CN106162981A - Light mixing method based on three-primary color LED - Google Patents
Light mixing method based on three-primary color LED Download PDFInfo
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- CN106162981A CN106162981A CN201610344693.5A CN201610344693A CN106162981A CN 106162981 A CN106162981 A CN 106162981A CN 201610344693 A CN201610344693 A CN 201610344693A CN 106162981 A CN106162981 A CN 106162981A
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Abstract
The invention discloses a kind of light mixing method based on three-primary color LED, it comprises the following steps: utilizes spectrometer to obtain each monochromatic light ray spectral power distributions, and calculates corresponding each monochromatic tristimulus values；Obtained light measurement and the colorimetric performance parameter etc. of RGB three-primary color LED by spectrometer test.The present invention uses ruddiness, green glow, blue light to carry out mixed light, uses PWM mode light modulation.Obtained the proportioning of theoretical three primary colours by the three primary colours mixed light Mathematical Modeling set up, impact due to junction temperature, the chromaticity coordinates of synthesis white light and colour temperature can occur deviation, find the relation between the chromaticity coordinates of synthesis light and three primary colours dutycycle by the dutycycle regulating R, G, B lamp bead in synthesis white light respectively.The present invention has that adjustable color temperature scope is wide, the simple feature of Mathematical Modeling, can improve the light quality of White-light LED illumination, make photoenvironment more comfortable, healthy, intelligent adjustable, meet the demand to illumination for the people.
Description
Technical field
The present invention relates to a kind of LED light mixing method, particularly relate to a kind of light mixing method based on three-primary color LED.
Background technology
In recent years, LED gradually replaces conventional illumination sources to become novel lighting source, and LED light source has volume
The plurality of advantages such as little, colour gamut is wide, energy-conservation, life-span length, controllability are strong, the various intelligent lamps wherein occurring on market are employed gradually
In some commercial lighting fields, but on market, the quality of intelligent lamp is uneven, and owing to LED heating causes look drift etc. to be asked
How topic, improve the illumination of the light quality especially white light of intelligent lamp illumination, make photoenvironment more comfortable, healthy, intelligent adjustable,
Meet the demand to illumination for the people, become study hotspot.
Content of the invention
The technical problem to be solved is to provide a kind of light mixing method based on three-primary color LED, and it has adjustable
Reference color temperature is wide, the simple feature of Mathematical Modeling, can be improved the light quality of White-light LED illumination by the method, allows illumination ring
Border is more comfortable, healthy, intelligent adjustable, meets the demand to illumination for the people.
The present invention solves above-mentioned technical problem by following technical proposals: a kind of mixed light based on three-primary color LED
Method, it comprises the following steps:
Step one, utilize spectrometer to obtain each monochromatic light ray spectral power distributions, and calculate corresponding each monochromatic three thorns
Swash value；
Step 2, the light measurement and the colorimetric performance parameter that are obtained RGB three-primary color LED by spectrometer test；
Step 3, the target color coordinates determining mixed light and colour temperature；
Step 4, according to color be added principle, the tristimulus values of described mixed light be equal to each monochromatic tristimulus values value
It is added, finally give three primary colours mixed light Mathematical Modeling and obtain each monochromatic ratio in mixed light, obtaining colour mixture equation group；
Step 5, employing PWM mode light modulation measure its luminous flux by the dutycycle regulating R, G, B lamp bead respectively, point
Do not regulate monochromatic dutycycle and obtain the relational expression of dutycycle and luminous flux；
Each monochromatic dutycycle needed for step 6, respectively adjustment Theory, the optical parametric of test synthesis light, with aim colour
Light compares, and due to the impact of junction temperature, the chromaticity coordinates of synthesis light can drift about, by regulating each monochrome in synthesis light respectively
The ratio of light, finds the relation of each monochromatic light dutycycle and synthesis light chromaticity coordinates, and then the relational expression by re-establishing adjusts
The ratio of three primary colours synthesizes target coloured light, revises the look drift that junction temperature is brought.
