CN104749112B - Method for virtually realizing LED (Light Emitting Diode) effect by use of luminescent spectrum - Google Patents

Abstract

The invention relates to a method for virtually realizing LED (Light Emitting Diode) effect by use of luminescent spectrum, relating to the LEDs. The method comprises the following steps: calculating the chromaticity according to the luminescent spectrum of a luminous material and labeling in a CIE1913 chromaticity diagram; calculating relative sizes of RGB (red green blue) components; selecting a gaussian function; calculating the spatial RGB display intensity distribution; and displaying a luminescent image virtually realizing the LED effect by use of the luminescent spectrum. The method overcomes a defect that the effect of the prepared LED can be measured finally after the LED is manufactured by the luminous material in the prior art.

Description

A kind of method of luminescent spectrum virtual LED effect

Technical field

Technical scheme is related to light emitting diode (LED), specifically a kind of luminescent spectrum virtual LED effect Method.

Background technology

Now, LED becomes the main flow of illuminating engineering, and development of new luminescent material is to improve the brightness of LED and change it The key of colourity, can the colourity of material emission be to characterize it apply the principal element on LED.At present, weigh luminescent material Colourity is through having frequently with method：Measure the luminescent spectrum of luminescent material, calculate colourity and be labelled with CIE1931 chromaticity diagram Characterization.CN102539406A disclose LED luminescent material photochromic with spectral detection system and its method, detection LED lights Material conversion efficiency and colorimetric characteristics, and the four arithmetic operation using spectrum and the photochromic computing of simulation, analyze each independent induction Blue spectrum and luminescent spectrum.CN103411679A discloses the colourity optical detection system using microprocessor, according to conversion Linear electrical parameters calculates color table indicating value data-measuring.In Journal of Luminescence (143,2013：71–74) With Journal of Alloys and Compounds (2015,620：263 268) employ mark in CIE1931 chromaticity diagram Characterization, for characterizing the colourity developing white light LEDs luminescent materials.Disclosed above weighs showing of luminescent material colourity Have technology there is problems that：Measure the luminescent spectrum of luminescent material, calculate colourity and mark it in CIE1931 chromaticity diagram Position is although the colourity of luminescent material can be reflected, but sends out in mark and mono- region of LED in CIE1931 chromaticity diagram Light has differences, and more importantly the center of LED emergent light cross section lights the most by force, is gradually reduced away from central light strength, In CIE1931 chromaticity diagram mark just visually can not reflect before being developed into LED with luminescent material this luminescent material Lai Develop the LED effect that obtains that is to say, that using existing disclosed prior art can only by luminescent material be developed into LED it Afterwards, prepared LED effect could finally be measured, this will be an impediment to the research and development of New LED luminescent material.

Content of the invention

The technical problem to be solved is：There is provided a kind of method of luminescent spectrum virtual LED effect, according to luminous The spectrum of material, calculates colourity and marks in CIE1931 chromaticity diagram, determine three component relative sizes of RGB (RGB), Select Gaussian function, obtain the spatial distribution of RGB colour developing light intensity, and then just from luminous before be developed into LED with luminescent material Spectrum virtual LED effect, thus predicting with whether the LED of this luminescent material preparation meets requirement, the method overcomes use Prior art after luminescent material is developed into LED, could can only finally measure the defect of the LED effect of preparation.

The present invention solves this technical problem and be employed technical scheme comprise that：A kind of method of luminescent spectrum virtual LED effect, According to the spectrum of luminescent material, calculate colourity and mark in CIE1931 chromaticity diagram, determine tri- component relative sizes of RGB, Select Gaussian function, obtain the spatial distribution of RGB colour developing light intensity, that is, luminescent spectrum virtual LED effect, comprises the following steps that：

The first step, the luminescent spectrum according to luminescent material calculates colourity and marks in CIE1931 chromaticity diagram：

According to luminescent spectrum power I (λ) of luminescent material, using formula (1)～(3) calculate color tristimulus values X, Y and Z, then obtains chromaticity coordinate x, y and z by formula (4)～(6),

In above-mentioned formula,WithRepresent CIE1931 standard colorimetric observer's color matching function, x, y and z represent Chromaticity coordinate in CIE1931 chromaticity diagram, abbreviation chromaticity coordinate, marked in CIE1931 chromaticity diagram according to chromaticity coordinate (x, y) The luminescent chromaticity of luminescent material, determines its corresponding color that lights；

Second step, calculates the relative size of tri- components of RGB：

After the first step calculates chromaticity coordinate x, y and z, according to ITU709 and Chinese rower GY155, formula (7) is given The relative size ρ of tri- components of RGB_R, ρ_GAnd ρ_BRelation and chromaticity coordinate x, y and z between,

3rd step, chooses Gaussian function：

LED centre of luminescence injected carrier density is more than border area and the optical texture of LED can cause lighting of LED The light intensity at exit facet center is the strongest, assumes downward trend away from luminous exit facet central light strength, with Gaussian function formula (8) description The change of light intensity,

Wherein A is the amplitude of Gaussian function, and adjusting the size of amplitude A of Gaussian function, can to change luminescent spectrum virtual The brightness of LED, but it is affected by the restriction of the weakest and the strongest display brightness, the amplitude A needing to select Gaussian function is luminescent spectrum Virtual LED effect between the weakest and the strongest display brightness, LED outgoing cylindrical symmetric beam, luminescent spectrum virtual LED effect use The central point in region is o, and r is the distance of luminescent spectrum virtual LED effect point position and central point o position, and σ is Gaussian function mark Quasi- deviation, selection radius is R₀Border circular areas luminescent spectrum virtual LED effect, this region is the length of side is 2R₀Foursquare maximum Inscribed circle, using R₀Respectively to luminescent spectrum virtual LED effect point position and central point o position apart from r and Gaussian function Standard deviation is normalized, and formula (8) is melted into,

