LED Filament Interconnect Ring

Abstract

The present invention provides a light-generating device 100 comprising: (i) n filaments 200; (ii) a power distribution unit 400; and (iii) an electronics 500, wherein: (a) each of the n filaments 200 comprises one or more solid-state light sources 10, n≧1, each of the n filaments 200 comprises at least m electrical contacts 221, m≧2, and the n filaments 200 are configured to generate filament light 201; (b) the power distribution unit 400 comprises k conductive tracks 410 separated by an electrically insulating material 420, k≧2; (c) at least two of the electrical contacts 221 of the n filaments 200 are operatively coupled to at least two different conductive tracks 410; (d) the at least two different conductive tracks 410 are operatively coupled to the electronics 500; and (e) the electronics 500 comprises one or more of a control system, a driver, and a transformer.

Description

[Technical field]

[0001] The present invention relates to a light-generating device as well as to a retrofit lamp comprising such a light-generating device. [Background technology]

[0002] LED filament lamps are known in the art. For example, US Patent Application Publication No. 2018 / 0328543 describes a lamp comprising a light-transmitting enclosure for emitting emitted light, a base connected to the enclosure, at least one first LED filament and at least one second LED filament in the enclosure operable to emit light when energized via an electrical path from the base, the at least one first LED filament emitting light having a first correlated color temperature (CCT) and the at least one second LED filament emitting light having a second CCT, the at least one first LED filament and at least one second LED filament combined to generate the emitted light, and a controller that changes the CCT of the emitted light when the lamp is dimmed. The light-transmitting enclosure is transparent.

[0003] Incandescent lamps are being rapidly replaced by LED-based lighting solutions. Nevertheless, it may be appreciated and desired by users to have a retrofit lamp with the appearance of an incandescent bulb. For this purpose, the infrastructure for manufacturing glass-based incandescent lamps may be utilized to replace the filament with an LED that emits white light. One of the concepts is based on an LED filament that is placed in such a bulb. The appearance of these lamps is highly valued due to their decorative appearance. Summary of the Invention [Problem to be solved by the invention]

[0004] Multi-channel LED filaments require the connection of multiple signals coming from a driver. The signals from the driver are typically transmitted via wires that run through the stem of the filament lamp. Connecting these wires directly to the filament contacts can be problematic, especially when more than one filament is used in the bulb.

[0005] It is therefore an aspect of the present invention to provide an alternative light-generating device, which preferably also at least partially obviates one or more of the above-mentioned disadvantages. The present invention may have as an object to overcome or ameliorate at least one of the disadvantages of the prior art, or to provide a useful alternative. [Means for solving the problem]

[0006] In particular, the invention provides in embodiments interconnect rings capable of distributing power and / or distributing signals, but also units of other shapes, which may further make it possible to connect the filaments in any useful and suitable manner.

[0007] In a first aspect, the present invention provides a light-generating device comprising (i) n filaments and (ii) a power distribution unit. Furthermore, the light-generating device may comprise (iii) electronics. In particular, in an embodiment, each of the n filaments comprises one or more solid-state light sources. Furthermore, in a particular embodiment, n≧1. In an embodiment, each of the n filaments comprises at least m electrical contacts. Furthermore, in a particular embodiment, m≧2. In particular, the n filaments are configured to generate filament light. Furthermore, in an embodiment, the power distribution unit may comprise k conductive tracks separated by an electrically insulating material. Furthermore, in a particular embodiment, k≧2. Furthermore, in a particular embodiment, at least two of the electrical contacts of the n filaments may be operatively coupled to at least two different conductive tracks (of the power distribution unit). In yet further particular embodiments, the at least two different conductive tracks may be operatively coupled to the electronics. In particular, in an embodiment, the electronics may comprise one or more of a control system, a driver, and a transformer. Therefore, in particular, the present invention provides, in an embodiment, a light-generating device comprising: (i) n filaments; (ii) a power distribution unit; and (iii) electronics, wherein: (a) each of the n filaments comprises one or more solid-state light sources, n≧1, each of the n filaments comprises at least m electrical contacts, m≧2, and the n filaments are configured to generate filament light; (b) the power distribution unit comprises k conductive tracks separated by an electrically insulating material, k≧2; (c) at least two of the electrical contacts of the n filaments are operatively coupled to at least two different conductive tracks; (d) the at least two different conductive tracks are operatively coupled to the electronics; and (e) the electronics comprises one or more of a control system, a driver, and a transformer.