Preferably, the described light mixing method based on three-primary color LED uses RGB tri-blended-light, is added principle according to color, described
The tristimulus values of mixed light is equal to each monochromatic tristimulus values value and is added, and finally gives three primary colours mixed light Mathematical Modeling, according to
Three primary colours mixed light Mathematical Modeling, obtains each monochromatic ratio and colour mixture equation group in mixed light.In such cases, mixed light equation
Group has unique solution, wherein (xT,yT) represent the coordinate of color of object to be allotted, (xR,yR), (xG,yG), (xB,yB), respectively
Represent three primary colors R, the coordinate of G, B, [kR,kG,kB] represent mixed light equation group three solutions, then [kR,kG,kB] can there is following formula
Linear expression:
kB=1-kG-kB。
Preferably, the described light mixing method based on three-primary color LED uses PWM mode light modulation, and PWM light modulation is to make on-off circuit
With operation at frequencies sufficiently high for eye recognition ability, change output electricity by arranging cycle and dutycycle
The mean value of stream.By setting up the quantitative calculation of triple channel PWM light modulation toning, regulate the dutycycle of R, G, B lamp bead respectively
Regulate its luminous flux, between the dutycycle of triple channel PWM and the light colo(u)r specification of mixed light, there are the mapping relations of determination.This really
Qualitative together decided on by the geometry under PWM mixed light technology, luminosity, colourity constraints.
Preferably, the described light mixing method based on three-primary color LED calculates the dutycycle of the three primary colours of synthesis white light to theory
It is optimized correction, owing to being affected by junction temperature, deviation that the chromaticity coordinates of synthesis light and colour temperature all occur, adjustment Theory respectively
Required each monochromatic dutycycle, the optical parametric of test synthesis light, compare with target coloured light, due to junction temperature, synthesize light
Chromaticity coordinates can drift about, by regulate respectively synthesis light in each monochromatic ratio, find each monochromatic light dutycycle and conjunction
Becoming the relation of light chromaticity coordinates, then the ratio of the relational expression adjustment three primary colours by re-establishing synthesizes target coloured light, revises
The look drift that junction temperature is brought.
Preferably, described based on monochromatic light XYZ value in the light mixing method of three-primary color LED with chromaticity coordinates value below equation meter
Calculate:
Wherein X, Y, Z are monochromatic tristimulus values, KmIt for maximum spectral luminous efficacy, is worth for 683lm/W, For CIE1931 standard colorimetric observer's color matching function, S (λ) is spectral power distribution, and x, y are that look is sat
Mark.
Preferably, the described Mathematical Modeling based on the light mixing method of three-primary color LED is as follows:
Wherein φR, φG, φBFor the respective luminous flux of three primary colours.
The actively progressive effect of the present invention is: the present invention is on the basis of rgb light flux needed for theoretical mixed light, it is proposed that
A kind of solution, recombines white light by the dutycycle revising three primary colours.By regulation modified R GB tri-coloured light flux,
Changing mixed light x coordinate and y-coordinate, the chromaticity coordinates making chromaticity coordinates be related to coloured light to target moves, and which reduces chromaticity coordinates
Deviation, it is possible to reduce the deviation of colour temperature.When chromaticity coordinates x and y deviation delta x, Δ y meet within 0.003 simultaneously, and related
Colour temperature deviation is within 50K, then regulation three primary colours dutycycle round-off error is just satisfied be require that.Owing to colour temperature is higher, permissible
Increase red LED dutycycle, the corresponding dutycycle reducing green LED and blue led.By finding R, G, B difference in mixed light
The relation of dutycycle and chromaticity coordinates during change, thus readjust three primary colours ratio, make up the shadow to mixed light colour temperature for the temperature
Ring.
Brief description
Fig. 1 is the flow chart of the present invention.
Fig. 2 is that RGB three-color LED connects distribution map.
Fig. 3 is for increasing the dutycycle of red LED, and the x coordinate of synthesis white light is with the variation diagram of dutycycle.
Fig. 4 is for increasing the dutycycle of red LED, and the y-coordinate of synthesis white light is with the variation diagram of dutycycle.
Fig. 5 is for reducing the dutycycle of green LED, and the x coordinate of synthesis white light is with the variation diagram of dutycycle.
Fig. 6 is for reducing the dutycycle of green LED, and the y-coordinate of synthesis white light is with the variation diagram of dutycycle.
Fig. 7 is for reducing the dutycycle of blue led, and the x coordinate of synthesis white light is with the variation diagram of dutycycle.
Fig. 8 is for reducing the dutycycle of blue led, and the y-coordinate of synthesis white light is with the variation diagram of dutycycle.
Detailed description of the invention
Provide present pre-ferred embodiments below in conjunction with the accompanying drawings, to describe technical scheme in detail.