4th step, calculates RGB display Strength Space distribution：

(9) of the formula (7) in conjunction with second step and the 3rd step can obtain three components that RGB shows Strength Space distribution P_R、P_GAnd P_B,

Formula (10), (11) and (12) shows, the relative size ρ to tri- components of RGB_R, ρ_GAnd ρ_BAll it is multiplied by identical Gauss Function F (r), obtains three component P that RGB shows Strength Space distribution_R、P_GAnd P_BAlthough RGB display intensity is under radial direction has The trend of fall, but tri- component P of RGB of Strength Space distribution are shown in RGB_R、P_GAnd P_BBetween ratio constant, corresponding colourity Identical；

5th step, the luminescent image of display luminescent spectrum virtual LED effect：

Show three component P of Strength Space distribution with RGB_R、P_GAnd P_BThree kinds of colors of control display is strong respectively Degree, and be 2R in the length of side₀Foursquare maximum inscribed circle in display luminescent spectrum virtual LED effect luminescent image.

Above-mentioned ITU is the english abbreviation of International Telecommunication Union.

The invention has the beneficial effects as follows：Compared with prior art, the prominent substantive distinguishing features of the present invention and marked improvement As follows：

(1) prior art is passed through to measure the luminescent spectrum of luminescent material, is calculated colourity and in the acceptance of the bid of CIE1931 chromaticity diagram Note its position although the colourity of luminescent material can be reflected, but local very little demarcation field color image is inconspicuous, and this Inventive method is finally luminescent spectrum virtual LED effect, and display LED luminescent chromaticity is more directly perceived, is highlighted luminescent material Prepared LED effect.

(2) in prior art, luminescent material could observe its effect only after being successfully prepared LED, and the present invention with Before luminescent material is developed into LED, the spectrum according to developed luminescent material just can fictionalize the LED effect that will be obtained, by This judges that can this LED effect meet design requirement.

(3) luminescent spectrum adopting luminescent material in prior art calculates luminescent chromaticity, is a fixed constant, and this Bright employing Gaussian function shows luminescent material colourity in display plane, and the colourity of every bit does not change, and remains former Carry out the colourity of every bit, but be as showing three component P of Strength Space distribution away from display centre RGB_R、P_GAnd P_BGradually Reduce, the outgoing luminous power with the luminous exit facet center of virtual LED is high and surrounding power is low.

(4) luminescent spectrum adopting luminescent material in prior art calculates luminescent chromaticity, is a fixed constant, and this The amplitude A of bright use Gaussian function can be adjusted, and reach the purpose of virtual LED outgoing difference light intensity, do not change virtual simultaneously The colourity of LED emergent light.

(5) luminescent spectrum adopting luminescent material in prior art calculates luminescent chromaticity, is a fixed constant, and this The bright LED effect that can adjust Gaussian function standard deviation, reach the virtual difference angle of divergence, does not change virtual LED simultaneously Colourity.

(6) present invention adopts ITU709 and Chinese rower GY155, calculates tri- component relative size ρ of RGB_R, ρ_GAnd ρ_BWith Relation between chromaticity coordinate x, y and z, has versatility.

(7) present invention is calculated colourity, is chosen Gaussian function and then obtain RGB colour developing by the luminescent spectrum of luminescent material The spatial distribution of light intensity, that is, luminescent spectrum virtual LED effect, simple to operate, easily realizes, has versatility.

(8) instant invention overcomes could finally can only be measured after luminescent material is developed into LED using prior art Go out the defect of prepared LED effect.

Brief description

The present invention is further described with reference to the accompanying drawings and examples.

Fig. 1 is the operating process schematic block diagram of the inventive method.

Fig. 2 is the region and polar coordinate schematic block diagram that the inventive method luminescent spectrum virtual LED effect uses.

Fig. 3 by the inventive method luminescent spectrum virtual LED effect adopted Journal of Luminescence (143, 2013：71 74) spectrogram of luminescent material.

Fig. 4 marks the colourity of luminescent material used by Fig. 3 for the inventive method in CIE1931 chromaticity diagram.

Fig. 5 dissipates the Gaussian function curve chart of corner LED effect selection for the inventive method luminescent spectrum virtual high brightness width.

Fig. 6 dissipates the luminescent image of corner LED effect for the inventive method luminescent spectrum virtual high brightness width.

Fig. 7 dissipates the Gaussian function curve chart of corner LED effect selection for the inventive method luminescent spectrum virtual low-light level width.

Fig. 8 dissipates the luminescent image of corner LED effect for the inventive method luminescent spectrum virtual low-light level width.

Fig. 9 is the virtual narrow Gaussian function curve chart dissipating the selection of corner LED effect of the inventive method luminescent spectrum.

Figure 10 is the narrow luminescent image dissipating corner LED effect of the virtual high brightness of the inventive method luminescent spectrum.

In figure, the square area that 201. luminescent spectrum virtual LED effects use, 202. luminescent spectrum virtual LED effects Maximum inscribed circle in square area, the radius r circle of 203. luminescent spectrum virtual LED effects, 301. luminescent spectrum virtual LED effects The luminescent spectrum of the luminescent material that fruit is used, 401.CIE1931 chromaticity diagram periphery envelope, 501. luminescent spectrum luminescent materials High brightness width dissipates the Gaussian function of corner LED effect selection, and 701. luminescent spectrums virtual low-light level width dissipates corner LED effect and chooses Gaussian function, the virtual high brightness of 901. luminescent spectrums is narrow to dissipate the Gaussian function of corner LED effect selection；

In figure, coordinate unit is meant that：I is the normalized intensity of the luminescent spectrum of luminescent material, and a.u. is luminous material The relative unit of the normalized intensity of luminescent spectrum of material, F (r) is the Gaussian function that luminescent spectrum virtual LED effect is chosen, R₀ For the border circular areas maximum radius of luminescent spectrum virtual LED effect, o is the viewing area center of luminescent spectrum virtual LED effect Point, r is the distance of luminescent spectrum virtual LED effect point position and central point o, e_xAnd e_yChoose for luminescent spectrum virtual LED effect Two coordinate axess in region, r/R₀Distance for normalization luminescent spectrum virtual LED effect point position and central point o.

