WO2020089146A1

WO2020089146A1 - Light-emitting device with solid-state light sources

Info

Publication number: WO2020089146A1
Application number: PCT/EP2019/079349
Authority: WO
Inventors: Ties Van Bommel; Rifat Ata Mustafa Hikmet
Original assignee: Signify Holding B.V.
Priority date: 2018-10-29
Filing date: 2019-10-28
Publication date: 2020-05-07

Abstract

A light-emitting device (2) and a method for producing a light-emitting device (2) are disclosed. The light-emitting device (2) comprises: an elongated, flexible carrier (4); and a plurality of solid-state light sources (6) mounted on the carrier (4). The carrier (4) has a plurality of longitudinal, emitting sections (4a) separated by longitudinal, non-emitting sections (4b), each emitting section (4a) having at least one of the solid-state light sources (6) mounted thereon, and each non-emitting section (4b) having no solid-state light sources mounted thereon. The carrier (4) has been folded or bent in a predetermined manner at the non-emitting sections (4b) so that the solid-state light sources (6) form a two-dimensional pattern having an outer contour (7) which is approximately circular. The light-emitting device (2) can be produced in a simple and cost-effective manner.

Description

LIGHT-EMITTING DEVICE WITH SOLID-STATE LIGHT SOURCES

FIELD OF THE INVENTION

The present invention relates to a light-emitting device with solid-state light sources arranged in a two-dimensional pattern and to a method for producing such a light- emitting device.

BACKGROUND OF THE INVENTION

There exists a type of light-emitting devices which have light-emitting diodes (LEDs) mounted on a flat platform, typically a metal-core printed circuit board. These existing platforms are suitable for applications where the LEDs should be mounted in a straight row or so as to form a rectangle, such as a square. However, in some applications, it is desirable to have the LEDs arranged in a circular pattern, and, from a manufacturing standpoint, it is difficult and expensive to arrange the LEDs in such a pattern using existing platforms. SUMMARY OF THE INVENTION

It is an object of the present invention to provide an improved or alternative light-emitting device with solid-state light sources.

According to a first aspect of the present invention, there is presented a light- emitting device comprising: an elongated, flexible carrier; and a plurality of solid-state light sources mounted on the carrier, wherein the carrier has a plurality of longitudinal, emitting sections separated by longitudinal, non-emitting sections, each emitting section having at least one of the solid-state light sources mounted thereon, and each non-emitting section having no solid-state light sources mounted thereon, wherein the carrier has been folded or bent in a predetermined manner at the non-emitting sections so that the solid-state light sources form a two-dimensional pattern having a predefined outer contour. Preferably, the two-dimensional pattern is having an outer contour, which is approximately circular.

According to a second aspect of the present invention, there is presented a method for producing a light-emitting device. The method comprises: mounting a plurality of solid-state light sources on an elongated, flexible carrier such that the carrier has a plurality of longitudinal, emitting sections separated by longitudinal, non-emitting sections, each emitting section having at least one of the solid-state light sources mounted thereon, and each non-emitting section having no solid-state light sources mounted thereon; and folding or bending the carrier in a predetermined manner at the non-emitting sections so that the solid- state light sources form a two-dimensional pattern having a predefined outer contour Preferably, the two-dimensional pattern is having and outer contour, which is approximately circular.

Folding here means to fold the carrier out of a plane defined by the carrier. Bending here means to bend the carrier in a plane defined by the carrier. The carrier may for example have been folded or bent at more than five non-emitting sections, alternatively at more than ten non-emitting sections or at more than fifteen non-emitting sections.

By“approximately circular” is here meant that, for the purposes of the application at hand, the light emitted from the light-emitting device has a shape which is sufficiently similar, according to an observer, to that which would have been emitted had the outer contour been perfectly circular. As an example, a polygonal contour may be considered approximately circular in the sense used herein provided that it has a sufficient number of sides, typically six or more.

The outer contour is defined by the positions of the two-dimensional pattern’s outermost solid-state light sources. The outer contour may for example run between the centers, the corners and/or or the sides of the solid-state light sources. The small size of solid- state light sources means that in practice there is some freedom as to how the outer contour is “drawn”.