According to colorimetry principle, on International Commission on Illumination (CIE) x-y chromaticity diagram, two kinds of blend of colors produce the
Three kinds of colors are on the straight line connecting two kinds of colors.In like manner, the light of three primary colours synthesis is in the triangle connecting three kinds of colors.Root
Understanding according to Jim Glassman mixing principle, the colour temperature of synthesis white light is determined by the ratio of three primary colours, so different-colour in black body-line
White light can by regulate RGB ratio realize.Utilize PWM light regulating technology can regulate R, G, B dutycycle in high precision,
Realize required ratio R, the luminous flux of G, B, the final purpose realizing precisely light modulation toning.
As currently preferred technical scheme, use the method for RGB three primary colours mixed light, need first for RGB three primary colours
Luminous intensity distribution model study.If the chromaticity coordinates of color of object to be allotted is (xT,yT), three primary colors R, G, B look of use is sat
Mark is respectively (xR,yR)、(xG,yG)、(xB,yB), spectral power distribution is respectively SR(λ)、SG(λ)、SB(λ), CIE1931
Standard colorimetric observer's color matching function isCorresponding tristimulus values is respectively (XT,YT,ZT), (XR,
YR,ZR), (XG,YG,ZG), (XB,YB,ZB), luminous flux is respectively φT、φR、φG、φB。
Monochromatic light XYZ value and chromaticity coordinates value can be calculated by below equation:
Wherein X, Y, Z are monochromatic tristimulus values, KmIt for maximum spectral luminous efficacy, is worth for 683lm/W, For CIE1931 standard colorimetric observer's color matching function, S (λ) is spectral power distribution, and x, y are that look is sat
Mark.
According to spectral distribution curve principle of stacking, the spectral power distribution after RGB mixed light is three spatial distribution songs
The superposition of line, is formula (3):
1931CIE standard specifies, only with tristimulus values Y in contrast, X, Z only represent colourity to light quantity, so tristimulus values
Can be represented by the formula as formula (4), wherein i=R, G, B, T:
The pure mathematics model that simultaneous above formula (2) (3) (4) arrangement obtains three primary colours mixed light is formula (5):
Final abbreviation obtains the respective luminous flux of RGB, obtains formula (6):
As currently preferred technical scheme, using PWM mode light modulation, PWM light modulation is to make on-off circuit with relatively
Sufficiently high operation at frequencies for eye recognition ability, changes the average of output electric current by arranging cycle and dutycycle
Value.By setting up the quantitative calculation of triple channel PWM light modulation toning, the dutycycle regulating R, G, B lamp bead respectively regulates it
, between the dutycycle of triple channel PWM and the light colo(u)r specification of mixed light, there are the mapping relations of determination in luminous flux.This certainty by
Geometry under PWM mixed light technology, luminosity, colourity constraints together decide on.
As currently preferred technical scheme, the dutycycle of the three primary colours calculating synthesis white light to theory is optimized
Revise.Under identical input electric power, under PWM light modulation and simulation light modulation both light-modulating modes, correlated colour temperature can be with averagely defeated
Enter the increase of electric current and raise.The increase of average current input can cause the rising of the junction temperature of LED.The rising of junction temperature can cause look
Temperature and the drift of colorimetric parameter, either simulation light modulation or PWM light modulation all cannot avoid this problem, when the temperature increases,
In mixed light, the ratio of three primary colours luminous flux there occurs change, and the chromaticity coordinates of mixed light also there occurs with the chromaticity coordinates of target coloured light
Deviation.The relation of dutycycle above and luminous flux is understood that average current affects luminous flux, when a certain monochrome of regulation mixed light
During the ratio of light, the correlated colour temperature of mixed light can change, i.e. the chromaticity coordinates of mixed light also can occur to change accordingly, thus
As long as what kind of the chromaticity coordinates of mixed light can occur change when understanding to find monochromatic light change in duty cycle, thus can be by adjusting
The dutycycle of joint three primary colours changes the chromaticity coordinates of mixed light, the final coloured light synthesizing target correlated colour temperature.The present invention is by changing
Becoming mixed light x coordinate and y-coordinate, the chromaticity coordinates making chromaticity coordinates be related to coloured light to target moves, and which reduces the inclined of chromaticity coordinates
Difference, it is possible to reduce the deviation of colour temperature.When chromaticity coordinates x and y deviation delta x, Δ y meets within 0.003 simultaneously, and related colour
Temperature deviation is within 50K, then regulation three primary colours dutycycle round-off error just meets requirement.
