CN104735848B - Light-emitting module and driving method thereof - Google Patents
Light-emitting module and driving method thereof Download PDFInfo
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Abstract
The invention discloses a light-emitting module and a driving method thereof. The method comprises the steps that a target group composed of P light-emitting elements corresponding to different light-emitting spectrums is arranged, and each light-emitting element corresponds to N power parameters at N sub-frequency bands; according to a target spectrum and N*P power parameters of the P light-emitting elements in the target group, P estimation current values corresponding to the P light-emitting elements in the target group are worked out, and the target spectrum corresponds to N target spectrum values at the N sub-frequency bands; light-emitting spectrum errors are calculated according to the target spectrum, the N*P power parameters corresponding to the target group and the P estimation current values; whether the light-emitting spectrum errors conform to the judgment criteria or not is judged so as to selectively set P estimation current values as the driving current values corresponding to the P light-emitting elements.
Description
Technical field
The present invention relates to a kind of light emitting module and its driving method, more particularly to one kind is with numerical calculations driving current
Light emitting module and its driving method.
Background technology
It has been a very usual thing to be illuminated with light emitting module, in recent years with light emitting diode or other are efficient
The light emitting module of rate light-emitting component composition is increasingly becoming a kind of trend.However, with light emitting diode or other high efficiency light-emitting units
Part has that specific to send out light emitting module spectral be not an easy thing making one.Common design is to set
Meter person is arranged in pairs or groups simulation softward with manpower, via trial and error pricing through multiple trial obtaining the luminous frequency spectrum of an acceptable.
This causes the design spacious day of the light emitting module with non-common luminescent frequency spectrum time-consuming.Simultaneously as light emitting diode or other height
Efficiency light emission element has the phenomenon of light decay after a long time use, so that the light sent by old light emitting module is not
Only more dim, its luminous frequency spectrum more differs a lot of with the luminous frequency spectrum for designing originally.
Accordingly, it would be desirable to one can automatically according in target spectrum (the luminous frequency spectrum for designing originally) and light emitting module each
The luminous frequency spectrum of light-emitting component come the method that calculates the driving current of each light-emitting component, and the method must be able to be implemented in it is existing
On some light emitting modules.
The content of the invention
Problem in view of more than, it is an object of the invention to a kind of driving method of light emitting module is proposed, according to target
The luminous frequency spectrum of frequency spectrum and multiple light-emitting components, calculates the multiple driving currents corresponding to multiple light-emitting components so that many
The luminous frequency spectrum gone out combined by individual light-emitting component is close to target spectrum.
The driving method of a kind of light emitting module of the foundation present invention, comprising setting to there is difference to send out spectral P
Optical element constitutes a target group, and each light-emitting component is respectively at N number of frequency sub-band to there is N number of power parameter.According to mesh
N × P power parameter of P light-emitting component in mark frequency spectrum and target group, calculates and sends out corresponding to P in target group
P estimation current value of optical element, target spectrum is in N number of frequency sub-band to there is N number of target spectrum value.According to target spectrum, right
Luminous error of spectrum should be calculated in N × P power parameter of target group and P estimation current value.And, judge that this lights
Whether error of spectrum meets judgment criterion, wherein when this luminous error of spectrum meets this judgment criterion, setting this P and estimating electricity
Flow valuve is P driving current value of aforementioned P light-emitting component, and P and N is positive integer.
Further it is proposed that a kind of light emitting module, using aforementioned driving method, can be according to target spectrum and multiple
The luminous frequency spectrum of light-emitting component, calculates the multiple driving currents corresponding to multiple light-emitting components so that multiple light-emitting component institutes
The luminous frequency spectrum being combined into is close to target spectrum.
According to a kind of light emitting module of the present invention, comprising constituted to sending out spectral P light-emitting component by difference
Target group and a treatment element.In P light-emitting component each light-emitting component respectively at N number of frequency sub-band to there is N number of power
Parameter.Treatment element, is electrically connected to P light-emitting component, to the N × P power parameter according to P light-emitting component and one
Target spectrum, calculates the P estimation current value corresponding to P light-emitting component, and target spectrum is N number of to having in N number of frequency sub-band
Target spectrum value.Treatment element is again according to target spectrum, the N × P power parameter corresponding to target group and P estimation electric current
Value, calculates luminous error of spectrum, and judges whether luminous error of spectrum meets a judgment criterion.Wherein when luminous error of spectrum
When meeting judgment criterion, set P estimate current value for P light-emitting component P driving current value with drive P it is individual light it is first
Part.
In sum, according to the light emitting module realized of the present invention and its driving method can according to a target spectrum with
And the multiple power parameters corresponding to multiple light-emitting components, the driving current value for driving each light-emitting component is calculated,
So that the corresponding frequency spectrum of the light of mixed generation is close to target spectrum.Additionally, can more dynamically update each luminous unit
The power parameter of part, can thereby make according to the light emitting module of present invention realization not because light decay causes luminous spectrum offset.
