WO2018157913A1

WO2018157913A1 - Method for classifying radiation-emitting components

Info

Publication number: WO2018157913A1
Application number: PCT/EP2017/054619
Authority: WO
Inventors: Alexander Wilm
Original assignee: Osram Opto Semiconductors Gmbh
Priority date: 2017-02-28
Filing date: 2017-02-28
Publication date: 2018-09-07

Abstract

According to at least one embodiment of the method for classifying a radiation-emitting component (10), the method comprises a method step in which a radiation-emitting component (10) is provided. The method further comprises a method step, in which a colour locus (11) of the light emitted by the radiation-emitting component (10) during operation is determined in a colour space (12). The radiation-emitting component (10) is then divided into a colour locus area (13) which contains the colour focus (11). The colour space (12) here comprises a plurality of colour locus areas which can be perceived by the human eye as different colours and the colour space (12) is determined by a field of vision (16) that is greater than 2°.

Description

description

Method for classifying radiation-emitting components

There will be a method of classifying

radiation-emitting components indicated. The radiation-emitting component is

in particular, a light source that emits visible light during operation. For example, the component may be a discharge lamp, a light-emitting diode, that is to say a laser diode or a light-emitting diode, an organic light-emitting diode or a light-emitting diode module.

In particular, the component may be a radiation-emitting, optoelectronic semiconductor component.

In many applications of radiation-emitting

Components are specified by standards precisely defined colors of emitted light. Due to the

Manufacturing process or different excitation energies can be observed in radiation-emitting components of a type and manufacturer color differences in a direct comparison. It is therefore often necessary that

to divide radiation-emitting components into graded classes (English: bins), ie one

Classification (English: binning) to make.

However, it has been shown that the light of

radiation-emitting components, which are classified in the same class, for a viewer anyway

can cause different color perceptions.

Especially with a class division, which of the

is based on widespread CIE 1931 XYZ color space, it is it is possible for a viewer to perceive differences between the colors of emitted radiation from devices of a class.

An object to be solved is to specify a method for classifying radiation-emitting components, in which the colors of the emitted light of components of a class look particularly similar or the same to a viewer.

In accordance with at least one embodiment of the classifying method, a radiation-emitting component is first provided.

In a subsequent method step, a color locus of the light emitted by the radiation-emitting component during operation is determined in a color space. In this case, the color locus represents the color of the emitted light of the component perceived by a viewer. The determination of a color locus is thus based on the physiology of the human eye. The color location can be given for example by two color space coordinates in the color space. The color space can be any one

Be color space in which colors are shown.

Advantageously, the color space is a color space defined by a norm.

In a further process step, the

Radiation-emitting device is divided into a color locus, which includes the color location. The color locus may, for example, be chosen such that all color loci of the

Color locale for a viewer the same color. It is also possible that the color locus range is selected such that all color loci of the color locus range for a viewer have a very similar color. That is, the division into individual Farbortbereiche is made such that color locations that cause the same or a similar color perception in the viewer in the same Farbortbereich lie.

The color loci are thus, for example, the classes into which the radiation-emitting component can be classified or the part of such a class. So it's also possible for a class to have several

Color locales includes.

In accordance with at least one embodiment of the method, the color space comprises a multiplicity of color location areas, which are perceived by the human eye as different colors, and the color space is determined by a field of view that is greater than 2 °. Thus, color locations can be

different color loci are perceived by a human observer as different colors. Different colors are preferably different white tones or gradations. But it is also possible that they are different shades of a different color or different colors.

The entire color space is preferably in color loci

assigned. In this way it is possible, different components - for example, white LEDs with

different white tones, but also colored light emitting diodes such as red, green, blue or yellow light emitting diodes - consistent in classes.

The color space is determined by the color perception of the human eye. For this purpose, for example, to determine the Standard CIE 170-2: 2015 adopted a so-called standard observer. Based on the color perception of the

Standard observers will light, whose colors the

Standard observer perceives as equal, assigning a color location with the same color space coordinates. To determine the color perception of the standard observer, a field of view of the standard observer is defined with an opening angle. The size of the field of view for determining a color space thus corresponds to the size of, for example, a luminous or an illuminated area, with which the

Color perception of the standard observer is determined, in the field of view of the standard observer. The luminous area can be a light source and in the

illuminated area may be one of a

Act light source illuminated area. It gives the

Aperture angle at which proportion of the total field of view of the standard observer occupies the luminous or illuminated area. The opening angle also indicates which

Angle range the image of the area on the retina of the

Standard observer occupies. In a field of view of

for example, 10 °, the image of the area on the retina of the standard observer occupies an angle range of 10 °.