The present invention is based on the realization that a light-emitting device with solid-state light sources arranged in a two-dimensional pattern having an outer contour which is approximately circular can be produced in a simple, fast and cost-effective manner by, first, mounting the solid-state light sources on a flexible carrier at suitable positions and, then, folding or bending the carrier in a suitable manner so as to obtain a desired, approximately circular outer contour.

The light-emitting device is suitable for many lighting applications. For example, the light-emitting device may be included in a luminaire. The luminaire may comprise a housing having a bottom surface and one or more sides walls. The luminaire may further comprise an exit window for releasing light emitted by the solid-state light sources to the surroundings of the luminaire. The exit window may be a diffuser or a diffractive component, such as an array of lenses or an array of pyramids. The two-dimensional pattern may be a polygon having at least six sides, alternatively at least seven sides or at least eight sides. The greater the number of sides of the polygon, the better the outer contour may approximate a circle. The polygon may be a regular polygon, but this is not necessary. Each side of the polygon may be defined by at least two solid-state light sources or at least three solid-state light sources.

The two-dimensional pattern may comprise rows and columns. For example, there may be at least two rows with three solid-state light sources, and two columns with at least three solid-state light sources. As another example, there may be at least two rows with four solid-state light sources, and two columns with at least four solid-state light sources. As yet another example, there may be at least four rows with three solid-state light sources, and four columns with at least three solid-state light sources.

The two-dimensional pattern may be a ring. The ring defines an interior region where there are no solid-state light sources.

There may be at least two light sources mounted on each emitting section, for example at least three light sources or at least four light sources. Each emitting section may have at least two solid-state light sources which are displaced relative to each other with respect to a longitudinal axis of the carrier. The solid-state light sources on each emitting section may be arranged on a circle. At least two of the emitting sections may have different numbers of solid-state light sources mounted thereon. A distance between solid-state light sources on one of the emitting sections may be different from a distance between solid-state light sources on at least one other emitting section. At least one of the solid-state light sources may be elongated and arranged such that a major axis or minor axis is pointing towards a center of the two-dimensional pattern.

The carrier may have been folded or bent into one of: a polygonal shape; a spiral shape; and a meander shape. The spiral shape typically has at least three loops. The meander shape typically has at least three turns.

At least one of the non-emitting sections may have been provided with a notch, and the carrier may have been bent at the notch in a plane of the carrier. The notch is typically formed a late stage in the production process because the notch might make the carrier difficult to handle as a result of the carrier becoming very flexible at the area around the notch. The notch may for example be formed by tearing along a perforation line on the carrier, or by cutting the carrier. A non-emitting section, which is provided with a notch, may have a connection portion which connects portions of the non-emitting section on different sides of the notch and which serves as a hinge. Such a hinge may be referred to as a“living hinge”, i.e. a thin, flexible hinge made from the same material as the two pieces that are connected by the hinge.

The carrier may comprise electrical circuitry with mounting sites for solid- state light sources, and at least one of the mounting sites may be short circuited by a jumper. Thus, the jumper ensures, instead of a solid-state light source, that electricity can run through the mounting site. The use of jumpers may allow for the carrier to be based on a standard type of flexible printed circuit board for solid-state light source.

All of the solid-state light sources are typically mounted on the same side of the carrier. Carriers with all of the solid-state light sources on the same side are typically relatively simple to produce at a low cost. If the solid-state light sources are mounted on the same side of the carrier and the carrier is folded, then folding each emitting section twice, or an even number of times, is a way of making the solid-state light sources end up facing the same direction.

It is noted that the invention relates to all possible combinations of features recited in the claims.

BRIEF DESCRIPTION OF THE DRAWINGS

This and other aspects of the present invention will now be described in more detail, with reference to the appended drawings showing embodiment(s) of the invention.

Figure 1 shows a schematic perspective view of a luminaire according to an embodiment of the present invention.

Figure 2a and 2b show schematic top plan views of the light-emitting device of the luminaire in Figure 1.

Figures 3 a, 3b and 3 c schematically show an example of a fold combination.

Figures 4a, 4b and 4c schematically show another example of a fold combination.

Figures 5a, 5b and 5c schematically show yet another example of a fold combination.

Figures 6 to 1 lb show schematic top plan views of light-emitting devices according to different embodiments of the present invention.