[0008] The present invention may reduce or prevent problems associated with directly soldering electrical wires into the glass stem, for example for mechanical support and electrical insulation. The present invention may also provide more space for making electrical connections and may also provide support for the filament. The present invention may also allow an easier way to provide power and / or signals to multiple filaments, for example to control multiple filaments individually or sets of filaments individually, for example to control the color point and correlated color temperature (of the device light). Signal distribution may be easier than prior art solutions. Thus, among other things, the present invention may provide a useful solution for multi-channel LED filament lamps. Furthermore, the present invention may provide a solution for providing an alternative location for the RF antenna. Furthermore, the filament may also help to spread heat from the filament and therefore aid in cooling.

[0009] As mentioned above, the present invention provides, in an embodiment, a light-generating device comprising: (i) n filaments; and (ii) a power distribution unit.

[0010] As mentioned above, each of the n filaments includes one or more solid-state light sources. Each filament may include a support and a solid-state light source supported by the support. In particular, in an embodiment, each filament includes a plurality of solid-state light sources, but this specification does not exclude that an elongated solid-state light source may be applied. In particular, the filament may include a (light-transmitting) encapsulant that may at least partially surround the solid-state light source, in particular at least surround the light-emitting surface of the solid-state light source, such as a die.

[0011] The LED filament includes a support, a set of solid-state light sources ("light sources"), and an encapsulant. The LED filament may have a length axis having a first length (L1). In particular, the solid-state light sources are disposed on the support over the first length (L1) of the LED filament. Furthermore, the solid-state light sources are configured to generate source light (during operation of the light-generating device). In particular, in an embodiment, the encapsulant surrounds at least a portion of each of the solid-state light sources of the set of solid-state light sources. In general, the filament may have an aspect ratio of length to width and an aspect ratio of length to height of at least 10, for example selected from the range of 10 to 10,000. The aspect ratios of different filaments may be different in certain embodiments, but in embodiments, the aspect ratios may be essentially the same. It is noted that the aspect ratios of length to width and length to height of the filaments may be different.

[0012] Further, in embodiments, the encapsulant may include a luminescent material configured to convert at least a portion of the source light into luminescent material light. Alternatively or additionally, one or more of the one or more solid state light sources may include a luminescent material, and the encapsulant may be transparent or translucent in embodiments.

[0013] Further alternatively or additionally, the solid state light source may be configured to generate solid state light source light without having a conversion material included by the solid state light source, i.e., the solid state light source light may have essentially the same spectral power distribution as that exiting the die, and even in such embodiments, the (optional) encapsulant may be transparent or translucent in embodiments.

[0014] Therefore, each of the n filaments may include one or more solid-state light sources, in particular a plurality of light sources, and each of the n filaments is configured to generate filament light (during the corresponding filament's operating mode). The filament light may include one or more of luminescent material light and solid-state light source light (for solid-state light sources without luminescent material). The luminescent material light may be from a PC solid-state light source, i.e., a phosphor converter solid-state light source, or from a luminescent material in an encapsulant. A solid-state light source without luminescent material may also be referred to herein as a non-PC solid-state light source or a direct color LED.

[0015] The filaments are not necessarily the same. For example, there may be two or more filaments with different numbers of solid-state light sources. Alternatively or additionally, there may be two or more filaments with different shapes. Alternatively or additionally, there may be two or more filaments configured to generate filament light with different spectral power distributions. Alternatively or additionally, there may be two or more filaments with different spectral power distribution adjustability.

[0016] Furthermore, there may be a set of filaments, the set including two or more filaments that may be essentially identical in number of solid-state light sources, filament light spectral power distribution, etc., and the filaments within a set are (and therefore) not essentially different from each other (in terms of filament light spectral power distribution), while filaments from different sets may be different from each other (particularly in filament light spectral power distribution).

