adjusted to the PWM duty cycle that the 3rd brightness is corresponding, and maintains the target duration preset；
At the target duration through presetting, the dutycycle of LED is adjusted to the PWM duty cycle that the second brightness is corresponding.
Alternatively, target duration meets following condition:
It is voltage corresponding to the first brightness by the Voltage Cortrol of LED, the dutycycle of LED is adjusted to the 3rd brightness simultaneously
Corresponding PWM duty cycle, and when maintaining target duration:
LED luminance reaches object brightness.
Alternatively, target duration is less than: after being voltage corresponding to the first brightness by the Voltage Cortrol of LED, LED is first
Voltage corresponding to brightness is issued to the duration of steady statue；Or
Target duration is equal to: after being voltage corresponding to the first brightness by the Voltage Cortrol of LED, and LED is corresponding in the first brightness
Voltage be issued to the half of duration of steady statue.
In the embodiment of the present invention, obtain the object brightness of LED；Determining that object brightness is inconsistent with the present intensity of LED
Time, according to object brightness, determine the first brightness and the second brightness；It is voltage corresponding to the first brightness by the Voltage Cortrol of LED；
And the dutycycle of LED is adjusted to the PWM duty cycle that the second brightness is corresponding, so that LED is at voltage and corresponding to the first brightness
It is object brightness that the effect of the PWM duty cycle that two brightness are corresponding is issued to the brightness of steady statue.Visible, the embodiment of the present invention
In, both regulate the voltage of LED, also regulate the PWM duty cycle of LED, therefore LED is in voltage corresponding to the first brightness and the second brightness
The brightness that the common effect of corresponding PWM duty cycle is issued to steady statue is object brightness, so, on the one hand, compare existing
In technology by the way of the brightness of individually voltage-regulation LED of regulation LED, the embodiment of the present invention additionally uses PWM duty
The regulative mode of ratio, therefore the embodiment of the present invention can be accelerated the brightness of LED and reaches the time of object brightness；On the other hand, phase
In mode than the PWM duty cycle individually regulating LED in prior art, the voltage of LED is always maintained at maximum, immutable
Dynamic, in the embodiment of the present invention while using PWM duty cycle to be adjusted, also the voltage of LED is adjusted, therefore can make
The voltage of LED need not maintain maximum always, thus reduces the power consumption of LED luminance condition, it is achieved thereby that at regulation LED
The balance between power consumption and the duration of brightness flop process during brightness, had both ensured that power consumption will not be excessive, also ensured that LED luminance becomes
The duration of change process will not be long.
Accompanying drawing explanation
For the technical scheme being illustrated more clearly that in the embodiment of the present invention, in embodiment being described below required for make
Accompanying drawing briefly introduce.
Fig. 1 is a kind of system structure schematic diagram that the embodiment of the present invention is suitable for；
A kind of LED luminance control method schematic flow sheet that Fig. 2 provides for the embodiment of the present invention；
The brightness of a kind of LED that Fig. 2 a provides for the embodiment of the present invention and time history；
The brightness of the another kind of LED that Fig. 2 b provides for the embodiment of the present invention and time history；
The curve chart of a kind of LED luminance regulation that Fig. 2 c provides for the embodiment of the present invention；
The brightness of a kind of LED that Fig. 2 d provides for the embodiment of the present invention and power relation curve chart；
The structural representation of a kind of LED luminance adjusting means that Fig. 3 provides for the embodiment of the present invention.
Detailed description of the invention
In order to make the purpose of the present invention, technical scheme and beneficial effect clearer, below in conjunction with accompanying drawing and enforcement
Example, is further elaborated to the present invention.Should be appreciated that specific embodiment described herein is only in order to explain this
Bright, it is not intended to limit the present invention.
Fig. 1 is a kind of system structure schematic diagram that the embodiment of the present invention is suitable for, as it is shown in figure 1, the embodiment of the present invention is suitable for
System structure 100 include LED101, LED luminance adjusting means 102, voltage-operated device 103, and PWM duty cycle controls
Device 104.
LED101 can be the backlight of television set, computer, mobile phone display screen, and in the embodiment of the present invention, its brightness regulation is subject to
Voltage-operated device 103 and PWM duty cycle control the control of device 104.Voltage-operated device 103 output voltage is extremely
LED101, reaches to regulate the purpose of the brightness of LED101 by adjusting the voltage of LED.It is defeated that PWM duty cycle controls device 104
Go out PWM duty cycle to LED101, reach to adjust the purpose of the brightness of LED101 by adjusting the PWM duty cycle of LED.
In a circuit, when only being adjusted the brightness of LED by the voltage of adjustment LED, in the brightness of LED and LED
The voltage loaded has certain functional relationship, and the voltage therefore loaded on the brightness of LED and LED has one-to-one relationship.When
When only being adjusted the brightness of LED by the PWM duty cycle of LED, the brightness of LED and circuit are also had by the PWM duty cycle of LED
Certain functional relationship, the brightness of LED has certain functional relationship with by the PWM duty cycle of LED, therefore the brightness of LED and
One-to-one relationship is had by the PWM duty cycle of this LED.