As illustrated in the figures, the sizes of layers and regions are exaggerated for illustrative purposes and, thus, are provided to illustrate the general structures of

embodiments of the present invention. Tike reference numerals refer to like elements throughout. DETAILED DESCRIPTION

The present invention will now be described more fully hereinafter with reference to the accompanying drawings, in which currently preferred embodiments of the invention are shown. This invention may, however, be embodied in many different forms and should not be construed as limited to the embodiments set forth herein; rather, these embodiments are provided for thoroughness and completeness, and fully convey the scope of the invention to the skilled person.

Figure 1 shows a luminaire 1 mounted to a ceiling for illuminating a room.

The luminaire 1 here comprises an exit window 8 and a light-emitting device 2. The exit window 8 is arranged so that light emitted by the light-emitting device 2 is released to the room. The light-emitting device will be described in more detail with reference to Figures 2a and 2b. Figure 2a shows the light-emitting device 2, and Figure 2b shows the flexible circuit carrier 4 (further discussed below) of the light-emitting device 2 in a straight, pre-folded state.

The light-emitting device 2 comprises in this case a support member 3. The support member 3 is in this case planar and rigid. The support member 3 is here made of a plastic material, although the support member 3 can of course be made of some other type of material in another example. The support member 3 comprises in this case connections (not shown) for connecting the light-emitting device 2 to receive electrical power, here electricity from the mains.

The light-emitting device 2 further comprises a flexible, elongated carrier 4, which will henceforth be referred to as the“carrier” for brevity. The carrier 4 is in this case a flexible strip on which conductive tracks (not shown) have been printed. The carrier 4 may have a length L_c and a width W_c. The length L_c may be at least 50 cm, alternatively at least 80 cm or at least 100 cm. The width W_c may be in the range from 0.4 cm to 4 cm, alternatively in the range from 0.6 cm to 3 cm or in the range from 0.8 cm to 2 cm, such as 1 cm. The ratio L_c/W_c may be at least 10, alternatively at least 20 or at least 30, such as 50 or 100.

A layer 5 of an electrically isolating material is arranged on the conductive tracks. A purpose of the layer 5 is to ensure that those parts of the conductive tracks that end up on top of each other when the carrier 4 is folded do not come into electrical contact with each other. The carrier 4 is attached to the support member 3. In general, it is possible to attach the carrier 4 to the support member 3 using mechanical means, such as nails, or chemical means, such as an adhesive. In this case, one side of the carrier 4 is provided with glue that fixes the carrier 4 to the support member 3. The side provided with glue is the side where there are no solid-state light sources 6, which will be discussed next.

Several solid-state light sources 6, henceforth referred to as the“light sources” for brevity, are mounted on the carrier 4 and electrically connected to the electrical circuitry of the carrier 4. The carrier 4 is configured to provide electrical power to the light sources 6. The light sources 6 may for example be semiconductor light-emitting diodes (LEDs), organic LEDs, polymer LEDs, or laser diodes. All of the light sources 6 may be configured to emit light of the same color, for example white light, or different light sources 6 may be configured to emit light of different colors. The white light may be light which is within 15 SDCM from the black body locus. The color temperature may for example be in the range from 2000 K to 6000 K, alternatively in the range from 2300 K to 5000 K or in the range from 2500 K to 4000 K. The color rendering index CRI may for example be at least 70, alternatively at least 80 or at least 85, such as 90 or 92.

All of the light sources 6 are here mounted on the same side of the carrier 4. Also, all of the light sources 6 have in this case the same general direction of illumination. The general direction of illumination of the light sources 6 is here perpendicularly away from the carrier 4. The light sources 6 are substantially square. The light sources 6 may, however, have some other shape in a different example.

The light sources 6 are mounted on the carrier 4 at emitting sections 4a thereof. The carrier 4 also has non-emitting sections 4b. No light sources 6 are mounted on the non-emitting sections 4b. The carrier 4 illustrated in Figures 2a and 2b has six emitting sections 4a and five non-emitting sections 4b, but these numbers may of course be different in another example. The emitting and non-emitting sections 4a, 4b extend along a longitudinal direction of the carrier 4. The emitting sections 4a are separated by the non emitting sections 4b. Stated differently, each non-emitting section 4b is located between two emitting sections 4a.

