CN105042365A - White light LED illuminating system with high light color quality and designing method thereof - Google Patents
White light LED illuminating system with high light color quality and designing method thereof Download PDFInfo
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- CN105042365A CN105042365A CN201510396993.3A CN201510396993A CN105042365A CN 105042365 A CN105042365 A CN 105042365A CN 201510396993 A CN201510396993 A CN 201510396993A CN 105042365 A CN105042365 A CN 105042365A
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F21—LIGHTING
- F21V—FUNCTIONAL FEATURES OR DETAILS OF LIGHTING DEVICES OR SYSTEMS THEREOF; STRUCTURAL COMBINATIONS OF LIGHTING DEVICES WITH OTHER ARTICLES, NOT OTHERWISE PROVIDED FOR
- F21V9/00—Elements for modifying spectral properties, polarisation or intensity of the light emitted, e.g. filters
- F21V9/40—Elements for modifying spectral properties, polarisation or intensity of the light emitted, e.g. filters with provision for controlling spectral properties, e.g. colour, or intensity
Abstract
The invention belongs to the technical field of semiconductor illumination, and particularly discloses a white light LED illuminating system with the high light color quality and a designing method thereof. As the distance Duv from color coordinate points in CIE 1931 color gamut space to a blackbody line is optimized, the LED color mixture illuminating system having the high white light preference degree at the required color temperature is obtained, the color quality of a white light source can be improved, and the lamplight environmental effect can be improved; meanwhile, the required CRI and the high GAI can be guaranteed. The color temperature adjustment range of the white light LED illuminating system is 2,000 K to 10,000K, and the distance Duv from the color coordinate points to the blackbody line is larger than or equal to -0.1 and smaller than or equal to 0. By means of the Duv-optimizing color mixture designing method, the LED illuminating system with the high white light preference degree is obtained, and the white light LED illuminating system and the designing method can be applied to illuminating places with the high light quality requirements.
Description
Technical field
The invention belongs to technical field of semiconductor illumination, be specifically related to a kind of White-light LED illumination system and method for designing thereof of specular quality.
Background technology
Light quality is more and more subject to the attention of the mankind, and particularly for room lighting, as interior spaces such as market, retail shop, hotel, museum, households, the requirement for light quality is far longer than the requirement to light efficiency.Good lighting quality, comfortable luminous environment, realize by high-quality illuminating effect.Light can have influence on the mood of people, cognition degree, the impression to the whole interior space and the visual experience to illuminated object.Have at present much about the research of light modulation toning, but major part only pays close attention to the adjustable range improving colour rendering index and expand colour temperature.In fact, the color quality improving light source is only key issue.By the light source irradiation indoor environment with specular quality, the visibility that can not only create, can also improve people's joyful degree at ambient and satisfaction, and can strengthen the saturation degree of illuminated object color, vision definition and brightness are increased, and then increases happiness sense and the comfort level of people.
Illuminating industry uses correlated colour temperature (CCT) to represent the photochromic of light source, but even if the colour temperature of light source is identical, the color of the light that they send can't be identical.Chromaticity coordinates can represent light source colour accurately, but very not directly perceived.And there are some researches show
[1 3], the white light of chromaticity coordinates point on blackbody curve is not rendered as pure white light in the visual experience of human eye, and the photochromic white light of high-quality is not on black body radiation track, and the quality of colour of light and chromaticity coordinates point are from the distance dependent of blackbody curve.Chromaticity coordinates point can use with CCT to the distance (distancefromtheblackbodyline, Duv) of blackbody curve simultaneously, can characterize the color characteristics of white light more accurately, the color quality of reflection white light.In actual domestic light application, be have certain requirements to the scope of colour temperature.Therefore, can when keeping identical colour temperature, it is photochromic that white light is improved in the position optimizing chromaticity coordinates point, thus promote indoor light environment, makes people more joyful comfortable.
Colour rendering index (CRI) is used to represent the ability of illuminated object color of reducing under light source irradiation, but not inherent contacting, can not characterize the visual effect of high color saturation light source to high color saturation object illumination especially between the CRI exponential quantity of LED and visual effect.The present invention's full gamut index (GAI) and colour rendering index characterize the color characteristics of illuminated object simultaneously.GAI is proposed by U.S.'s solid state illumination technology and system combined meeting ASSIST, the circular of GAI uses the working flare of equal-energy spectrum as with reference to light source, calculates front 8 samples of colour of CRI at light source to be measured and the ratio with reference to the gamut area under light source in CIE1976u ' v ' color gamut space.GAI can describe more accurately by the light of human brain perception and color, the reflection whole structure of light source and the subjective feeling of people's perception light source color.