In the embodiment of the present invention, the voltage of LED and the PWM duty cycle of LED can be adjusted simultaneously, reach to adjust LED luminance
Purpose.Alternatively, the detailed process of LED luminance regulation is: adjust voltage-operated device 103 by LED luminance adjusting means 102
Output voltage, make the output voltage of voltage-operated device 103 reach the voltage that the first brightness is corresponding；Adjust PWM duty cycle control
The PWM duty cycle of device 104 processed so that it is reach the PWM duty cycle that the second brightness is corresponding, thus LED101 is corresponding in the first brightness
Voltage and the common effect of PWM duty cycle corresponding to the second brightness be issued to object brightness.
LED luminance adjusting means 102 is for voltage-operated device 103 output signal, to reach to adjust Control of Voltage dress
Put the purpose of the voltage of 103 outputs；LED luminance adjusting means 102 is used for controlling device 104 output signal to PWM duty cycle, with
Reach to adjust the purpose of the PWM duty cycle that PWM duty cycle controls device 104 output.
Based on system shown in Figure 1 structure, Fig. 2 illustrates a kind of LED luminance regulation that the embodiment of the present invention provides
Method flow schematic diagram, as in figure 2 it is shown, the method includes:
Step S2001, obtains the object brightness of LED；
Step S2002, when the present intensity determining object brightness and LED is inconsistent, according to object brightness, determines the
One brightness and the second brightness；
Step S2003, is voltage corresponding to the first brightness by the Voltage Cortrol of LED；And the dutycycle of LED is adjusted to
The PWM duty cycle that two brightness are corresponding, so that the brightness of LED accounts at the PWM that voltage corresponding to the first brightness and the second brightness are corresponding
The effect of empty ratio is issued to object brightness.
Alternatively, when object brightness is consistent with the present intensity of LED, no longer LED luminance is adjusted.
So, on the one hand, in compared to existing technology by the way of the brightness of individually voltage-regulation LED of regulation LED, originally
Additionally using the regulative mode of PWM duty cycle in inventive embodiments, therefore the embodiment of the present invention can be accelerated the brightness of LED and reaches
The time of object brightness；On the other hand, compared to existing technology in the independent PWM duty cycle of regulation LED mode in, the electricity of LED
Pressure is always maintained at maximum, immutable, in the embodiment of the present invention while using PWM duty cycle to be adjusted, the most right
The voltage of LED is adjusted, and the voltage of LED therefore can be made always need not to maintain maximum, thus reduce LED luminance condition
Power consumption, it is achieved thereby that regulate LED luminance time power consumption and the duration of brightness flop process between balance, both ensured merit
Consumption will not be excessive, also ensures that the duration of LED luminance change procedure will not be long.
In specific embodiment, the object brightness of LED is relevant with the first brightness and the second brightness, physical relationship and the electricity of LED
Line structure is correlated with, and there is certain functional relationship, as shown in following formula (1):
LAlways=h (L1,L2) ... ... formula (1)
In formula (1), L1It is the first brightness, L2It is the second brightness；LAlwaysFor object brightness；LAlwaysWith L1And L2Between letter
Number relation is h (L1,L2)。
It is embodied as L in above-mentioned formula (1)AlwaysWith L1And L2Between function have multiple, such as LAlwaysFor L1And L2Sum
Etc..The embodiment of the present invention provides a kind of possible L in above-mentioned formula (1)AlwaysWith L1And L2Between functional relationship, as
Shown in following formula (2):
In formula (2): L1It is the first brightness；L2It is the second brightness；LAlwaysFor object brightness；* represent and take advantage of.
In the embodiment of the present invention, it is alternatively possible to according to concrete operating mode, arrange L in above-mentioned formula (2) in circuit1
And L2Proportionate relationship, as shown in following formula (3):
L1=kL2... ... formula (3)
In formula (3): k is proportionality coefficient, relevant with circuit structure, predeterminable；L1It is the first brightness；L2It is second bright
Degree；LAlwaysFor object brightness.
In conjunction with above-mentioned formula, the workflow of LED luminance adjusting means it is described in detail below:
First obtain the object brightness of LED.This object brightness can be manually set, it is possible to arranges certain condition in advance, according to
Condition automatically generates etc..Owing to LED can be by voltage and the joint effect of PWM duty cycle, therefore, can be according to above-mentioned formula
And formula (3) determines the first brightness L (2)1With the second brightness L2.Using voltage control method is first by the Voltage Cortrol of LED
The voltage that brightness is corresponding.Employing PWM duty cycle control method adjustment PWM duty cycle is the PWM duty that the second brightness is corresponding simultaneously
Ratio.Through certain duration, LED is in the common effect of PWM duty cycle corresponding to voltage corresponding to the first brightness and the second brightness
It is issued to object brightness.
Giving an example, such as object brightness is 400nit (nit), the most finally wishes that the brightness of LED reaches 400nit, root
The first brightness determined according to above-mentioned formula (1) and formula (2) is 200nit, and the second brightness is 800nit.For another example, first is bright
Voltage corresponding for degree 200nit is 3mv (millivolt)；Second brightness be PWM duty cycle corresponding for 800nit be 80%.It is to say,
In the circuit of current LED, if not having the adjusting means of PWM, i.e. PWM duty cycle is 100%, when the voltage of LED it is now
During 3mv, the brightness of LED is the first brightness 200nit.Similarly, in the circuit of current LED, if not having voltage-regulation to fill
Put, i.e. the voltage of LED maintains maximum, such as 5mv always, and now when the dutycycle of LED, the brightness of LED is second bright
Degree is 800nit.When in current LED circuit, it is 3mv by the Voltage Cortrol of LED simultaneously, the PWM duty cycle of LED is adjusted
Being 80%, under the influence of now LED is while voltage and PWM duty cycle, the brightness of LED reaches 400nit.
