LED filament arrangement

Abstract

: A LED filament arrangement comprises a plurality of LED filaments. The LED filaments comprise a respective carrier. On each carrier a plurality of LEDs are arranged together with a driver. The drivers are different from each other in terms of their architecture and / or the LED filaments are different from each other in terms of their architecture. 5

Description

[0001] 2025PF80065

[0002] 1

[0003] LED filament arrangement

[0004] FIELD OF THE INVENTION

[0005] The present invention generally relates to light emitting devices. More specifically, the present invention is related to a light emitting diode (LED) filament arrangement comprising encapsulated LED filaments and drivers.

[0006] BACKGROUND OF THE INVENTION

[0007] The original bulb lamps powered by electricity were of the type having metal wire filaments enclosed within more or less evacuated glass bulbs. This type of bulb lamps was the ubiquitous choice of light source for more than a century until the introduction of LEDs. Light sources based on LEDs have now replaced the light bulb as a source of light in homes and in many other locations. Initially, mainly due to the inherent structural characteristics of LEDs, the early LED light sources (i.e. LED lamps) did not resemble the earlier light bulbs and in many cases were considered as aesthetically inferior to a light bulb of the earlier type. Thus, for aesthetic reasons, a desire for light sources having the look of the traditional bulb shaped filament lamp came back when it was found that this was technically feasible to make light sources using LED filaments.

[0008] However, there still remain various aspects of such light sources using LED filaments. For example, there is still a need for improving the assembly, the functionality, performance and / or the appearance of light sources using LED filaments.

[0009] US 2020 / 332962 discloses a lighting apparatus that includes a first flexible filament with a first elongated flexible substrate. The first elongated flexible substrate is mounted with a first set of LED modules. The first set of LED modules includes LED modules of multiple colors. The second flexible filament with a second elongated flexible substrate. The second elongated flexible substrate is mounted with a second set of LED modules. The second set of LED modules include LED modules of multiple color temperatures.

[0010] US 2021 / 088189 discloses a flexible filament light bulb apparatus includes a first power wire, a second power wire, a first LED filament, a second LED filament, and a driver. A first end of the first LED filament is connected to the first power electrode. A fourth2025PF80065

[0011] 2

[0012] end of the second LED filament is connected to a second power electrode. The second end of the first LED filament is connected to the third end of the second LED filament. A driver is used for converting an external power source to a driving current supplied to the first power electrode and the second power electrode.

[0013] SUMMARY OF THE INVENTION

[0014] It is of interest to provide a LED filament arrangement that is capable of overcoming drawbacks of prior art devices.

[0015] This and other objects are achieved in a first aspect by providing a LED filament arrangement having the features of the appended independent claim. Preferred embodiments are defined in the appended dependent claims.

[0016] Hence, according to the present invention there is provided a LED filament arrangement configured to, in operation, provide LED filament arrangement light, the LED filament arrangement, comprising a plurality of LED filaments. The plurality of LED filaments comprises at least a first LED filament configured to provide, in operation, first LED filament light and a second LED filament configured to provide, in operation, second LED filament light. The LED filament arrangement light comprises one or more of the first LED filament light and the second LED filament light. The first LED filament light comprises one or more of the first converted light, the first scattered light, and part of the first LED light. The second LED filament light comprises one or more of the second converted light, the second scattered light, and part of the second LED light.

[0017] The first LED filament comprises a first array of a plurality of first LEDs arranged on a first major surface of a first elongated carrier, and a first elongated encapsulant at least partly enclosing the plurality of first LEDs and at least partly covering the first major surface of the first elongated carrier. The first elongated encapsulant comprises at least one of a first luminescent material configured to at least partly convert first LED light emitted by the first plurality of first LEDs into first converted light and a first light-scattering material configured to at least partly scatter first LED light emitted by the first plurality of first LEDs into first scattered light.

[0018] The second LED filament comprises a second array of a plurality of second LEDs arranged on a first major surface of a second elongated carrier, and a second elongated encapsulant at least partly enclosing the plurality of second LEDs and at least partly covering the first major surface of the second elongated carrier. The second elongated encapsulant comprises at least one of a second luminescent material configured to at least partly convert2025PF80065

[0019] 3

[0020] second LED light emitted by the second plurality of second LEDs into second converted light and a second light-scattering material configured to at least partly scatter second LED light emitted by the second plurality of second LEDs into second scattered light.

[0021] Furthermore, the first LED filament comprises a first driver arranged on the first elongated carrier and configured to control a first current through the first plurality of first LEDs. The second LED filament comprises a second driver arranged on the second elongated carrier and configured to control a second current through the second plurality of second LEDs.

[0022] The first driver is different in architecture from the second driver. Also or alternatively, the first LED filament has an architecture different from the second LED filament. In some embodiments, the first driver is different in architecture from the second driver and the first LED filament has an architecture different from the second LED filament.

