WO2017025246A1

WO2017025246A1 - Light-emitting diode arrangement and method for the production thereof

Info

Publication number: WO2017025246A1
Application number: PCT/EP2016/065602
Authority: WO
Inventors: Farhang Ghasemi Afshar
Original assignee: Osram Gmbh
Priority date: 2015-08-11
Filing date: 2016-07-01
Publication date: 2017-02-16
Also published as: DE102015215301A1

Abstract

A light-emitting diode arrangement (10) is provided in various embodiments. The light-emitting diode arrangement (10) has: a first substrate; a second substrate which is arranged on the first substrate (12) and has at least one first conductor track (36); a first light-emitting diode string (40) (20) having a plurality of first light-emitting diodes (40) which are arranged on the first substrate (12) and are electrically connected in series, wherein at least two of the first light-emitting diodes (40) are electrically connected in series by means of the first conductor track (36) of the second substrate (16); and at least one second light-emitting diode string (22) having a plurality of second light-emitting diodes (42) which are arranged on the second substrate (16) and are electrically connected in series.

Description

description

Light emitting diode arrangement and method for producing a light emitting diode array

The invention relates to a light emitting diode array and a method for producing a light emitting diode array.

In a conventional light emitting diode array, a plurality of light emitting diodes, in particular LEDs, on a substrate

arranged and with electrical wires on the

Substrate are formed, electrically connected. The LEDs may be electrically connected in parallel and / or electrically in series. For example, the LEDs of one group of LEDs may be electrically connected in series, the LEDs of another group of LEDs may be electrically connected in series, and the two groups may be electrically connected in parallel. The LEDs can be identical or identical

be formed differently. For example, a group of LEDs may be surface emitting light emitting diodes

typically having an electrical contact on its top and an electrical contact on its top

Bottom, and another group of LEDs may have volume-emitting LEDs, the

typically both electrical contacts on their

Have top. Furthermore, one group of LEDs may comprise blue light emitting diodes and another group of LEDs may comprise red light emitting diodes. The substrate may, for example, a

Metal core board or have a ceramic body on which the electrical lines for electrically contacting the LEDs are formed.

One or more conversion layers can be formed over the LEDs. For example, over a first

Group of LEDs may be formed a first conversion layer and over a second group of LEDs may be formed a second conversion layer. The conversion layers can each have a carrier material in the

Converter material is embedded. The converter material may comprise converter particles. Alternatively, the

Conversion layers may be formed from the converter material. The converter material is suitable for converting light with respect to its wavelength. For example, the LEDs of a group of LEDs emit blue light that

Converter material absorbs at least a portion of the blue light and emits yellow or mint colored light. The yellow or mint-colored light mixes with the remaining unconverted blue light, which can produce white light. Alternatively, the blue light may be converted to yellow light by the converter material, and the blue light may be converted to blue-white (Bluish-White) light by another converter material, thereby producing adjustable or tunable white light.

Furthermore, green light can be generated with a first group of LEDs, for example by means of blue light

emitting LEDs and a conversion layer that absorbs the blue light and emits the green light, with a second group of LEDs, red light can be generated, for example directly or by means of a

corresponding conversion layer, and with a third group of LEDs, for example, direct, blue light or by means of a corresponding conversion layer white light can be generated.

Due to the electrical coupling of the LEDs within a group, the LEDs are preferably close to one group

adjacent to each other, for example in the form of linearly extending light-emitting diode strands arranged. If two neighboring light-emitting diode strands, with or without a corresponding conversion layer, produce light of different color, this leads to a certain mixing of the light, but the degree of light mixing achieved thereby can not be sufficient in some applications For example, in the case of using a non-faceted and / or smooth reflector for reflecting the mixed light. In particular, this can be done at a

Projection of the mixed light on a surface to areas of different colors and / or lead to a rainbow effect.

The light mixture can be improved by the

Light-emitting diodes are applied directly to the substrates (chip-on-board technology), rather than using LEDs packed in separate housings on the substrate.

In particular, this can reduce the distance between emission sites of different color, which leads to a better light mixture.

Fig. 1 shows a plan view of a conventional

Light-emitting diode arrangement 1. The conventional

Light-emitting diode arrangement 1 has a substrate 2 with an optically active region 3. The optically active region 3 is circular in plan view of the substrate 2 and surrounded by a dam 4 in the lateral direction. The conventional light-emitting diode arrangement 1 has two conventional first light-emitting diode strands 6 and two conventional second light-emitting diode strands 8. By means of the conventional first light-emitting diode strands 6 blue light is generated by means of LEDs which emit blue light and have sapphire chips and which are electrically coupled from chip to chip and

in particular electrical series are connected. By means of the conventional second light-emitting diode strands 8, blue light is generated by LEDs which emit blue light and have sapphire chips and which are electrically coupled from chip to chip and in particular are connected in electrical series, and the blue light is converted into green light by means of a conversion layer , The conventional ones

Light-emitting diode strands 6, 8 are linear and parallel to each other. In a plan view of the conventional

Light-emitting diode arrangement 1 or in a projection of the light generated by the conventional light-emitting diode array 1 on a surface are still at least in some areas, the different light colors, especially blue and green, recognizable. In particular, the different colors in the form of the parallel lines are the conventional ones

Light-emitting diode strands 6, 8 visible. The light mixture can be further improved by means of a scattering layer for scattering the light emitted by the light-emitting diode strands. However, such a scattering layer has a negative effect on the efficiency of the corresponding light-emitting diode arrangement.

An object of the invention is to provide a light-emitting diode arrangement which generates light of different color and mixes the generated light, whereby a particularly high degree of color mixing and / or light mixing is achieved in a simple manner, and / or which is particularly efficient and / or is particularly easy and / or inexpensive to produce.