Each emitting section 4a has at least one light source 6 mounted thereon. Specifically, in this case, two of the emitting sections 4a are provided with two light sources 6, two of the emitting sections 4a are provided with four light sources 6, and two of the emitting sections 4a are provided with six light sources 6. The numbers of light sources 6 mounted on the emitting sections 4a may of course be different in another example. The total number of light sources 6 on the carrier 4 may be significantly higher than in Figure 2a, such as in the hundreds or thousands, something which may facilitate providing an outer contour 7 that closely approximates a circle. Further, it is also possible that all of the emitting sections 4a are provided with the same number of light sources 6 or that all of the emitting sections 4a are provided with different numbers of light sources 6. In this case, the distance d between the light sources 6 is the same on every emitting section 4a, although this may or may not be the case in a different example. The distance d may be referred to as the“pitch”.

As is clear from Figure 2a, the light sources 6 form a two-dimensional pattern which has an outer contour 7 that is approximately circular. By the pattern being“two- dimensional” here means that the pattern is planar, something which in this case results from the carrier 4 being arranged on the planar support member 3. In this case, the two- dimensional pattern consists of straight rows and straight columns. The rows and columns here form a polygonal shape, more precisely an octagonal shape. The two-dimensional pattern here has a substantially uniform density of light sources 6. The carrier 4 has been folded at the non-emitting sections 4b so as to form the two-dimensional pattern in Figure 2a. Specifically, each non-emitting section 4b has in this case been folded such that its adjacent emitting sections 4a are substantially parallel. Each non-emitting section 4b forms two angles qi, 0₂ of approximately 90°. Thereby, each non-emitting section 4b here forms a U-like shape. As is clear from Figure 2a, the carrier 4 in this case forms a meander shape. The meander shape here has five 180° turns.

There are several ways to fold the carrier 4 at the non-emitting sections 4b so as to obtain the shape illustrated in Figure 2a. Some examples of ways of folding the carrier 4 will be discussed in more detail below with reference to Figures 3a to 5c. In order to make a non-emitting section 4b have a U-like shape, one may for example repeat the fold combination in Figures 3a, 3b, 3c or in Figures 4a, 4b, 4c twice, or combine the fold combination in Figures 3a, 3b, 3c with the fold combination in Figures 4a, 4b, 4c. By“fold combination” is meant a sequence of two or more folds. It should be noted that the shape illustrated in Figure 2a can also be obtained by bending the carrier 4, as will be further discussed below in connection with the Figures 1 la and 1 lb.

Figures 3a, 3b and 3c form a sequence (from left to right) and show an example of a fold combination. First, the carrier 4 is folded along a first folding line h that makes approximately 90° with the longitudinal axis A of the carrier 4, the longitudinal axis A being a geometrical axis. This may be referred to a valley fold, using origami terminology. The carrier 4 is here folded 180° about the first folding line b_. Then, the carrier 4 is folded along a second folding line l₂ that makes approximately 45° with the longitudinal axis A of the carrier 4. This may also be referred to as a valley fold. The carrier 4 is here folded 180° about the second folding line l_2. As illustrated in Figure 3c, the result of this fold combination is that the carrier 4 forms an L-like shape. An angle 0 of approximately 90° is formed by the carrier 4. The angle 0 is located where the“legs” of the L meet. Thus, the result of this fold combination is that the two emitting portions that are separated by the folded non-emitting portion 4b are substantially perpendicular to each other.

Figures 4a, 4b and 4c form a sequence (from left to right) and show another example of a fold combination. First, the carrier 4 is folded along a first folding line li’ that makes approximately 90° with the longitudinal axis A of the carrier 4. This may be referred to a mountain fold, using origami terminology. The carrier 4 is here folded 180° about the first folding line li’_. Then, the carrier 4 is folded along a second folding line l₂’ that makes approximately 45° with the longitudinal axis A of the carrier 4. This may be referred to as a valley fold. The carrier 4 is here folded 180° about the second folding line l₂’. As illustrated in Figure 4c, the result of this fold combination is that the carrier 4 forms an L-like shape. An angle Q’ of approximately 90° is formed by the carrier 4. The angle Q’ is located where the “legs” of the L meet. Thus, the result of this fold combination is that the two emitting portions that are separated by the folded non-emitting portion 4b are substantially perpendicular to each other.