As it is shown in figure 1, the present invention provides the light mixing method based on three-primary color LED, comprise the following steps:
Step one, the LED selecting the unification of RGB tri-look, model is CREE 3535, for reaching to illuminate purpose, uses 6 lamps
Pearl is in parallel, and concrete distribution sees Fig. 2, utilizes spectrometer to obtain each monochromatic light ray spectral power distributions；
Step 2, the light measurement and the colorimetric performance parameter that are obtained RGB three-primary color LED by spectrometer test；
Step 3, the target color coordinates determining mixed light and colour temperature；
Step 4, according to color be added principle, the tristimulus values of described mixed light be equal to each monochromatic tristimulus values value
It is added, finally give three primary colours mixed light Mathematical Modeling, according to three primary colours mixed light Mathematical Modeling, each monochrome in mixed light can be obtained
The ratio of light, obtains colour mixture equation group.In such cases, mixed light equation group has unique solution, then [kR,kG,kB] following formula can be had linear
Formula (7) represents；
Then the respective luminous flux of three primary colours, wherein i=R, G, B can be obtained by following formula (8)
φi=kiφT------------------(8)
It is logical that step 5, the present invention use PWM mode light modulation to measure its light by the dutycycle regulating R, G, B lamp bead respectively
Amount, regulates monochromatic dutycycle respectively and obtains the relational expression of dutycycle and luminous flux；
Each monochromatic dutycycle needed for step 6, respectively adjustment Theory, the optical parametric of test synthesis light, with aim colour
Light compares, and due to junction temperature, the chromaticity coordinates of synthesis light can drift about, by regulating each monochromatic ratio in synthesis light respectively
Example, finds the relation of each monochromatic light dutycycle and synthesis light chromaticity coordinates, and then the relational expression by re-establishing adjusts three primary colours
Ratio synthesize target coloured light, revise the look drift that junction temperature is brought.
Embodiment:
Selecting the LED of RGB tri-look unification, model is 3535 three-in-one lamp bead of the RGB of the sharp CLX6A-FKB of section.Its main ripple
Long respectively λDR=623.3nm, λDG=520.2nm, λDB=465.9nm.For reaching illuminating effect, it is achieved LED accurately dims,
This experiment uses six such lamp bead to connect, and uses the light modulation toning of triple channel PWM.For reaching to illuminate purpose, use 6
Lamp bead is in parallel, utilizes spectrometer to obtain each monochromatic light ray spectral power distributions Si(λ), each monochromatic tristimulus values is then calculated.
Obtained light measurement and the colorimetric performance parameter of RGB three-primary color LED, following parameter list 1 institute by spectrometer test
Show.
The parameter list of LED lamp bead in table 1 experiment
| Lamp bead | Chromaticity coordinates X | Chromaticity coordinates Y | Luminous flux/lm |
| R | 0.7009 | 0.2988 | 41.0 |
| G | 0.1578 | 0.6388 | 85.2 |
| B | 0.3176 | 0.0509 | 24.5 |
It is then determined that the target color coordinates of mixed light and colour temperature, can be by inquiring about distribution and the warp of Planck blackbody line
Test the Photochromic Properties parameter that formula can obtain the white light of different-colour.
According to the optical performance parameter of above-mentioned three primary colours optical parametric and target coloured light, each list in mixed light can be obtained
The ratio of coloured light, thus it is calculated each monochromatic luminous flux.
Colour temperature is to describe a basic parameter of light source characteristic, the black matrix when colour temperature of light source is identical with radiation of light source color
Temperature.But light source actual emanations characteristic and black body radiation characteristic difference are relatively big, so generally describing light source by correlated colour temperature
Color characteristics.By the data of test it can be seen that the point of 9 different-colours being taken from 3000K-7500K all there occurs look
The skew of temperature, the colour temperature of mixed light all has bigger deviation with target colour temperature.Target colour temperature and chromaticity coordinates and actual mixed light
Colour temperature and chromaticity coordinates and the following parameter list of colour temperature deviation 2:
The parameter list of LED lamp bead in table 2 experiment
When LED junction temperature rise, the luminous flux of LED can significantly reduce, and now the luminous flux of RGB three primary colours all there occurs
Change in various degree.Owing to the colour temperature of reality light modulation is more higher than target colour temperature, show to lack inside mixed light ruddiness, and unnecessary
Green glow and blue light.
Dull R, G, B lamp bead, by increasing and decreasing the dutycycle of LED, the x and y coordinates of R, G, B each monochromatic light synthesis target light light
Change such as figure with dutycycle.