[0023] Such a LED filament arrangement having architecturally different drivers arranged on respective carriers together with respective LED arrays and / or having architecturally different LED filaments enables an improved assembly, functionality, performance and / or appearance. For example, the drivers may be identical in topology but specifically tuned for each respective LED filament. In terms of topology, an easy to reach location of a component such as a resistor can be used to set a desired current to flow as desired during assembly. Moreover, having different driver architectures allows different configurations of duty cycle or the current amplitude with the binning device. It is known which configuration of LED filaments are to be combined with a main power converter. The duality or multitude of drivers allow tuning of the total circuit to be optimized in the factory, preferably before assembly.

[0024] In some embodiments, the first driver is different in architecture from the second driver by any one or more of: the first driver comprises at least one driver component and / or driver component type that is of a different type than a type of any component among components of the second driver and / or the second driver comprises at least one driver component and / or driver component type that is of a different type than a type of any component among components of the first driver.

[0025] In some embodiments, the first driver is different in architecture from the second driver in that the first driver comprises components arranged spatially on the first carrier according to a first topology and the second driver comprises components arranged spatially on the second carrier according to a second topology. In such embodiments, the first topology is different than the second topology.2025PF80065

[0026] 4

[0027] In some embodiments, the first driver is different in architecture from the second driver in that the first driver comprises components configured to provide first electric output to the first array of a plurality of first LEDs, the first electric output having a first electric characteristic and the second driver comprises components configured to provide second electric output to the second array of a plurality of first LEDs, the second electric output having a second electric characteristic. In such embodiments, the first electric characteristic is different than the second electric characteristic. For example, the first electric characteristic may be different than the second electric characteristic in terms of any one or more of power output, current amplitude, current duty cycle, a minimum current, a maximum current and a current range.

[0028] In some embodiments, the first LED filament is different in architecture from the second LED filament in that the first LED filament comprises a first number of LEDs and the second LED filament comprises a second number of LEDs. In such embodiments, the first number of LEDs is different than the second number of LEDs.

[0029] In some embodiments, the first LED filament is different in architecture from the second LED filament in that the first LED filament comprises LEDs of at least a first LED type and the second LED filament comprises LEDs of at least a second LED type. In such embodiments, the first LED type is different than the second LED type.

[0030] In some embodiments, the first LED filament is different in architecture from the second LED filament in that the first elongated encapsulant is of at least a first encapsulant type and the second elongated encapsulant is of at least a second encapsulant type. In such embodiments, the first encapsulant type is different than the second encapsulant type. For example, difference in terms of luminescent material and / or composition, difference in concentration of encapsulant or the encapsulant has a different thickness.

[0031] In some embodiments, the first LED filament is different in architecture from the second LED filament in that the first elongated carrier is of at least a first substrate type and the second elongated carrier is of at least a second substrate type. In such embodiments, the first substrate type is different than the second substrate type. Some substrates have better thermal management e.g. improved cooling i.e. a higher current may be applied to these LEDs. For example, the first LEDs may have a polymer / organic elongated carrier, while the second elongated carrier may be inorganic e.g. of a metal or a ceramic or glass or sapphire.

[0032] Some embodiments of a LED filament arrangement comprises a third LED filament configured to provide, in operation, third LED filament light. In such embodiments, the third LED filament comprises a third array of a plurality of third LEDs arranged on a first2025PF80065

[0033] 5

[0034] major surface of a third elongated carrier, and a third elongated encapsulant at least partly enclosing the plurality of third LEDs and at least partly covering the first major surface of the third elongated carrier. The third elongated encapsulant comprises at least one of a third luminescent material configured to at least partly convert third LED light emitted by the third plurality of first LEDs into third converted light and a third light-scattering material configured to at least partly scatter third LED light emitted by the third plurality of third LEDs into third scattered light.

[0035] The third LED filament in such embodiments comprises a third driver arranged on the third elongated carrier and configured to control a third current through the third plurality of third LEDs. The third driver is different in architecture from the first driver and the second driver. Also or alternatively, the third LED filament has an architecture different from the first LED filament and the second LED filament.

[0036] Some embodiments of a LED filament arrangement comprises a fourth LED filament configured to provide, in operation, fourth LED filament light. In such embodiments, the fourth LED filament comprises a fourth array of a plurality of fourth LEDs arranged on a first major surface of a fourth elongated carrier, and a fourth elongated encapsulant at least partly enclosing the plurality of fourth LEDs and at least partly covering the first major surface of the fourth elongated carrier. The fourth elongated encapsulant comprises at least one of a fourth luminescent material configured to at least partly convert fourth LED light emitted by the fourth plurality of first LEDs into fourth converted light and a fourth light-scattering material configured to at least partly scatter fourth LED light emitted by the fourth plurality of fourth LEDs into fourth scattered light.