[0017] The LED filament of a filament lamp can typically provide warm white light, i.e. light with a very low color temperature. The color temperature is typically below 2700K, for example 2500K or 2300K. Some LED filament lamps provide light with a very low color temperature, for example 2200K or 2000K. Low color temperature sources will appear yellowish or reddish, and this has been evaluated. Even lower CCTs may be possible (see also below). However, higher CCTs may also be possible (see also below).

[0018] As mentioned above, the light-generating device may comprise an LED filament, which comprises a support, a set of solid-state light sources, and an encapsulant. The number of light sources in the set may be at least 4, such as at least 8, even more particularly at least 12, for example up to 100, or even more. In particular, in an embodiment, the number of light sources in the set may be selected from the range of 10 to 1000, for example 10 to 200.

[0019] The term "light source" may refer to a semiconductor light emitting device, such as a light emitting diode (LED), a resonant cavity light emitting diode (RCLED), a vertical cavity laser diode (VCSEL), an edge emitting laser, etc. The term "light source" may also refer to an organic light emitting diode, such as a passive-matrix organic light-emitting diode (PMOLED) or an active-matrix organic light-emitting diode (AMOLED). In a particular embodiment, the light source comprises a solid-state light source (such as an LED or a laser diode). In one embodiment, the light source comprises an LED (light emitting diode). The term LED may also refer to a plurality of LEDs. Furthermore, the term "light source" may also refer to a so-called chips-on-board (COB) light source in an embodiment. The term "COB" refers in particular to an LED chip in the form of a semiconductor chip, which is mounted directly on a substrate, such as a PCB, without encapsulation or connection. Thus, a plurality of semiconductor light sources may be configured on the same substrate. In an embodiment, the COB is a multi-LED chip, configured together as a single lighting module. The term "light source" may also refer to multiple (essentially identical (or different)) light sources, such as 2-2000 solid-state light sources. In an embodiment, the light source may include one or more micro-optical elements (array of microlenses) downstream of a single solid-state light source, such as an LED, or downstream of multiple solid-state light sources (i.e., shared by multiple LEDs, for example). In an embodiment, the light source may include an LED with on-chip optics. In an embodiment, the light source includes a pixelated single LED (with or without optics) (which in an embodiment provides on-chip beam steering).

[0020] The terms "upstream" and "downstream" refer to the location of an article or feature relative to the propagation of light from a light generating means (here specifically a light source), where relative to a first location in the light beam from the light generating means, a second location in the light beam that is closer to the light generating means is "upstream" and a third location in the light beam that is farther away from the light generating means is "downstream".

[0021] The term "parallel" may refer to substantially parallel or within + / - 10 degrees, more preferably within + / - 5 degrees, from the axis of elongation.

[0022] The term conductive tracks may refer to tracks that are electrically conductive and may be separated by electrically insulating material. Examples of conductive tracks may be, for example, conductive wires (comprising copper and / or silver) or conductive patterns, for example made by lithography and / or (screen) printing type techniques. For example, copper conductive tracks may be used.

[0023] The phrases "different light sources" or "multiple different light sources" and similar phrases may, in embodiments, refer to multiple solid-state light sources selected from at least two different bins. Similarly, the phrases "same light source" or "multiple identical light sources" and similar phrases may, in embodiments, refer to multiple solid-state light sources selected from the same bin.

[0024] Herein, in an embodiment, the solid-state light sources in the set are particularly essentially the same. Therefore, the solid-state light sources in the set may be, for example, from the same bin. Therefore, in a particular embodiment, the solid-state light sources in the set may be configured to generate source light having essentially the same color point and / or essentially the same dominant wavelength. In yet another embodiment, the solid-state light source includes a limited number of different light sources, for example, up to about five, for example, up to about four different types of solid-state light sources, more particularly, up to about three different types of different solid-state light sources. Therefore, in a particular embodiment, the solid-state light sources may be configured to generate source light having different color points and / or dominant wavelengths.