The present invention uses colour temperature CCT and chromaticity coordinates point to blackbody curve distance Duv to characterize the color of white light simultaneously, and negative Duv represents that chromaticity coordinates point is below blackbody curve, and the absolute value of Duv is larger, represents that chromaticity coordinates point is far away to blackbody curve; The color of illuminated object is characterized with colour rendering index CRI and full gamut index GAI.By optimizing Duv, obtaining the white light LEDs of specular quality, can be used for the place that high-end designs space is as higher to light quality requirements in retail shop, museum, hotel lobby etc.
Summary of the invention
The object of this invention is to provide a kind of White-light LED illumination system and method for designing thereof of specular quality.
The method for designing of White-light LED illumination system provided by the invention, by chromaticity coordinates point in optimization CIE1931 color gamut space to the distance Duv of blackbody curve, the LED illumination System of high white light preference under obtaining required colour temperature; Concrete method for designing comprises the following steps:
Step 1: the colour temperature required for setting White-light LED illumination system, then tries to achieve the chromaticity coordinates of this colour temperature white light corresponding on blackbody curve in CIE1931 color gamut space.Carry out curve simulation with the blackbody curve chromaticity coordinates point of mathematical software to different temperatures, obtain the polynomial function of blackbody curve.According to chromaticity coordinates point and the blackbody curve polynomial function of required colour temperature, the isotemperature line linear equation of required colour temperature can be tried to achieve:
y=kx+b；
Step 2: get several points in this isotemperature line, each point is different to the distance Duv of blackbody curve, and then tries to achieve chromaticity coordinates corresponding to these points according to the Duv distance of isotemperature line linear equation and setting;
Step 3: the white light LEDs that described LED illumination System selects the red-light LED of three primary colors (RGB), green-yellow light LED, blue-ray LED and fluorescent material to change carrys out the white light needed for mixed light generation.For the chromaticity coordinates point of different Duv, R, G, B of this chromaticity coordinates point and the ratio of white light LEDs is met with singular value equation solution, and colour rendering index CRI under calculating different proportion and full gamut index GAI, obtain the linear relationship curve between RGB ratio when different Duv and CRI/GAI;
Step 4: select corresponding RGB and the ratio of white light LEDs according to required Photochromic Properties CRI and GAI on curve, pulse width modulation (PWM) light modulation is adopted often to be organized light output intensity needed for LED, deisgn product, obtains White-light LED illumination system during different Duv;
Step 5: the preference of the white light that the white light LEDs of experiment test observer to different Duv sends and the subjective feeling of illuminated object color, the LED illumination System with high white light preference of the Duv be optimized and correspondence.
In the present invention, the chromaticity coordinates point that the Duv of described color mixing designs method optimization is corresponding is positioned at the below of blackbody curve, can strengthen the quality of colour of white LED light source, promotes light environment effect.
In the present invention, the White-light LED illumination system of the specular quality that described color mixing designs method obtains, while raising white light preference, does not affect CRI performance indications, and has higher GAI index.
In the present invention, the White-light LED illumination system of the specular quality that described color mixing designs method obtains, colour temperature adjustable range is 2000 10000K.
In the present invention, the White-light LED illumination system of the specular quality that described color mixing designs method obtains, chromaticity coordinates point is to distance range 0.1≤Duv≤0 of blackbody curve.
In the present invention, the White-light LED illumination system of the specular quality that described color mixing designs method obtains, full gamut index GAI >=100 under each Duv of every color temperature.
The White-light LED illumination system of specular quality of the present invention has following advantage:
1, the present invention is by optimizing chromaticity coordinates point to the distance Duv of blackbody curve, has the LED colour mixture illuminator of high white light preference, can strengthen the quality of colour of white light source under obtaining required colour temperature, promotes Lighting Luminous Environment effect.Required colour rendering index CRI and higher full gamut index GAI can be guaranteed simultaneously, strengthen illuminated object color saturation.Experiment confirms its white light preference of White-light LED illumination system of specular quality of the present invention and the visual impact of illuminated object color is better than to the height colour developing ceramic gold-halogen lamp of identical colour temperature;
2, the present invention matches colors into the white light of chromaticity coordinates point corresponding to required Duv with the LED light source of four groups of different wave lengths.By solving singular value equation, obtain the LED proportioning that many groups meet chromaticity coordinates point, then when calculating different Duv, the relation of LED proportioning and Photochromic Properties, by the White-light LED illumination system of the specular quality of testing when obtaining optimum Duv.The colour mixture computational methods that the present invention optimizes Duv are easy, and theory calculate is consistent with the actual optical color parameter recorded;
3, the White-light LED illumination system of specular quality of the present invention by optimizing Duv color mixing designs and obtaining, colour temperature adjustable range is 2000 10000K, chromaticity coordinates point to distance range 0.1≤Duv≤0 of blackbody curve, full gamut index GAI >=100.