Describe the present invention below in conjunction with the drawings and specific embodiments, but it is not as a limitation of the invention.
Description of the drawings
Functional-block diagrams of the Fig. 1 according to the light emitting module of one embodiment of the invention；
The luminous spectrum diagram of a light-emitting component in Fig. 2 one embodiment of the invention；
Flow charts of the Fig. 3 according to the light emitting module driving method of one embodiment of the invention；
Fig. 4 A are the luminous spectrum diagram of light-emitting component 111 in one embodiment of the invention；
Fig. 4 B are the luminous spectrum diagram of light-emitting component 113 in one embodiment of the invention；
Driving method flow charts of the Fig. 5 according to the light emitting module of one embodiment of the invention；
Functional-block diagrams of the Fig. 6 according to the light emitting module of another embodiment of the present invention.
Wherein, reference
1st, 1 ' light emitting module
11 luminescence components
13 treatment elements
15 spectrum analyses elements
17 memory cells
111～119 light-emitting components
Specific embodiment
Hereinafter detailed detailed features and advantage of the narration present invention in embodiments, its content be enough to make any be familiar with
Relevant art understands the technology contents of the present invention and implements according to this, and the content according to disclosed by this specification, claim
Scope and accompanying drawing, it is any to be familiar with the purpose and advantage that relevant art be readily understood upon correlation of the invention.Below example
It is the viewpoint for further describing the present invention, but it is non-anyways limiting scope of the invention.N, P, K in the present invention is equal
To be represented as nonnegative integer.
With regard to the light emitting module of light emitting module driving method in the application present invention, Fig. 1 is refer to, which is according to the present invention one
The functional-block diagram of the light emitting module of embodiment.As shown in figure 1, light emitting module 1 is luminous comprising what is be made up of K light-emitting component
Component 11 and treatment element 13.Wherein K light-emitting component is divided into the target group being made up of P light-emitting component,
And the group to be selected being made up of Z light-emitting component, wherein target group is mutually exclusive with group to be selected.Treatment element 13 with
K light-emitting component in aforementioned luminescence component 11 is electrically connected with.This light emitting module 1 can be right to determine according to a target spectrum
This K light-emitting component should be driven this K can be made to light with this K driving current in K driving current of K light-emitting component
Luminous spectrum distribution corresponding to the light that element sends levels off to preceding aim frequency spectrum.In the following multiple embodiments of the present invention with
9 light-emitting components 111 explain the function mode of this driving method to light-emitting component 119, however the present invention do not limit it is luminous
The quantity of element.
Each light-emitting component in light-emitting component 111 to light-emitting component 119 has specifically luminous frequency spectrum.Citing comes
Say, refer to Fig. 2, the luminous spectrum diagram of a light-emitting component in its one embodiment of the invention.As shown in Fig. 2 light-emitting component
111 luminous frequency spectrum can be divided into N number of frequency sub-band, and each in visible light wave range (light wave is a length of 380 nanometers to 780 nanometers)
Frequency sub-band one power parameter of correspondence.For example, the wave band that frequency sub-band is corresponded to can be 1 nanometer, 10 nanometers or 100
Nanometer, has the width that usual skill can freely design wave band in art, and here is the present invention be not any limitation as.
More particularly, the power parameter corresponding to a frequency sub-band can be interpreted per unit electric current (such as 1 milli
Ampere, 1 micromicroampere or other appropriate unitary current amounts) when flowing through, the light sent by light-emitting component 111 is in this frequency sub-band
Luminous flux.Also, the luminous frequency spectrum of each light-emitting component in light-emitting component 111 to light-emitting component 119 is incomplete same.Lift
For example, in the spectrum corresponding to light-emitting component 111, the luminous flux highest of 420 nanometers of wavelength, relative 119 institute of light-emitting component
In corresponding spectrum, the luminous flux highest of 700 nanometers of wavelength.Therefore, the method disclosed in multiple embodiments of the invention can
With by controlling the driving current of each light-emitting component adjusting luminous flux of each light-emitting component in each frequency sub-band, so as to
Combine multiple light-emitting components to obtain being similar to the light flux distribution of target spectrum.When the light flux distribution that each frequency sub-band is corresponded to
When approximate with target spectrum, represent that the luminous frequency spectrum that the light combinations issued by this multiple light-emitting component are obtained is similar to target
Frequency spectrum.According to an embodiment, light-emitting component can be light emitting diode, Organic Light Emitting Diode or other can send can
See the electronic component of light, be not restricted in this.