[0037] The fourth LED filament in such embodiments comprises a fourth driver arranged on the fourth elongated carrier and configured to control a fourth current through the fourth plurality of fourth LEDs. The fourth driver is different in architecture from the first driver, the second driver and the third driver. Also or alternatively, the fourth LED filament has an architecture different from the first LED filament , the second LED filament and the third LED filament.

[0038] In some embodiments, the second LED filament comprises a fifth array of a plurality of fifth LEDs arranged on the second elongated carrier, and a fifth elongated encapsulant at least partly enclosing said plurality of fifth LEDs and at least partly covering said second elongated carrier. The fifth elongated encapsulant comprises at least one of a fifth luminescent material configured to at least partly convert fifth LED light emitted by said fifth plurality of first LEDs into fifth converted light and a fifth light-scattering material2025PF80065

[0039] 6

[0040] configured to at least partly scatter fifth LED light emitted by said fifth plurality of fifth LEDs into fifth scattered light. The second driver comprises a controller configured to individually control said plurality of second LEDs and said plurality of fifth LEDs. The second LEDs and the fifth LEDs are of different colors or of different correlated color temperatures with a difference of at least 500K.

[0041] In some embodiments, the second LED filament comprises a sixth array of a plurality of sixth LEDs arranged on the second elongated carrier, and a sixth elongated encapsulant at least partly enclosing said plurality of sixth LEDs and at least partly covering said second elongated carrier. The sixth elongated encapsulant comprises at least one of a sixth luminescent material configured to at least partly convert sixth LED light emitted by said sixth plurality of first LEDs into sixth converted light and a sixth light-scattering material configured to at least partly scatter sixth LED light emitted by said sixth plurality of sixth LEDs into sixth scattered light. The second driver comprises a controller configured to individually control said plurality of second LEDs, said plurality of fifth LEDs and said plurality of sixth LEDs. The second LED filament is a red, green and blue, RGB, LED filament and the first LED filament is a white LED filament.

[0042] In a further aspect, there is provided a luminaire comprising at least one LED filament arrangement as summarized above. Such a luminaire provides effects and advantages corresponding to those as summarized above for the embodiments of a LED filament arrangement. Moreover, further effects and advantages of such a luminaire is that only two feedthrough wires may be used in a (sealed) LED filament luminaire, while the LED filaments can be controlled individually. For luminaires a LED filament connector may be releasably connected to electrical luminaire connectors, for example based on clamping.

[0043] BRIEF DESCRIPTION OF THE DRAWINGS

[0044] 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 where:

[0045] Fig. 1 schematically illustrates a LED filament arrangement with two LED filaments,

[0046] Fig. 2 schematically illustrates a LED filament arrangement with two LED filaments,

[0047] Fig. 3 schematically illustrates a LED filament arrangement with three LED filaments,2025PF80065

[0048] 7

[0049] Fig. 4 schematically illustrates a LED filament arrangement with four LED filaments,

[0050] Fig. 5 schematically illustrates a LED filament arrangement with two LED filaments,

[0051] Fig. 6 schematically illustrates a LED filament arrangement with two LED filaments, and

[0052] Fig. 7 schematically illustrates a lamp or luminaire.

[0053] DETAILED DESCRIPTION

[0054] As illustrated in figure 1 and figure 2, embodiments of a LED filament arrangement 1 configured to, in operation, provide LED filament arrangement light, comprise a plurality of LED filaments. The plurality of LED filaments comprises at least a first LED filament 11 configured to provide, in operation, first LED filament light and a second LED filament 12 configured to provide, in operation, second LED filament light.

[0055] The LED filament arrangement light comprises one or more of the first LED filament light and the second LED filament light. The first LED filament light comprises one or more of the first converted light, the first scattered light, and part of the first LED light. The second LED filament light comprises one or more of the second converted light, the second scattered light, and part of the second LED light.

[0056] The first LED filament 11 comprises a first array (e.g. a single ID array) of a plurality of first LEDs 101 arranged on a first major surface of a first elongated carrier 111. The plurality of first LEDs 101 may be electrically connected to a first electrical track and / or wiring. The plurality of first LEDs 101 may comprises at least 10 first LEDs or at least 20 first LEDs.

[0057] A first elongated encapsulant 121 at least partly encloses the plurality of first LEDs 101 and at least partly covers the first major surface of the first elongated carrier 111. The first elongated encapsulant 121 comprises at least one of a first luminescent material configured to at least partly convert first LED light emitted by the first plurality of first LEDs 101 into first converted light and a first light-scattering material configured to at least partly scatter first LED light emitted by the first plurality of first LEDs 101 into first scattered light. The first LED light may have a first peak emission wavelength in a wavelength range from 430 nm to 490 nm and the first converted light may have a second peak emission wavelength in a wavelength range from 500 nm to 680 nm.2025PF80065

[0058] 8

[0059] The first elongated encapsulant 121 may at least partly cover a second major surface (opposite to said first major surface) of the first elongated carrier 111. The first elongated carrier 111 may be light-transmissive e.g. translucent such as transparent or light scattering. Part of the first LED light may be transmitted through the first elongated carrier 111.