An object of the invention is to provide a method for

Producing a light emitting diode array to provide that is particularly simple and / or inexpensive to carry out and / or that contributes to the light emitting diode array is particularly efficient and / or generates light of different colors and mixes the generated light, in a simple way, a particularly high degree of color mixing and / or light mixture is achieved.

An object is achieved according to an aspect of the invention by a light-emitting diode arrangement having a first substrate; a second substrate disposed on the first substrate

is arranged and which has at least one first conductor track; a first light emitting diode string having a plurality of first light emitting diodes disposed on the first substrate and electrically connected in series, wherein at least two of the first light-emitting diodes by means of the first conductor track of the second substrate electrically in series

are switched; and at least a second

Light-emitting diode strand having a plurality of second light-emitting diodes which are arranged on the second substrate and the

are electrically connected in series.

The electrical contacting of the first light emitting diodes of the first light emitting diode strand via the conductor track of the second substrate allows the first and the second

To arrange LED array particularly close to each other and / or to arrange the first and the second light-emitting diode strand so that they intersect. If the first

Light-emitting diodes emit light of a different color than the second light-emitting diodes or light of the same color

emit, which, however, subsequently in light

different color is converted, in particular by means of one or two corresponding conversion layers, so this can be arranged particularly close to each other

Light-emitting diode strands and / or crossing the

Light-emitting diode strands contribute to a particularly good color mixing, especially at the substrate level and / or without or even before a litter layer. The light emitting diode array then emits a total of mixed light, which may be, for example, white light having a high degree of color mixing.

For example, the first light emitting diodes may emit first light and the second light emitting diodes may emit second light. For example, the first light may be blue light, and the second light may be red light, for example. Alternatively, the first and second lights may be blue light. Depending on the first and / or the second light-emitting diodes may each have a conversion layer is formed, which converts the emitted first and / or second light in red, green, white or blue-white light. The first light emitting diodes may be, for example, volume emitting light emitting diodes and the second light emitting diodes For example, be surface emitting LEDs. Alternatively, the first and second light emitting diodes may be volume emitting light emitting diodes. In addition to the first light-emitting diode string, one, two or more further first light-emitting diode strands can be arranged on the first substrate, in which case the second substrate has one, two or correspondingly more further first conductor tracks for electrically connecting the corresponding first light-emitting diode strands in series. The other first

Light-emitting diode strands likewise have first light-emitting diodes, ie light-emitting diodes which are identical in construction to the first ones

Light-emitting diodes of the first light-emitting diode strand, and / or the same conversion layers are optically connected downstream and by means of which the first light is generated. In this application, all light-emitting diode strands, the

contribute to produce light of a first color, referred to as the first light-emitting diode strands. In addition to the second light-emitting diode string, one, two or more further second light-emitting diode strands may be arranged on the second substrate. The other second

Light-emitting diode strands likewise have second light-emitting diodes, that is to say light-emitting diodes which are identical in construction to the second ones

LEDs of the second light-emitting diode strand and / or the same conversion layers are optically connected downstream and by means of which the second light is generated. In other words, in this application, all light-emitting diode strands which contribute to producing light of a second color are referred to as second light-emitting diode strands.

Apart from the tracks, electrical conductors are used to electrically connect in series the LEDs of one of the light emitting diode strands. For example, the light-emitting diodes are electrically connected in series within a light-emitting diode strand by means of the electrical conductors, if this is not done by means of one of the conductor tracks. The electrical conductors may be, for example, electrically conductive wires, For example, be metal wires, such as bonding wires, in particular gold and / or copper wires.

The first substrate may, for example, comprise metal, in particular the first substrate may be a metal-core board. The second substrate may be, for example, ceramic

or be formed of ceramic.

According to a development, the light-emitting diode arrangement has at least one third light-emitting diode string, which has a plurality of third light-emitting diodes which are arranged on the first substrate and which are connected electrically in series. The second substrate has at least one second conductor track. At least two of the third light-emitting diodes are connected by means of the second conductor track electrical series. By means of the third light-emitting diode strand light of a third color, in particular third light can be generated. The third light may be mixed with the first and / or the second light.

In addition to the third light-emitting diode string, one, two or more further third light-emitting diode strands can be formed, in which case the second substrate one, two or

according to more more second traces to

electrical in series switching of the corresponding third light-emitting diode strands has. The other third

Light-emitting diode strands likewise have third light-emitting diodes, that is to say light-emitting diodes which are identical in construction to the third ones

Light-emitting diodes of the third light-emitting diode strand, and / or the same conversion layers are optically connected downstream and by means of which light of the same color is generated. In other words, in this application, all

Light-emitting diode strands, which help to produce light of a third color, referred to as third light-emitting diode strands.

For example, the third light emitting diodes may emit the third light. The third light may be, for example, blue or red light. About the third light-emitting diodes can a conversion layer may be formed which converts the emitted third light into red, green, white or blue-white light. The third light emitting diodes may be, for example, volume emitting or surface emitting light emitting diodes. Alternatively, the third light-emitting diodes can be electrically connected in series by means of the first conductor tracks.

According to a development, the second substrate is integrally formed. This can help the

Light-emitting diode arrangement particularly simple and / or

can be formed inexpensively. On the one-piece second substrate may be one, two or more of the second

Be arranged light-emitting diode strands. The second light-emitting diode strands on the second substrate may be crossed by one, two or more of the first light-emitting diode strands and / or by one, two or more of the third light-emitting diode strands, the second substrate correspondingly connecting first and second conductor tracks for electrical connection in series having the first and third light-emitting diode strands.

According to a development, the second substrate has a plurality of physically separate sub-substrates. On the sub-substrates, the second light-emitting diodes are arranged. The sub-substrates have the first and / or second

Conductor, for electrical in series switching of two first light-emitting diodes or two third light-emitting diodes on. This can help to make areas where light is

different color, especially close one another and / or can be mixed very well. This can be a particularly high degree

Contribute color mixture.