Treatment element 13 is to according to each light-emitting component in aforementioned K light-emitting component (being 9 by taking the present embodiment as an example)
Corresponding N number of power parameter (common N × K power parameter), wherein at least partial power parameter determine K light-emitting component
In each light-emitting component driving current value.According to an embodiment, treatment element 13 can be ASIC
(application-specific integrated circuit, ASIC), advanced reduced instruction set machine (advanced
RISC machine, ARM), CPU (central processing unit, CPU), single-chip controller or its
He is adapted for carrying out the equipment of computing and control instruction, is not restricted in this.
With regard to treatment element 13 determine K light-emitting component in each light-emitting component driving current value method, in other words
The driving method of light emitting module 1 in one embodiment of the invention, please with reference to Fig. 1 to Fig. 3.Wherein Fig. 3 is real according to the present invention one
The flow chart for applying the light emitting module driving method of example.As shown in step S310, treatment element 13 is arranged from K light-emitting component
A target group is constituted to sending out spectral P light-emitting component by difference, each of which light-emitting component is respectively at N number of son
Frequency range is to there is N number of power parameter.Thus, K light-emitting component be divided into the target group that is made up of P light-emitting component and by
The group to be selected constituted by Z light-emitting component, wherein K=P+Z.As shown in step S320, treatment element 13 is sent out according to aforementioned P
N × P power parameter of optical element and target spectrum, calculate the P estimation current value corresponding to aforementioned P light-emitting component,
Wherein this target spectrum in N number of frequency sub-band to there is N number of target spectrum value.As shown in step S330, treatment element 13 is according to this
Target spectrum, the N × P power parameter corresponding to preceding aim group and aforementioned P estimation current value, are calculated luminous frequency
Spectrum error.As shown in step S340, treatment element 13 judges whether aforementioned luminous error of spectrum meets judgment criterion.
In the step of whether luminous error of spectrum meets judgment criterion is judged, when luminous error of spectrum meets judgment criterion
When, as shown in step S350, treatment element 13 sets aforementioned P and estimates that current value drives electricity as P of aforementioned P light-emitting component
Flow valuve.When luminous error of spectrum does not meet judgment criterion, as shown in step S360, treatment element 13 is missed according to luminous frequency spectrum
Difference, the N × P power parameter corresponding to P light-emitting component in target group and correspond to group to be selected in Z light-emitting component
N × Z power parameter, calculate target group in P light-emitting component and each luminous unit in Z light-emitting component in group to be selected
Correlation coefficient corresponding to part.And as shown in step S370, treatment element 13 selects in Z light-emitting component of group to be selected one
Individual light-emitting component adds target group, wherein the correlation coefficient corresponding to selected light-emitting component meets a selection criterion.
Step S320 is may return to afterwards.
In order to take off step on describing in detail, refer to Fig. 1 and Fig. 3, below illustrate with light-emitting component in Fig. 1 111 to send out
As a example by optical element 119.With regard to step S310, in a kind of implementation, from light-emitting component 111 to light-emitting component 119 in select P
The method of individual light-emitting component can arbitrarily select P (for example, 3) light-emitting component.In another kind of implementation, can be pre-
P light-emitting component is selected first.In another implementation, can from light-emitting component 111 to light-emitting component 119 in optional two
Light-emitting component, the power parameter of luminous each frequency sub-band of frequency spectrum of the two light-emitting components is multiplied, and is lighted with obtaining the two
The coefficient of contingency of element.P light-emitting component for then selecting the coefficient of contingency each other minimum.
Fig. 4 A to Fig. 4 B are refer to, Fig. 4 A are the luminous spectrum diagram of light-emitting component 111 in one embodiment of the invention, are schemed
4B is the luminous spectrum diagram of light-emitting component 113 in one embodiment of the invention.For example, as shown in Figure 4A and 4B,
The luminous frequency spectrum of light-emitting component 111 and light-emitting component 113 is divided into 5 frequency sub-band respectively, and each frequency sub-band has respectively
Its corresponding power parameter, that is, power parameter A111_1To A111_5And power parameter A113_1To A113_5.It is luminous when calculating
During the coefficient of contingency of element 111 and light-emitting component 113, calculated with following equation：
In aforesaid equation (1), R111_113Represent the coefficient of contingency between light-emitting component 111 and light-emitting component 113.When send out
Optical element 111 is higher to the coefficient of contingency of any two light-emitting component in light-emitting component 119, then it represents that the two light-emitting components
Luminous frequency spectrum closer to.If conversely, the coefficient of contingency of any two light-emitting component is lower, then it represents that the two light-emitting components send out
Optical spectrum difference is bigger.Therefore, if it is desired to two light-emitting components are selected in from light-emitting component 111 to light-emitting component 119 as mesh
During mark group, then two light-emitting components for selecting the coefficient of contingency minimum.Assume that two minimum light-emitting components of the coefficient of contingency are to send out
Optical element 113 and light-emitting component 117, if then wanting to select the 3rd light-emitting component as target group a period of time, can select phase
With regard to the coefficient of contingency and the coefficient of contingency the and minimum light-emitting component for being relevant to light-emitting component 117 of light-emitting component 113.