In the embodiment of the present invention, when the present intensity of object brightness Yu LED is inconsistent, there are two kinds of situations:
Situation one, when object brightness is more than the present intensity of LED, the first brightness is less than object brightness, and object brightness is little
In the second brightness.It is to say, when the object brightness obtained is more than the present intensity of LED, need to regulate the present intensity of LED
It is allowed to be increased to object brightness, by the voltage that the voltage of adjustment LED to the first brightness is corresponding, adjusts the PWM duty of LED simultaneously
Than to PWM duty cycle corresponding to the second brightness, so that the brightness of LED is corresponding at voltage corresponding to the first brightness and the second brightness
The common effect of PWM duty cycle is issued to object brightness.Owing to the brightness flop duration using voltage control method LED is longer,
Therefore make the first brightness less than object brightness, in order to shorten the brightness flop duration of LED under voltage control method.Again owing to using
The brightness flop duration of PWM duty cycle control method LED is shorter, therefore can make the second brightness more than object brightness, so, can
The time of object brightness it is changed to lifting LED luminance.
Fig. 2 a illustrates brightness and the time history of a kind of LED, as shown in Figure 2 a, by the brightness of LED
From present intensity L0It is increased to object brightness LAlways。
As shown in Figure 2 a, curve S2101 represents: in the case of PWM duty cycle is 100%, and the voltage of LED is adjusted to first
Brightness L1The brightness flop situation of corresponding voltage LED, the brightness of the LED shown in curve S2101 is at elapsed time T2Reach afterwards
Brightness L is i.e. reached to steady statue1.It is to say, the brightness of LED reaches steady statue refers to growth over time, curve
Brightness represented by S2301 will not change again.
As shown in Figure 2 a, curve S2102 represents: PWM duty cycle, when maximum, is adjusted to the second brightness by the voltage of LED
L2The brightness flop situation of the LED of corresponding PWM duty cycle, the brightness of the LED shown in curve S2102 is at elapsed time T1It
After reach steady statue and i.e. reach brightness L2。
As shown in Figure 2 a, curve S2103 represents: the voltage of LED is adjusted to the first brightness L from current voltage1Corresponding electricity
Pressure, the PWM duty cycle of LED is adjusted to the second brightness L2The brightness flop situation of the LED of corresponding PWM duty cycle, in curve S2103
The brightness of shown LED is at elapsed time T2Reach steady statue afterwards and i.e. reach luma target brightness LAlways。
By Fig. 2 a it can be seen that under the co-controlling of voltage and PWM duty cycle, LED elapsed time T2I.e. can reach
Object brightness.If but use merely voltage control method, then need to make LED from present intensity L by voltage control method0
It is increased to object brightness LAlways, and in the embodiment of the present invention, the voltage of LED only needs to rise a height of first brightness correspondence from current voltage
Voltage, and voltage corresponding to the first brightness is less than object brightness, therefore, the Voltage Cortrol of LED in the embodiment of the present invention
Duration is necessarily smaller than in prior art the Voltage Cortrol duration of LED when using merely voltage-controlled method, it is seen then that the present invention
The method that embodiment is provided shortens LED luminance and is changed to the duration of object brightness.
Further, if by Fig. 2 a it can be seen that use merely PWM duty cycle control method, then needing to keep LED's
Voltage maintains maximum always, and under this kind of mode, during the brightness regulation of LED, power consumption is relatively big, but, the embodiment of the present invention
In, while regulation PWM duty cycle, the voltage that also have adjusted the voltage of LED, i.e. LED will not maintain maximum always,
The voltage of LED maintains at the voltage that the first brightness is corresponding, and the voltage of LED is the least, and the power consumption of LED is the least.Therefore this
The method that bright embodiment is provided during the brightness regulation of LED, compared to existing technology in simple use PWM duty cycle to control
Method, reduces power consumption.
Situation two, when object brightness is less than the present intensity of LED, the first brightness is more than object brightness, and object brightness is big
In the second brightness.It is to say, when the object brightness obtained is less than the present intensity of LED, need to regulate the present intensity of LED
It is allowed to be reduced to object brightness, by the voltage that the voltage of adjustment LED to the first brightness is corresponding, adjusts the PWM duty of LED simultaneously
Than to PWM duty cycle corresponding to the second brightness, so that the brightness of LED is corresponding at voltage corresponding to the first brightness and the second brightness
It is reduced to object brightness under the common effect of PWM duty cycle.Owing to using the brightness flop duration of voltage control method LED relatively
Long, therefore make the first brightness more than object brightness, in order to shorten the brightness flop duration of LED under voltage control method.Again due to
The brightness flop duration using PWM duty cycle control method LED is shorter, and object brightness therefore can be made to be more than the second brightness, as
This, can promote LED luminance and be changed to the time of object brightness.
Under the co-controlling of voltage and PWM duty cycle, LED can be reduced to object brightness through certain time.But
If using merely voltage control method, then need to make LED be reduced to object brightness from present intensity by voltage control method,
And in the embodiment of the present invention, the voltage of LED only needs to be reduced to, from current voltage, the voltage that the first brightness is corresponding, and first
Voltage corresponding to brightness is more than object brightness, and therefore, in the embodiment of the present invention, the Voltage Cortrol duration of LED is necessarily smaller than existing skill
The Voltage Cortrol duration of simple LED when using voltage-controlled method in art, it is seen then that the method that the embodiment of the present invention is provided
Shorten LED luminance and be changed to the duration of object brightness.