Owing to the colour temperature of reality light modulation is more higher than target colour temperature, show to lack inside mixed light ruddiness, and unnecessary green glow and
Blue light.The white light choosing this colour temperature of 3571K herein is tested, and specific experiment is as follows:
Dull R lamp bead, increases the dutycycle of red LED, the x and y coordinates of synthesis white light with dutycycle change such as Fig. 3 with
Fig. 4, wherein R lamp bead y-coordinate partial dot has and fluctuates up and down, in order to simplify calculating, is finally processed into herein linearly closing in figure
System.
Dull G lamp bead, reduces the dutycycle of green LED, the x and y coordinates of synthesis white light with dutycycle change such as Fig. 5 with
Fig. 6.
Dull B lamp bead, reduces the dutycycle of blue led, the x and y coordinates of synthesis white light with dutycycle change such as Fig. 7 with
Fig. 8.
Checked the chromaticity coordinates situation of change of synthesis light by the dutycycle regulating R, G, B lamp bead respectively, measure R, G, B lamp
The relation of pearl x and y coordinates and dutycycle is as shown in Fig. 3～Fig. 8, although affected by junction temperature, but during regulation dutycycle, synthesizes light
Chromaticity coordinates present reasonable linear change.So the x and y coordinates expression formula of synthesis light can be write as following formula (9):
Individually during the monochromatic lamp bead of regulation, although colour temperature can reach target colour temperature, but chromaticity coordinates has deviateed the look of target colour temperature
Coordinate, x and y coordinates deviation is 0.Beyond 003, so individually the ratio of the luminous flux of a certain primary colours of regulation is not reach target
Colour temperature, need to regulate two kinds of colors or three kinds of colors.Owing to colour temperature is higher, red LED dutycycle can be increased, subtract accordingly
Few green LED and the dutycycle of blue led.Knowable to from Fig. 3～Fig. 8, mixed light is when changing the ratio of three primary colours luminous flux,
The relatively linear change of its x and y coordinates, so being changed the ratio synthesis target of luminous flux by the dutycycle changing three primary colours
The white light of colour temperature, can row expression formula such as following formula (10):
Wherein, DR、DG、DBIt is red, green and the input of blue led initial adjustment dutycycle respectively, D'R、D'G、D'BPoint
The dutycycle not being red, green and inputting after blueness correction.k'R、k'G、k'BIt is red, green and blue adjustment duty respectively
Than when x coordinate rate of change, k "R、k″G、k″BThe rate of change of y-coordinate when being red, green and blue adjustment dutycycle respectively.x
It is the chromaticity coordinates initially synthesizing light with y, xwAnd ywIt is the chromaticity coordinates of target colour temperature.
By regulation modified R GB tri-coloured light flux, change mixed light x coordinate and y-coordinate, make chromaticity coordinates to target related colour
The chromaticity coordinates of light moves, and which reduces the deviation of chromaticity coordinates, it is possible to reduce the deviation of colour temperature.When chromaticity coordinates x and y deviation delta
X, Δ y meet within 0.003 simultaneously, and correlated colour temperature deviation is within 50K, then regulation three primary colours dutycycle correction is by mistake
Difference just meets requirement.
In like manner, its ratio synthesizing three primary colours in the white light of other colour temperatures is also according to said method just revised, and tests after correction
Experimental data all reasonable with target colour temperature coincide, chromaticity coordinates and colour temperature all allow deviation range within, by adjust
The luminous flux of joint R, G, B lamp bead solves the colour temperature offset issue that junction temperature causes, and the method is convenient to operation.By by target
The luminous flux of colour temperature sets a condition, the maximum that i.e. can reach and one rational definite value both of these case of setting, this
Two kinds of situation solution procedurees can automated programming realize, but some characterisitic parameters that programming relates to need according to concrete lamp bead
Characteristic determine, such as lamp bead x, y-coordinate are with change in duty cycle situation, the present invention have selected setting one rational definite value, ask
It is convenient to solve.
Particular embodiments described above, is carried out to the solving the technical problem that of the present invention, technical scheme and beneficial effect
Further describe, be it should be understood that the specific embodiment that the foregoing is only the present invention, be not used to limit
The present invention processed, all within the spirit and principles in the present invention, any modification, equivalent substitution and improvement etc. done, should be included in
Within protection scope of the present invention.