Additionally, in another implementation, from light-emitting component 111 to light-emitting component 119 in select P light-emitting component
The luminous frequency spectrum of target spectrum and each light-emitting component can be divided into N number of frequency sub-band by method respectively.Consequently, it is possible to
Target spectrum is divided into N number of frequency sub-band, and each frequency sub-band has a corresponding target spectrum value, and so-called target spectrum value is exactly
The desired value of the luminous flux of corresponding frequency sub-band.Meanwhile, the luminous frequency spectrum of each light-emitting component is also partitioned into N number of son frequency
Section, and N number of frequency sub-band one-to-one corresponding of this N number of frequency sub-band and target spectrum.Each frequency sub-band in this N number of frequency sub-band also divides
Not other power parameter of the corresponding light-emitting component in this frequency sub-band.The power parameter of a so-called frequency sub-band can be one and send out
When optical element is subject to per unit driving current (a for example, milliampere), in the luminous flux that this frequency sub-band is produced.Then from send out
Optical element 111 is arbitrarily selected a light-emitting component into light-emitting component 119 or sequentially selects a light-emitting component, will be selected
The to send out spectral N number of corresponding N number of power parameter of frequency sub-band, the N number of frequency sub-band pair with target spectrum of light-emitting component out
The N number of target spectrum value answered is multiplied and takes sum of products, if N number of power parameter and N number of target spectrum value are considered as two N-dimensionals
Vector, then this sum of products can be used to represent the two N-dimensionals vector (namely N number of power parameter and N number of target spectrum)
Mutual projection amount.Thereby method can obtain the luminous frequency spectrum of each light-emitting component and the correlation coefficient of target spectrum.
For example, when the correlation coefficient of luminous frequency spectrum and target spectrum of light-emitting component 113 is calculated, it is assumed that N is equal to
5, then calculate using following equation：
In aforesaid equation (2), R113_dFor the correlation coefficient of the luminous frequency spectrum and target spectrum of light-emitting component 113, A113_i
For the power parameter of i-th frequency sub-band of light-emitting component 113, and Ad_iFor the target spectrum of i-th frequency sub-band of target spectrum
Value.After the correlation coefficient of the luminous frequency spectrum of each light-emitting component and target spectrum is calculated, can be from light-emitting component 111 to sending out
P correlation coefficient highest light-emitting component is selected in optical element 119, or is higher than a correlation coefficient threshold value from correlation coefficient
Multiple light-emitting components in select P light-emitting component, so as to constitute a target group.
With regard to step S320, in an implementation, the N × P power ginseng according to aforementioned P light-emitting component to be performed
Number and target spectrum, calculate the step of estimating current value corresponding to P of aforementioned P light-emitting component, can be put down with non-negative minimum
Method carrys out computing.Details are as follows for a kind of flow process of the method, and aforementioned N × P power parameter is first organized into the work(of a N × P
Rate parameter array AP, each of which is arranged corresponding to a light-emitting component, per a line corresponding to a frequency sub-band.And by target spectrum
The corresponding N number of target spectrum value of N number of frequency sub-band be organized into the target spectrum array B of N × 1, then following column matrix fortune
The relaying current array S for calculating to be calculated P × 1P, then relay current array SPIn P element correspond respectively to P
P relaying current value of light-emitting component.
Wherein (AP)TIt is for power parameter array ApTransposed matrix, and [(AP)TAp]-1It is for [(AP)TAp] inverse matrix.
Corresponding P of P light-emitting component can once be calculated by aforesaid equation (3) and relay current value, ideally use such P
Individual relaying current value is equal to target spectrum mixing can the light that P light-emitting component sends as driving current.And
Afterwards, if this P relaying current value is all nonnegative value, using this P relaying current value as estimation current value, and aforementioned to be selected
The corresponding Z current value of Z light-emitting component in group is set to 0, so as to constitute the estimation current array X of K × 1.
In some situations, some of aforementioned P relaying current value relaying current value is negative value, and is actually used for driving
The electric current of dynamic light-emitting component is negative value then no any physical significance.Therefore relaying current array S must be correctedPAnd make in P
Relay flow valuve is all nonnegative value, and details are as follows for its method.First, obtain P relaying current value will be previously calculated to arrange as P
× 1 record current array XPIf never calculated, will record current array XPIn each element be set to zero.And
Afterwards, a negative current value is found out from P relaying current value, according to record current array XP, be found come this is negative
Current value and this P relaying current value, calculate a corrected record current array XP.By corrected record electricity
Stream array XPIn be that the zero corresponding light-emitting component of element is moved to group to be selected from target group.Then repeat step S320,
The relaying current array S for the last obtainingPIn all of element value be all higher than zero, now will relaying current array SPAs discipline
Record current array XP, and estimation is constituted together with the corresponding Z current value of the Z light-emitting component (being all 0) in group to be selected
Current array X.