Further, if using merely PWM duty cycle control method, then need the voltage keeping LED to maintain the most always
Big value, under this kind of mode, during the brightness regulation of LED, power consumption is relatively big, but, in the embodiment of the present invention, at regulation PWM duty
While Bi, the voltage that also have adjusted the voltage of LED, i.e. LED will not maintain maximum always, and the voltage of LED maintains
At the voltage that one brightness is corresponding, the voltage of LED is the least, and the power consumption of LED is the least.Therefore the side that the embodiment of the present invention is provided
Method during the brightness regulation of LED, compared to existing technology in simple use PWM duty cycle control method, reduce power consumption.
Optionally, the dutycycle of LED is adjusted to the PWM duty cycle that the second brightness is corresponding, comprises determining that the 3rd brightness；
And the dutycycle of LED is adjusted to the PWM duty cycle that the 3rd brightness is corresponding, and maintain the target duration preset；Through presetting
Target duration time, the dutycycle of LED is adjusted to the PWM duty cycle that the second brightness is corresponding.
Alternatively, when object brightness is more than the present intensity of LED, the 3rd brightness is more than the second brightness.Such as, by LED's
Brightness is adjusted to 400nit from 200nit, sets the second brightness as 420nit, then the 3rd brightness is more than 420nit.
In the embodiment of the present invention, by the brightness of LED from present intensity L0It is reduced to object brightness LAlways, Fig. 2 b illustrates
A kind of curve chart of LED luminance alternatively regulation, as shown in Figure 2 b:
As shown in Figure 2 b, curve S2201 represents: in the case of PWM duty cycle is 100%, and the voltage of LED is adjusted to first
Brightness L1The brightness flop situation of corresponding voltage LED, the brightness of the LED shown in curve S2201 is at elapsed time T4Reach afterwards
Brightness L is i.e. reached to steady statue1。
As shown in Figure 2 b, curve S2202 represents: PWM duty cycle, when maximum, is first adjusted to the 3rd by the voltage of LED
Brightness L3Corresponding PWM duty cycle PWM1, elapsed time T afterwards3, then PWM duty cycle is adjusted to the second brightness L2Corresponding
PWM duty cycle PWM2The brightness flop situation of LED.3rd brightness is less than the second brightness, therefore the 3rd brightness L3Corresponding PWM
Dutycycle PWM1Less than the second brightness L2Corresponding PWM duty cycle PWM2。
As shown in Figure 2 b, curve 2203 represents: the voltage of LED is adjusted to the first brightness L from current voltage1Corresponding electricity
Pressure, the PWM duty cycle of LED first adjusts to the 3rd brightness L3Corresponding PWM duty cycle PWM1, adjust afterwards to the second brightness L2Right
The PWM duty cycle PWM answered2The brightness flop situation of LED, the brightness of the LED shown in curve S2103 is at elapsed time T3It
After reach steady statue and i.e. reach luma target brightness LAlways.After moment T3, the LED's under the Control of Voltage of LED is bright
Degree is still within downward trend, but the PWM duty cycle of LED is the PWM duty cycle that the second brightness is corresponding, at this PWM duty cycle
The brightness controlling lower LED already at ascendant trend, therefore under the Control of Voltage of LED with under the control of PWM duty cycle,
At time T3Afterwards, the brightness of LED maintains object brightness.
It can be seen that by the control method of PWM duty cycle from Fig. 2 b, adjust PWM duty cycle to the 3rd brightness L3Right
The PWM duty cycle PWM answered1, regulation voltage is the first brightness L simultaneously1Corresponding voltage, LED is at the 3rd brightness L3Corresponding PWM
Dutycycle PWM1With the first brightness L1Under the common effect of corresponding voltage, LED is from present intensity L0Target can be reduced rapidly to
Brightness LAlways.The time a length of default target duration used.Owing to first PWM duty cycle being adjusted to smaller value, now account at PWM
Under the influence of empty ratio, the brightness of LED can decline rapidly.The visible program further shorten LED luminance and is changed to object brightness
Duration.
Alternatively, when object brightness is less than the present intensity of LED, the 3rd brightness is less than the second brightness.Such as bright by LED
Degree is adjusted to 450nit from 500nit, sets the second brightness as 420nit, then the 3rd brightness is less than 420nit.