Figures 5a, 5b and 5c form a sequence (from left to right) and show yet another example of a fold combination. First, the carrier 4 is folded along a first folding line li” that makes approximately 45° with the longitudinal axis A of the carrier 4. This may be referred to as a valley fold. The carrier 4 is here folded 180° about the first folding line h” . Then, the carrier 4 is folded along a second folding line l₂” that makes approximately 45° with the longitudinal axis A of the carrier 4. This may be referred to as a mountain fold. The carrier 4 is here folded 180° about the second folding line l₂”. As illustrated in Figure 5c, the result of this fold combination is that the two emitting portions that are separated by the folded non-emitting portion 4b are substantially parallel to each other.

It should be noted that there are of course many other ways of folding the carrier 4 than those shown in Figures 3a to 5c. In particular, a folding line along which the carrier 4 is folded does not have to make 45° or 90° degrees with the longitudinal axis A, as the lines li, li’, li”, k, b’, I2” in Figures 3a to 5c, but can make another angle with the longitudinal axis A.

Figures 6 shows an example of a light-emitting device 10 which is similar to the light-emitting device 2 discussed above with reference to Figures 1 to 5c, but the distance between the light sources 6 is not the same on every emitting section of the carrier 4. In the example illustrated in Figure 6, the distance decreases from the left towards the middle and from the right towards the middle, i.e. di>d2>d3. The distances between the light sources 6 may of course vary in some other manner in a different example. It is noted that all of the light-emitting devices discussed herein can have varying distances between the light sources.

Figure 7 shows an example of a light-emitting device 20 which is similar to the light-emitting devices 2, 10 discussed above with reference to Figures 1 to 6, but the carrier 4 of the light-emitting device 20 is adapted such that the length of the carrier 4 is minimized. More specifically, the non-emitting sections of the carrier 4, where the carrier 4 is folded, and the positions of the light sources 6 are adapted such that the length of the carrier 4 is minimized.

Figure 8 shows an example of a light-emitting device 30 that is similar to the light-emitting devices 2, 10, 20 discussed above with reference to Figures 1 to 7, but the carrier 4 has been folded into a spiral. The spiral here has three loops. Some of the light sources 6 are located at the corners of the spiral, but this may or may not be the case in a different example.

Figures 9 shows an example of a light-emitting device 40 that is similar to the light-emitting devices 2, 10, 20, 30 discussed above with reference to Figures 1 to 8, but the light sources 6’ on the carrier 4 of the light-emitting device 40 in Figure 9 are elongated.

Each light source 6’ is in this case arranged such that its major axis M is pointing

substantially towards the center P of the two-dimensional pattern formed by the light sources 6’. Thus, the light sources 6’ are radially arranged. Each light source 6’ here has a minor axis (not shown) which is perpendicular to the major axis M. It is noted that all of the light- emitting devices discussed herein can have elongated light sources. It is also noted that, in a different example, the elongated light sources 6’ do not have to be radially arranged but can be arranged in some other way. For example, the elongated light sources 6’ may be arranged such that the major axis M is perpendicular to the longitudinal axis of the carrier 4.

Figure 10 shows an example of a light-emitting device 50 that is similar to the light-emitting devices 2, 10, 20, 30, 40 discussed above with reference to Figures 1 to 9, but the light-emitting device 50 comprises jumpers 51. The jumpers 51 are here mounted on the non-emitting sections of the carrier 4. The jumpers 51 are mounted at locations on the carrier 4 where light sources 6 could have been mounted instead. The jumpers 51 electrically connect conductive tracks 52 on the carrier 4.

With reference to Figures 1 la and 1 lb, an example of a light-emitting device 60 will be described. Figure 1 la shows the light-emitting device 60, and Figure 1 lb shows the carrier 4 of the light-emitting device 60 in a straight, pre-bent state. The light-emitting device 60 is similar to the light-emitting devices 2, 10, 20, 30, 40, 50 discussed above with reference to Figures 1 to 10, except for a few differences.