[0025] In certain embodiments, the color or color point of the first type of light and the second type of light may differ if the respective color points of the first type of light and the second type of light differ by at least 0.01 with respect to u' and / or at least 0.01 with respect to v', even more particularly at least 0.02 with respect to u' and / or at least 0.02 with respect to v'. In even more particular embodiments, the respective color points of the first type of light and the second type of light may differ by at least 0.03 with respect to u' and / or at least 0.03 with respect to v'. In other particular embodiments, the first type of light and the second type of light may be essentially the same in color or color point if the respective color points of the first type of light and the second type of light differ by at most 0.03 with respect to u' and / or at least 0.03 with respect to v', even more particularly at most 0.02 with respect to u' and / or at least 0.02 with respect to v'. In even more particular embodiments, the respective color points of the first type of light and the second type of light may differ by up to 0.01 with respect to u' and / or at least 0.01 with respect to v', where u' and v' are the color coordinates of the lights on the CIE 1976 UCS (uniform chromaticity scale) diagram.

[0026] As mentioned above, in an embodiment, n≧1. However, in particular, n≧2. In many of the embodiments discussed herein, 2≦n≦8, for example 2≦n≦6. However, larger values ​​for n, for example up to 12 in an embodiment, are not excluded here. For a single power distribution unit, values ​​of n greater than about 6 are usually not possible. However, the use of, for example, two to three power distribution units is also not excluded here. The light-generating device comprises at least one power distribution unit.

[0027] In particular, each of the n filaments includes at least m electrical contacts, m≧2. In particular, in an embodiment, m=2, but m may also be greater. Each filament may include an anode and a cathode. In particular, each filament has a cathode at one end of the filament and an anode at the other end of the filament. However, m may also be greater than 2 for a single filament. In an embodiment, m may be 3 or 4 for a single filament. For example, assuming a filament with two types of LEDs with different CCTs, or assuming a filament with three colors such as RGB, there may be a common anode or cathode and two or three contacts for signals (high or low CCT, or R, G, and B, respectively). For example, assuming a five-channel filament with RGB-WW-CW (WW and CW denote warm white and cool white, respectively), there may be six electrical contacts. Thus, in embodiments, a filament may include a single cathode and multiple anodes, or a single anode and multiple cathodes.

[0028] Thus, in an embodiment, the number of electrical contacts may be the number of channels plus one. Thus, in an RGB-WW-CW 5 channel embodiment, the number of contacts may be 6. Furthermore, the number of channels may also dictate the number of conductive tracks. In particular, in an embodiment, the number of conductive tracks is at least equal to the number of channels.

[0029] As mentioned above, in particular embodiments, each filament may include multiple solid-state light sources. In certain embodiments, at least two of the multiple solid-state light sources of each filament are configured in series. It may also be possible that there are two or three arrays, or even more arrays, each of multiple solid-state light sources in series. In such embodiments, the filament may include three or more electrical contacts, depending, for example, on whether it may be desirable to control the series solid-state light sources, for example, individually. For example, assuming kl1 series solid-state light sources, where kl1≧1, a maximum of kl1 * There may be kl1+1 contacts, i.e., 2. In cases where there is a shared electrode (or "common electrode"), such as a common anode or a common cathode, the number of contacts may be, for example, kl1+1. As mentioned above, if there is only one series, kl1=1, and there may be, for example, two contacts. See also further below.

[0030] Such LED filaments are known and described, for example, in U.S. Pat. No. 8,400,051 (B2), WO2020016058, WO2019197394, which are incorporated herein by reference.

[0031] In embodiments, one or more filaments, particularly all filaments, may have a substantially straight shape. In yet other embodiments, one or more filaments, particularly all filaments, may have a curved shape. In yet other embodiments, one or more filaments, particularly all filaments, may have a spiral shape. In yet other embodiments, one or more filaments, particularly all filaments, may have a helical shape. If two or more filaments have a spiral or helical shape, in embodiments, two of them may have similarly configured windings. Other shapes of filaments may also be possible, such as having distinctive shapes, such as letters, numbers, flowers, leaves, or other shapes.

[0032] In particular, the present invention provides a power distribution unit, which may also be referred to as a "power and signal distribution unit". In an embodiment, the power distribution unit includes k conductive tracks (the "tracks") separated by an electrical insulating material. The power distribution unit may be regarded as a kind of multi-track system, and the contact of the filament is allocated to one (generally only one) of the tracks. In particular, the power distribution unit may include at least two tracks. Therefore, in an embodiment, k≥2. Specific embodiments of the power distribution unit are further described below.