In the embodiment of the present invention, by the brightness of LED from present intensity L0It is increased to object brightness LAlways, Fig. 2 c illustrates
A kind of curve chart of LED luminance alternatively regulation, as shown in Figure 2 c:
As shown in Figure 2 c, curve S2301 represents: in the case of PWM duty cycle is 100%, and the voltage of LED is adjusted to first
Brightness L1The brightness flop situation of corresponding voltage LED, the brightness of the LED shown in curve S2301 is at elapsed time T4Reach afterwards
Brightness L is i.e. reached to steady statue1。
As shown in Figure 2 c, curve S2302 represents: PWM duty cycle, when maximum, is first adjusted to the 3rd by the voltage of LED
Brightness L3Corresponding PWM duty cycle PWM1, elapsed time T afterwards3, then PWM duty cycle is adjusted to the second brightness L2Corresponding
PWM duty cycle PWM2The brightness flop situation of LED.3rd brightness is more than the second brightness, therefore the 3rd brightness L3Corresponding PWM
Dutycycle PWM1More than the second brightness L2Corresponding PWM duty cycle PWM2。
As shown in Figure 2 c, curve 2303 represents: the voltage of LED is adjusted to the first brightness L from current voltage1Corresponding electricity
Pressure, the PWM duty cycle of LED first adjusts to the 3rd brightness L3Corresponding PWM duty cycle PWM1, adjust afterwards to the second brightness L2Right
The PWM duty cycle PWM answered2The brightness flop situation of LED, the brightness of the LED shown in curve S2103 is at elapsed time T3It
After reach steady statue and i.e. reach luma target brightness LAlways.After moment T3, the LED's under the Control of Voltage of LED is bright
Degree is still within ascendant trend, but the PWM duty cycle of LED is the PWM duty cycle that the second brightness is corresponding, at this PWM duty cycle
The brightness controlling lower LED already at downward trend, therefore under the Control of Voltage of LED with under the control of PWM duty cycle,
At time T3Afterwards, the brightness of LED maintains object brightness.
It can be seen that by the control method of PWM duty cycle from Fig. 2 c, adjust PWM duty cycle to the 3rd brightness L3Right
The PWM duty cycle PWM answered1, regulation voltage is the first brightness L simultaneously1Corresponding voltage, LED is at the 3rd brightness L3Corresponding PWM
Dutycycle PWM1With the first brightness L1Under the common effect of corresponding voltage, LED is from present intensity L0Can quickly be increased to target
Brightness LAlways.The time a length of default target duration used.Owing to first PWM duty cycle being adjusted to higher value, now account at PWM
Under the influence of empty ratio, the brightness of LED can promote rapidly.From the point of view of accompanying drawing, comparing in Fig. 2 a, in Fig. 2 c, the brightness of LED is from working as
Front brightness L0It is increased to object brightness LAlwaysDuration less than the brightness of LED in Fig. 2 a from present intensity L0It is increased to object brightness LAlways
Duration, it is seen that the program further shorten LED luminance and is changed to the duration of object brightness.
Alternatively, as shown in Figure 2 c, elapsed time T3Time, if no longer PWM duty cycle is adjusted, i.e. maintain LED
PWM duty cycle be dutycycle corresponding to the 3rd brightness, then the brightness represented by curve S2302 is at time T3Time still maintain
In the 3rd brightness, say, that LED is elapsed time T when PWM duty cycle is dutycycle corresponding to the 3rd brightness3Reach stable
Brightness.
For example, the brightness adjusting LED is increased to 400nit from 0, and the 3rd brightness is 500nit, and the second brightness is
420nit, PWM duty cycle is 70% through 4ms, and LED luminance reaches the 3rd brightness 500nit.The most first regulate PWM duty cycle
To 70%, through time a length of 4ms, brightness reaches 500nit, if it is 70% constant for still keeping PWM duty, then the brightness of LED
Prolongation over time will not change, and maintains 500nit.
Alternatively, in the embodiment of the present invention, the dutycycle of LED is adjusted to the PWM duty cycle that the 3rd brightness is corresponding, and ties up
Hold default target duration；At the target duration through presetting, the dutycycle of LED is adjusted to the PWM that the second brightness is corresponding
Dutycycle.And the brightness of LED is reaching object brightness after target duration.Optionally, target duration meets following condition:
Be voltage corresponding to the first brightness by the Voltage Cortrol of LED, the dutycycle of LED is adjusted to simultaneously the 3rd brightness corresponding
PWM duty cycle, and when maintaining target duration: LED luminance reaches object brightness.
The embodiment of the present invention combines Fig. 2 c and illustrates target duration, as shown in Figure 2 c: during target in a length of Fig. 2 c from
Time 0 starts to time T3The duration of cut-off, the condition that target duration meets is: the voltage adjusting LED is corresponding to the first brightness
Voltage while, start to adjust PWM duty cycle to PWM duty cycle corresponding to the 3rd brightness, through target duration, PWM duty
The brightness more corresponding than control method reaches the 3rd brightness L shown in curve S23023, the now brightness of LED reaches object brightness
LAlways.It is to say, use voltage control method and Duty ratio control method regulation LED from present intensity L simultaneously0To object brightness
LAlwaysRequired duration is target duration, now continues to extend duration, and the brightness of LED is continually maintained in object brightness.This
The method of the regulation LED luminance that bright embodiment provides, relative to the voltage-controlled method of simple use in prior art, shortens
LED luminance is changed to the duration of object brightness, and the simple PWM duty cycle control method that uses, reduction relative in prior art
Power consumption.
Optionally, target duration is less than: after being voltage corresponding to the first brightness by the Voltage Cortrol of LED, LED is bright first
The voltage that degree is corresponding is issued to the duration of steady statue.For Fig. 2 c, during target the time 0 in a length of Fig. 2 c start to time
Between T3The duration of cut-off, after being voltage corresponding to the first brightness by the Voltage Cortrol of LED, LED is at voltage corresponding to the first brightness
Be issued to steady statue time a length of start to time T for the time 0 in Fig. 2 c4The duration of cut-off.Visible, the time 0 start to
Time T3The duration of cut-off started to time T more than the time 04The duration of cut-off.Owing to target duration is adjusted less than by the voltage of LED
Whole is the duration that LED is issued to steady statue at the voltage that the first brightness is corresponding after voltage corresponding to the first brightness, therefore, enters one
Step improves the brightness flop duration of LED, and then has saved the time.