[0060] The second LED filament 12 comprises a second array (e.g. a single ID array) of a plurality of second LEDs 102 arranged on a first major surface of a second elongated carrier 112. The plurality of second LEDs 102 may be electrically connected to a second electrical track and / or wiring. The plurality of second LEDs 102 may comprises at least 10 second LEDs or at least 20 second LEDs.

[0061] A second elongated encapsulant 122 at least partly enclosing the plurality of second LEDs 102 and at least partly covering the first major surface of the second elongated carrier 112. The second elongated encapsulant 122 comprises at least one of a second luminescent material configured to at least partly convert second LED light emitted by the second plurality of second LEDs 102 into second converted light and a second lightscattering material configured to at least partly scatter second LED light emitted by the second plurality of second LEDs 102 into second scattered light. The second LED light may have a third peak emission wavelength in a wavelength range from 430 nm to 490 nm and the second converted light may have a fourth peak emission wavelength in a wavelength range from 500 nm to 680 nm.

[0062] The second elongated encapsulant 122 may at least partly cover a second major surface (opposite to said first major surface) of the second elongated carrier 112. The second elongated carrier 112 may be light-transmissive e.g. translucent such as transparent or light scattering. Part of the second LED light may be transmitted through the second elongated carrier 112.

[0063] Furthermore, the first LED filament 11 comprises a first driver 131 arranged on the first elongated carrier 111 and configured to control a first current through the first plurality of first LEDs 101. The first driver 131 may be electrically connected to the first electrical track and / or wiring and it may comprise at least 3 or at least 4 or at least 5 first driver components.

[0064] The second LED filament 12 comprises a second driver 131 arranged on the second elongated carrier 112 and configured to control a second current through the second plurality of second LEDs 102. The second driver 132 may be electrically connected to the2025PF80065

[0065] 9

[0066] second electrical track and / or wiring and it may comprise at least 3 or at least 4 or at least 5 second driver components.

[0067] An LED driver (such as the first driver 131 and the second driver 132) is a device that provides power and regulates the current and / or voltage supplied to LEDs. LED drivers are essential for ensuring that LEDs operate efficiently and effectively, as LEDs require a specific voltage and current to function properly. LED drivers may be configured to individually control different (subsets) of LEDs. LED drivers can vary in complexity and features depending on the type and / or number of LEDs.

[0068] The first driver 131 is different in architecture from the second driver 132. Also or alternatively, the first LED filament 11 has an architecture different from the second LED filament 12. Figure 1 illustrates an embodiment where the first driver 131 is different in architecture from the second driver 132. Figure 2 illustrates an embodiment where the first LED filament 11 has an architecture different from the second LED filament 12. The second filament 12 illustrated in figures 1 and 2 may be mutually exchanged and thereby illustrate an embodiment where, the first driver is different in architecture from the second driver and the first LED filament has an architecture different from the second LED filament.

[0069] In some embodiments, as illustrated in figure 1, the first driver 131 is different in architecture from the second driver 132 by any one or more of: the first driver 131 comprises at least one, or at least two or at least three, driver component 1311 and / or driver component type that is of a different type than a type of any component among components 1320 of the second driver 132 and / or the second driver 132 comprises at least one, or at least two or at least three, driver component 1321 and / or driver component type that is of a different type than a type of any component among components 1310 of the first driver 131. Here, different types of components are illustrated by different shapes of the components of the drivers 131, 132.

[0070] A driver component type may be 1. Input rectifier and filter, 2. Power factor correction (PFC) circuit, 3. DC / DC converter, 4. Output control circuit, 5. Protection circuitry, 6. Feedback circuit.

[0071] In some more detail, an input rectifier and filter is a component that converts AC voltage from the power source to DC voltage. A PFC circuit helps to improve the power factor of the LED driver. A DC / DC converter regulates the voltage and current to ensure consistent power supply to the LEDs. An output control circuit controls the brightness and dimming of the LEDs. Protection circuitry includes over-voltage protection, over-current protection, and thermal protection to ensure the safety and longevity of the LED driver and2025PF80065

[0072] 10

[0073] LEDs. A feedback circuit monitors and adjusts the output voltage and current to maintain stability and efficiency.

[0074] A driver component may be a semiconductor, a capacitor, a resistor and / or magnetics (inductor or transformer).