Specific embodiment

Embodiment illustrated in fig. 1 shows, the operating process of the present invention is：Luminescent spectrum according to luminescent material calculates colourity simultaneously In CIE1931 chromaticity diagram, the relative size → selection Gaussian function → calculating RGB of mark → calculating tri- components of RGB shows by force The luminescent image of degree spatial distribution → display luminescent spectrum virtual LED effect.

The present invention is to calculate colourity and in the demarcation of CIE1931 chromaticity diagram according to luminescent spectrum, obtains tri- components of RGB relatively Size, the Gaussian function in conjunction with selection calculates RGB display Strength Space distribution, and final realization only predicts preparation according to spectrum to be made LED effect obtained by luminescent material.

Embodiment illustrated in fig. 2 shows use region and the polar coordinate of luminescent spectrum virtual LED effect, shows for rectangular In the display of shape, commonly used regular domain display image, that is, select the square region that luminescent spectrum virtual LED effect uses Domain 201, in luminescent spectrum virtual LED effect square area in this square area, maximum inscribed circle 202 is corresponding luminous The border circular areas maximum radius of spectrum virtual LED effect is R₀, observe the viewing area central point of luminescent spectrum virtual LED effect For o, r is the distance of luminescent spectrum virtual LED effect point position and central point o, is constituted circle for the center of circle by radius r with central point o 203, the requirement of description LED circular exit light distribution is met using the circular symmetry of polar coordinate system.

In luminescent spectrum virtual LED effect, in selected square area, maximum inscribed circle is display outgoing circular light bundle Maximum magnitude, after gamut, LED effect can not display completely, in r=R₀When, luminescent spectrum virtual LED effect Decay is approximately to zero.

Embodiment illustrated in fig. 3 shows that luminescent spectrum virtual LED effect of the present invention adopts Journal of Luminescence (143,2013：71 74) spectrogram of luminescent material.

The spectrum of luminescent material is the primary data of luminescent spectrum virtual LED effect, is calculating colourity and luminescent spectrum void Intend LED effect requirements spectrum complete, spectroscopic data covers visible wavelength range, can be in the range of three primary colours RGB comprise Luminescent spectrum virtual LED effect, other has no the spectrum particular/special requirement to luminescent material, selects Journal of in the present invention Luminescence (143,2013：71 74) in a kind of spectroscopic data of luminescent material as checking the present invention using effect, Using the measurement of other documents luminescent material spectroscopic data can the same process verification present invention using effect.

The luminescent spectrum 301 of the luminescent material that the luminescent spectrum virtual LED effect of display is used in Fig. 3, containing can See the material emission spectrum in light region, employ relative coordinates in document and show its spectral intensity, this curve of spectrum declines can See that in optical range, 3 peaks correspond to the transition between the corresponding energy state of electronics in luminescent material, for the light of material composition different materials Spectrum has differences, and the position of spectrum peak and intensity can change, and eye experiences the spectrum stimulus value of different wave length, constitutes Luminescent spectrum forms different colours in eye, calculates the instrument that colourity is reflection glow color, and these test luminescent material Spectrum be the committed step calculating colourity, only by the spectrum of real luminescent material, luminescent chromaticity could be calculated, and then Luminescent spectrum virtual LED effect.

Embodiment illustrated in fig. 4 shows, the luminescent material used by mark embodiment illustrated in fig. 3 in CIE1931 chromaticity diagram Spectrum chroma E point, using in CIE1931 chromaticity diagram mark luminescent material spectrum chroma be through frequently with method, make here With dividing zones of different with curve in CIE1931 chromaticity diagram, these zoness of different characterize colourity fall in this region corresponding Luminous color, in CIE1931 chromaticity diagram, envelope 401 is that human eye can differentiate visible ray chromaticity range, beyond envelope 401 eye-observations less than, CIE1931 chromaticity diagram mark " red ", " green " and " blue " represent that the corresponding point of colourity (x, y) falls respectively The corresponding glow color of colourity is respectively HONGGUANG, green glow and blue light in that region, in " white " expression of CIE1931 chromaticity diagram mark The corresponding point of colourity (x, y) the corresponding glow color of colourity in this region that falls is respectively white light, the chromaticity coordinate of white light field point , near 1/3, the curve between the two in CIE1931 chromaticity diagram " red ", " green ", " blue " and " white " surrounds region and is for x, y and z The transition color of both colors.The luminescent material that the present invention is used using the luminescent spectrum virtual LED effect in Fig. 3 send out It is (0.3132,0.3245) that light spectrum 301 is calculated colourity (x, y), is labeled as E point in CIE1931 chromaticity diagram, falls CIE1931 chromaticity diagram white light field.

Embodiment illustrated in fig. 5 shows that luminescent spectrum virtual high brightness width dissipates the Gaussian function of corner LED effect selection 501, wherein Gaussian function amplitude A is 2.9802, and Gaussian function standard deviation is 0.3R₀.

The wide Gaussian function 501 dissipating the selection of corner LED effect of the virtual high brightness of luminescent spectrum is at r=0 viewing area center Point o is maximum, and its size is 2.9802, equal to its amplitude A, in luminescent spectrum virtual LED effect square area Maximum inscribed circle 202 (see Fig. 2) place, the virtual high brightness of luminescent spectrum is wide dissipate the selection of corner LED effect Gaussian function 501 close 0, the Changing Pattern that the strongest surrounding in LED outgoing beam center gradually weakens can be reflected using Gaussian function, and there is circle Symmetry.