[0033] In some embodiments, the number of k tracks may be equal to the number of filaments. Therefore, each filament may be functionally coupled to a track. In still other embodiments, a set of two or more filaments is functionally coupled to a track. In such embodiments, k < n. However, as further described below, embodiments in which the conductive trap may also be used as an antenna are also described herein. In a specific embodiment, k may be at least the number of individually controlled series solid-state light sources. Therefore, in an embodiment, at least two of the electrical contacts of the n filaments may be functionally coupled to at least two different conductive tracks. In particular, one of the electrical contacts of each filament is functionally coupled to one of the conductive tracks.

[0034] Furthermore, in an embodiment, the light-generating device may further comprise electronics. In an embodiment, the electronics includes one or more of a control system, a driver, and a transformer. The electronics may therefore provide power and / or signals to the corresponding filament or set of filaments. The power distribution unit may have a kind of intermediate function, the power distribution unit being functionally coupled to the electronics and the filament. Or, in other words, the electronics may be functionally coupled to the filament via the power distribution unit. Thus, in particular, at least two different conductive tracks may be functionally coupled to the electronics. The electronics may be included by or supported by the PCB.

[0035] The functional connection may be provided by methods known in the art, such as for example soldering or welding. Optionally, (other) connectors may be applied, such as for example based on friction or crimping.

[0036] The power distribution unit may be (physically) configured between the filament and the electronics. For example, at least a portion of the electronics may be operatively coupled to a printed circuit board (PCB). The power distribution unit may be configured at a distance of at least about 1 mm, such as at least about 2 mm, from the PCB. In an embodiment, the power distribution unit may be configured parallel to the PCB. The PCB may, in an embodiment, have, for example, a circular shape.

[0037] In a particular embodiment, the power distribution unit may have a ring shape. In particular, the ring shape may be a closed ring shape, such as a circle, a rectangle, a hexagon, an octagon, or any other type of polygon with nine or more sides. In other embodiments, the power distribution unit may have a non-closed ring shape, such as a kind of C-shape, or any of the aforementioned shapes that are not completely closed. In particular, in an embodiment, the power distribution unit has a ring shape that is closed by at least 270°, for example in an embodiment 360° (a complete ring shape). Since the invention provides in an embodiment a ring-shaped power distribution unit, the invention provides in a particular embodiment a kind of interconnected ring. When the ring is closed, in a particular embodiment where a first support structure is applied, the ring may circumferentially surround the first support structure.

[0038] As mentioned above, this specification does not exclude that the light-generating device comprises two or more power distribution units. In such an embodiment, a first power distribution unit may be physically configured between a second power distribution unit and the electronic device. When two or more power distribution units are applied, different power distribution units may have, for example, different inner and outer diameters. However, it is noted that the present invention is not limited to a ring-shaped power distribution unit.

[0039] In an embodiment, the power distribution unit may include one or more, in particular two or more, conductive tracks. In particular, the conductive tracks may be arranged parallel to one another. The power distribution unit may have a length or circumference that is greater than the length of the corresponding track. However, in other embodiments, the length of the corresponding track may be in the range of 70-100% of the length or circumference of the power distribution unit. If each of the corresponding tracks has a length in the range of 70-100% of the length or circumference of the power distribution unit, this may further allow an easier way of supplying power and / or signals to multiple filaments to control multiple filaments individually or to control sets of filaments individually.

[0040] The power distribution unit may have a (maximum) height of about 0.5-20 mm, such as 1-10 mm, e.g. 1-5 mm. Further, the power distribution unit may have a (maximum) thickness of about 0.1-15 mm, such as 0.2-10 mm. Still further, the power distribution unit may have a (minimum) inner diameter and a (maximum) outer diameter, each of about 2-80 mm, the outer diameter being larger than the inner diameter (approximately in terms of the thickness).