The color space is determined by a field of view that is greater than 2 °. Preferably, the field of view is greater than 7 ° and more preferably the field of view is 10 °. This is based on the consideration that the cones in the human eye are not distributed uniformly over the retina for the perception of different colors. If the field of view for the determination of a color space is only about 2 °, then the perception of a color in this field of vision can be determined by the

Differentiate perception with another field of vision. This is due to the inhomogeneous distribution of the pins. Advantageously, therefore, the color space by a

Field of view determines which is greater than 2 ° and thus extends over a larger area of the retina. It has been shown that the color perception of the size of the

Field of view depends. This means that differences in color perception can occur for different sized objects or light sources in the field of view of the observer. However, from a size of about 7 ° of the field of view there are no discernible differences in color perception for different sized objects. That is, if the color space is determined by a field of view which is greater than 7 °, a viewer does not perceive differences in the color of light having the same color location. If a color space is determined by a field of view which is approximately 2 °, it is possible for a viewer to perceive differences in the color of light with the same color location, for example if the light source extends over an area in the field of view of the viewer that is greater than 2 ° is.

It is also possible that the size of the color loci is selected so that color loci of a color locus area look the same to a viewer. Thus it is possible

Radiation-emitting components, which either

Have differences in the production, different

Have excitation energies or otherwise differentiate into color loci so that the radiation of components of a color locus looks the same to a viewer.

The color space can be defined, for example, by the CIE 170-2: 2015 standard. In accordance with at least one embodiment of the method for classifying a radiation-emitting component, a radiation-emitting component is provided. A color locus of the light emitted by the radiation-emitting component during operation is determined in a color space. Subsequently, the radiation-emitting component is divided into a color locus which comprises the color locus. The color space includes a variety of

Color loci which are seen by the human eye as

Different colors can be perceived, and the color space is determined by a field of view that is greater than 2 °.

In accordance with at least one embodiment of the method, another color locus of the light emitted by the radiation-emitting component during operation is determined in a further color space. The further color space may be a different color space than the color space. In this case, the further color location in the further color space is likewise determined by the color perception of a viewer. Like in

Related to the color space described become

Determination of a color location in a color space two

Color space coordinates determined. The color space coordinates of the further color location may differ from those of the color locus.

Preferably, the further color location of the

radiation-emitting device during operation of emitted light determined before the color location of the emitted light is determined.

The additional color space can be based on a different standard than the color space. Thus, advantageously by the Determination of the color location and the further color location two different standards are met.

In accordance with at least one embodiment of the method, the radiation-emitting component is converted into another

Color locus, which includes the other color location, divided. As described in connection with the color locus range, the further color locus range can also include multiple color loci. It is possible for a viewer to have light with different color locations within another color locus in the

another color space perceives different colors. But it is also possible for a viewer to be with light

different color locations within one another

Color locus in the wider color space perceives the same color.

In accordance with at least one embodiment of the method, the further color space is determined by a field of view which is smaller than the field of view of the color space and which, for example, is 2 °. For example, the wider color space of the CIE 1931 XYZ color space may be. This standard is very common in the field of light-emitting diodes, which is why it is advantageous if radiation-emitting components according to this standard in

Classes are divided. Since, in the method described here, the radiation-emitting components are first divided into a further color locus in the further color space and then subdivided into a color locus in the color space, it is advantageously possible to meet two different standards for classifying components. Thus, the advantages of both color spaces can be used. For example, the division within the color space may allow a viewer to equate the color of light from components from a color locus area perceives. In addition, the division within the

Another color space allows a widespread standard for light-emitting diodes or semiconductor devices to be fulfilled.

According to at least one embodiment of the method, the color locus and the further color locus with a

Radiospektrometer determined. In this case, for example, the spectrum of the light emitted by the component during operation is detected. From this, the color location and the further color location of the light can be determined. A radio spectrometer offers the advantage that only one measurement has to be carried out, from which both the color locus and the further color locus can be calculated. In comparison, the size of the field of view would have to be adjusted for a photodiode with three color filters.