[0075] In some embodiments, as illustrated in figure 2, the first driver 131 is different in architecture from the second driver 132 in that the first driver 131 comprises components 1310 arranged spatially on the first carrier 111 according to a first topology and the second driver 132 comprises components 1320 arranged spatially on the second carrier 112 according to a second topology. In such embodiments, the first topology is different than the second topology. As for figure 1, different types of components are here illustrated by different shapes of the components of the drivers 131, 132. The difference in topology between the components 1310 in the first driver 131 and the components 1320 in the second driver 132 is exemplified by their different locations in the first driver 131 and second driver 132, respectively. Differences in topology may include differences in sequence, connection, location and / or position.

[0076] In some embodiments, the first driver 131 is different in architecture from the second driver 132 in that the first driver 131 comprises components 1310 configured to provide first electric output, e.g. a current and / or voltage, to the first array of a plurality of first LEDs 101, the first electric output having a first electric characteristic, e.g. a minimum current, a maximum current and / or a current range, and the second driver 132 comprises components 1320 configured to provide second electric output, e.g. a current and / or voltage, to the second array of a plurality of first LEDs 102, the second electric output having a second electric characteristic, e.g. a minimum current, a maximum current and / or a current range. In such embodiments, the first electric characteristic is different than the second electric characteristic. For example, the first electric characteristic may be different than the second electric characteristic in terms of any one or more of power output, current amplitude and current duty cycle. For example, a difference in minimum current, a difference in a maximum current and / or a difference in a current range (size). Differences may be at least 10% or at least 30% or at least 50% such as 100% e.g. the maximum current for the second LEDs 102 may be two times the maximum current supplied to the first LEDs 101.

[0077] In some embodiments, the first LED filament 11 is different in architecture from the second LED filament 12 in that the first LED filament 11 comprises a first number of LEDs 101 and the second LED filament 12 comprises a second number of LEDs 102. In such embodiments, the first number of LEDs 101 is different than the second number of2025PF80065

[0078] 11

[0079] LEDs 102. For example, the difference in the number of LEDs may be at least 10% or at least 30% or at least 50%. Such embodiments are illustrated by the example in figure 2 where the first LED filament 11 is configured with six LEDs 101 and the second LED filament 12 is configured with four LEDs 102.

[0080] In some embodiments, the first LED filament 11 is different in architecture from the second LED filament 12 in that the first LED filament 11 comprises LEDs 101 of at least a first LED type and the second LED filament 12 comprises LEDs 102 of at least a second LED type. In such embodiments, the first LED type is different than the second LED type. Different LED type may mean different semiconductor material(s), different semiconductor layers (e.g. emitting different peak emission wavelengths or colors e.g. differences of at least 30nm), different semiconductor layer area (i.e. one has a lager die). For example, referring to figure 1 or figure 2, the LEDs 101 arranged on the first LED filament 11 may, in relation to the LEDs 102 arranged on the second LED filament 12, produce light having different wavelengths, have different epitaxial areas, be made of different semiconductor materials and / or being stacked differently.

[0081] In some embodiments, the first LED filament 11 is different in architecture from the second LED filament 12 in that the first elongated encapsulant 121 is of at least a first encapsulant type and the second elongated encapsulant 122 is of at least a second encapsulant type. In such embodiments, the first encapsulant type is different than the second encapsulant type. For example, difference in terms of luminescent material and / or composition, difference in concentration of encapsulant or the encapsulant has a different thickness.

[0082] Referring to figure 1 or figure 2, the first encapsulant 121 arranged on the first LED filament 11 may, in relation to the second encapsulant 122 arranged on the second LED filament 12, comprise different luminescent materials to provide different spectral power distributions of the respective converted light emitted by the LED filaments 11, 12.

[0083] In some embodiments, the first LED filament 11 is different in architecture from the second LED filament 12 in that the first elongated carrier 111 is of at least a first substrate type and the second elongated carrier 112 is of at least a second substrate type. In such embodiments, the first substrate type is different than the second substrate type. For example, referring to figure 1 or figure 2, the first carrier 111 of the first LED filament 11 may, in relation to the second carrier 112 of the second LED filament 12, be made of different materials and / or have different spatial dimensions. For example, the first LEDs may2025PF80065

[0084] 12

[0085] have a polymer / organic elongated carrier, while the second elongated carrier may be inorganic e.g. of a metal or a ceramic or glass or sapphire.

[0086] As illustrated in figure 3, a LED filament arrangement 1 may comprise a third LED filament 13 configured to provide, in operation, third LED filament light. In such embodiments, the third LED filament 13 comprises a third array of a plurality of third LEDs 103 arranged on a first major surface of a third elongated carrier 113, and a third elongated encapsulant 123 at least partly enclosing the plurality of third LEDs 103 and at least partly covering the first major surface of the third elongated carrier 113. The third elongated encapsulant 123 comprises at least one of a third luminescent material configured to at least partly convert third LED light emitted by the third plurality of first LEDs 103 into third converted light and a third light-scattering material configured to at least partly scatter third LED light emitted by the third plurality of third LEDs 103 into third scattered light.