Claims (6)
1. the light mixing method based on three-primary color LED, it is characterised in that the described light mixing method based on three-primary color LED includes
Following steps:
Step one, utilize spectrometer to obtain each monochromatic light ray spectral power distributions, and calculate corresponding each monochromatic tristimulus values；
Step 2, the light measurement and the colorimetric performance parameter that are obtained RGB three-primary color LED by spectrometer test；
Step 3, the target color coordinates determining mixed light and colour temperature；
Step 4, according to color be added principle, the tristimulus values of described mixed light be equal to each monochromatic tristimulus values be added,
Obtain each monochromatic ratio in three primary colours mixed light Mathematical Modeling and mixed light eventually, obtain colour mixture equation group；
Step 5, employing PWM mode light modulation measure its luminous flux by the dutycycle regulating R, G, B lamp bead respectively, adjust respectively
Save monochromatic dutycycle and obtain the relational expression of dutycycle and luminous flux；
Each monochromatic dutycycle needed for step 6, respectively adjustment Theory, the optical parametric of test synthesis light, enters with target coloured light
Row compares, and due to junction temperature, the chromaticity coordinates of synthesis light can drift about, by regulating each monochromatic ratio in synthesis light respectively,
Finding the relation of each monochromatic light dutycycle and synthesis light chromaticity coordinates, then the relational expression by re-establishing adjusts the ratio of three primary colours
Example synthesizes target coloured light, revises the look drift that junction temperature is brought.
2. the light mixing method based on three-primary color LED as claimed in claim 1, it is characterised in that described based on three-primary color LED
Light mixing method uses RGB tri-blended-light, is added principle according to color, and the tristimulus values of described mixed light is equal to each monochromatic three thorns
Swash value to be added, finally give three primary colours mixed light Mathematical Modeling, according to three primary colours mixed light Mathematical Modeling, obtain each monochrome in mixed light
The ratio of light, obtains colour mixture equation group, and in such cases, mixed light equation group has unique solution, then [kR,kG,kB] use following formula linear list
Show, wherein (xT,yT) represent the coordinate of color of object to be allotted, (xR,yR), (xG,yG), (xB,yB) to represent three respectively former
Look R, the coordinate of G, B, [kR,kG,kB] represent mixed light equation group three solutions,
kB=1-kG-kB。
3. the light mixing method based on three-primary color LED as claimed in claim 2, it is characterised in that described based on three-primary color LED
Light mixing method use PWM mode light modulation, PWM light modulation is to make on-off circuit with sufficiently high for eye recognition ability
Operation at frequencies, by arranging the cycle and dutycycle changes the mean value of output electric current, by setting up the light modulation of triple channel PWM
The quantitative calculation of toning, the dutycycle regulating R, G, B lamp bead respectively regulates its luminous flux, the dutycycle of triple channel PWM
And there are the mapping relations of determination between the light colo(u)r specification of mixed light, this certainty by the geometry under PWM mixed light technology, luminosity,
Colourity constraints together decides on.
4. the light mixing method based on three-primary color LED as claimed in claim 2, it is characterised in that described based on three-primary color LED
The dutycycle of the three primary colours that light mixing method calculates synthesis white light to theory is optimized correction, owing to being affected by junction temperature, closes
The deviation that the chromaticity coordinates of Cheng Guang and colour temperature all occur, respectively each monochromatic dutycycle needed for adjustment Theory, test synthesis light
Optical parametric, compares with target coloured light, and due to junction temperature, the chromaticity coordinates of synthesis light can drift about, by regulating conjunction respectively
The each monochromatic ratio of Cheng Guangzhong, finds the relation of each monochromatic light dutycycle and synthesis light chromaticity coordinates, then by re-establishing
Relational expression adjust the ratio of three primary colours and synthesize target coloured light, revise the look drift that junction temperature is brought.
5. the light mixing method based on three-primary color LED as claimed in claim 2, it is characterised in that described based on three-primary color LED
In light mixing method, monochromatic light XYZ value and chromaticity coordinates value below equation calculate:
Wherein X, Y, Z are monochromatic tristimulus values, KmIt for maximum spectral luminous efficacy, is worth for 683lm/W, For CIE1931 standard colorimetric observer's color matching function, S (λ) is spectral power distribution, and x, y are that look is sat
Mark.
6. the light mixing method based on three-primary color LED as claimed in claim 2, it is characterised in that described based on three-primary color LED
The Mathematical Modeling of light mixing method is as follows:
Wherein φR, φG, φBFor the respective luminous flux of three primary colours.
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