In accordance with at least one embodiment of the method, only the color locus of the light emitted by the radiation-emitting component during operation is in the color space

determined. This means that only the color locus of the

radiation-emitting component operation of emitted light in the color space is determined and that no further color location is determined in a further color space. Furthermore, the radiation-emitting component is only divided into the color locus area that includes the color locus, and no further color locus area in a further color space. This also means that no further color locus of the light emitted by the radiation-emitting component during operation is determined in the further color space. Furthermore, the radiation-emitting component is not divided into a further color location area in the further color space. Advantageously, the radiation-emitting component can thus be divided into a class more efficiently, since the division into the further color locus range is omitted.

In addition, the color space can be chosen so that the color of a light source is perceived regardless of the size of the light source. With that it is possible that

Radiation-emitting devices are classified into classes, the light emitted by radiation-emitting

Components of a class is perceived as equal, regardless of the size of the luminous or illuminated surface.

In accordance with at least one embodiment of the method, the color space is determined by a field of view which is greater than 9 °. Advantageously, the determination of a

Color space through a field of view, which is greater than 9 °, for a viewer no differences in color perception for different sized objects in the field of view of the

Beholder. Besides, light looks the same

Color space coordinates are the same for a viewer. It is thus possible to classify radiation-emitting components into classes, the colors of the emitted light of components of a class appearing the same to a viewer.

In accordance with at least one embodiment of the method, the size of each color locus region in the underlying color space is selected in such a way that it is assumed that an observer for colors from the respective color space

Color locale perceives no difference. For this purpose, for example, the size of each color location area is selected such that each color location area comprises a limited range of color space coordinates. The size of a each color locus chosen so that a viewer with a given field of view for colors from a

Color locale perceives no difference. It is also assumed that a viewer with a

others, ie a larger or a smaller field of view than the given one, perceives no difference for colors from a color location area. Since the color space and the further color space can be determined by fields of view of different sizes, it is possible that the color of light

is perceived as being equal within one color space area in one color space and different in another color space.

In accordance with at least one embodiment of the method

The size of each color locus corresponds to a maximum of three units in the CIE 2015 u'v 'color space, which is formed by a coordinate transformation from the CIE 2015 XYZ color space. This coordinate transformation is

for example, given by the standard ISO 11664-5: 2009 (E). This means that the extent of each color locus is at most 0.003 in the CIE 2015 u'v 'color space. These details may be in different color spaces

be transformed. For example, the size of each color locus is at most a 3-step MacAdam ellipse in the CIE 1931 XYZ color space.

In accordance with at least one embodiment of the method

The size of each color locus is approximately equal to or equal to a unit in the CIE 2015 u'v 'color space formed by a coordinate transformation from the CIE 2015 XYZ color space. This means that the extent of each color locus is at most 0.001 in the CIE 2015 u'v 'color space. Thus, color locations call in the same Color locus range, the same color perception in the viewer. It is also possible to specify the size of each color locus in a different color space. For example, the size of each

Color locus at most a 1-step MacAdam ellipse in the CIE 1931 XYZ color space.

The size of the color loci can be specified

Specifications are customized and a given

Fulfill tolerance. For low cost production, for example, it may be desirable to make the size of the color spaces larger, allowing a viewer to color locations one color space

Farbortbereich as very similar, but as

perceives different colors. Therefore, it is also possible that the size of each color locus corresponds to a maximum of five units in the CIE 2015 u'v 'color space. The size of each color location area preferably corresponds to at most three units in the CIE 2015 u'v 'color space. More preferably, the size of each color locus is approximately equal to or equal to one unit in the CIE 2015 u'v 'color space.

In accordance with at least one embodiment of the method, each color location in a color space is replaced by at least two

Assigned color space coordinates, wherein the assignment of the at least two color space coordinates based on how at least one viewer perceives the respective color location. Thus, color locations within a color space can be compared. In the CIE 2015 u'v 'color space, the Mac Adam Ellipse points

advantageously the shape of a circle, so that the color locations are evenly distributed in the color space. Furthermore, the color space coordinates can be better compared with each other since these are the same in both spatial directions

away from each other.

The following describes the method described here

Classification of radiation-emitting components based on embodiments and the associated

Figures explained in more detail.

The method described here is explained in more detail with reference to FIG.

Figures 2A and 2B show spectra of light emitting diodes with the same color temperature and the same

Color space coordinates.