[0087] The third LED filament 13 in such embodiments comprises a third driver 133 arranged on the third elongated carrier 113 and configured to control a third current through the third plurality of third LEDs 103. The third driver 133 is different in architecture from the first driver 131 and the second driver 132. Also or alternatively, the third LED filament 13 has an architecture different from the first LED filament 11 and the second LED filament 12.

[0088] Similar to the embodiments described above in connection with figure 1 and figure 2, in embodiments involving the third LED filament 13, the third driver 133 may differ in architecture from the first driver 131 and the second driver 132 in terms of types of components, topology of the components and / or electric output of the driver. Furthermore, similar to the embodiments described above in connection with figure 1 and figure 2, in embodiments involving the third LED filament 13, the third LED filament 13 may differ in architecture from the first LED filament 11 and the second LED filament 12 in terms of different number of LEDs, different types of LEDs, different encapsulant types and / or different types of carrier substrates.

[0089] As illustrated in figure 4, a LED filament arrangement 1 may comprise a fourth LED filament 14 configured to provide, in operation, fourth LED filament light. In such embodiments, the fourth LED filament 14 comprises a fourth array of a plurality of fourth LEDs 104 arranged on first major surface of a fourth elongated carrier 114, and a fourth elongated encapsulant 124 at least partly enclosing the plurality of fourth LEDs 104 and at least partly covering the first major surface of the fourth elongated carrier 114. The fourth elongated encapsulant 124 comprises at least one of a fourth luminescent material configured to at least partly convert fourth LED light emitted by the fourth plurality of first2025PF80065

[0090] 13

[0091] LEDs 104 into fourth converted light and a fourth light-scattering material configured to at least partly scatter fourth LED light emitted by the fourth plurality of fourth LEDs 104 into fourth scattered light.

[0092] The fourth LED filament 14 in such embodiments comprises a fourth driver 134 arranged on the fourth elongated carrier 114 and configured to control a fourth current through the fourth plurality of fourth LEDs 104. The fourth driver 134 is different in architecture from the first driver 131, the second driver 132 and the third driver 133. Also or alternatively, the fourth LED filament 14 has an architecture different from the first LED filament 11, the second LED filament 12 and the third LED filament 13.

[0093] Similar to the embodiments described above in connection with figure 1, figure 2 and figure 3, in embodiments involving the fourth LED filament 14, the fourth driver 134 may differ in architecture from the first driver 131, the second driver 132 and the third driver 133 in terms of types of components, topology of the components and / or electric output of the driver. Furthermore, similar to the embodiments described above in connection with figure 1, figure 2 and figure 3, in embodiments involving the fourth LED filament 14, the fourth LED filament 14 may differ in architecture from the first LED filament 11, the second LED filament 12 and the third LED filament 13 in terms of different number of LEDs, different types of LEDs, different encapsulant types and / or different types of carrier substrates.

[0094] As illustrated in figure 5, the second LED filament 12 may comprise a fifth array of a plurality of fifth LEDs 105 arranged on the second elongated carrier 112, and a fifth elongated encapsulant 125 at least partly enclosing said plurality of fifth LEDs 105 and at least partly covering said second elongated carrier 112. The fifth elongated encapsulant 125 comprises at least one of a fifth luminescent material configured to at least partly convert fifth LED light emitted by said fifth plurality of first LEDs 105 into fifth converted light and a fifth light-scattering material configured to at least partly scatter fifth LED light emitted by said fifth plurality of fifth LEDs 105 into fifth scattered light. The second driver 132 comprises a controller configured to individually control said plurality of second LEDs 102 and said plurality of fifth LEDs 105. The second LEDs 102 and the fifth LEDs 105 are of different colors or of different correlated color temperatures with a difference of at least 500K.

[0095] As illustrated in figure 6, the second LED filament 12 may comprise a sixth array of a plurality of sixth LEDs 106 arranged on the second elongated carrier 112, and a sixth elongated encapsulant 126 at least partly enclosing said plurality of sixth LEDs 106 and2025PF80065

[0096] 14

[0097] at least partly covering said second elongated carrier 112. The sixth elongated encapsulant 126 comprises at least one of a sixth luminescent material configured to at least partly convert sixth LED light emitted by said sixth plurality of first LEDs 106 into sixth converted light and a sixth light-scattering material configured to at least partly scatter sixth LED light emitted by said sixth plurality of sixth LEDs 106 into sixth scattered light. The second driver 132 comprises a controller configured to individually control said plurality of second LEDs 102, said plurality of fifth LEDs 105 and said plurality of sixth LEDs 106. The second LED filament 12 is a red, green and blue, RGB, LED filament and the first LED filament 11 is a white LED filament.