[0041] For example, in an embodiment, the power distribution unit may have a triangular cross-sectional shape and have conductive tracks at the edges separated by an electrically insulating material. This allows for example to provide three different conductive tracks. For example, in an embodiment, the power distribution unit may have a rectangular cross-sectional shape and have conductive tracks at the edges separated by an electrically insulating material. This allows for example to provide four different conductive tracks. For example, in another embodiment, the power distribution unit may have a hexagonal cross-sectional shape and have conductive tracks at the edges separated by an electrically insulating material. This allows for example to provide six different conductive tracks. However, other shapes may also be possible.

[0042] In an embodiment, the electrical insulating material comprises a polymeric material. Alternatively or additionally, the electrical insulating material comprises one or more of a glass material, a composite material, and a ceramic material. Other non-metallic materials may also be applied as the electrical insulating material. For example, the electrical insulating material may be selected from the group consisting of PET, PE, PC, PP, Al2O3, and glass, although in an embodiment, other materials, such as flex foil, may also be applied.

[0043] For example, in an embodiment, the power distribution unit may be provided by 2K molding of a conductive material and an electrically insulating material. In yet another embodiment, the power distribution unit may be provided by overmolding using a conductive insert and an electrically insulating (base) material. In yet another embodiment, the power distribution unit may be provided by printing conductive tracks on a glass body or on a ceramic body. In yet another embodiment, the power distribution unit may be provided by depositing conductive tracks on a support, such as a polymer body, a glass body, or a ceramic body. In particular, the electrically insulating material may be configured as a support for the conductive tracks. The conductive tracks include a conductive material. The conductive material may include, for example, one or more of copper and silver, in particular copper.

[0044] The conductive elements, such as the conductive tracks and / or the electrical contacts, may comprise or consist essentially of a conductive material. The electrically insulating elements may comprise or consist essentially of an electrically insulating material. In the present specification, in an embodiment, the conductive material is particularly preferably a material having a dielectric constant of at least 1·10 5 S / m, e.g. at least 1·10 6 In this specification, the electrical conductivity of the insulating material may be in particular 1·10 -10 S / m or less, especially 1·10 -13 In this specification, the ratio of the electrical conductivity of an insulating material (insulator) to the electrical conductivity of a conductive material (conductor) may be, in particular, 1·10 -15 Conductive contact may refer to a (physical) contact between two (or more) conductive elements, such as two conductive layers. In such an embodiment, the conductivity of an arrangement of two conductive elements, measured across the two conductive elements, may be selected to be at least 1·10 6Conductive contact exists when the electrical conductivity of the arrangement of two (or more) conductive elements with a medium between them, as measured across the two conductive elements with a medium between them, is at least 1·10 6 In certain embodiments, the resistivity of the dielectric layer is at least about 1 MOhm. * It may be cm.

[0045] In particular, in embodiments, the insulating material may be either reflective or light transmissive.

[0046] The filament lamp may also comprise a support for the filament. Such a support may have the shape or look like a glass stem, as in classical light bulbs. Relative to the length of the light-generating device, such a support may in an embodiment be arranged parallel to the length of the light-generating device. The power distribution unit mentioned above may, for example, in an embodiment be arranged perpendicular to such a support.

[0047] This support structure is denoted herein as "first support structure". Thus, in an embodiment, the light-generating device may further comprise a first support structure. In particular, the first support structure may be configured to support n filaments. For example, at one end, the filament may be operatively coupled to the first support structure. As mentioned above, the power distribution unit may also be configured to support the filament in an embodiment. Thus, in a particular embodiment, one or more of the power distribution unit and the first support structure are configured to support n filaments. Even more particularly, in an embodiment, both the power distribution unit and the first support structure may be configured to support n filaments. For example, at one end, the filament may be operatively coupled to the first support structure and at the other end, the filament may be operatively coupled to the power distribution unit. Here, the term "support" may refer, for example, to holding in place.

[0048] In certain embodiments, the first support structure may include a hollow glass body. In yet other embodiments, the first support structure may include a hollow ceramic body. In yet other embodiments, the first support structure may include a hollow quartz body. In yet other embodiments, the first support structure may include a hollow polymer body. The first support structure may include a block body in yet other embodiments. Materials other than glass, ceramic, quartz, and polymer may also be used. In particular, in embodiments, the first support structure is transmissive to light, such as transparent to (filament) light.