Embodiment illustrated in fig. 6 shows, the Gaussian function 501 using the selection luminescent spectrum virtual LED effect shown in Fig. 5 is real Existing luminescent spectrum virtual high brightness width dissipates the luminescent image of corner LED effect.

Dissipate in corner LED effect in luminescent spectrum virtual high brightness width, employ colourity (x, y) be (0.3132, 0.3245) represent that the luminescent chromaticity of virtual LED assumes white, gradually weaken with the brightness away from central area virtual LED, It is hacked color eventually to surround, can reflect that luminescent spectrum virtual high brightness width angle of divergence white light LEDs show the effect of colourity.But LED, under different shooting conditions, shows different brightness, and the different LED structure emergent light angles of divergence are also different, consequent LED effect is also different, and comparing Fig. 6, Fig. 8 and Figure 10 can be confirmed.

Embodiment illustrated in fig. 7 shows that luminescent spectrum virtual low-light level width dissipates the Gaussian function of corner LED effect selection 701, wherein Gaussian function amplitude A is 1.4901, and Gaussian function standard deviation is 0.3R₀.

The wide Gaussian function 701 dissipating the selection of corner LED effect of the virtual low-light level of luminescent spectrum is at r=0 viewing area center Point o is maximum, and its size is 1.4901, equal to its amplitude A, in luminescent spectrum virtual LED effect square area Maximum inscribed circle 202 (see Fig. 2) place, the Gaussian function 701 that luminescent spectrum virtual LED effect is chosen is close to 0.With sending out in Fig. 5 The wide Gaussian function 501 dissipating the selection of corner LED effect of the virtual high brightness of light spectrum contrasts, and luminescent spectrum in the figure 7 is virtual low Wide Gaussian function 701 amplitude A dissipating the selection of corner LED effect of brightness reduces one times, sends out with luminescent spectrum virtual low-light level width The corresponding light intensity of Gaussian function 701 that scattered corner LED effect is chosen is compared luminescent spectrum virtual luminance width and is dissipated the choosing of corner LED effect One times of the Gaussian function 501 luminescent spectrum virtual LED light intensity decreasing that takes.

Embodiment illustrated in fig. 8 shows, the Gaussian function 701 using the selection luminescent spectrum virtual LED effect shown in Fig. 7 is real Existing luminescent spectrum virtual high brightness width dissipates the luminescent image of corner LED effect.

Dissipate in corner LED effect in luminescent spectrum virtual low-light level width, employ colourity (x, y) be (0.3132, 0.3245) represent that the luminescent chromaticity of luminescent spectrum virtual LED assumes white, but the virtual low-light level of luminescent spectrum due to using Wide Gaussian function 701 (see Fig. 7) amplitude dissipating the selection of corner LED effect reduces, and therefore center brightness substantially dies down, with Fig. 6 phase The LED luminance of Fig. 8 luminescent spectrum virtual low-light level width angle of divergence is dark, corresponding to low-light level width angle of divergence white light LEDs effect for ratio Really, under low shooting condition, LED output light weakens, likewise as the long-time increase using of LED or cause LED damaged condition Under, LED output light shows attenuation trend.

Embodiment illustrated in fig. 9 shows the narrow Gaussian function dissipating the selection of corner LED effect of the virtual high brightness of luminescent spectrum 901, wherein Gaussian function amplitude A is 2.9802, and Gaussian function standard deviation is 0.1R₀.

The narrow Gaussian function 901 dissipating the selection of corner LED effect of the virtual high brightness of luminescent spectrum is at r=0 viewing area center Point o is maximum, and its size is 2.9802, equal to its amplitude A, dissipates corner LED because the virtual high brightness of luminescent spectrum is narrow in Fig. 9 The Gaussian function standard deviation of the Gaussian function 901 that effect is chosen is 0.1R₀Hence it is evident that it is virtual highlighted less than luminescent spectrum in Fig. 5 In the wide Gaussian function 501 dissipating the selection of corner LED effect of degree and Fig. 7, luminescent spectrum virtual low-light level width dissipates the choosing of corner LED effect The Gaussian function 701 taking, with the increase apart from r of luminescent spectrum virtual LED effect point position and central point o, luminous in Fig. 9 The narrow Gaussian function 901 functional value decrease speed dissipating the selection of corner LED effect of the virtual high brightness of spectrum is significantly greater than luminous in Fig. 5 The wide Gaussian function 501 dissipating the selection of corner LED effect of the virtual high brightness of spectrum.The fast virtual high brightness of luminescent spectrum of this decline The narrow Gaussian function 901 dissipating the selection of corner LED effect is used for description, and high brightness is narrow dissipates corner LED effect.

Embodiment illustrated in fig. 10 shows, using the Gaussian function 901 of the selection luminescent spectrum virtual LED effect shown in Fig. 9 Realize the luminescent image that luminescent spectrum virtual high brightness width dissipates corner LED effect.

Dissipate in corner LED effect the virtual high brightness of luminescent spectrum is narrow, employ colourity (x, y) be (0.3132, 0.3245) represent that the luminescent chromaticity of luminescent spectrum virtual LED assumes white, but due to using the virtual height of luminescent spectrum in Fig. 9 The narrow Gaussian function 901 dissipating the selection of corner LED effect of brightness, with luminescent spectrum virtual LED effect point position with central point o's Apart from the increase of r, the function value of the narrow Gaussian function 901 dissipating the selection of corner LED effect of the virtual high brightness of luminescent spectrum declines Speed is significantly greater than the narrow Gaussian function 501 (see Fig. 5) dissipating the selection of corner LED effect of the virtual high brightness of luminescent spectrum, luminous light The brightness of spectrum virtual LED weakens quickly, and compared with Fig. 6, in Figure 10, luminescent spectrum virtual LED colourity is hacked color in short distance Surround, exactly the virtual high brightness of luminescent spectrum is narrow dissipates corner LED effect for this.