[0098] Figure 7 illustrates a lamp or luminaire 70 comprising at least one LED filament arrangement 1 as described above. The lamp or luminaire 70 in figure 7 comprises a LED filament arrangement 1 comprising three LED filaments, such as an embodiment described above in connection with figure 3. In such embodiments, the three LED filaments 11, 12, 13 may be configured as a respective cold white (CW), warm white (WW) and extra warm white (EWW) LED filament. In other embodiments, the three LED filaments 11, 12, 13 may be configured as a respective red (R), green (G) and blue (B) LED filament. In embodiments of the luminaire 70 having four LED filaments, the LED filaments may be configured as a respective red (R), green (G), blue (B) and white (W) LED filament.

Claims

2025PF8006515CLAIMS:

1. A light emitting diode, LED, filament arrangement (1) configured to, in operation, provide LED filament arrangement light, the LED filament arrangement comprising a plurality of LED filaments, said plurality of LED filaments comprising at least a first LED filament (11) configured to provide, in operation, first LED filament light and a second LED filament (12) configured to provide, in operation, second LED filament light, wherein:said first LED filament (11) comprises a first array of a plurality of first LEDs (101) arranged on a first major surface of a first elongated carrier (111), and a first elongated encapsulant (121) at least partly enclosing said plurality of first LEDs (101) and at least partly covering said first major surface of said first elongated carrier (111),said first elongated encapsulant (121) comprises at least one of a first luminescent material configured to at least partly convert first LED light emitted by said first plurality of first LEDs (101) into first converted light and a first light-scattering material configured to at least partly scatter first LED light emitted by said first plurality of first LEDs (101) into first scattered light,said second LED filament (12) comprises a second array of a plurality of second LEDs (102) arranged on a first major surface of a second elongated carrier (112), and a second elongated encapsulant (122) at least partly enclosing said plurality of second LEDs (102) and at least partly covering said first major surface of said second elongated carrier (112),said second elongated encapsulant (122) comprises at least one of a second luminescent material configured to at least partly convert second LED light emitted by said second plurality of second LEDs (102) into second converted light and a second lightscattering material configured to at least partly scatter second LED light emitted by said second plurality of second LEDs (102) into second scattered light,said first LED filament (11) comprises a first driver (131) arranged on said first elongated carrier (111) and configured to control a first current through said first plurality of first LEDs (101),said second LED filament (12) comprises a second driver (132) arranged on2025PF8006516said second elongated carrier (112) and configured to control a second current through said second plurality of second LEDs (102), and wherein:said first driver (131) is different in architecture from said second driver (132) and said first LED filament (11) has an architecture different from said second LED filament (12), and wherein by any one or more of:said first driver (131) comprises at least one driver component and / or driver component type (1311) that is of a different type than a type of any component among components (1320) of said second driver (132) and / orsaid second driver (132) comprises at least one driver component and / or driver component type (1321) that is of a different type than a type of any component among components (1310) of said first driver (131).

2. The LED filament arrangement (1) according to any one of the preceding claims, wherein said first driver (131) is different in architecture from said second driver (132) in that:said first driver (131) comprises components (1310) arranged spatially on the first carrier (111) according to a first topology,said second driver (132) comprises components (1320) arranged spatially on the second carrier (112) according to a second topology, andsaid first topology is different than said second topology.

3. The LED filament arrangement (1) according to any one of the preceding claims, wherein said first driver (131) is different in architecture from said second driver (132) in that:said first driver (131) comprises components (1310) configured to provide first electric output to the first array of a plurality of first LEDs (101), said first electric output having a first electric characteristic,said second driver (132) comprises components (1320) configured to provide second electric output to the second array of a plurality of first LEDs (102), said second electric output having a second electric characteristic, andsaid first electric characteristic is different than said second electric characteristic.2025PF80065174. The LED filament arrangement (1) according to claim 3, wherein said first electric characteristic is different than said second electric characteristic in terms of any one or more of:power output,current amplitude,current duty cycle,a minimum current,a maximum current, anda current range.

5. The LED filament arrangement (1) according to any one of the preceding claims, wherein said first LED filament (11) is different in architecture from said second LED filament (12) in that:said first LED filament (11) comprises a first number of LEDs (101), said second LED filament (12) comprises a second number of LEDs (102), andsaid first number of LEDs (101) is different than said second number of LEDs (102).

6. The LED filament arrangement (1) according to any one of the preceding claims, wherein said first LED filament (11) is different in architecture from said second LED filament (12) in that:said first LED filament (11) comprises LEDs (101) of at least a first LED type, said second LED filament (12) comprises LEDs (102) of at least a second LED type, andsaid first LED type is different than said second LED type.