In FIGS. 3A and 3B, the color space coordinates are

various light-emitting diodes in two different color spaces shown. With reference to FIG 4 is schematically the field of view of a

Viewers shown.

In FIGS. 5A, 5B, 6A, 6B, 7A and 7B, FIGS

Color space coordinates of different LEDs in different color spaces shown.

The same, similar or equivalent elements are provided in the figures with the same reference numerals. The figures and the proportions of the elements shown in the figures with each other are not to scale

consider. Rather, individual elements may be exaggerated in size for better representability and / or better understanding. FIG. 1 shows schematically steps of the method described here. In a first step Sl, a radiation-emitting component 10 is provided. The component 10 may be, for example, a light emitting diode.

In a second step S2, a color location 11 of the

Radiation-emitting component 10 in operation emitted light detected in a color space 12. The color location 11 may be given, for example, by color space coordinates in the color space 12. Subsequently, in a third step S3 the

Radiation-emitting device 10 is divided into a color locus region 13, which includes the color locus 11. The color location area 13 can be selected, for example, such that all color locations of the color location area 13 have the same color for a viewer.

It is also possible for the color locus region 13 to be selected such that all color loci of the color locus region 13 have a very similar color for a viewer. In this embodiment, the color location area 13 is selected to be circular. But it is also possible that the color location area 13 has a different shape.

FIG. 2A shows spectra of three different light-emitting diodes L2, L3, L4 with the same color temperature of 3000 K and the same color space coordinates. The wavelength is plotted in nm on the x-axis and the intensity is plotted on the y-axis. The line LI shows the spectrum of a Planck's radiator. The remaining lines show spectra of three light-emitting diodes L2, L3, L4, which have a different color rendering index. The light of the three

different light-emitting diodes L2, L3, L4, however, the same color space coordinates are assigned in a further color space 17, which is determined by a field of view 16 of 2 °. It is thus possible that the spectra of light-emitting diodes are different, but the light-emitting diodes have the same color space coordinates.

FIG. 2B shows spectra of five different light-emitting diodes L5, L6, L7, L8, L9 with the same color temperature of 3000 K and the same color space coordinates. The wavelength is plotted on the x-axis in nm and the intensity is plotted on the y-axis. The LI line continues to show the spectrum of a Planckian radiator. The remaining lines show spectra of five LEDs L5, L6, L7, L8, L9, in which the blue chip is excited with different excitation energies. These five light-emitting diodes L5, L6, L7, L8, L9 also have the same color space coordinates in the further color space 17. It is thus possible that

Light emitting diodes with different excitation energies have the same color space coordinates. In FIG. 3A, the color space coordinates of the eight

Light-emitting diodes L2, L3, L4, L5, L6, L7, L8, L9 from Figures 2A and 2B in the other color space 17 applied. The x-coordinate is plotted on the x-axis and the y-coordinate is plotted on the y-axis. The further color space 17 is here the CIE 1931 XYZ color space, which is determined by a field of view 16 of 2 °. In the further

Color space 17, all eight LEDs L2, L3, L4, L5, L6, L7, L8, L9 have the same color space coordinates. Furthermore the 3-step MacAdam ellipse is drawn with the solid line and the 1-step MacAdam ellipse with the dotted line. Within the further color space 17

So are all the LEDs L2, L3, L4, L5, L6, L7, L8, L9 in the same Farbortbereich.

In FIG. 3B, the color space coordinates of the eight are

Light-emitting diodes L2, L3, L4, L5, L6, L7, L8, L9 from FIGS. 2A and 2B are applied in the color space 12. The u ^λ coordinate is plotted on the x axis and the ν ^λ on the y axis

Coordinate applied. The color space 12 is a color space defined by the CIE 170-2: 2015 standard. The color space 12 is determined by a field of view 16 of 10 °. The u ^x and v ^λ coordinates can be determined by a coordinate transformation given, for example, by the standard ISO 11664-5: 2009 (E). In the color space 12, the MacAdam ellipse has the shape of a circle. The size of a 1-step Mac Adam ellipse

corresponds to one unit here. Therefore, the radius of the dotted circle is one unit, that is, 0.001, and the radius of the solid circle is three units, that is, 0.003. The eight different light-emitting diodes L2, L3, L4, L5, L6, L7, L8, L9 do not have the same color space 12

Color space coordinates on. Only one light-emitting diode L5 is in the range of one unit and two light-emitting diodes L8, L9 are outside the range of three units. One

Observer with a field of view 16 of at most 10 ° thus takes different colors for the light emitted by the light emitting diodes L2, L3, L4, L5, L6, L7, L8, L9.