The carrier 4 of the light-emitting device 60 has in this case the shape of a polygon, more precisely a square. The carrier 4 here has four emitting sections 4a and four non-emitting sections 4b. Each non-emitting section has a notch 61. In this case, each notch 61 has a triangular shape. The notches 61 may for example be obtained by removing parts of the carrier 4 in some way, such as by cutting or tearing along perforation lines. In this case, there is a connection portion 62 located close to each notch 61. The connection portions 62 are here thin parts that remain of the non-emitting sections 4b after the notches 61 have been formed. The connection parts 62 serve as hinges and connect portions of the non-emitting sections 4b that are located on different sides of the notches 61, as seen along the longitudinal axis A of the carrier 4.

On each emitting section 4a, the light sources 6 are arranged on a circle C. (Only a part of the circle C is shown in Figure 1 lb.) In the illustrated example, there are three light sources 6 on each emitting section 4a. One of the light sources 6 is displaced relative to the other two in a direction perpendicular to the longitudinal axis A. Specifically, on each emitting section 4a, the light source 6 in the middle is here positioned on one side of the longitudinal axis A, and the other two light sources 6 are here positioned on the other side of the longitudinal axis A.

The positions of the light sources 6 are such that, after the straight carrier 4 (see Figure 1 lb) has been bent into a square (see figure 1 la), the two-dimensional pattern formed by the light sources 6 is a ring. The dashed arrow 63 indicates how the carrier 4 is bent at one of the notches 62. The carrier 4 is bent in the plane of the carrier 4. The outer contour 7’ is here a polygon with twelve sides.

It should be noted that although the ring in Figure 1 lb has one“row” of light sources 6, the ring may have more than one“row” of light sources 6 in a different example. The number of such“rows” may for example be two, three, four or more than four. It should also be noted that a light-emitting device such as that shown in Figure 1 la can be obtained by folding, instead of bending, a carrier.

The person skilled in the art realizes that the present invention by no means is limited to the preferred embodiments described above. On the contrary, many modifications and variations are possible within the scope of the appended claims. For example, the light- emitting device according to the present invention is suitable for use in not only ceiling- mounted luminaires, such as the one shown in Figure 1, but also in many other types of lighting applications, such as wall-mounted luminaires, recessed ceiling fixtures, various types of lamps and modules for lighting applications. Some examples of further variations and modifications that are possible within the scope of the appended claims are described below.

The light-emitting device may comprise a first emitting section with M light sources, a second emitting section N light sources, a third emitting section with O light sources, and a fourth emitting section with P light sources, wherein M<N and 0>P.

Typically, M equals P, and N equals O, i.e. M=P and N=0.

The light-emitting device may comprise a first emitting section with M light sources, a second emitting section N light sources, a third emitting section with O light sources, a fourth emitting section with P light sources, a fifth emitting section with Q light sources, and a sixth emitting section with R light sources, wherein M<N, N<0, P>Q, and Q>R. Typically, M equals R, N equals Q, and O equals P, i.e. M=R, N=Q, and 0=P. The light-emitting device in Figure 2a, for instance, has M=R=2, N=Q=4, and 0=P=6.

The light-emitting device may comprise a first emitting section with M light sources, a second emitting section N light sources, a third emitting section with O light sources, a fourth emitting section with P light sources, a fifth emitting section with Q light sources, a sixth emitting section with R light sources, a seventh emitting section with S light sources, and an eight emitting section with T light sources, wherein M<N, N<0, 0<P, Q>R, R>S, and S>T. Typically, M equals T, N equals S, O equals R, and P equals Q, i.e. M=T, N= S, 0=R, and P=Q.

The light-emitting device may comprise an emitting section with four light sources arranged on a circle, wherein: a first light source is placed left of the longitudinal axis of the carrier; a second light source is placed right of the longitudinal axis; a third light source is placed right of the longitudinal axis; and a fourth light source is placed left of the longitudinal axis.

The light-emitting device may comprise an emitting section with five light sources arranged on a circle, wherein: a first light source is placed left of the longitudinal axis; a second light source is placed on the longitudinal axis; a third light source is placed right of the longitudinal axis; a fourth light source is placed on the longitudinal axis; and a fifth light source is placed left from the longitudinal axis.

Additionally, variations to the disclosed embodiments can be understood and effected by the skilled person in practicing the claimed invention, from a study of the drawings, the disclosure, and the appended claims. In the claims, the word“comprising” does not exclude other elements or steps, and the indefinite article“a” or“an” does not exclude a plurality. The mere fact that certain measures are recited in mutually different dependent claims does not indicate that a combination of these measured cannot be used to advantage.