Alternatively, target duration is equal to: is voltage corresponding to the first brightness by the Voltage Cortrol of LED and reaches steady statue
The half of duration.For Fig. 2 c, during target, the time 0 in a length of Fig. 2 c starts to time T3The duration of cut-off, by LED
Voltage Cortrol be voltage corresponding to the first brightness after, LED is issued to the duration of steady statue at the voltage that the first brightness is corresponding
For starting to time T for the time 0 in Fig. 2 c4The duration of cut-off.Alternatively, the time 0 starts to time T3Cut-off time a length of time
Between 0 start to time T4The half of the duration of cut-off.And due to through target duration, by PWM duty cycle from the 3rd brightness
Corresponding PWM duty cycle is adjusted to the PWM duty cycle that the second brightness is corresponding, and therefore, on the one hand this kind of scheme improve the bright of LED
Degree change duration, and then saved the time；On the other hand, be more reasonably assigned with PWM duty cycle corresponding to the 3rd brightness and
The time distribution of the PWM duty cycle that the second brightness is corresponding.In this kind of scheme, the 3rd brightness can be described as overcharging a little.
Analyze embodiment of the present invention advantage in terms of energy consumption in detail below.
In specific embodiment, during the brightness of regulation LED, the brightness of LED and the ratio of power reflect the luminescence of LED
Efficiency, the least explanation LED is more energy efficient for luminous efficiency, and the brightness L of LED, power P and luminous efficiency η three meet certain relation,
As shown in following formula (4):
Above-mentioned formula (4) illustrates that, under identical brightness case, the LED that power is the least is more energy efficient.
Because the characteristic of LED light source component, regulate the brightness of multiple LED in the case of the most identical object brightness, voltage control
Under method processed, the power corresponding to LED can be lower than the power corresponding to PWM duty cycle control method LED, so regulating multiple LED
Brightness to the most identical object brightness time, voltage control method is higher than the luminous efficiency of PWM duty cycle control method, namely
Saying, voltage control method is more more energy efficient than PWM duty cycle control method.
Fig. 2 d illustrates brightness and the power relation schematic diagram of a kind of LED that the embodiment of the present invention provides.Such as figure
Shown in 2d, by LED luminance from L0It is adjusted to L1Three curves of process: curve S2401, curve S2402, curve S2403, its
In, L1More than L0。
As shown in Figure 2 d, curve S2401 represents: in the case of PWM duty cycle is 100%, only regulates the voltage of LED,
Make LED luminance from L0It is adjusted to L1, power raises along with the rising of brightness.In this kind of scheme, brightness and power exist certain
Functional relationship, as shown in following formula (5):
L1=f (P1)*g(Pmax) ... ... formula (5)
Wherein, L1Brightness for LED；P1For L1The power of corresponding LED；PmaxFor LED rated power；L1And P1Between
Functional relationship is f (P1)；L1And PmaxBetween functional relationship be g (Pmax)。
Curve S2402 represents: the voltage of LED is when maximum, and the PWM duty cycle of regulation LED makes LED luminance from L0Adjust
Joint arrives L2, power raises along with the rising of brightness.In this kind of scheme, shown in the most following formula of the relation (6) of brightness and power:
L2=f (Pmax)*g(P2) ... ... formula (6)；
Wherein, L2The brightness of LED；P2For L2The power of corresponding LED；PmaxFor LED rated power；L2And PmaxBetween
Functional relationship is f (Pmax)；L2And P2Between functional relationship be g (P2)。
Curve S2403 represents: adjust voltage and the PWM duty cycle of LED so that LED luminance is from L simultaneously0It is adjusted to LAlways, bright
The relation of degree and power meets formula (2)；By L in formula (5) and formula (6)1And L2Substitute into formula (2), can obtain formula (7):
At multiple LED under identical brightness case, i.e. L in formula (5)1, L in formula (6)2With in formula (7)
LAlwaysThe while of homogeneous, power P1Less than PAlways, PAlwaysLess than P2, understanding according to formula (4), luminous efficiency meets following equation (8):
η2≤ηAlways≤η1... ... formula (8)
In formula (8), η1Under conditions of being 100% for PWM duty cycle in prior art, individually use and adjust voltage method
LED is made to reach luminous efficiency corresponding during object brightness, η2For prior art maintaining the voltage of LED be in the feelings of maximum
Under condition, individually use and adjust PWM duty cycle method and make LED reach luminous efficiency corresponding during object brightness, ηAlwaysReal for the present invention
Execute example uses simultaneously and adjust voltage simultaneously and make with PWM duty cycle method LED reach luminous efficiency corresponding during object brightness.Logical
Cross formula (8) and above-mentioned analysis, it is clear that the embodiment of the present invention is simple by adjusting relative in prior art
The mode of PWM duty cycle adjusts the mode of the brightness of LED, saves energy consumption.
Can be seen that owing to using voltage and the method for dutycycle of adjusting simultaneously in the embodiment of the present invention from the discussion above, one
Aspect, adjusts the brightness of LED and reaches time required for object brightness less than individually using the time adjusted required for voltage, make
LED luminance reacting condition must be regulated rapider；On the other hand, the power dissipation ratio of this method regulation LED luminance individually uses and accounts for
The power consumption of empty ratio method regulation is less；The inventive method achieves power consumption and brightness flop process when regulating LED luminance
Balance between duration, had both ensured that power consumption will not be excessive, also ensured that the duration of LED luminance change procedure will not be long.