In Figure 4, the field of view 16 of a viewer is shown schematically. A luminous surface or light source in the field of view 16 of the observer occupies a certain Angle range in the field of view 16 of the viewer. The larger the illuminated or illuminated area, the larger the angular range. Similarly, the image of the area on the retina 15 in the eye 14 of the viewer takes a particular

Angle range. If the field of view 16 of the observer is 2 °, a surface occupies an angular range of 2 ° in

Field of view 16 of the viewer. If the field of view 16 of the observer is 10 °, the image of a luminous or illuminated surface in the field of view 16 of the observer also extends over a range of 10 ° on the retina 15 of the observer.

It has been shown that the color perception depends on the size of the field of view 16. This means that differences in color perception for different sized objects or light sources can occur in the field of view 16 of the viewer. From a size of about 7 ° of the field of view 16, however, there are no discernible differences in the

Color perception for objects of different sizes. This means when the color space 12 through a field of view 16

is determined which is greater than 7 °, a viewer does not take differences in the color of light with the same

Color place true. Is a color space through a field of view 16

determined, which is about 2 °, it is possible for a viewer to perceive differences in the color of light with the same color location, for example, when the light source extends over an area in the field of view 16 of the observer, which is greater than 2 °. In FIG. 5A, the color space coordinates of the eight

Light-emitting diodes L2, L3, L4, L5, L6, L7, L8, L9 applied in the color space 12. The x-coordinate is plotted on the x-axis and the y-coordinate is plotted on the y-axis. In In this representation, the MacAdam ellipse has the shape of an ellipse. As in Figure 3B, two light emitting diodes L8, L9 are outside the 3-step MacAdam ellipse. FIG. 5B likewise plots the color space coordinates of the eight light-emitting diodes L2, L3, L4, L5, L6, L7, L8, L9 in the color space 12. On the x-axis is the coordinate u ^λ

plotted and on the y-axis, the v ^λ coordinate is plotted. The x and y coordinates of the light-emitting diodes L2, L3, L4, L5, L6, L7, L8, L9 from FIG. 5A were therefore connected to the light-emitting diode as described in connection with FIG

Coordinate transformation converted to u ^x and v ^λ coordinates according to standard ISO 11664- 5: 2009 (E). In this case, the color space 12 of the CIE 2015 is u'v 'color space, which is formed by a coordinate transformation from the CIE 2015 XYZ color space.

FIG. 6A shows simulated color space coordinates for a plurality of light emitting diodes in the further color space 17

applied. The simulated data is based on a virtual production of a plurality of light-emitting diodes. The x-coordinate is plotted on the x-axis and the y-coordinate is plotted on the y-axis. The solid line represents the 3-step MacAdam ellipse and the

Dashed line represents the 1-step MacAdam ellipse. As an example, the color space coordinates of three

LEDs L3, L6, L8 highlighted. The

Color space coordinates of the plurality of light emitting diodes are distributed evenly over the area of the two MacAdam ellipses. For example, the 3-step MacAdam ellipse may be the wider color locus. In FIG. 6B, the simulated color space coordinates for the plurality of light-emitting diodes from FIG. 6A are in the color space 12

applied. On the x-axis is the u ^λ coordinate

plotted and on the y-axis is the v ^λ coordinate

applied. The radius of the dashed circle is one unit, that is, 0.001, and the radius of the solid circle is three units, that is, 0.003. The simulated color space coordinates for the plurality of light-emitting diodes

extend in the color space 12 over a larger area than three units. In a class division in the color space 12 into a color space region 13 with a radius of three units, therefore, not all the light-emitting diodes from FIG. 6A are divided into this color space region 13. By way of example, the color space coordinates of the three light-emitting diodes L3, L6, L8 from FIG. 6A are also highlighted. The color space coordinates of a light emitting diode L3 are outside of the circle with the radius of three units. With these simulated

Color space coordinates are shown that the determined color locations can differ in different color spaces.