Embodiment 1

The present embodiment dissipates in corner LED effect in luminescent spectrum virtual high brightness width, employ Gaussian function amplitude A= 2.9802, Gaussian function standard deviation=0.3R₀, chromaticity coordinate (x, y) is the luminous material that (0.3132,0.3245) is white light Material.

The comprising the following steps that of the present embodiment：

The first step, calculates colourity according to luminescent material spectrum and marks in CIE1931 chromaticity diagram：

Calculate tristimulus values X, Y and the Z value of color according to luminescent material spectral power I (λ) using formula (1)～(3), Then chromaticity coordinate x, y and z are obtained by formula (4)～(6),

In above-mentioned formula,WithRepresent CIE1931 standard colorimetric observer's color matching function, have chosen in Fig. 3 301 spectrum I (λ), are calculated chromaticity coordinate x, y by formula (1)～(6) and z are respectively 0.3132,0.3245 and 0.3623, I.e. corresponding chromaticity coordinate (x, y) is (0.3132,0.3245), shows mark Fig. 3 institute in CIE1931 chromaticity diagram in Fig. 4 Show the spectrum chroma E point of the luminescent material used by the present embodiment, fall in CIE1931 chromaticity diagram white light field, three primary colours can be used Display.

Second step, calculates tri- component relative sizes of RGB

After the first step calculates chromaticity coordinate x, y and z, according to ITU709 and Chinese rower GY155, formula (7) is given Tri- component relative size ρ of RGB_R, ρ_GAnd ρ_BRelation and chromaticity coordinate x, y and z between,

By x=0.3132, y=0.3245 and z=0.3623 substitutes into formula (7) and obtains,

Can determine tri- component relative size ρ of RGB_R, ρ_GAnd ρ_BIt is respectively 0.3355,0.3202 and 0.3342；

3rd step, chooses Gaussian function：

LED centre of luminescence injected carrier density is more than border area and the optical texture of LED can cause lighting of LED The light intensity at exit facet center is the strongest, assumes downward trend away from luminous exit facet central light strength, with Gaussian function formula (8) description The change of light intensity,

Wherein A is the amplitude of Gaussian function, and adjusting the size of amplitude A of Gaussian function, can to change luminescent spectrum virtual The brightness of LED, but it is affected by the restriction of the weakest and the strongest display brightness, the amplitude A needing to select Gaussian function is luminescent spectrum Virtual LED effect between the weakest and the strongest display brightness, LED outgoing cylindrical symmetric beam, luminescent spectrum virtual LED effect use The central point in region is o, and r is the distance of luminescent spectrum virtual LED effect point position and central point o position, and σ is Gaussian function mark Quasi- deviation, selection radius is R₀Border circular areas luminescent spectrum virtual LED effect, this region is the length of side is 2R₀Foursquare maximum Inscribed circle, using R₀Respectively to luminescent spectrum virtual LED effect point position and central point o position apart from r and Gaussian function Standard deviation is normalized, and formula (8) is melted into,

This example demonstrates that, the wide Gaussian function 501 dissipating the selection of corner LED effect of the virtual high brightness of luminescent spectrum is used for sending out Light spectrum virtual high brightness width dissipates corner LED effect, and wherein Gaussian function amplitude A is 2.9802, and Gaussian function standard deviation is 0.3R₀, then formula (9) can obtain,

(r=R in maximum inscribed circle 202 in luminescent spectrum virtual LED effect square area₀) place, luminous light Compose virtual high brightness wide dissipate corner LED effect selection Gaussian function 501 size be,

The 0.3859% (=0.0115/2.9802) being equivalent to center intensity, close to 0, can be reflected using Gaussian function The Changing Pattern gradually weakening around LED outgoing beam center is the strongest, and there is circular symmetry；

4th step, calculates RGB display Strength Space distribution：

Three component P that RGB shows Strength Space distribution can be obtained in conjunction with formula (7) and (9)_R、P_GAnd P_B,

Here tri- component relative size ρ of RGB_R=0.3355, ρ_G=0.3202 and ρ_B=0.3342, Gaussian function amplitude A =2.9802, Gaussian function standard deviation=0.3R₀Substitute into formula (10)～(12) to obtain,

To tri- component relative size ρ of RGB_R, ρ_GAnd ρ_BAll it is multiplied by identical Gaussian function F (r), obtain RGB display intensity empty Between distribution three component P_R、P_GAnd P_BAlthough RGB display intensity has a declining tendency in radial direction, but show intensity in RGB Three component P of spatial distribution_R、P_GAnd P_BBetween ratio constant, correspondence constant to colourity；

5th step, the luminescent image of display luminescent spectrum virtual LED effect：

Show three component P of Strength Space distribution with RGB_R、P_GAnd P_BThree kinds of colors of control display is strong respectively Degree, and be 2R in the length of side₀Foursquare maximum inscribed circle (i.e. maximum in luminescent spectrum virtual LED effect square area Inscribed circle 202) the interior luminescent image showing luminescent spectrum virtual LED effect.The present embodiment is 2R in the length of side₀Foursquare Display luminescent spectrum virtual LED in big inscribed circle (i.e. maximum inscribed circle 202 in luminescent spectrum virtual LED effect square area) The luminescent image of effect is shown in Fig. 6.