Fig. 3 illustrates the structural representation of a kind of LED luminance adjusting means that the embodiment of the present invention provides.
Based on same idea, a kind of LED luminance adjusting means that the embodiment of the present invention provides, as it is shown on figure 3, this device
300 include acquiring unit 301, determine unit 302 and adjustment unit 303；Wherein:
Acquiring unit 301, for obtaining the object brightness of LED；
Determine unit 302, for when determining that object brightness is inconsistent with the present intensity of LED, according to object brightness, really
Make the first brightness and the second brightness；
Adjustment unit 303, for being voltage corresponding to the first brightness by the Voltage Cortrol of LED, and adjusts the dutycycle of LED
Whole is PWM duty cycle corresponding to the second brightness, so that the brightness of LED is corresponding at voltage corresponding to the first brightness and the second brightness
The effect of PWM duty cycle is issued to object brightness.
Alternatively, when object brightness is more than the present intensity of LED, the first brightness is less than object brightness, and object brightness is little
In the second brightness；
When object brightness is less than the present intensity of LED, the first brightness is more than object brightness, and object brightness is bright more than second
Degree.
Optionally it is determined that unit 302, it is additionally operable to:
Determine the 3rd brightness；Wherein, when object brightness is more than the present intensity of LED, the 3rd brightness is more than the second brightness；Mesh
When mark brightness is less than the present intensity of LED, the 3rd brightness is less than the second brightness；
Adjustment unit 303, when the dutycycle of LED is adjusted to PWM duty cycle corresponding to the second brightness, is used for:
The dutycycle of LED is adjusted to the PWM duty cycle that the 3rd brightness is corresponding, and maintains the target duration preset；
At the target duration through presetting, the dutycycle of LED is adjusted to the PWM duty cycle that the second brightness is corresponding.
Alternatively, target duration meets following condition:
It is voltage corresponding to the first brightness by the Voltage Cortrol of LED, the dutycycle of LED is adjusted to the 3rd brightness simultaneously
Corresponding PWM duty cycle, and when maintaining target duration:
LED luminance reaches object brightness.
Alternatively, target duration is less than: after being voltage corresponding to the first brightness by the Voltage Cortrol of LED, LED is bright first
The voltage that degree is corresponding is issued to the duration of steady statue；Or
Target duration is equal to: after being voltage corresponding to the first brightness by the Voltage Cortrol of LED, and LED is corresponding in the first brightness
Voltage be issued to the half of duration of steady statue.
Can be seen that in the embodiment of the present invention object brightness obtaining LED from the discussion above；Determining object brightness and LED
Present intensity inconsistent time, according to object brightness, determine the first brightness and the second brightness；It is by the Voltage Cortrol of LED
The voltage that one brightness is corresponding, and the dutycycle of LED is adjusted to the PWM duty cycle that the second brightness is corresponding, so that the brightness of LED exists
The effect of voltage that the first brightness is corresponding and PWM duty cycle corresponding to the second brightness is issued to object brightness.Owing to using simultaneously
Adjust voltage and the method for dutycycle, on the one hand, the time required for the brightness of LED reaches object brightness that adjusts is less than individually adopting
With the time adjusted required for voltage so that regulation LED luminance reacting condition is rapider；On the other hand, this method regulation
The power consumption that the power dissipation ratio of LED luminance individually uses dutycycle method to regulate is less；The inventive method achieves at regulation LED bright
Balance between the duration of power consumption and brightness flop process when spending, had both ensured that power consumption will not be excessive, had also ensured that LED luminance changed
The duration of journey will not be long.
Those skilled in the art are it should be appreciated that embodiments of the invention can be provided as method or computer program.
Therefore, the embodiment in terms of the present invention can use complete hardware embodiment, complete software implementation or combine software and hardware
Form.And, the present invention can use can be with depositing at one or more computers wherein including computer usable program code
The shape of the upper computer program implemented of storage media (including but not limited to disk memory, CD-ROM, optical memory etc.)
Formula.
The present invention is with reference to method, equipment (system) and the flow process of computer program according to embodiments of the present invention
Figure and/or block diagram describe.It should be understood that can the most first-class by computer program instructions flowchart and/or block diagram
Flow process in journey and/or square frame and flow chart and/or block diagram and/or the combination of square frame.These computer programs can be provided
Instruction arrives the processor of general purpose computer, special-purpose computer, Embedded Processor or other programmable data processing device to produce
A raw machine so that the instruction performed by the processor of computer or other programmable data processing device is produced for real
The device of the function specified in one flow process of flow chart or multiple flow process and/or one square frame of block diagram or multiple square frame now.
These computer program instructions may be alternatively stored in and computer or other programmable data processing device can be guided with spy
Determine in the computer-readable memory that mode works so that the instruction being stored in this computer-readable memory produces and includes referring to
Make the manufacture of device, this command device realize at one flow process of flow chart or multiple flow process and/or one square frame of block diagram or
The function specified in multiple square frames.
These computer program instructions also can be loaded in computer or other programmable data processing device so that at meter
Perform sequence of operations step on calculation machine or other programmable devices to produce computer implemented process, thus at computer or
The instruction performed on other programmable devices provides for realizing at one flow process of flow chart or multiple flow process and/or block diagram one
The step of the function specified in individual square frame or multiple square frame.