For example, on each sub-substrate at least one second light-emitting diode, in particular exactly one second

LED, be arranged. Furthermore, on each

Sub-substrate at least one first conductor and / or at least one second conductor, for example, exactly one first conductor and / or exactly one second conductor, be educated. Optionally, one, two or more

Partial substrates of the second substrate may be arranged on the first substrate, on which no second light-emitting diode and / or no first conductor track and / or no second conductor track is formed.

According to a development, the first light-emitting diode strand, the second one, intersect in a plan view of the first substrate

Light-emitting diode strand and / or the third light-emitting diode strand. This can contribute to a particularly high degree of color mixing of the light generated by the light emitting diode array. In other words, in a horizontal

Alignment of the substrates, the electrical conductors and / or the conductor tracks for connecting the intersecting

Light-emitting diode strands in the crossing point vertically one above the other. For example, the corresponding ones intersect

Light-emitting diode strands in plan view over the second substrate or optionally over its sub-substrates. According to a further development, the electrical conductors for electrical switching of the second light-emitting diodes and the printed conductors of the second substrates intersect in a plan view of the first substrate. In other words, in a horizontal orientation of the substrates run the electrical

Head for electrically connecting the second light-emitting diodes vertically over the first traces to the electrical

Connecting the first light emitting diodes and / or via the second conductor tracks for electrically connecting the third

LEDs. This allows a particularly simple way to cross the light-emitting diode strands. In particular, this allows that for crossing the light-emitting diode strands no

electrical conductors, in particular bonding wires, vertically above one another and / or must be arranged crossing each other. This contributes to the fact that the light-emitting diode arrangement can be produced in a simple manner and / or that the

Light-emitting diode arrangement is particularly robust against external forces. According to a development, the conductor tracks are L-shaped. This contributes to a particularly advantageous spatial distribution when forming the conductor tracks on the second substrate or its sub-substrates and / or when arranging the intersecting light-emitting diode strands.

According to a development, at least one of

Light-emitting diode strands from a conversion layer to

Convert light from the corresponding light-emitting diodes covered. This makes it possible to generate light of an additional color and / or to produce light of different colors when using identical light-emitting diodes. For example, the first light emitting diodes of a first

Conversion layer covered, the second light-emitting diodes are covered by a second conversion layer and / or the third light-emitting diodes are covered by a third conversion layer. In particular, exactly one conversion layer can be formed on each light-emitting diode strand. The

Conversion layers may each comprise a carrier material in which corresponding converter particles are embedded. Alternatively, one, two or all three

Conversion layers may be formed of converter material. The different conversion layers can be different

Have converter materials. In other words, by means of the various conversion layers, light

be produced according to different color.

For example, the conversion layers may be formed so that by means of them, green, red, white or blue ^¬ white light can be generated. Optionally, the

Light-emitting diodes of one of the light-emitting diode strands may be covered by an optically transparent layer.

According to a development, the first light-emitting diode string and / or the second light-emitting diode string with one each

Conversion layer covered and the second substrate serves as a spatial boundary for the conversion layer. This can contribute to the light emitting diode arrangement and in particular to form the conversion layers in a particularly simple and / or cost-effective manner.

According to one development, at least one of

Light-emitting diode strands in a lateral direction in a straight line. This can contribute to a particularly simple and / or cost-effective forming of the light-emitting diode arrangement.

According to a further development, in a plan view of the first substrate, the first light-emitting diode strand and the third light-emitting diode strand run parallel to one another and the second one

Light-emitting diode strand runs in the direction perpendicular to the first light-emitting diode strand and the third light-emitting diode strand. This can contribute to a particularly high degree of color mixing.

According to one development, at least one of

Light-emitting diode strands bent in lateral direction. This can contribute to a particularly high degree of color mixing.

The object is achieved according to a further aspect of the invention by a method for producing the

Light emitting diode arrangement, wherein the first substrate

provided, for example, is formed; the second substrate having at least the first conductive pattern is disposed on the first substrate; several of the first

Light-emitting diodes are arranged on the first substrate and

electrically connected in series, so that they form the first light-emitting diode strand, wherein at least two of the first light-emitting diodes by means of the first conductor track of the second

Substrate are electrically connected in series; and a plurality of the second light emitting diodes are disposed on the second substrate and electrically connected in series to form the second light emitting diode string.

The above in connection with the

Light emitting diode arrangement explained developments and

Advantages can be easily further developments and Advantages of the method of manufacture

Light emitting diode arrangement to be transmitted

The above-mentioned process steps can be carried out in the above-mentioned order or in a different order. For example, firstly the first light-emitting diodes can be arranged on the first substrate and / or the second light-emitting diodes can be arranged on the second substrate, and then the second substrate can be arranged on the first substrate. Alternatively, first, the second substrate may be disposed on the first substrate, and then the light emitting diodes may be placed on the first substrate

corresponding substrates are arranged. Furthermore, first the first light-emitting diodes can be arranged on the first substrate, then the second substrate on the first one

Substrate are arranged and then the second light-emitting diodes are arranged on the second substrate.

According to a development, the second are first

Light emitting diodes arranged on the second substrate, then the second substrate is disposed on the first substrate and then the first light emitting diodes are electrically connected to the first conductor track. This can contribute to a particularly simple and / or cost-effective production of the light-emitting diode arrangement.

According to a development, the second light-emitting diodes are tested on the second substrate. Subsequently, the second light emitting diodes and / or the second substrate are arranged on the first substrate depending on a test result of the test.

