CN106817811B - The method for realizing full gamut range light distribution based on PWM four primary LED - Google Patents
The method for realizing full gamut range light distribution based on PWM four primary LED Download PDFInfo
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- CN106817811B CN106817811B CN201710203141.7A CN201710203141A CN106817811B CN 106817811 B CN106817811 B CN 106817811B CN 201710203141 A CN201710203141 A CN 201710203141A CN 106817811 B CN106817811 B CN 106817811B
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- H—ELECTRICITY
- H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
- H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
- H05B45/00—Circuit arrangements for operating light-emitting diodes [LED]
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
- Y02B20/00—Energy efficient lighting technologies, e.g. halogen lamps or gas discharge lamps
- Y02B20/30—Semiconductor lamps, e.g. solid state lamps [SSL] light emitting diodes [LED] or organic LED [OLED]
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Abstract
The invention discloses a kind of methods for realizing full gamut range light distribution based on PWM four primary LED, comprising the following steps: (1), obtains the light measurement and colorimetric performance parameter of each monochrome；(2), corresponding each monochromatic tristimulus values is calculated；(3), according to luminous flux and duty ratio direct proportionality, the functional relation of luminous flux and duty ratio is derived；(4), each monochromatic ratio in three primary colours light mixing mathematical model and mixed light is obtained, colour mixture equation group is obtained；(5), target color coordinates, the colour temperature of mixed light are determined；(6), chromaticity coordinate, the functional relation of luminous flux and duty ratio are derived；(7), the luminous flux for determining target colour temperature calculates each duty ratio of RGBW, finally exports, reaches light distribution purpose.The present invention has the characteristics that product low cost, adjustable color temperature precision are high, mode is easy, illumination is comfortable and using effect is good.
Description
Technical field
The present invention relates to LED light mixing technologies, specifically a kind of to realize that full gamut range is matched based on PWM four primary LED
The method of light.
Background technique
With the gradually development of LED illumination, LED light has been widely used in the fields such as China's indoor and outdoor lighting, has been substituted
The conventional illumination devices such as incandescent lamp, fluorescent lamp become the representative of energy-saving and environmental protection, intelligent lighting.Wherein, the hair of intelligent lighting
Exhibition advantage is fairly obvious, then the feature that cooperated with LED is inherent, and the light of sending can be converged preferably, so that LED intelligent lamp
As an important application of field of LED illumination, it is widely used in the occasions such as super quotient, household, office, landscape, before market development
Scape is considerable.
Intelligent lamp light modulation toning mainly uses RGB three primary colours light distribution currently on the market, although being able to satisfy user situation illumination
Demand, but use the intelligent lamp of RGB color matching have colour temperature not precisely, the disadvantages such as luminous flux is low, be unable to satisfy client substantially according to
Bright demand.The lighting quality for how improving the light quality especially white light of intelligent lamp illumination, makes light environment more comfortable, is good for
Health, intelligence become the hot spot of research.
Summary of the invention
It is an object of the invention to overcome above the shortcomings of the prior art, a kind of product low cost is provided, can
Color-temperature regulating precision is high, mode is easy, illumination is comfortable and using effect is good realizes that full gamut range is matched based on PWM four primary LED
The method of light.
In order to achieve the above object, the invention adopts the following technical scheme: realizing full gamut model based on PWM four primary LED
Enclose the method for light distribution, comprising the following steps:
(1), the light measurement and colorimetric performance parameter of each monochrome are obtained using integrating sphere optical spectrum instrumentation；
(2), by each monochromatic light measurement and colorimetric performance parameter, corresponding each monochromatic tristimulus is calculated
Value；
(3), according to luminous flux and duty ratio direct proportionality, the functional relation of luminous flux and duty ratio is derived；
(4), principle being added according to color, the tristimulus values of the mixed light is equal to each monochromatic tristimulus values and is added,
Each monochromatic ratio in three primary colours light mixing mathematical model and mixed light is finally obtained, colour mixture equation group is obtained；
(5), target color coordinates, the colour temperature of mixed light are determined；
(6), white monochromatic color temperature value in the color temperature value and mixed light of aim colour is compared, derives that chromaticity coordinate, light are logical
The functional relation of amount and duty ratio；
(7), the luminous flux for determining target colour temperature calculates each duty ratio of RGBW, finally exports, reaches light distribution purpose.
Monochromatic tristimulus values calculation method in the step (2) are as follows:
X represents the X stimulation color of the light source；Y represents the Y stimulation color of the light source；X represents the light source chromaticity coordinates x value；Y is represented
The light source chromaticity coordinates y value.