With regard to step S330, in an implementation, perform according to this target spectrum, corresponding to preceding aim group
N × P power parameter and aforementioned P estimation current value, the step of be calculated luminous error of spectrum.It is with following equation
Calculate：
E=B-AX (4)
Luminous error of spectrum array Es of the wherein E for N × 1, the value of each element in the error of spectrum that lights array E
Corresponding to the luminous error of spectrum value of one of N number of frequency sub-band.Estimate arrays of the current array X for K × 1.And array A
Join for N × P power parameter of P light-emitting component of target group, and N × Z power of Z light-emitting component of group to be selected
The matrix of several constituted N × K.Due to estimating that including the element (current value) that Z is 0 in current array X is come with P
From in relaying current array SPCurrent value, therefore equation (4) can also be write as following equation (4-1)
E=B-APSP (4-1)
With regard to step S340, in an implementation, to judge whether aforementioned luminous error of spectrum meets judgment criterion
When, the judgment criterion for being used can be that " whether the absolute value of all elements of luminous error of spectrum array E both less than is pre-
If tolerance value ", wherein default tolerance value is an arithmetic number.In another implementation, judgment criterion can " be sent out
The summation of the square value of the specific multiple elements in optical spectrum error array E is less than a default tolerance value ", wherein default
Tolerance value is an arithmetic number, specific multiple elements can be selected in advance, or whole element.In more one implementation
In mode, judgment criterion can be that " whether the luminous error of spectrum array E for this time calculating is calculate multiple luminous
In error of spectrum array E, a luminous error of spectrum array E of the summation minimum of the square value of specific multiple elements ".According to this
The spirit of invention, judgment criterion can also have other setting means, and here is not any limitation as.
With regard to step S360, in an implementation, be according to luminous error of spectrum, corresponding to P in target group
N × P the power parameter of light-emitting component and the N × Z power parameter corresponding to Z light-emitting component in group to be selected, calculate
P light-emitting component and the correlation coefficient corresponding to each light-emitting component in Z light-emitting component in group to be selected in target group, can
To calculate according to following equation：
W=AT(B-AX) (5)
The power parameter array A of correlation coefficient array ws of the wherein w for N × 1, A for a N × K, wherein power ginseng
Every string in number array A is corresponding to one of K light-emitting component.K can be calculated by upper formulation (5) to light
The correlation coefficient of each light-emitting component and luminous error of spectrum in element.
With regard to step S370, in an implementation, a luminous unit in Z light-emitting component of group to be selected to be selected
Part adds target group, wherein the correlation coefficient corresponding to selected light-emitting component meets a selection criterion, this selects accurate
Can be then, from Z light-emitting component, to select corresponding one light-emitting component of correlation coefficient highest.In another implementation side
In formula, selection criterion can give a correlation coefficient threshold value, and from Z light-emitting component, correlation coefficient is higher than this phase relation
In multiple light-emitting components of number threshold value, one of them is selected.Mat step S360 and step S370, can find out and be adapted to
One light-emitting component of the luminous error of spectrum of compensation.
In another embodiment of the present invention, Fig. 5 is refer to, which is the driving of the light emitting module according to one embodiment of the invention
Method flow diagram.First as shown in step S510, each light-emitting component in multiple light-emitting components is tried to achieve with non-negative least square method
Estimation current value.The non-negative least square method is Fig. 3 with the method described by relevant paragraph.For another example step S520 institute
Show, record the corresponding multiple estimation current values for estimating maximum in current value of aforesaid plurality of light-emitting component.And such as step S530 institute
Show, judge that this estimates whether current value is more than the allowable current higher limit of corresponding light-emitting component.If this estimates current value not
More than allowable current higher limit, then terminate the method, estimate current value as multiple driving current value to drive using aforesaid plurality of
Corresponding multiple light-emitting components.If this estimates that current value is more than allowable current higher limit, as shown in step S540, more this is held
Perhaps current upper limit value lists basis in, then returns to step S510 and calculates multiple light-emitting components with non-negative least square method again
In multiple light-emitting components multiple estimation current values.Therefore the multiple driving current value calculated in the present embodiment are not
Allowable current higher limit can be more than.
Particularly, in step S540, if the estimation current value of maximum is more than allowable current higher limit, amendment can be performed
Program.According to this program, can find out in P light-emitting component of target group, corresponding to first of maximum estimation current value
Optical element.Then using allowable current higher limit as the first estimation current value of the first light-emitting component of correspondence.Step is returned to then
S510, the first light-emitting component corresponding first estimation current value is maintained static, and calculates P corresponding to target group
In optical element, P-1 estimation current value of the P-1 light-emitting component in addition to the first light-emitting component.