For example, the second light-emitting diodes can be tested with regard to the intensity and / or the color locus of the light you are emitting. In particular, the intensity or the color location of the corresponding emitted light can be detected. Depending on the detected intensity or the detected color location can then be decided whether the corresponding second light emitting diodes for the

Light emitting diode array can be used or not, and if yes, for which light-emitting diode arrangement specifically they should be used, where on the corresponding

Light emitting diode array they are to be arranged and / or with which conversion layer they are to be covered. For example, a deviation of the intensity and / or the color locus of the light emitted by the second LEDs can be compensated by means of adaptation of the corresponding conversion layer. According to a development, a material for forming at least one of the conversion layers in liquid

Condition applied to the first substrate such that it is bounded in the lateral direction of the second substrate and does not flow on or over the second substrate. The material for forming the conversion layer is dried and / or cured on the first substrate, whereby the

corresponding conversion layer is formed. Illustratively speaking, the second substrate and / or its effect

Partial substrates as a dam for the liquid material

Conversion layer. This can contribute to a particularly simple and / or cost-effective production of the light-emitting diode arrangement

Optionally, such a conversion layer can be so

be formed so that it has a greater height in a dried and / or cured state relative to a surface of the first substrate than the second substrate, in which case the corresponding conversion layer as

Limiting and / or can serve as a dam for a liquid material for forming a further layer over the second substrate.

Embodiments of the invention are illustrated in the figures and are explained in more detail below.

Show it: Figure 1 is a plan view of a conventional

LED array;

Figure 2 is a plan view of an embodiment of a

LED array;

FIG. 3 shows a detailed view of the light-emitting diode arrangement according to FIG

Figure 2; Figure 4 is a plan view of an embodiment of a

LED array;

FIG. 5 shows a detailed view of the light-emitting diode arrangement according to FIG

Figure 4;

FIG. 6 is a detailed view of an embodiment of a

LED array;

Figure 7 is a detailed sectional view of a

Embodiment of a light emitting diode array;

Figure 8 is a detailed sectional view of a

Embodiment of a light emitting diode array; FIG. 9 is a flow chart of an embodiment of a

Method for producing a

LED array;

FIG. 10 is a flowchart of an embodiment of a

Method for producing a

Light-emitting diode arrangement.

In the following detailed description, reference is made to the accompanying drawings, which form a part of this specification, and in which is shown by way of illustration specific embodiments in which the invention may be practiced. Because components of

Embodiments in a number of different Orientations can be positioned, the serves

Directional terminology for illustration and is in no way limiting. It is understood that other embodiments may be utilized and structural or logical changes may be made without departing from

To deviate scope of the present invention. It should be understood that the features of the various embodiments described herein may be combined with each other unless specifically stated otherwise. The following detailed description is therefore not to be taken in a limiting sense, and the scope of the present invention is defined by the appended claims. In the figures are identical or similar

Elements provided with identical reference numerals, as appropriate.

A light emitting diode array may be two, three or more

Light emitting diodes (LED) have. Optionally, a light-emitting diode arrangement can also have one, two or more electronic components. An electronic component may have, for example, an active and / or a passive component. An active electronic component may have, for example, a computing, control and / or regulating unit and / or a transistor. One

passive electronic component may, for example, a capacitor, a resistor, a diode or a coil.

Fig. 1 shows a plan view of a conventional

Light-emitting diode arrangement 1. the conventional

Light-emitting diode arrangement 1 has a substrate 2 on which an optically active region 3 of the light-emitting diode arrangement 1 is formed. In the optically active region 3 of the conventional light-emitting diode device 1 generates the

conventional light emitting diode array 1 during its operation light. The optically active region 3 is bounded on the substrate 2 by a dam 4 in the lateral direction. The dam 4 is circular in plan view of the substrate 2. The conventional light emitting diode array 1 has two

conventional first light-emitting diode strands 6 and two

conventional second light-emitting diode strands 8. The

Conventional light-emitting diode strands 6, 8 are arranged in the optically active region 3 of the conventional light-emitting diode arrangement 1. The conventional light-emitting diode strands 6, 8 are linear and extend on the substrate 2 parallel to each other.

The conventional first light-emitting diode strands 6 have not shown in FIG. 1 first light-emitting diodes. The conventional second light-emitting diode strands 8 have second light-emitting diodes, not shown in FIG. The first and second light emitting diodes are blue light emitting

Light-emitting diodes and may be volume-emitting LEDs and / or sapphire chips. On or above the first

Light-emitting diodes of the conventional first light-emitting diode strands 6 are formed conversion layers, the

Have converter materials that convert the blue light emitted by the first light emitting diodes in blue-white (bluish-white) light. On or over the second

Light-emitting diodes of the conventional second light-emitting diode strands 8 are formed conversion layers, the

Have converter materials which convert the blue light emitted by the second light emitting diodes in green and red light. The blue-white light emitted by means of the first light-emitting diodes mixes with the green and red light generated by means of the second light-emitting diodes, whereby mixed light, in particular white light, is produced, which is emitted by the conventional light-emitting diode arrangement 1.

Due to the linear, parallel arrangement of the conventional light-emitting diode strands 6, 8, the blue and green light at the substrate level does not experience particularly good light mixing and has only a small degree of light mixture. This causes the parallel lines of the conventional light-emitting diode strands 6, 8 to be visible during operation of the conventional light-emitting diode arrangement 1, for example in plan view of the substrate 2 and / or in a projection of the generated mixed light onto a surface.

Fig. 2 shows a plan view of an embodiment of a light emitting diode array 10 and Fig. 3 shows a

Detail view of the light-emitting diode arrangement according to FIG. 2.

The light-emitting diode arrangement 10 has a first substrate 12. The first substrate 12 may be, for example, metal

or be formed of metal. For example, the first substrate 12 may be a metal core board.