Step (4) specific steps are as follows: Dur、Dug、Dub、DuwRepresent the duty ratio of RGBW four primary, (xm, ym)、YmGeneration
The chromaticity coordinates and luminous flux of table mixed light, (xr, yr)、(xg, yg)、(xb, yb)、(xw, yw) chromaticity coordinates of RGBW four primary is represented,
Yr、Yg、Yb、YwRepresent the luminous flux of RGBW four primary；KmRepresent the colour temperature of mixed light, KwRepresent the colour temperature of white light in four primary；
Work as Km> KwWhen, Dur=0,
Work as Km< KwWhen, Dub=0,
Step (4) the colour mixture equation group is calculated with following formula:
Xm=XR+XG+XB+XW；
Ym=YR+YG+YB+YW；
Zm=ZR+ZG+ZB+ZW；
Wherein Ar=Yr/yr、Ag=Yg/yg、Ab=Yb/yb、Aw=Yw/yw, Xm、Ym、ZmRepresent the tristimulus values of mixed light.
The functional relation of step (3) luminous flux and duty ratio are as follows: Ym=DurYr+DugYg+DubYb+DuwYw；
Wherein, Yr、Yg、Yb、YwRespectively light source R, G, B, W expires the Y values under current work, in CIE-1931 standard
Colorimeter system moderate stimulation value Y is equal to luminous flux.
The duty ratio Dur、Dug、Duh、DuwD should be metur≤ 1, Dug≤ 1, Dub≤ 1, Duw≤1。
The YmAs objective function, need to meet:
Work as Km> KwWhen, Dur=0,
Work as Km< KwWhen, Dub=0,
YmWhen taking the maximum value of above-mentioned equation, the output of mixed light highlight flux can be met.
The PWM frequency 1KHz or more.
The present invention compared with the existing technology, have following advantages and effects
1, the present invention proposes RGBW four primary light mixing method on the basis of simple R GB light mixing, by four primary by CIE-
1931 color matching stepping figures are divided into tri- sections I, II, III, pass through the parameters such as specified target color coordinates, colour temperature, luminous flux, root
According to CIE-1931 color matching stepping figure, specifying one of which light source output value is zero, and constructing other three output valves has single solution
Mathematical model derives each monochromatic functional value in RGBW four primary.It is high, square with product low cost, adjustable color temperature precision
The advantages that formula is easy, illumination is comfortable and using effect is good.
Detailed description of the invention
Fig. 1 is the flow diagram that the method for full gamut range light distribution is realized based on PWM four primary LED；
Fig. 2 is tetra- color LED connection distribution map of RGBW；
Fig. 3 is CIE-1931 color matching stepping figure.
Specific embodiment
In order to facilitate the understanding of those skilled in the art, the present invention is made further specifically with reference to the accompanying drawings and embodiments
It is bright.
Embodiment 1:
As shown in Figures 1 to 3, the method for full gamut range light distribution being realized based on PWM four primary LED, comprising the following steps:
(1), the light measurement and colorimetric performance parameter of each monochrome are obtained using integrating sphere optical spectrum instrumentation；
(2), by each monochromatic light measurement and colorimetric performance parameter, corresponding each monochromatic tristimulus is calculated
Value；
(3), according to luminous flux and duty ratio direct proportionality, the functional relation of luminous flux and duty ratio is derived；
(4), principle being added according to color, the tristimulus values of the mixed light is equal to each monochromatic tristimulus values and is added,
Each monochromatic ratio in three primary colours light mixing mathematical model and mixed light is finally obtained, colour mixture equation group is obtained；
(5), target color coordinates, the colour temperature of mixed light are determined；
(6), white monochromatic color temperature value in the color temperature value and mixed light of aim colour is compared, derives that chromaticity coordinate, light are logical
The functional relation of amount and duty ratio；
(7), the luminous flux for determining target colour temperature calculates each duty ratio of RGBW, finally exports, reaches light distribution purpose.
Specifically are as follows: desired luminous flux is Ym, desired colour temperature is Km, desired chromaticity coordinates is (xm, ym), it uses
R, G, B, W four primary coordinate are respectively (xr, yr)、(xg, yg)、(xb, yb)、(xw, yw), the luminous flux of RGBW four primary is Yr、
Yg、Yb、Yw, the colour temperature of white light is K in four primaryw。
As shown in Figure 1, the specific steps are as follows:
1, RGBW light source is selected, using 5 groups of RGB atmospheric electricity LED-2016 glory series of light sources, 5 full strings, W light source uses 12
This step to obtain 2835 high color rendering white lights series, connection type be 3 strings 4 simultaneously.It is specific to be distributed referring to fig. 2, as shown in Fig. 2, W is white light
Source R, G, B are respectively red, green, blue.Tri- light sources of RGB are one group, are symmetrically arranged amongst on light source board, 12 white light sources
Be evenly distributed on light source board, reach red, green, blue, white light it is defeated when even light mixing target.It is obtained using integrating sphere optical spectrum instrumentation
Obtain the light measurement and colorimetric performance parameter of each monochrome；
2, by each monochromatic light measurement and colorimetric performance parameter, corresponding each monochromatic tristimulus values is calculated；
Each monochromatic tristimulus values calculation formula are as follows:
3, according to luminous flux and duty ratio functional relation in direct ratio, the functional relation of luminous flux and duty ratio is derived
Formula；
Change the PWM duty cycle of driving LED, chromaticity coordinate does not change substantially, and luminous flux accordingly linear change
Change, so being approximately considered luminous flux and duty ratio functional relation in direct ratio in engineering for the convenience discussed issues:
Ym=DurYr+DugYg+DubYb+DuwYw……………………….(2)
Wherein, Dug、Dug、Dug、DugRepresent the duty ratio of RGBW four primary.