Further, since being necessary to monitor and update the luminous frequency spectrum of light-emitting component, in an embodiment of the present invention, monitoring is simultaneously
Update sending out method spectral details are as follows for light-emitting component.In a kind of implementation, Fig. 6 is refer to, which is according to the present invention
The functional-block diagram of the light emitting module of another embodiment.As shown in fig. 6, compared to the light emitting module 1 in Fig. 1, it is luminous in Fig. 6
Module 1 ' has further included a spectrum analyses element 15 and a memory cell 17.Spectrum analyses element 15 and memory cell 17
It is electrically connected with treatment element 13 respectively.In the first implementation, spectrum analyses element 15 is when being enabled, to examine
Survey and analyze the luminous frequency spectrum of one of light-emitting component 111 to 119.In second implementation, spectrum analyses element 15
When being enabled, to detect and analyze the 1 ' emergent light of light emitting module mixed by light that light-emitting component 111 to 119 is sent
Frequency spectrum.And memory cell 17 is data, the target for storing many power parameters corresponding to light-emitting component 111 to 119
The data temporarily stored required for frequency spectrum and treatment element 13.According to the spirit of the present invention, memory cell 17 can be static
Random access memory, Dynamic Random Access Memory, read-only memory, electronics can program read-only memory, fast flash memory banks
Deng the memory with storage data function, volatility memory or non-volatile memory unit are not particularly limited to.
In the first implementation, when every time starting light emitting module 1 ', light-emitting component 111 to 119 can first by according to
The enable and releasing enable of sequence, and make the same time only have a light-emitting component and be enabled.Meanwhile, spectrum analyses element 15 can sequentially
Detect and analyze the luminous frequency spectrum of light-emitting component 111 to 119 respectively, and treatment element 13 can analyze institute spectrum analyses element 15
The 9 luminous frequency spectrums for obtaining are updated in memory cell 17 respectively, send out spectral corresponding to 9 of light-emitting component 111 to 119
Record.Flow process as shown in Figure 3 is carried out then, with using light-emitting component 111 to light-emitting component 119 obtaining a luminous frequency spectrum
Level off to the emergent light of target spectrum.By this method, due to light-emitting component, especially light emitting diode, response time
Quickly, above-mentioned flow process can be completed within the extremely short time, has delay without allowing user to perceive light emitting module 1 '
The phenomenon of startup.
In second implementation, in the state of light emitting module 1 ' has been actuated while, can be fast at set intervals
Fast ground is sequentially closed and enable or quickly starts and be re-closing off light-emitting component 111 to 119 and (hold apparent light emitting module 1 ' again
In the state of being activated, depending on whether the light-emitting component is enabled), due to starting light emitting module according to the flow chart shown in Fig. 3
After 1 ', in light-emitting component 111 to 119, the driving current of each light-emitting component has been fixed.Therefore can calculate according to this luminous
The corresponding N number of power parameter of each light-emitting component in element 111 to 119.
As an example it is assumed that light-emitting component 115 is driven by 0.5 ampere of electric current when light emitting module 1 ' starts, then spectrum
Analysis element 15 first detects and analyzes the first spectrum that light emitting module 1 ' under normal condition is sent, and after-treatment component 13 is quick
Light-emitting component 115 is closed by ground, and now spectrum analyses element 15 is detected and analyzes the light emitting module when light-emitting component 115 is closed
1 ' the second spectrum for being sent, then, spectrum analyses element 15 all sends the first spectrum and the second spectrum to treatment element
13.Treatment element 13 can be calculated according to 0.5 Ampere currents of the first spectrum, the second spectrum and driven for emitting lights element 115
Light-emitting component 115 is in the corresponding N number of power parameter of N number of frequency sub-band.Treatment element 13 is stored in update with this N number of power parameter
N number of power parameter of light-emitting component 115 is corresponded in memory cell 17.Thereby, the work(of each light-emitting component can be updated at any time
Rate parameter, and the driving current of each light-emitting component in light emitting module 1 ' can be adjusted according to current power parameter.
In sum, according to the light emitting module realized of the present invention and its driving method can according to a target spectrum with
And the multiple power parameters corresponding to multiple light-emitting components, calculate the driving current value for driving each light-emitting component.
And calculate with the error of spectrum value produced by aforesaid plurality of driving current value driven for emitting lights element, when error of spectrum value do not meet it is pre-
During the phase, the flow process of duplicate invention of laying equal stress on error of spectrum value correlation coefficient one light-emitting component of highest is still further found out, finally
To multiple light-emitting components and corresponding multiple driving currents so that the corresponding frequency spectrum of light of mixed generation is close to target
Frequency spectrum.