The present embodiment dissipates in corner LED effect in luminescent spectrum virtual high brightness width, employ Gaussian function amplitude A= 2.9802, Gaussian function standard deviation=0.3R₀, chromaticity coordinate (x, y) is the luminous material that (0.3132,0.3245) is white light The LED luminescent spectrum virtual LED effect of material, gradually weakens with the brightness away from central area luminescent spectrum virtual LED, finally Be hacked color surround, reflect high brightness width angle of divergence white light LEDs effect, however LED in different shooting conditions to show not Brightness together, long-time use will also result in LED output light and weakens, and the equally different LED structure emergent light angles of divergence have differences. Example below 2 luminescent spectrum virtual LED effect chromaticity coordinate (x, y) same as Example 1 is sending out of (0.3132,0.3245) Luminescent material preparation low-light level width dissipates corner LED effect, and embodiment 3 luminescent spectrum virtual LED effect colourity same as Example 1 is sat Mark (x, y) is that the luminescent material of (0.3132,0.3245) prepares that high brightness is narrow to dissipate corner LED effect.

Embodiment 2

The present embodiment dissipates in corner LED effect in luminescent spectrum virtual low-light level width, employ Gaussian function amplitude A= 1.4901, Gaussian function standard deviation=0.3R₀, chromaticity coordinate (x, y) is the luminous material that (0.3132,0.3245) is white light Material.

The comprising the following steps that of the present embodiment：

The first step and second step are same as Example 1, be calculated chromaticity coordinate x, y and z is respectively 0.3132,0.3245 With 0.3623, that is, corresponding chromaticity coordinate (x, y) is (0.3132,0.3245), is labeled as E point in CIE1931 chromaticity diagram, falls CIE1931 chromaticity diagram white light field, and obtain tri- component relative size ρ of RGB_R, ρ_GAnd ρ_BIt is respectively 0.3355,0.3202 and 0.3342；

3rd step, chooses Gaussian function：

LED centre of luminescence injected carrier density is more than border area and the optical texture of LED can cause lighting of LED The light intensity at exit facet center is the strongest, assumes downward trend away from luminous exit facet central light strength, with Gaussian function formula (8) description The change of light intensity,

Wherein A is the amplitude of Gaussian function, and adjusting the size of amplitude A of Gaussian function, can to change luminescent spectrum virtual The brightness of LED, but it is affected by the restriction of the weakest and the strongest display brightness, the amplitude A needing to select Gaussian function is luminescent spectrum Virtual LED effect between the weakest and the strongest display brightness, LED outgoing cylindrical symmetric beam, luminescent spectrum virtual LED effect use The central point in region is o, and r is the distance of luminescent spectrum virtual LED effect point position and central point o position, and σ is Gaussian function mark Quasi- deviation, selection radius is R₀Border circular areas luminescent spectrum virtual LED effect, this region is the length of side is 2R₀Foursquare maximum Inscribed circle, using R₀Respectively to luminescent spectrum virtual LED effect point position and central point o position apart from r and Gaussian function Standard deviation is normalized, and formula (8) is melted into,

This example demonstrates that, select the wide Gaussian function 701 dissipating the selection of corner LED effect of the virtual low-light level of luminescent spectrum to use Dissipate corner LED effect in luminescent spectrum virtual low-light level width, wherein Gaussian function amplitude A is 1.4901, Gaussian function standard deviation Difference σ is 0.3R₀, then formula (9) can obtain,

(r=R in maximum inscribed circle 202 in luminescent spectrum virtual LED effect square area₀) place, luminous light Compose virtual low-light level wide dissipate corner LED effect selection Gaussian function 701 size be,

The 0.3859% (=0.0576/1.4901) being equivalent to center intensity, close to 0, can be reflected using Gaussian function The Changing Pattern gradually weakening around LED outgoing beam center is the strongest, and there is circular symmetry；

4th step, calculates RGB display Strength Space distribution：

Three component P that RGB shows Strength Space distribution can be obtained in conjunction with formula (7) and (9)_R、P_GAnd P_B,

Here tri- component relative size ρ of RGB_R=0.3355, ρ_G=0.3202 and ρ_B=0.3342, Gaussian function amplitude A =1.4901, Gaussian function standard deviation=0.3R₀Substitute into formula (10)～(12) to obtain,

To tri- component relative size ρ of RGB_R, ρ_GAnd ρ_BAll it is multiplied by identical Gaussian function F (r), obtain RGB display intensity empty Between distribution three component P_R、P_GAnd P_BAlthough RGB display intensity has a declining tendency in radial direction, but show intensity in RGB Three component P of spatial distribution_R、P_GAnd P_BBetween ratio constant, corresponding colourity is identical；

5th step, the luminescent image of display luminescent spectrum virtual LED effect：

Show three component P of Strength Space distribution with RGB_R、P_GAnd P_BThree kinds of colors of control display is strong respectively Degree, and be 2R in the length of side₀Foursquare maximum inscribed circle (i.e. maximum in luminescent spectrum virtual LED effect square area Inscribed circle 202) the interior luminescent image showing luminescent spectrum virtual LED effect.The present embodiment is 2R in the length of side₀Foursquare Display luminescent spectrum virtual LED in big inscribed circle (i.e. maximum inscribed circle 202 in luminescent spectrum virtual LED effect square area) The luminescent image of effect is shown in Fig. 8.