Accompanying drawing explanation
Fig. 1 is the chromaticity coordinates point to blackbody curve different distance in isotemperature line of the present invention.
RGB ratio when Fig. 2 is the different Duv obtained by color mixing designs method of the present invention and the graph of a relation of CRI/GAI index.
Fig. 3 is the spectrogram of ceramic gold-halogen lamp for testing of the present invention and eight kinds of LED light sources.
Fig. 4 is that the observer that obtains of experiment of the present invention is to the average experiment result of light color preference.
Fig. 5 is that the observer that obtains of experiment of the present invention is to the eye impressions of light color.
Fig. 6 is that the observer that obtains of experiment of the present invention is to the average experiment result of the bright-colored degree of illuminated object.
Fig. 7 is that the observer that obtains of experiment of the present invention is to the average experiment result of illuminated object color preference.
Detailed description of the invention
Below in conjunction with drawings and Examples, the present invention will be further described.Described embodiment is only section Example of the present invention.Do not make other all embodiments of creative achievement based on the embodiment in the present invention, all belong to protection scope of the present invention.
The white light LEDs of three primary colors RGB and any colour temperature is mixed to get the White-light LED illumination system of the specular quality optimizing Duv by the present invention, by PWM dimming mode, changes the light output intensity often organizing LED, is mixed to get the white light of required Duv.Concrete method for designing comprises the following steps:
Step 1: the colour temperature required for setting White-light LED illumination system, then tries to achieve the chromaticity coordinates of this colour temperature white light corresponding on blackbody curve in CIE1931 color gamut space.Carry out curve simulation with the blackbody curve chromaticity coordinates point of mathematical software to different temperatures, obtain the polynomial function of blackbody curve.The isotemperature line linear equation of required colour temperature can be tried to achieve according to the chromaticity coordinates point of required colour temperature and blackbody curve polynomial function
y=kx+b；
Step 2: get the point that several arrive blackbody curve different distance scope in this isotemperature line, such as, Duv=0,0.005,0.01,0.015,0.02
...0.1 etc., as Fig. 1, and then try to achieve these according to the linear equation of isotemperature line and put corresponding chromaticity coordinates;
Step 3: the white light LEDs selecting three primary colors (RGB) red-light LED, green-yellow light LED, blue-ray LED to add fluorescent material conversion carrys out the white light needed for mixed light generation.For the chromaticity coordinates point of different Duv, meet R, G, B of chromaticity coordinates point and the ratio of white light LEDs with singular value equation solution;
Step 4: calculate CRI and the GAI index under different proportion.Fig. 2 is LED white lumination system, the RGB ratio when different Duv and the linear relationship curve between CRI/GAI of 3000K for colour temperature.As seen from the figure, under identical colour temperature, when changing chromaticity coordinates point to blackbody curve distance, GAI index increases with Duv absolute value and significantly increases.According to required optical color parameter, select corresponding RGB and white light LEDs ratio, deisgn product.
Below by concrete experimental results, the impact of the White-light LED illumination system of the different Duv distance of the present invention on white light preference and illuminated object color is described.According to the relation curve of the RGB ratio in Fig. 2 during different Duv and CRI/GAI, the LED light source of eight kinds of canonical parameters is selected to test, relatively when identical colour temperature, identical colour rendering index, there is the LED light source of different Duv on the white light preference of observer and the impact on illuminated object color.LED light source uses the OSLONSSL lamp pearl of Osram, and adopt PWM light modulation, control the light output intensity of each group of LED, optimal design obtains the LED light source of required optical color parameter.The ceramic gold-halogen lamp with high color rendering index (CRI) of identical colour temperature is as reference light source.The spectrum of ceramic gold-halogen lamp (HID) and eight kinds of LED light sources is obtained, as shown in Figure 3 with integration sphere light source system measurement.The look parameter obtained thus, comprises colour temperature, colour rendering index, full gamut index, chromaticity coordinates, as shown in table 1.
Table 1LED light source parameters
。
In two rooms, ceramic gold-halogen lamp and LED are installed respectively, compare the light color in these two rooms and people to the preference of light.And select the clothes of 6 kinds of different colours, comprise typical color in white, redness, yellow, these six kinds of CIE1976Lab color gamut space orange, blue, green, these clothes are hung in this two rooms, and research light is on the impact of illuminated object color.Regulate the luminous flux of light source, ensure that the brightness in these two rooms is all identical with the illuminance on clothes.20 observers carry out marking evaluation to light color and every part clothes color, comprise their preference to light color and the eye impressions to light, the white light such as sent with HID is compared, and the white light that LED sends looks it is pure white light, still partially red, partially yellow, partially green, partially blue.Observer also needs to evaluate the preference of color the vividness of clothes color and they, and mark is from 3 to+3.On the occasion of expression under LED is irradiated, white light preference and by according to the vividness of clothes color and observer better than ceramic gold-halogen lamp to the preference of color; Negative value represents under LED is irradiated, white light preference and by according to the vividness of clothes color and the preference of observer to color poorer than ceramic gold-halogen lamp; 0 represents under LED and ceramic metal halide light irradiation, white light preference and by according to the vividness of clothes color and observer to the preference indifference of color.