Claims

CLAIMS:

1. A light-emitting device (2; 10; 20; 30; 40; 50; 60) comprising:

an elongated, flexible carrier (4); and

a plurality of solid-state light sources (6; 6’) mounted on the carrier

(4),

wherein the carrier (4) has a plurality of longitudinal, emitting sections (4a) separated by longitudinal, non-emitting sections (4b), each emitting section (4a) having at least one of the solid-state light sources (6; 6’) mounted thereon, and each non emitting section (4b) having no solid-state light sources mounted thereon,

wherein the carrier (4) has been folded along a first folding line h forming a valley fold and along a second folding line h forming a mountain fold in a predetermined manner at the non-emitting sections (4b) so that the carrier (4) after folding is planar and the solid-state light sources (6; 6’) form a two-dimensional pattern having a predefined outer contour (7; 7’).

2. The light-emitting device (2; 10; 20; 30; 40; 50) according to claim 1, wherein the two-dimensional pattern is having an outer contour (7; 7’) which is approximately circular.

3. The light-emitting device (2; 10; 20; 30; 40; 50) according to claim 1 or 2, wherein the two-dimensional pattern is a ring or a polygon having at least six sides.

4. The light-emitting device (2; 10; 20; 30; 40; 50) according to any of the preceding claims, wherein the two-dimensional pattern comprises rows and columns.

5. The light-emitting device (60) according to any one of the preceding claims, wherein each emitting section (4a) has at least two solid-state light sources (6) which are displaced relative to each other with respect to a longitudinal axis (A) of the carrier (4).

6. The light-emitting device (60) according to claims 4 and 5, wherein the solid- state light sources (6) on each emitting section (4a) are arranged on a circle (C).

7. The light-emitting device (2; 10; 20; 30; 40; 50) according to any one of the preceding claims, wherein at least two of the emitting sections (4a) have different numbers of solid-state light sources (6; 6’) mounted thereon.

8. The light-emitting device (10) according to any one of the preceding claims, wherein a distance between solid-state light sources (6) on one of the emitting sections (4a) is different from a distance between solid-state light sources (4a) on at least one other emitting section (4a).

9. The light-emitting device (40) according to any one of the preceding claims, wherein at least one of the solid-state light sources (6’) is elongated and has a major axis (M) or a minor axis is pointing towards a center (P) of the two-dimensional pattern.

10. The light-emitting device (2; 10; 20; 30; 40; 50; 60) according to any one of the preceding claims, wherein the carrier (4) has been folded or bent into one of: a polygonal shape; a spiral shape; and a meander shape.

11. The light-emitting device (60) according to any one of the preceding claims, wherein at least one of the non-emitting sections (4b) is provided with a notch (61), and wherein the carrier (4) has been bent at the notch (61) in a plane of the carrier (4).

12. The light-emitting device (60) according to claim 11, wherein a non-emitting section (4b) provided with a notch (61) has a connection portion (62), wherein the connection portion (62) connects portions of said non-emitting section (4b) on different sides of the notch (61) and serves as a hinge.

13. The light-emitting device (50) according to any one of the preceding claims, wherein the carrier (4) comprises electrical circuitry (52) with mounting sites for solid-state light sources (6), and wherein at least one of the mounting sites is short circuited by a jumper (51).

14. A luminaire (1) comprising the light-emitting device according to any one of the preceding claims.

15. A method for producing a light-emitting device (2; 10; 20; 30; 40; 50; 60), comprising:

mounting a plurality of solid-state light sources (6; 6’) on an elongated, flexible carrier (4) such that the carrier (4) has a plurality of longitudinal, emitting sections (4a) separated by longitudinal, non-emitting sections (4b), each emitting section (4a) having at least one of the solid-state light sources (6; 6’) mounted thereon, and each non- emitting section (4b) having no solid-state light sources mounted thereon; and

folding the carrier (4) along a first folding line b forming a valley fold and along a second folding line l₂ forming a mountain fold in a predetermined manner at the non-emitting sections (4b) so that the carrier (4) after folding is planar and the solid-state light sources (6; 6’) form a two-dimensional pattern having a predefined outer contour (7;

T).