Certainly, the present invention can also have other various embodiments, in the case of without departing substantially from spirit of the invention and its essence, ripe
Know those skilled in the art and work as and various corresponding changes and deformation, but these corresponding changes and change can be made according to the present invention
Shape should all belong to the protection domain of appended claims of the invention.
Claims (12)
1. a kind of driving method of light emitting module, it is characterised in that include：
Arranging and a target group being constituted to sending out spectral P light-emitting component by difference, each light-emitting component is respectively at N number of
Frequency sub-band is to there is N number of power parameter；
According to the N × P power parameter and a target spectrum of the P light-emitting component, calculate corresponding to the P light-emitting component
P estimation current value, the target spectrum is in N number of frequency sub-band to there is N number of target spectrum value；
According to the target spectrum, the N × P power parameter corresponding to the target group and this P estimation current value, one is calculated
Luminous error of spectrum；And
Judge whether the luminous error of spectrum meets a judgment criterion；
Wherein when the luminous error of spectrum meets the judgment criterion, set this P and estimate current value as the P light-emitting component
P driving current value, P and N are positive integer.
2. the driving method of light emitting module according to claim 1, it is characterised in that further include by Z light emitting device group
Into a group to be selected, each light-emitting component in the Z light-emitting component is respectively at N number of frequency sub-band to there is N number of power ginseng
Number, the group to be selected and the target group mutual exclusion, Z is positive integer, and is wherein judging whether the luminous error of spectrum meets this
In the step of judgment criterion, when the luminous error of spectrum does not meet the judgment criterion, comprising：
It is luminous with corresponding to the Z according to the luminous error of spectrum, the N × P power parameter corresponding to the P light-emitting component
N × Z the power parameter of element, calculates the correlation coefficient corresponding to each light-emitting component in the Z light-emitting component；And
A light-emitting component in the Z light-emitting component is selected to add the target group according to the correlation coefficient.
3. the driving method of light emitting module according to claim 1, it is characterised in that send out corresponding to the P calculating
In the step of this P of optical element estimates current value, it is to utilize
SP=[(AP)TAP]-1(AP)TB
Wherein SPFor P × 1 array, SPEach element estimate one of current value, A corresponding to this PPFor one N × P
Array, APEvery string be made up of the N number of power parameter corresponding to one of the P light-emitting component, B is N × 1 gust
Row, each element of B is corresponding to one of N number of target spectrum value.
4. the driving method of light emitting module according to claim 1, it is characterised in that calculating the luminous error of spectrum
In step, it is to utilize
E=B-APSP
Wherein E is N × 1 array, the error amount of each element of E corresponding to one of N number of frequency sub-band, SPFor a P
× 1 array, SPEach element estimate one of current value, A corresponding to this PPFor one N × P arrays, APEvery string
It is made up of the N number of power parameter corresponding to one of the P light-emitting component, B is N × 1 array, each of B is first
Element is corresponding to one of N number of target spectrum value.
5. the driving method of light emitting module according to claim 1, it is characterised in that send out corresponding to the P calculating
In the step of this P of optical element estimates current value, it is to calculate this P estimation current value using non-negative least square method.
6. the driving method of light emitting module according to claim 1, it is characterised in that estimate current value for this P in setting
For the P light-emitting component P driving current value the step of in, comprising：
Find out this P and estimate a maximum estimated current value in current value；
The maximum estimated current value is compared with an allowable current higher limit；
If the maximum estimated current value is more than the allowable current higher limit, a revision program is performed, the revision program is included：
Find out in the P light-emitting component, corresponding to one first light-emitting component of the maximum estimated current value；
Using the allowable current higher limit as to should the first light-emitting component first estimation current value；And
N × P the power parameter and the target spectrum according to the P light-emitting component is returned to, is calculated luminous corresponding to the P
The step of P of element estimates current value, and more calculate corresponding to the P light-emitting component according to the allowable current higher limit
In, P-1 estimation current value of the P-1 light-emitting component in addition to first light-emitting component；And
If the maximum estimated current value is all not more than the allowable current higher limit, estimate that current value drives electricity as this P with this P
Flow valuve.
7. a kind of light emitting module, it is characterised in that include：
The target group constituted to sending out spectral P light-emitting component by difference, each light-emitting component is respectively at N number of son
Frequency range is to there is N number of power parameter；And
One treatment element, is electrically connected to the P light-emitting component, to the N × P power ginseng according to the P light-emitting component
Number and a target spectrum, calculate the P estimation current value corresponding to the P light-emitting component, and the target spectrum is in N number of frequency sub-band
To there is N number of target spectrum value, then according to the target spectrum, corresponding to the N × P power parameter and the P of the target group
Individual estimation current value, calculates a luminous error of spectrum, and judges whether the luminous error of spectrum meets a judgment criterion；
Wherein when the luminous error of spectrum meets the judgment criterion, set this P and estimate current value as the P light-emitting component
To drive the P light-emitting component, P and N is positive integer to P driving current value.