The present embodiment dissipates in corner LED effect in luminescent spectrum virtual low-light level width, employ Gaussian function amplitude A= 1.4901, Gaussian function standard deviation=0.3R₀, chromaticity coordinate (x, y) is the luminous light that (0.3132,0.3245) is white light Spectrum virtual LED effect, gradually weakens with the brightness away from central area luminescent spectrum virtual LED, is finally hacked color and surrounds, Dissipate in corner LED effect in luminescent spectrum virtual high brightness width, employing colourity (x, y) is that (0.3132,0.3245) expression is sent out The luminescent chromaticity of light spectrum virtual LED assumes white, and compared with Fig. 6, Fig. 8 is sent out due to the luminescent spectrum virtual low-light level width using Gaussian function 701 Gaussian function that dissipate corner LED effect selection wider than the virtual high brightness of luminescent spectrum that scattered corner LED effect is chosen 501 amplitude reduces, and the LED luminance of the luminescent spectrum virtual low-light level width angle of divergence is dark, with low shooting condition and make With the increase of LED time or cause under LED damaged condition, LED shows the characteristic of brightness deterioration.

Embodiment 3

The present embodiment dissipates in corner LED effect the virtual high brightness of luminescent spectrum is narrow, employ Gaussian function amplitude A= 2.9802, Gaussian function standard deviation is 0.1R₀, chromaticity coordinate (x, y) is the luminous material that (0.3132,0.3245) is white light Material.

The comprising the following steps that of the present embodiment：

The first step and second step are same as Example 1, be calculated chromaticity coordinate x, y and z is respectively 0.3132,0.3245 With 0.3623, that is, corresponding chromaticity coordinate (x, y) is (0.3132,0.3245), is labeled as E point in chromaticity diagram CIE1931, falls CIE1931 chromaticity diagram white light field, and obtain tri- component relative size ρ of RGB_R, ρ_GAnd ρ_BIt is respectively 0.3355,0.3202 and 0.3342；

3rd step, chooses Gaussian function：

LED centre of luminescence injected carrier density is more than border area and the optical texture of LED can cause lighting of LED The light intensity at exit facet center is the strongest, assumes downward trend away from luminous exit facet central light strength, with Gaussian function formula (8) description The change of light intensity,

Wherein A is the amplitude of Gaussian function, and adjusting the size of amplitude A of Gaussian function, can to change luminescent spectrum virtual The brightness of LED, but it is affected by the restriction of the weakest and the strongest display brightness, the amplitude A needing to select Gaussian function is luminescent spectrum Virtual LED effect between the weakest and the strongest display brightness, LED outgoing cylindrical symmetric beam, luminescent spectrum virtual LED effect use The central point in region is o, and r is the distance of luminescent spectrum virtual LED effect point position and central point o position, and σ is Gaussian function mark Quasi- deviation, selection radius is R₀Border circular areas luminescent spectrum virtual LED effect, this region is the length of side is 2R₀Foursquare maximum Inscribed circle, using R₀Respectively to luminescent spectrum virtual LED effect point position and central point o position apart from r and Gaussian function Standard deviation is normalized, and formula (8) is melted into,

This example demonstrates that, select the narrow Gaussian function 901 dissipating the selection of corner LED effect of the virtual high brightness of luminescent spectrum to use Dissipate corner LED effect in luminescent spectrum virtual luminance is narrow, wherein Gaussian function amplitude A is 2.9802, Gaussian function standard deviation For 0.1R₀, then formula (9) can obtain,

(r=R in maximum inscribed circle 202 in luminescent spectrum virtual LED effect square area₀) place, luminous light Compose virtual high brightness narrow dissipate corner LED effect selection Gaussian function 901 size be,

Already close to 0, the change that the strongest surrounding in LED outgoing beam center gradually weakens can be reflected using Gaussian function Rule, and there is circular symmetry；

4th step, calculates RGB display Strength Space distribution：

Three component P that RGB shows Strength Space distribution can be obtained in conjunction with formula (7) and (9)_R、P_GAnd P_B,

Here tri- component relative size ρ of RGB_R=0.3355, ρ_G=0.3202 and ρ_B=0.3342, Gaussian function amplitude A =2.9802, Gaussian function standard deviation=0.1R₀Substitute into formula (10)～(12) to obtain,

To tri- component relative size ρ of RGB_R, ρ_GAnd ρ_BAll it is multiplied by identical Gaussian function F (r), obtain RGB display intensity empty Between distribution three component P_R、P_GAnd P_BAlthough RGB display intensity has a declining tendency in radial direction, but show intensity in RGB Three component P of spatial distribution_R、P_GAnd P_BBetween ratio constant, corresponding colourity is identical；

5th step, the luminescent image of display luminescent spectrum virtual LED effect：

Show three component P of Strength Space distribution with RGB_R、P_GAnd P_BThree kinds of colors of control display is strong respectively Degree, and be 2R in the length of side₀Foursquare maximum inscribed circle (i.e. maximum in luminescent spectrum virtual LED effect square area Inscribed circle 202) the interior luminescent image showing luminescent spectrum virtual LED effect.The present embodiment is 2R in the length of side₀Foursquare Display luminescent spectrum virtual LED in big inscribed circle (i.e. maximum inscribed circle 202 in luminescent spectrum virtual LED effect square area) The luminescent image of effect is shown in Figure 10.

The present embodiment dissipates in corner LED effect the virtual high brightness of luminescent spectrum is narrow, employ Gaussian function amplitude A= 2.9802, Gaussian function standard deviation is 0.1R₀, chromaticity coordinate (x, y) is the luminous material that (0.3132,0.3245) is white light Material virtual LED effect, virtual LED colourity assumes white, with the increasing apart from r of virtual LED effect point position and central point o Plus, in Fig. 9 the virtual high brightness of luminescent spectrum narrow dissipate corner LED effect selection Gaussian function 901 functional value decrease speed obvious The Gaussian function 501 that dissipate corner LED effect selection wide more than the virtual high brightness of luminescent spectrum in Fig. 5, virtual away from central area The luminosity of LED weakens quickly, reflects the narrow characteristic dissipating corner LED colourity of high brightness.