FIG. 7A shows simulated color space coordinates for a plurality of light-emitting diodes in the further color space 17

applied. The simulated data is based on a

virtual production of a variety of light emitting diodes. The x-coordinate is plotted on the x-axis and the y-coordinate is plotted on the y-axis. The solid line represents the 3-step MacAdam ellipse and the

LEDs L3, L6, L8 highlighted. The

Color space coordinates of the plurality of LEDs are even across the range of the 1-step MacAdam ellipse distributed. The 1-step MacAdam Ellipse may be

for example, to act on the other Farbortbereich.

In FIG. 7B, the simulated color space coordinates for the plurality of light-emitting diodes from FIG. 7A are in the color space 12

applied. On the x-axis is the u ^λ coordinate

plotted and on the y-axis is the v ^λ coordinate

applied. The radius of the dashed circle is one unit, that is, 0.001, and the radius of the solid circle is three units, that is, 0.003. Although the color space coordinates in the wider color space 17 are distributed only over the area of the 1-step MacAdam ellipse, the simulated color space coordinates in the color space 12 extend over a larger area than three units. At a

Classification in the color space 12 in a color space region 13 with a radius of one unit, therefore, not all light-emitting diodes from Figure 7A are divided into this color space area 13. The color space coordinates of the three light-emitting diodes L3, L6, L8 from FIG. 7A are also highlighted by way of example. The color space coordinates of a light emitting diode L3 are outside of the circle with the radius of three units.

If the color location area 13 is now selected so that it is in

Color space 12 has a radius of one unit, a viewer takes the colors of the emitted light from the radiation-emitting devices 10 as equal, regardless of the size of the light source. It is thus possible

Classify radiation emitting devices 10 into classes, where for a viewer the colors of the emitted light of devices 10 of a class look the same. If the radiation-emitting components 10 only in the

Color locus 13 in the color space 12 and not divided into the other color locus in the other color space 17, so can the radiation-emitting component 10 can be divided into a class more efficiently, since the division into the additional color locus range is eliminated. The invention is not limited by the description based on the embodiments of these. Rather, the invention encompasses every new feature as well as every combination of features, which in particular includes any combination of features in the patent claims, even if this feature or combination itself is not explicitly described in the claims

Claims or embodiments is given.

Reference sign list

10: component

11: Color location

12: color space

13: color locale

14: eye

15: Retina

16: field of view

17: another color space

LI: line

L2: LED

L3: LED

L4: LED

L5: LED

L6: LED

L7: LED

L8: LED

L9: LED

Sl: first step

S2: second step

S3: third step

Claims

claims

1. Classification of a

radiation-emitting component (10) with the steps: - providing a radiation-emitting component (10),

- Determining a color location (11) of the

radiation-emitting component (10) during operation

emitted light in a color space (12),

- dividing the radiation-emitting component (10) into a color location area (13) which includes the color location (11), wherein the color space (12)

a plurality of color loci which can be perceived by the human eye as different colors, and

- Is determined by a field of view (16), which is greater than 2 °.

2. The method of claim 1, wherein a further color locus of the light emitted by the radiation-emitting component (10) during operation in a further color space (17) is determined.

3. The method according to the preceding claim, wherein the radiation-emitting device (10) in a further

Color locus, which includes the other color locus is divided.

4. The method according to any one of claims 2 or 3, wherein the further color space (17) by a field of view (16) is determined, which is 2 °.

5. The method according to any one of claims 2 to 4, wherein the color locus (11) and the further color locus with a

Radiospektrometer be determined.

6. The method according to claim 1, wherein exclusively the

Color location (11) of the radiation-emitting component (10) emitted during operation light in the color space (12) is determined.

7. The method according to any one of the preceding claims, wherein the color space (12) by a field of view (16) is determined, which is greater than 9 °.

8. The method according to any one of the preceding claims, wherein the size of each color locus in the underlying color space is chosen such that it is assumed that a viewer for colors from the respective

Color locale perceives no difference.

9. The method according to any one of the preceding claims, wherein the size of each Farbortbereiches at most three

Units in the CIE 2015 u'v 'color space, which is formed by a coordinate transformation from the CIE 2015 XYZ color space.

10. The method of claim 1, wherein the size of each color locus is approximately equal to or equal to a unit in the CIE 2015 u'v 'color space formed by a coordinate transformation from the CIE 2015 XYZ color space.

11. The method according to any one of the preceding claims, wherein each color locus in a color space at least two Color space coordinates are assigned, wherein the assignment of the at least two color space coordinates based on how at least one viewer perceives the j eweiligen color location