The light-emitting diode arrangement 10 has an optically active region 13, in which during operation of the

Light-emitting diode array 10 light is generated and emitted. The optically active region 13 is surrounded in the lateral direction by a dam 14 and is bounded laterally by the dam 14. The dam 14 may for example comprise silicone or be formed from silicone. On the first substrate 12, a second substrate 16 is disposed in the optically active region 13. The second substrate 16 has a plurality of sub-substrates 18 or is made of the

Partial substrates 18 formed. Alternatively, the second substrate 16 may be integrally formed. The second substrate 16, in particular the sub-substrates 18, may comprise ceramic or be formed from ceramic. The second substrate 16, in particular the sub-substrates 18, is on the first one

Substrate 12 attached, for example by gluing. The second substrate 16 has at least one first conductor 36. The first conductor 36 is formed on the second substrate 16. In particular, each sub-substrate 18 has a corresponding first conductor track 36. Within the optically active region 13, a plurality of light-emitting diode strands extend in the lateral direction. The spatial characteristics of the light-emitting diode strands are identified in FIG. 1 by means of different lines. In FIG. 2, the light-emitting diode strands are characterized by the corresponding light-emitting diodes, as explained in more detail below.

In particular, the light-emitting diode arrangement 10 has a plurality of first light-emitting diode strands 20. The progressions of the first

Light-emitting diode strands 20 are shown in FIG. 1 by means of dotted lines. The first light-emitting diode strands 20

extend in Figure 1 essentially from left to right. The first light-emitting diode strands 20 each have a plurality of first light-emitting diodes 40 which are arranged along the corresponding dotted lines within the optically active region 13. The first light-emitting diodes 40 are arranged on the first substrate 12. The first light-emitting diodes 40 of one of the first light-emitting diode strands 20 are connected to each other electrical series. At least two each of the first light-emitting diodes 40 of the first light-emitting diode strands 20 are connected by means of one of the first conductor tracks 36 of the sub-substrates 18 electrical row.

The first light emitting diodes 40 emit blue light and are volume emitting light emitting diodes having sapphire chips. Alternatively, the first light emitting diodes 40 may emit light of a different color, such as red light, for example.

be surface emitting light emitting diodes and / or

Have thin-film chips.

In addition, the light-emitting diode arrangement 10 has two second ones

Light-emitting diode strands 22 on. The courses of the second

Light-emitting diode strands 22 are shown in FIG. 1 by means of dashed lines. The second light-emitting diode strands 22 run from top to bottom in FIG. 1 and intersect the first light-emitting diode strands 20. In particular, the second light-emitting diode strands 22 cross the first light-emitting diode strands 20 in plan view in the region of the sub-substrates 18. The second light-emitting diode strands 22 Light-emitting diode strands 22 have a plurality of second light-emitting diodes 42. The second light-emitting diodes 42 are on the second

Substrate 16 and its sub-substrates 18 arranged. The second light-emitting diodes 42 are connected to each other electrical series. The electric wires for electrically switching in series the second LEDs 42 intersect

Top view, the first traces 36 and extend vertically over the first traces 36. The second light-emitting diodes 42 emit red light and are surface emitting light-emitting diodes having thin-film chips. Alternatively, the second light emitting diodes 42 can emit blue light, be volume emitting light emitting diodes and / or have sapphire chips.

In addition, the light-emitting diode array 10 has third

Light-emitting diode strands 24. The courses of the third

Light-emitting diode strands 24 are shown in FIG. 1 with dashed-dot lines. The third light-emitting diode strands 24 have third light-emitting diodes 44. The third light-emitting diodes 44 are arranged on the first substrate 12. The third

Light-emitting diode strands 24 cross the second

Light-emitting diode strands 22. In particular, the third light-emitting diode strands 24 cross the second light-emitting diode strands 20 in plan view in the region of the second substrate 16, in particular in the regions of the sub-substrates 18

Light-emitting diodes 44 are mutually electric row

connected. Two of the third light-emitting diodes 44 of the third light-emitting diode strands 24 are electrically connected in series by means of the first conductor tracks 36 of the sub-substrates 18.

The third light emitting diodes 44 emit blue light and are volume emitting light emitting diodes having sapphire chips. Alternatively, the third light emitting diodes 44 may emit light of a different color, such as red light, surface emitting light emitting diodes, and / or

Have thin-film chips. The first light-emitting diode strands 20 extend outside of the sub-substrates 18 in first regions 30. The second

Light-emitting diode strands 22 extend on the sub-substrates 18, which define second regions 32. The third

Light-emitting diode strands 24 run outside of the sub-substrates 18 in third regions 34. Thus, the optically active region 13 of the light-emitting diode arrangement 10 is in the first

Areas 30, the second areas 32 and the third areas 34 divided. The first and third regions 30, 34 are laterally spaced from each other and from the second

Regions 32, in particular the second substrate 16 and its sub-substrates 18, limited.

In the areas 30, 32, 34, the corresponding

Light-emitting diodes 40, 42, 44 may be covered with various layers.

The layers can be, for example, transparent layers, translucent layers and / or conversion layers.

The conversion layers may comprise converter material.

By means of the converter material, that of the

corresponding light-emitting diodes 40, 42, 44 generated light

be converted in terms of its wavelength.

For example, blue light generated by the first light-emitting diodes 40 can be converted into red light by means of a corresponding conversion layer in the first regions 30. For example, by means of the third light-emitting diodes 44 generated blue light by means of a corresponding

Conversion layer in the third regions 34 are converted into green light. For example, by means of the second light emitting diodes 22 generated blue light can be converted with a corresponding conversion layer in blue-white light. This allows, by means of

Light emitting diode array 10 to produce and emit a mixed light that has a white color.