Claims (1)

1. a kind of method of luminescent spectrum virtual LED effect it is characterised in that：According to the spectrum of luminescent material, calculate colourity And mark in CIE1931 chromaticity diagram, determine tri- component relative sizes of RGB, select Gaussian function, obtain RGB colour developing light intensity Spatial distribution, that is, luminescent spectrum virtual LED effect, comprises the following steps that：

The first step, the luminescent spectrum according to luminescent material calculates colourity and marks in CIE1931 chromaticity diagram：

According to luminescent spectrum power I (λ) of luminescent material, using formula (1)～(3) calculate color tristimulus values X, Y and Z, then obtains chromaticity coordinate x, y and z by formula (4)～(6),

$X=\underset{380}{\overset{780}{\∫}}I\left(\mathrm{\λ}\right)\stackrel{\‾}{x}\left(\mathrm{\λ}\right)d\mathrm{\λ}---\left(1\right)$

$Y=\underset{380}{\overset{780}{\∫}}I\left(\mathrm{\λ}\right)\stackrel{\‾}{y}\left(\mathrm{\λ}\right)d\mathrm{\λ}---\left(2\right)$

$Z=\underset{380}{\overset{780}{\∫}}I\left(\mathrm{\λ}\right)\stackrel{\‾}{z}\left(\mathrm{\λ}\right)d\mathrm{\λ}---\left(3\right)$

$x=\frac{X}{X+Y+Z}---\left(4\right)$

$y=\frac{Y}{X+Y+Z}---\left(5\right)$

$z=\frac{Z}{X+Y+Z}---\left(6\right)$

In above-mentioned formula,WithRepresent CIE1931 standard colorimetric observer's color matching function, x, y and z represent in CIE1931 Chromaticity coordinate in chromaticity diagram, abbreviation chromaticity coordinate, luminous material is marked in CIE1931 chromaticity diagram according to chromaticity coordinate (x, y) The luminescent chromaticity of material, determines its corresponding color that lights；

Second step, calculates the relative size of tri- components of RGB：

After the first step calculates chromaticity coordinate x, y and z, formula (7) provides the relative size ρ of tri- components of RGB_R, ρ_GAnd ρ_BWith Relation between chromaticity coordinate x, y and z,

$\left(\begin{array}{c}{\mathrm{\ρ}}_R\\ {\mathrm{\ρ}}_G\\ {\mathrm{\ρ}}_B\end{array}\right)=\left[\begin{array}{ccc}3.2410& -1.5374& -0.4986\\ -0.9692& 1.8760& 0.0416\\ 0.0556& -0.2040& 1.0570\end{array}\right]\left(\begin{array}{c}x\\ y\\ z\end{array}\right)---\left(7\right)$

3rd step, chooses Gaussian function：

LED centre of luminescence injected carrier density can cause the luminous outgoing of LED more than the optical texture of border area and LED The light intensity at face center is the strongest, assumes downward trend away from luminous exit facet central light strength, describes light intensity with Gaussian function formula (8) Change,

$F\left(r\right)=A\exp (-\frac{r^2}{2{\mathrm{\σ}}^2})---\left(8\right)$

Wherein A is the amplitude of Gaussian function, and the size adjusting the amplitude A of Gaussian function can change luminescent spectrum virtual LED Brightness, but it is affected by the restriction of the weakest and the strongest display brightness, the amplitude A needing to select Gaussian function is that luminescent spectrum is virtual LED effect between the weakest and the strongest display brightness, LED outgoing cylindrical symmetric beam, luminescent spectrum virtual LED effect uses region Central point be o, r is the distance of luminescent spectrum virtual LED effect point position and central point o position, and σ is Gaussian function standard deviation Difference, selection radius is R₀Border circular areas luminescent spectrum virtual LED effect, this region is the length of side is 2R₀Foursquare maximum inscribe Circle, using R₀Respectively to luminescent spectrum virtual LED effect point position and central point o position apart from r and Gaussian function standard Deviations are normalized, and formula (8) is melted into,

$F\left(r\right)=A\exp \[-\frac{{(r/R_0)}^2}{2{(\mathrm{\σ}/R_0)}^2}\]---\left(9\right)$

4th step, calculates RGB display Strength Space distribution：

(9) of the formula (7) in conjunction with second step and the 3rd step can obtain three component P that RGB shows Strength Space distribution_R、P_G And P_B,

$P_R={\mathrm{\ρ}}_{R}F\left(r\right)={\mathrm{\ρ}}_{R}A\exp \[-\frac{{(r/R_0)}^2}{2{(\mathrm{\σ}/R_0)}^2}\]---\left(10\right)$

$P_G={\mathrm{\ρ}}_{G}F\left(r\right)={\mathrm{\ρ}}_{G}A\exp \[-\frac{{(r/R_0)}^2}{2{(\mathrm{\σ}/R_0)}^2}\]---\left(11\right)$

$P_B={\mathrm{\ρ}}_{B}F\left(r\right)={\mathrm{\ρ}}_{B}A\exp \[-\frac{{(r/R_0)}^2}{2{(\mathrm{\σ}/R_0)}^2}\]---\left(12\right)$

Formula (10), (11) and (12) shows, the relative size ρ to tri- components of RGB_R, ρ_GAnd ρ_BAll it is multiplied by identical Gaussian function F (r), obtains three component P that RGB shows Strength Space distribution_R、P_GAnd P_BAlthough RGB display intensity has decline in radial direction Trend, but tri- component P of RGB of Strength Space distribution are shown in RGB_R、P_GAnd P_BBetween ratio constant, corresponding colourity is identical；

5th step, the luminescent image of display luminescent spectrum virtual LED effect：

Show three component P of Strength Space distribution with RGB_R、P_GAnd P_BControl the intensity of three kinds of colors of display respectively, with And be 2R in the length of side₀Foursquare maximum inscribed circle in display luminescent spectrum virtual LED effect luminescent image.