4, principle is added according to color, the tristimulus values of the mixed light is equal to each monochromatic tristimulus values and is added, most
Each monochromatic ratio in three primary colours light mixing mathematical model and mixed light is obtained eventually, obtains colour mixture equation group；
According to spectral distribution curve color addition principle:
Xm=XR+XG+XB+XW
Ym=YR+YG+YB+YW
Zm=ZR+ZG+ZB+ZW………………………(3)
It derives
Wherein, Ar=Yr/yr、Ag=Yg/yg、Ab=Yb/yb、Aw=Yw/yw, Xm、Ym、ZmRepresent the tristimulus values of mixed light.
5, target color coordinates, the colour temperature of mixed light are determined；
6, white monochromatic color temperature value in the color temperature value and mixed light of aim colour is compared, derives chromaticity coordinate, luminous flux
With the functional relation of duty ratio.
According to RGBW four primary in the coordinate value of CIE-1931 chromaticity analysis chart, chromaticity analysis chart can be divided to I, II, III
Three sections, as shown in figure 3, R, G, B respectively represent position red, that green, blue are on CIE x-y chromaticity diagram, line R,
G, B constitutes a light mixing triangle, and the color temperature value of aim colour M, line M point R point, M point G point, M point B are determined on colour temperature curve
The RGB triangle constituted is divided into tri- sections I, II, III by point.
As target colour temperature Km>KwWhen, in the section I, set Dur=0,
Then the duty ratio of four-way is acquired in combination with formula (2), (5):
As target colour temperature Km<KwWhen, in the section III, set Dub=0,
Then the duty ratio of four-way is acquired in combination with formula (2), (5):
7, the luminous flux for determining target colour temperature calculates each duty ratio of RGBW.
Theoretically in chromaticity analysis chart, the value range of luminous flux is [0, Yr+Yg+Yb+Yw], however use PWM tune
Light time, luminous flux can not achieve theoretic value range by the constraint of duty ratio.In dimming process, different chromaticity coordinates
The ratio of mixed light, RGBW four primary is different.Only duty ratio ratio is that its duty Bizet of the mixed light of 1:1:1:1 can be same
When reach 100%, at this time the value range of luminous flux be 0~Yr+Yg+Yb+Yw, the luminous flux value range of other mixed lights is then
Less than this range, every group of chromaticity coordinate has corresponding highlight flux.From practical significance, the duty ratio of PWM should expire
Sufficient Dur≤ 1, Dug≤ 1, Dub≤ 1, Duw≤ 1, YmAs objective function, (6), (7) formula are deformed and can be obtained
Km> KwWhen, Dur=0
Km< KwWhen, Dub=0
Meet (8), (9) formula luminous flux after, choose YmMaximum, bring formula (6), (7) formula into, calculate accounting for for RGBW
Empty ratio.
Testing rgb light source is atmospheric electricity LED-2016 glory series, and dominant wavelength is respectively λ r=620nm, λ g=523nm, λ
B=465nm.White light source steps to obtain 2935 high color rendering white light series using this.LED light is measured with the PMS-80 spectral investigator in a distant place
Chromatic value of each chip in full current work state in pearl.As a result as shown in the table:
Then the chromaticity coordinates M (0.4610,0.4110), K of target light are determinedm=2700K.Luminous flux Ym=120LM, wherein
Luminous flux YmMeet (9) formula, brings above-mentioned parameter into equation group (7) and obtain Dur=91%, Dug=51%, Dub=0, Duw=
11%.
Above-mentioned duty ratio is assigned in RGBW light source, the PMS-80 spectral investigator test in a target light distant place obtains Ym’
=119, M ' (0.4612,0.4116), Km’=2688K.The measured value of chromaticity coordinate, luminous flux and colour temperature is kissed compared with setting value
It closes, within 2.5%, the error of luminous flux is maintained within 4.5% the error of chromaticity coordinate.The luminous flux of LED is by junction temperature
It is affected, so, with the raising of power, the error of measured value and setting value also can be bigger when light modulation.Its error is all kept
In more reasonable range, illustrate that chromaticity coordinate described in (6), (7) formula and the functional relation of duty ratio can instruct reality
In light modulation toning.