Alternatively, for example, by means of the first

LEDs 42 generated blue light with a

corresponding conversion layer in the first regions 30 be converted into blue-white light. For example, blue light generated by means of the third light-emitting diodes 44 can be converted into green light by means of a corresponding conversion layer in the third regions 34.

For example, red light generated by the second light emitting diodes 42 can not be converted by not covering the second light emitting diodes 42 at all or merely covering them with a transparent or translucent colorless layer. Also according to this example, 10 white light can be generated and emitted by the light emitting diode array.

The light emitting diode array 10 emits mixed light having a particularly high degree of light mixing. In other words, the light generated by means of the light-emitting diode arrangement 10 is mixed particularly well. This causes the different colors of the light generated by the light-emitting diodes 40, 42, 44 to be difficult or even unrecognizable in a plan view of the substrate 2 and / or in a projection of the light generated by the light-emitting diode arrangement 10 onto a surface. The very good

Light mixture or the particularly high degree of light mixing is achieved by the fact that the first and second

Light-emitting diode strands 20, 24 spatially intersect and spatially intersect the third and second light-emitting diode strands 24, 22.

Alternatively, it is possible to dispense with the third light-emitting diode strands 24 and / or instead of the third one

Light-emitting diode strands further first light-emitting diode strands 20 may be formed. Alternatively or additionally

only a second light-emitting diode strand 22 or it can be arranged more than two second light-emitting diode strands 22.

FIG. 4 shows a plan view of an exemplary embodiment of a light-emitting diode arrangement 10 which, for example, can largely correspond to the light-emitting diode arrangement 10 explained above, and FIG. 5 shows a detailed view of the light-emitting diode arrangement 10 according to FIG. 4. The third light-emitting diode strands 24 extend in a lateral direction on the first substrate 12 such that they cross the second light-emitting diode strands 22 via the same sub-substrates 18. In addition, the third light-emitting diode strands 24 on the same sub-substrates 18 also cross the first light-emitting diode strands 20.

The second substrate 16, in particular the sub-substrates 18, have second conductor tracks 38 which are formed on the corresponding sub-substrates 18. The second interconnects 38 serve to electrically connect two third light-emitting diodes 44 of the third light-emitting diode strands 24 in series. In plan view, the electrical conductors cross for electrical series connection of the first light emitting diodes 40 and the

electrical conductors for electrically connecting in series the second light emitting diodes 42 over the sub-substrates 18 the second conductive lines 38. In this embodiment, over every other of the sub-substrates 18 none of the first or third run

Light-emitting diode strands 20, 24. However, these sub-substrates 18 may continue to serve for arranging second light-emitting diodes 42. Optionally, these sub-substrates 18 can be formed without conductor tracks 36, 38. If no second light-emitting diodes 42 are to be arranged on these sub-substrates, these sub-substrates 18 can be omitted or merely as a boundary for the first and third regions 30, 34

be provided and / or arranged.

Since the first and the second light-emitting diode strands 20, 22, the second and the third light-emitting diode strands 22, 24 and the first and the third light-emitting diode strands 20, 24 spatially cross over the second substrate 12, the light generated by the light-emitting diode arrangement 10 is mixed particularly well and indicates a particularly high degree

Light mixture on. FIG. 6 shows a detailed view of an exemplary embodiment of a light-emitting diode arrangement 10, which for example is largely explained with reference to FIGS. 4 and 5

Light emitting diode array 10 may correspond. In the

Light emitting diode array 10 is the second substrate 16

formed in one piece and has no sub-substrates 18. The second substrate 16 has for each first

Light-emitting diode strand 20, the corresponding second

Light-emitting diode strand 22 crosses, depending on one of the first conductor tracks 36. The second substrate 16 has, for each of the third light-emitting diode strands 24, the corresponding second

LED strand 22 crosses, one each of the second

Tracks 38 on. In the embodiments explained above, the conductor tracks 36, 38 are each L-shaped. Alternatively, however, the tracks 36, 38 may have other shapes, such as linear, polygonal, or rounded shapes.

7 shows a detailed sectional view of an embodiment of a light-emitting diode arrangement 10,

for example, one of the above

Light-emitting diode arrangements 10. Above the first region 30, a first layer 50 is formed. Above the second region 32, a second layer 52 is formed. Over the third region 34, a third layer 54 is formed. The second substrate 16, in particular the sub-substrate 18, serves as a lateral spatial boundary for the first and the third layer 50, 54. The first and the third layer 50, 54 serve as a lateral boundary for the second layer 52.

For example, when producing the light-emitting diode arrangement 10, the second substrate 16 is firstly arranged on the first substrate 12. Then, the materials for the first layer 50 and the third layer 54 are applied in a viscous state to the first substrate 12 in such a way that they adjoin the second substrate 16 in a lateral direction, however, do not flow onto the second substrate 16. After the first and third layers 50, 54 are dried, the liquid material of the second layer 52 is filled in the recess formed by the first and third layers 50, 54 and subsequently dried and / or cured.

The light-emitting diodes 40, 42, 44 each emit blue light. The first layer 50 is a conversion layer which transmits the blue light of the first light-emitting diodes 40 in red light

converted. The third layer 54 is a

Conversion layer, which is the blue light of the third

LEDs 44 converted to green light. The second

Layer 52 is transparent or translucent or is a conversion layer that converts the blue light of the second light emitting diodes 42 into blue-white light. This makes it possible to produce and emit white light by means of the light-emitting diode arrangement 10.

Fig. 8 shows a detailed sectional view of a

Embodiment of a light-emitting diode array 10, for example, largely the reference to FIG. 7

explained light emitting diode array 10 may correspond.