7. The LED filament arrangement (1) according to any one of the preceding claims, wherein said first LED filament (11) is different in architecture from said second LED filament (12) in that:said first elongated encapsulant (121) is of at least a first encapsulant type, said second elongated encapsulant (122) is of at least a second encapsulant type, andsaid first encapsulant type is different than said second encapsulant type.2025PF80065188. The LED filament arrangement (1) according to any one of the preceding claims, wherein said first LED filament (11) is different in architecture from said second LED filament (12) in that:said first elongated carrier (111) is of at least a first substrate type, said second elongated carrier (112) is of at least a second substrate type, and said first substrate type is different than said second substrate type.

9. The LED filament arrangement (1) according to any one of the preceding claims comprising a third LED filament (13) configured to provide, in operation, third LED filament light, wherein:said third LED filament (13) comprises a third array of a plurality of third LEDs (103) arranged on a first major surface of a third elongated carrier (113), and a third elongated encapsulant (123) at least partly enclosing said plurality of third LEDs (103) and at least partly covering said first major surface of said third elongated carrier (113),said third elongated encapsulant (123) comprises at least one of a third luminescent material configured to at least partly convert third LED light emitted by said third plurality of first LEDs (103) into third converted light and a third light-scattering material configured to at least partly scatter third LED light emitted by said third plurality of third LEDs (103) into third scattered light,said third LED filament (13) comprises a third driver (133) arranged on said third elongated carrier (113) and configured to control a third current through said third plurality of third LEDs (103), and wherein:(i) said third driver (133) is different in architecture from said first driver (131) and said second driver (132) and / or (ii) said third LED filament (13) has an architecture different from said first LED filament (11) and said second LED filament (12).

10. The LED filament arrangement (1) according to claim 9 comprising a fourth LED filament (13) configured to provide, in operation, fourth LED filament light, wherein:said fourth LED filament (14) comprises a fourth array of a plurality of fourth LEDs (104) arranged on a first major surface of a fourth elongated carrier (114), and a fourth elongated encapsulant (124) at least partly enclosing said plurality of fourth LEDs (104) and at least partly covering said first major surface of said fourth elongated carrier (114),said fourth elongated encapsulant (124) comprises at least one of a fourth2025PF8006519luminescent material configured to at least partly convert fourth LED light emitted by said fourth plurality of first LEDs (104) into fourth converted light and a fourth light-scattering material configured to at least partly scatter fourth LED light emitted by said fourth plurality of fourth LEDs (104) into fourth scattered light,said fourth LED filament (14) comprises a fourth driver (144) arranged on said fourth elongated carrier (114) and configured to control a fourth current through said fourth plurality of fourth LEDs (104), and wherein:(i) said fourth driver (134) is different in architecture from said first driver (131), said second driver (132) and said third driver (133) and / or (ii) said fourth LED filament (13) has an architecture different from said first LED filament (11), said second LED filament (12) and said third LED filament (13).

11. The LED filament arrangement (1) according to any one of claims 1 to 10, wherein the second LED filament (12) comprises a fifth array of a plurality of fifth LEDs (105) arranged on the second elongated carrier (112), and a fifth elongated encapsulant (125) at least partly enclosing said plurality of fifth LEDs (105) and at least partly covering said second elongated carrier (112),said fifth elongated encapsulant (125) comprises at least one of a fifth luminescent material configured to at least partly convert fifth LED light emitted by said fifth plurality of first LEDs (105) into fifth converted light and a fifth light-scattering material configured to at least partly scatter fifth LED light emitted by said fifth plurality of fifth LEDs (105) into fifth scattered light, wherein:said second driver (132) comprises a controller configured to individually control said plurality of second LEDs (102) and said plurality of fifth LEDs (105), and said second LEDs (102) and said fifth LEDs (105) are of different colors or of different correlated color temperatures with a difference of at least 500K.

12. The LED filament arrangement (1) according to claim 11, wherein said second LED filament (12) comprises a sixth array of a plurality of sixth LEDs (106) arranged on the second elongated carrier (112), and a sixth elongated encapsulant (126) at least partly enclosing said plurality of sixth LEDs (106) and at least partly covering said second elongated carrier (112),said sixth elongated encapsulant (126) comprises at least one of a sixth luminescent material configured to at least partly convert sixth LED light emitted by said2025PF8006520sixth plurality of first LEDs (106) into sixth converted light and a sixth light-scattering material configured to at least partly scatter sixth LED light emitted by said sixth plurality of sixth LEDs (106) into sixth scattered light, wherein:said second driver (132) comprises a controller configured to individually control said plurality of second LEDs (102), said plurality of fifth LEDs (105) and said plurality of sixth LEDs (106), and whereinsaid second LED filament (12) is a red, green and blue, RGB, LED filament and the first LED filament (11) is a white LED filamentA13. A lamp or a luminaire (70) comprising at least one LED filament arrangement (1) according to any one of claims 1 to 12.

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