Fig. 4 is the average experiment result of observer to light color preference.Can see, although ceramic gold-halogen lamp is all identical with the colour temperature of the LED of different parameters, observer more preference chromaticity coordinates point is positioned at the white light that the LED below blackbody curve sends.Fig. 5 is the eye impressions of observer to the white light that LED under different Duv sends.When chromaticity coordinates point is on blackbody curve, observer thinks that LED light is partially yellow/partially green, and along with chromaticity coordinates point increases to black body radiation distance, LED light is partially red/partially blue.The white light of observer's more preference reddish blue, when they think that white light is partially red/partially blue, seems whiter.Fig. 6 and Fig. 7 is observer to the average experiment result of the bright-colored degree of illuminated object and preference respectively.Can see, for the LED with high GAI index, all good than ceramic gold-halogen lamp to the radiation response of color, and along with the increase of GAI index, the preference of bright-colored degree and observer strengthens.So by optimizing the White-light LED illumination system that chromaticity coordinates point obtains to the distance of blackbody curve, the Lighting Luminous Environment created is to the eye impressions of people and the ceramic gold-halogen lamp visual performance ability of object color being better than to the most frequently used high color rendering index (CRI) of current high-end shops, the quality of colour of white light source can be strengthened, promote light environment effect, strengthen illuminated object color saturation and vividness simultaneously, improve the preference of people.
bibliography
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13(7),4(2013).
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Claims (5)
1. a method for designing for the White-light LED illumination system of specular quality, is characterized in that: by chromaticity coordinates point in optimization CIE1931 color gamut space to the distance Duv of blackbody curve, the LED illumination System of high white light preference under obtaining required colour temperature; Concrete steps are as follows:
Step 1: the colour temperature required for setting White-light LED illumination system, then tries to achieve the chromaticity coordinates of this colour temperature white light corresponding on blackbody curve in CIE1931 color gamut space; Carry out curve simulation with the blackbody curve chromaticity coordinates point of mathematical software to different temperatures, obtain the polynomial function of blackbody curve; According to chromaticity coordinates point and the blackbody curve polynomial function of required colour temperature, try to achieve the isotemperature line linear equation of required colour temperature:
y=kx+b；
Step 2: get several points in this isotemperature line, each point is different to the distance Duv of blackbody curve, and then tries to achieve chromaticity coordinates corresponding to these points according to the Duv distance of isotemperature line linear equation and setting;
Step 3: the white light LEDs that described LED illumination System selects three primary colors red-light LED, green-yellow light LED, blue-ray LED and fluorescent material to change carrys out the white light needed for mixed light generation; For the chromaticity coordinates point of different Duv, R, G, B of this chromaticity coordinates point and the ratio of white light LEDs is met with singular value equation solution, and colour rendering index CRI under calculating different proportion and full gamut index GAI, obtain the linear relationship curve between RGB ratio when different Duv and CRI/GAI;
Step 4: select corresponding RGB and the ratio of white light LEDs according to required Photochromic Properties CRI and GAI on curve, adopts pulse width modulated dimmer often to be organized light output intensity needed for LED, deisgn product, obtains White-light LED illumination system during different Duv;
Step 5: the light color of the white light that the white light LEDs of experiment test observer to different Duv sends and the subjective feeling of illuminated object color, the LED illumination System with high white light preference of the Duv be optimized and correspondence.
2. the White-light LED illumination system of the specular quality obtained by method for designing according to claim 1, is characterized in that: while raising white light preference, do not affect CRI performance indications, and have higher GAI index.
3. the White-light LED illumination system of specular quality according to claim 2, is characterized in that: colour temperature adjustable range is 2000 10000K.
4. the White-light LED illumination system of specular quality according to claim 2, is characterized in that: the chromaticity coordinates point of white light is to distance range 0.1≤Duv≤0 of blackbody curve.
5. the White-light LED illumination system of specular quality according to claim 2, is characterized in that: full gamut index GAI >=100 of the white light LEDs that colour mixture obtains under each Duv of every color temperature.
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| CN106384017A (en) * | 2016-11-02 | 2017-02-08 | 广东省半导体产业技术研究院 | White-light LED design method and lamp with high light color quality |
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