The first and third light emitting diodes 40, 44 each emit blue light, and the second light emitting diodes 42 each emit red light. The first layer 50 is a

Conversion layer, which is the blue light of the first

LEDs 40 converted to blue-white light. The third layer 54 is a conversion layer that converts the blue light of the third light emitting diodes 44 into green light. The second layer 52 is transparent or translucent

educated. This allows, by means of

Light emitting diode array 10 to generate and emit white light.

9 shows a flow diagram of an embodiment of a method for producing a light-emitting diode arrangement 10, for example, one of the above

explained light emitting diode arrangements 10 corresponds.

In a step S2, a first substrate is provided, for example, the first substrate 12 is provided, in particular formed.

In a step S4, a second substrate is disposed on the first substrate, for example, the second substrate 16 is disposed on the first substrate 12. Optionally, in this step, the sub-substrates 18 are arranged on the first substrate 12.

In a step S6, first light emitting diodes are arranged on the first substrate, for example, the first

Light emitting diodes 40 arranged on the first substrate 12. The first light-emitting diodes 40 form the first light-emitting diode strands 20. The first light-emitting diodes 40 are thus on the first

Substrate 12 is arranged such that the first light-emitting diode strands 20, the second substrate 16, in particular the sub-substrates 18 intersect. Further, in step S6, the first

Light emitting diodes 40 are electrically connected in series with each other, in particular using a plurality of electrical conductors and the first interconnects 36 of the second substrate 16 and the sub-substrates 18th

Optionally, third light-emitting diodes can be arranged on the first substrate, for example, the third

Light emitting diodes 44 are arranged on the first substrate 12. Optionally, the third light-emitting diodes 44 form the third light-emitting diode strands 24. Optionally, the third light-emitting diodes 44 are arranged on the first substrate 12 in such a way that they surround the second substrate 16, in particular the

Cross sub-substrates 18. Furthermore, the third

Light-emitting diodes 40 are electrically connected in series with each other, in particular using a plurality of electrical conductors and the first interconnects 36 and / or the second Conductor tracks 38 of the second substrate 16 and the

Partial substrates 18.

In a step S8, second light-emitting diodes are arranged on the second substrate, for example the second light-emitting diodes 42 are arranged on the second substrate 16 or the sub-substrates 18. The second light emitting diodes 42 form the second light emitting diode strands 22. Further, in the step S8, the second light emitting diodes 42 may be electrically connected to each other in series using a plurality of electrical conductors.

Optionally, the second light emitting diodes 42 may be disposed on the second substrate 16 before the first light emitting diodes and / or the third light emitting diodes 40, 44 on the first

Substrate 12 are arranged.

For example, wires, in particular bonding wires and / or metal wires, for example silver or gold wires, can be used as electrical conductors for the electrical series connection of the light-emitting diodes 40, 42, 44.

In a step S10, one, two or more

Conversion layers on the light-emitting diode strands 20, 42, 24 in particular the LEDs 40, 42, 44 are formed. For example, the first layers 50, the second layers 52 or the third layers 54 may be in the

corresponding areas 30, 32, 34 are formed. In this case, the second substrate 16 or its sub-substrates 18 can serve as a spatial boundary for forming the first and third layers 50, 54 and the finished first and third layers 50, 54 can serve as a spatial boundary for forming the second layers 52, as above with reference to Figures 7 and 8 explained in more detail.

10 shows a flow diagram of an embodiment of a method for producing a light-emitting diode arrangement. In a step S12, a first substrate is provided, for example, the first substrate 12 is provided, in particular formed. In a step S14, second light-emitting diodes are arranged on a second substrate, for example the second light-emitting diodes 42 are arranged on the second substrate 16 or the sub-substrates 18. Further, in step S14, the second light emitting diodes 42 may be electrically connected to each other in series using a plurality of electrical conductors

are switched, in particular when the second substrate 16 is integrally formed.

In a step S16, the second light emitting diodes 42 on the second substrate 16 are tested. For example, a test voltage can be applied to the second light-emitting diodes 42 or the second light-emitting diodes 42 can be charged with a test current and, for example, a

electrical resistance of the corresponding second

Light emitting diodes 42 and / or an intensity or a color location of the light generated by means of the corresponding second light-emitting diodes 42 detected and / or measured and evaluated.

In a step S18, the second substrate 16 or

its sub-substrates 18 on the first substrate 12

arranged. The second light-emitting diodes 42 form the second light-emitting diode strands 22. Arranging the second substrate 16 or the sub-substrates 18 on the first substrate 12 and thus arranging the second light-emitting diodes 42 over the first substrate 12 can optionally depend on the evaluation of the test results of step S16 respectively. For example, second LEDs 42, the only one insufficient

Test result, sorted out and not be placed over the first substrate 12. Furthermore, second light-emitting diodes 42 can be used with respect to the measured intensity or

sorted and recorded with respect to the measured color locus

various light emitting diode assemblies 10 are distributed for different applications or on a single Light emitting diode array 10 are suitably distributed, so that a total of a light emitting diode array 10 is provided, the light has a desired intensity, a desired color location and / or a desired degree of color mixing.

In a step S20, first light emitting diodes are arranged on the first substrate, for example, the first

Cross sub-substrates 18. Furthermore, the third

Light-emitting diodes 40 are electrically connected in series with each other, in particular using a plurality of electrical conductors and the first interconnects 36 and / or the second interconnects 38 of the second substrate 16 and the

Partial substrates 18.

Optionally, the first light-emitting diodes 40 and / or the third light-emitting diodes 44 can be arranged on the first substrate 12 before the second substrate 16 and / or its

Sub-substrates 18 are arranged on the first substrate 12. For example, wires, in particular bonding wires and / or metal wires, for example silver or gold wires, can be used as electrical conductors for the electrical series connection of the light-emitting diodes 40, 42, 44.