Above-mentioned specific embodiment is the preferred embodiment of the present invention, can not be limited the invention, and others are appointed
The change or other equivalent substitute modes what is made without departing from technical solution of the present invention, are included in protection of the invention
Within the scope of.
Claims (8)
1. the method for realizing full gamut range light distribution based on PWM four primary LED, which comprises the following steps:
(1), the light measurement and colorimetric performance parameter of each monochrome are obtained using integrating sphere optical spectrum instrumentation；
(2), by each monochromatic light measurement and colorimetric performance parameter, corresponding each monochromatic tristimulus values is calculated；
(3), according to luminous flux and duty ratio direct proportionality, the functional relation of luminous flux and duty ratio is derived；
(4), principle is added according to color, the tristimulus values of mixed light is equal to each monochromatic tristimulus values and is added, finally obtains
Each monochromatic ratio, obtains colour mixture equation group in three primary colours light mixing mathematical model and mixed light；
(5), target color coordinates, the colour temperature of mixed light are determined；
(6), compare white monochromatic color temperature value in the color temperature value and mixed light of aim colour, derive chromaticity coordinate, luminous flux with
The functional relation of duty ratio；
(7), the luminous flux for determining target colour temperature calculates each duty ratio of RGBW, finally exports, reaches light distribution purpose.
2. the method according to claim 1 for realizing full gamut range light distribution based on PWM four primary LED, which is characterized in that
Monochromatic tristimulus values calculation method in the step (2) are as follows:
X represents the X stimulation color of the light source；Y represents the Y stimulation color of the light source；X represents the light source chromaticity coordinates x value；Y represents the light
Source chromaticity coordinates y value.
3. the method according to claim 2 for realizing full gamut range light distribution based on PWM four primary LED, which is characterized in that
Step (4) specific steps are as follows: Dur、Dug、Dub、DuwRepresent the duty ratio of RGBW four primary, (xm, ym)、YmRepresent mixed light
Chromaticity coordinates and luminous flux, (xr, yr)、(xg, yg)、(xb, yb)、(xw, yw) represent the chromaticity coordinates of RGBW four primary, Yr、Yg、Yb、
YwRepresent the luminous flux of RGBW four primary；KmRepresent the colour temperature of mixed light, KwRepresent the colour temperature of white light in four primary；
Work as Km> KwWhen, Dur=0,
Work as Km< KwWhen, Dub=0,
4. the method according to claim 3 for realizing full gamut range light distribution based on PWM four primary LED, which is characterized in that
Step (4) the colour mixture equation group is calculated with following formula:
Xm=XR+XG+XB+XW；
Ym=YR+YG+YB+YW；
Zm=ZR+ZG+ZB+ZW；
Wherein Ar=Yr/yr、Ag=Yg/yg、Ab=Yb/yb、Aw=Yw/yw, Xm、Ym、ZmRepresent the tristimulus values of mixed light.
5. the method according to claim 4 for realizing full gamut range light distribution based on PWM four primary LED, which is characterized in that
The functional relation of step (3) luminous flux and duty ratio are as follows: Ym=DurYr+DugYg+DubYb+DuwYw；
Wherein, Yr、Yg、Yb、YwRespectively light source R, G, B, W expires the Y values under current work, in CIE-1931 standard colorimetric system
The moderate stimulation value Y that unites is equal to luminous flux.
6. the method according to claim 5 for realizing full gamut range light distribution based on PWM four primary LED, it is characterised in that:
The duty ratio Dur、Dug、Dub、DuwD should be metur≤ 1, Dug≤ 1, Dub≤ 1, Duw≤1。
7. the method according to claim 6 for realizing full gamut range light distribution based on PWM four primary LED, which is characterized in that
The YmAs objective function, need to meet:
Work as Km> KwWhen, Dur=0,
Work as Km< KwWhen, Dub=0,
YmWhen taking the maximum value of above-mentioned equation, the output of mixed light highlight flux can be met.
8. the method according to claim 6 for realizing full gamut range light distribution based on PWM four primary LED, it is characterised in that:
The PWM frequency is 1KHz or more.
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Denomination of invention: A Method of Realizing Full Color Range Light Distribution Based on PWM Four Primary Color LED Effective date of registration: 20221125 Granted publication date: 20190101 Pledgee: Agricultural Bank of China Limited Dongyang sub branch Pledgor: HENGDIAN GROUP TOSPO LIGHTING Co.,Ltd. Registration number: Y2022330003202 |