8. light emitting module according to claim 7, it is characterised in that further include by Z light-emitting component constitute it is one to be selected
Group, each light-emitting component in the Z light-emitting component respectively at N number of frequency sub-band to there is N number of power parameter, the group to be selected
Group with the target group mutual exclusion, the treatment element in the step of whether luminous error of spectrum meets the judgment criterion is judged,
When the luminous error of spectrum does not meet the judgment criterion, according to the luminous error of spectrum, being somebody's turn to do corresponding to the P light-emitting component
N × P power parameter and the N × Z power parameter corresponding to the Z light-emitting component, calculate each in the Z light-emitting component
Correlation coefficient corresponding to light-emitting component, and select a light-emitting component in the Z light-emitting component to add according to the correlation coefficient
The target group.
9. light emitting module according to claim 7, it is characterised in that the treatment element calculates luminous corresponding to the P
When this P of element estimates current value, it is to utilize
SP=[(AP)TAP]-1(AP)TB
Wherein SPFor P × 1 array, SPEach element estimate one of current value, A corresponding to this PPFor one N × P
Array, APEvery string be made up of the N number of power parameter corresponding to one of the P light-emitting component, B is N × 1 gust
Row, each element of B is corresponding to one of N number of target spectrum value.
10. light emitting module according to claim 7, it is characterised in that the treatment element is calculating the luminous error of spectrum
When, it is to utilize
E=B-APSP
Wherein E is N × 1 array, the error amount of each element of E corresponding to one of N number of frequency sub-band, SPFor a P
× 1 array, SPEach element estimate one of current value, A corresponding to this PPFor one N × P arrays, APEvery string
It is made up of the N number of power parameter corresponding to one of the P light-emitting component, B is N × 1 array, each of B is first
Element is corresponding to one of N number of target spectrum value.
11. light emitting modules according to claim 7, it is characterised in that the treatment element is being calculated corresponding to the P
When this P of optical element estimates current value, this P estimation current value is calculated using non-negative least square method.
12. light emitting modules according to claim 7, the wherein treatment element are the P this P estimation current value is set
P driving current value of light-emitting component is driving during the P light-emitting component, it is characterised in that include：
Find out this P and estimate a maximum estimated current value in current value；
The maximum estimated current value is compared with an allowable current higher limit；
If the maximum estimated current value is more than the allowable current higher limit, a revision program is performed, the revision program is included：
Find out in the P light-emitting component, corresponding to one first light-emitting component of the maximum estimated current value；
Using the allowable current higher limit as to should the first light-emitting component first estimation current value；And
N × P the power parameter and the target spectrum according to the P light-emitting component is returned to, is calculated luminous corresponding to the P
The step of P of element estimates current value, and more calculate corresponding to the P light-emitting component according to the allowable current higher limit
In, P-1 estimation current value of the P-1 light-emitting component in addition to first light-emitting component；And
If the maximum estimated current value is all not more than the allowable current higher limit, estimate that current value drives electricity as this P with this P
Flow valuve.
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Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101536606A (en) * | 2006-10-31 | 2009-09-16 | Tir科技公司 | Light source comprising light-emitting clusters |
| CN102182983A (en) * | 2010-12-10 | 2011-09-14 | 浙江大学 | Light source device and method for tuning light energy spectrum |
| CN102301621A (en) * | 2011-04-12 | 2011-12-28 | 华为技术有限公司 | Method and apparatus for monitoring optical power |
| CN102997994A (en) * | 2012-11-23 | 2013-03-27 | 北京航空航天大学 | Skylight spectrum stimulating method based on artificial light source |
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| DE10025821A1 (en) * | 2000-05-25 | 2002-07-25 | Sickinger Monika | LED light source |
| US7643869B1 (en) * | 2004-03-17 | 2010-01-05 | Dabiri Ali E | Apparatus for non-invasive cancerous tissue diagnosis and tomography using terahertz imaging |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101536606A (en) * | 2006-10-31 | 2009-09-16 | Tir科技公司 | Light source comprising light-emitting clusters |
| CN102182983A (en) * | 2010-12-10 | 2011-09-14 | 浙江大学 | Light source device and method for tuning light energy spectrum |
| CN102301621A (en) * | 2011-04-12 | 2011-12-28 | 华为技术有限公司 | Method and apparatus for monitoring optical power |
| CN102997994A (en) * | 2012-11-23 | 2013-03-27 | 北京航空航天大学 | Skylight spectrum stimulating method based on artificial light source |
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