In a step S22, one, two or more

corresponding areas 30, 32, 34 are formed. In this case, the second substrate 16 or its sub-substrates 18 can serve as a spatial boundary for forming the first and third layers 50, 54 and the finished first and third layers 50, 54 can be designed as spatial

Serve to limit the formation of the second layers 52, as explained in more detail above with reference to Figures 7 and 8.

The invention is not limited to those specified

Embodiments limited. For example, the light-emitting diode strands 20, 22, 24 shown can not only run in a straight line or at least in sections in a straight line but also in a curved manner. For example, the second

Luminous diode strands 22 in the embodiments shown in Figures 2 and 4 in the middle to be bent inwardly or outwardly, so that the intermediate first and third portions 30, 34 correspondingly shortened or

are extended. Alternatively or additionally, the

Areas 30, 32, 34 other than the shapes shown

exhibit. For example, the second sub-substrates 18 may be arbitrarily polygonal or round, for example, circular or elliptical, which is why the second regions 32 are accordingly polygonal or round, for example circular or elliptical, and the first and third regions 30, 34 are formed corresponding thereto.

Claims

claims

1. light-emitting diode arrangement (10), with

a first substrate (12),

a second substrate (16) disposed on the first substrate

(12) is arranged and has at least one first conductor track (36),

a first light-emitting diode string (20) which has a plurality of first light-emitting diodes (40) which are arranged on the first substrate (12) and which are electrically connected in series, at least two of the first light-emitting diodes (40) being connected by means of the first conductor track (36). of the second substrate (16) are electrically connected in series, and

at least one second light emitting diode string (22) having a plurality of second light emitting diodes (42) disposed on the second substrate (16) and electrically connected in series.

2. light emitting diode array (10) according to claim 1, with

at least one third light emitting diode string (24) having a plurality of third light emitting diodes (44) on the first

Substrate (12) are arranged and which are electrically connected in series, wherein the second substrate (16) has at least one second conductor track (38) and wherein at least two of the third light-emitting diodes (44) by means of the second

Conductor track (38) are connected electrical series.

3. light emitting diode array (10) according to any one of the preceding claims, wherein the second substrate (16) is integrally formed.

4. light-emitting diode arrangement (10) according to any one of claims 1 or 2, wherein the second substrate (16) a plurality of physically separate sub-substrates (18), wherein on the sub-substrates (18) the second light-emitting diodes (42) are arranged and wherein the Sub-substrates (18) the first and / or second conductor tracks (36, 38) for electrical in Series switching of two first light emitting diodes (40) or two third light emitting diodes (44).

5. light-emitting diode arrangement (10) according to any one of the preceding claims, wherein the first light-emitting diode string (20), the second light-emitting diode string (22) and / or the third

Crossing the light-emitting diode strand (24) in plan view onto the first substrate (12).

6. light-emitting diode arrangement (10) according to claim 5, wherein in plan view of the first substrate (12) electrical conductors for the electrical in series switching of the second light-emitting diodes (42) and the interconnects (36, 38) of the second substrates (16) intersect ,

7. light emitting diode array (10) according to any one of the preceding claims, wherein the conductor tracks (36, 38) L-shaped

are formed.

8. light-emitting diode arrangement (10) according to any one of the preceding claims, wherein at least one of the light-emitting diode strands (20, 22, 24) of a conversion layer (50, 52, 54) for converting light of the corresponding light-emitting diodes (40, 42, 44) covered is.

9. light-emitting diode arrangement (10) according to claim 8, wherein the first light-emitting diode string (20) and / or the second

Light-emitting diode strand (22) each having a conversion layer (50, 52, 54) are covered and in which the second substrate (16) serves as a spatial boundary for the conversion layers (50, 52, 54).

10. light-emitting diode arrangement (10) according to any one of the preceding claims, wherein at least one of the light-emitting diode strands (20, 22, 24) in the lateral direction is rectilinear.

11. Light-emitting diode arrangement (10) according to claims 2 and 10, wherein in plan view of the first substrate (12) of the first Light-emitting diode strand (20) and the third light-emitting diode strand (24) parallel to each other and the second

Light-emitting diode strand (22) in the direction perpendicular to the first light-emitting diode string (20) and the third light-emitting diode string (24).

12. light-emitting diode arrangement (10) according to one of claims 1 to 9, wherein at least one of the light-emitting diode strands (20, 22, 24) is bent in a lateral direction.

13. A method of manufacturing a light emitting diode array (10), wherein

a first substrate (12) is provided,

a second substrate (16) having at least one first trace (36) disposed on the first substrate (12),

a plurality of first light emitting diodes (40) are arranged on the first substrate (12) and electrically connected in series, so that they form a first light emitting diode strand (20), wherein at least two of the first light emitting diodes (40) by means of the first conductor track (36) of the second Substrate (16) are electrically connected in series, and

a plurality of second light-emitting diodes (42) on the second

Substrate (16) are arranged and electrically connected in series, so that they form a second light-emitting diode strand (22).

14. The method of claim 13, wherein first the second light-emitting diodes (42) are arranged on the second substrate (16), then the second substrate (16) is arranged on the first substrate (12) and then the first light-emitting diodes (40). electrically connected to the first conductor track (36).

15. The method of claim 14, wherein the second

Light emitting diodes (42) are tested on the second substrate (16) and in which the second light emitting diodes (42) and / or the second substrate (16) depending on a test result of the test on the first substrate (12) are arranged.

16. The method according to any one of claims 13 to 15, wherein a material for forming a conversion layer (50, 52, 54) in the liquid state over the first light-emitting diodes (40) on the first substrate (12) is applied, that it lateral direction of the second substrate (16) and does not flow on or over the second substrate (16) and wherein the material for forming the conversion layer (50, 52, 54) on the first substrate (12) dried and / or is cured, whereby the corresponding conversion layer (50, 52, 54) is formed.