Although preferred embodiments of the present invention have been described, but those skilled in the art once know basic creation
Property concept, then can make other change and amendment to these embodiments.So, claims are intended to be construed to include excellent
Select embodiment and fall into all changes and the amendment of the scope of the invention.
Obviously, those skilled in the art can carry out various change and the modification model without deviating from the present invention to the present invention
Enclose.So, if these amendments of the present invention and modification belong within the scope of the claims in the present invention and equivalent technologies thereof, then
The present invention is also intended to comprise these and changes and modification.
Claims (10)
1. a LED brightness adjusting method, it is characterised in that including:
Obtain the object brightness of LED；
When determining that described object brightness is inconsistent with the present intensity of described LED, according to described object brightness, determine first
Brightness and the second brightness；
It is voltage corresponding to described first brightness by the Voltage Cortrol of described LED, and it is described that the dutycycle of described LED is adjusted to
The PWM duty cycle that second brightness is corresponding, so that the brightness of described LED is at voltage corresponding to described first brightness and described second bright
The effect of the PWM duty cycle that degree is corresponding is issued to described object brightness.
2. the method for claim 1, it is characterised in that when described object brightness is more than the present intensity of described LED, institute
State the first brightness and be less than described object brightness, and described object brightness is less than described second brightness；
When described object brightness is less than the present intensity of described LED, described first brightness is more than described object brightness, and described mesh
Mark brightness is more than described second brightness.
3. the method for claim 1, it is characterised in that the described dutycycle by described LED is adjusted to described second bright
The PWM duty cycle that degree is corresponding, including:
Determine the 3rd brightness；Wherein, when described object brightness is more than the present intensity of described LED, described 3rd brightness is more than institute
State the second brightness；When described object brightness is less than the present intensity of described LED, described 3rd brightness is less than described second brightness；
The dutycycle of described LED is adjusted to the PWM duty cycle that described 3rd brightness is corresponding, and maintains the target duration preset；
At the target duration through presetting, the dutycycle of described LED is adjusted to the PWM duty that described second brightness is corresponding
Ratio.
4. method as claimed in claim 3, it is characterised in that described target duration meets following condition:
It is voltage corresponding to described first brightness by the Voltage Cortrol of described LED, the dutycycle of described LED is adjusted to institute simultaneously
The PWM duty cycle that 3rd brightness is corresponding, and when maintaining described target duration:
Described LED luminance reaches described object brightness.
5. method as claimed in claim 3, it is characterised in that described target duration is less than: by the Voltage Cortrol of described LED be
After the voltage that described first brightness is corresponding, described LED is issued to the duration of steady statue at the voltage that the first brightness is corresponding；Or
Described target duration is equal to: after being voltage corresponding to described first brightness by the Voltage Cortrol of described LED, described LED exists
Voltage corresponding to the first brightness is issued to the half of the duration of steady statue.
6. a LED brightness regulating apparatus, it is characterised in that including:
Acquiring unit, for obtaining the object brightness of LED；
Determine unit, for when determining that described object brightness is inconsistent with the present intensity of described LED, bright according to described target
Degree, determines the first brightness and the second brightness；
Adjustment unit, for being voltage corresponding to described first brightness by the Voltage Cortrol of described LED, and accounting for described LED
The empty PWM duty cycle that described second brightness is corresponding than being adjusted to, so that the brightness of described LED is at electricity corresponding to described first brightness
The effect pressing the PWM duty cycle corresponding with described second brightness is issued to described object brightness.
7. device as claimed in claim 6, it is characterised in that when described object brightness is more than the present intensity of described LED, institute
State the first brightness and be less than described object brightness, and described object brightness is less than described second brightness；
When described object brightness is less than the present intensity of described LED, described first brightness is more than described object brightness, and described mesh
Mark brightness is more than described second brightness.
8. device as claimed in claim 6, it is characterised in that described determine unit, is additionally operable to:
Determine the 3rd brightness；Wherein, when described object brightness is more than the present intensity of described LED, described 3rd brightness is more than institute
State the second brightness；When described object brightness is less than the present intensity of described LED, described 3rd brightness is less than described second brightness；
Described adjustment unit, when the dutycycle of described LED is adjusted to PWM duty cycle corresponding to described second brightness, is used for:
The dutycycle of described LED is adjusted to the PWM duty cycle that described 3rd brightness is corresponding, and maintains the target duration preset；
At the target duration through presetting, the dutycycle of described LED is adjusted to the PWM duty that described second brightness is corresponding
Ratio.
9. device as claimed in claim 8, it is characterised in that described target duration meets following condition:
It is voltage corresponding to described first brightness by the Voltage Cortrol of described LED, the dutycycle of described LED is adjusted to institute simultaneously
The PWM duty cycle that 3rd brightness is corresponding, and when maintaining described target duration:
Described LED luminance reaches described object brightness.
10. device as claimed in claim 8, it is characterised in that described target duration is less than: by the Voltage Cortrol of described LED
For after the voltage that described first brightness is corresponding, described LED is issued to the duration of steady statue at the voltage that the first brightness is corresponding；Or
Person
Described target duration is equal to: after being voltage corresponding to described first brightness by the Voltage Cortrol of described LED, described LED exists
Voltage corresponding to the first brightness is issued to the half of the duration of steady statue.
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