[0049] In particular, the first support structure may itself be electrically insulating, although the first support structure may in embodiments support one or more conductive tracks.

[0050] In particular, in an embodiment, the first support structure may have a length equal to or greater than the (effective length of) the filament.

[0051] The light-generating device may generally comprise a light-transmitting envelope ("bulb"), e.g. a light-transparent envelope, e.g. a glass envelope in an embodiment. The envelope may at least partially, and even more particularly substantially, surround one or more filaments. The light-transmitting envelope may have an envelope height (e.g. as defined by standard shapes B35, A60, ST63, G90, etc.). The first support structure may have a length of at least 20%, e.g. in an embodiment up to about 80%, of the height of the light-transmitting envelope. In particular, the envelope is transparent to (visible) light.

[0052] In certain embodiments, the power distribution unit at least partially circumferentially surrounds the first support structure. As noted above, the power distribution unit referred to above may, for example, in embodiments be configured perpendicular to such support.

[0053] In an embodiment, the PCB may also be operatively coupled to the first support structure.

[0054] The first support structure may also be configured to house or support electrical conductors, for example an electrical circuit may be provided running from the PCB, through the power distribution unit, to the filament, and back to the PCB via electrical conductors housed or supported by the first support structure.

[0055] The electrical conductors may include one or more of electrical wires and conductive tracks. For example, in embodiments, the electrical conductors may include leadthroughs that may be housed by the first support element.

[0056] As used herein, the term "containing" may particularly refer to a hollow first support element through which, for example, one or more electrical conductors may be configured.

[0057] As can be derived from the above, in an embodiment, n≧2. Furthermore, in particular the electrical contacts comprise a first electrical contact and a second electrical contact, the first electrical contact of the filament being (in an embodiment) operatively coupled to different conductive tracks and the second electrical contact of the filament being operatively coupled to an electronic device. The latter functional coupling may be provided in a different manner.

[0058] In an embodiment, functional coupling of the second electrical contact of the filament with the electronics may be provided via a number of electrical conductors (see also above) housed or supported by the first support structure.

[0059] Alternatively, the second electrical contact of the filament may be operatively coupled to the same conductive track, but a different conductive track to which the first electrical contact is operatively coupled. In this way, there may be a shared electrode to which the second electrical contact can be operatively coupled.

[0060] Alternatively, such a shared electrode may be housed or supported by the first support element. Thus, in certain embodiments, the second electrical contact of the filament may be operatively coupled to a shared electrode external to the power distribution unit, such as an electrical conductor housed or supported by the first support element.

[0061] Therefore, in an embodiment, particularly where n≧2, the electrical contacts include a first electrical contact and a second electrical contact, the first electrical contact of the filament being operatively coupled to a different conductive track and the second electrical contact of the filament being operatively coupled to (a) the same conductive track, but a different conductive track than the different conductive track to which the first electrical contact is operatively coupled, or (b) a shared electrode external to the power distribution unit. In particular, in an embodiment, the shared electrode may be operatively coupled to the electronics via a conductive connection in the first support structure. The term “conductive connection” may refer to an electrical conductor, such as an electrical wire or a conductive track.

[0062] In particular, in an embodiment, there are at least two conductive tracks and at least two filaments, with at least two of the filaments each functionally coupled to a different conductive track. Furthermore, the at least two filaments may be functionally coupled to the electronics via one or more conductive connections housed or supported by the first support structure. In this way, at least two of the filaments may be individually controlled. This may allow, for example, color tuning or correlated color temperature tuning (see also below). Thus, in an embodiment, k≧2 and n≧2, and the electronics may in particular be configured to individually control at least two sets, each of at least one filament.

[0063] Moreover, as mentioned above, each of the filaments in particular may include multiple solid state light sources.

[0064] In certain embodiments, at least two of the conductive tracks are configured as anodes. Such an embodiment may, for example, be combined with a shared cathode for the filaments. As mentioned above, the shared cathode may, for example, be housed or supported by the first support element.

[0065] If there are at least two filaments functionally connected to the power distribution unit, they may be functionally connected to different conductive tracks. The conductive tracks may in particular have different positions relative to the device axis of the light-generating device. This may mean that the at least two filaments may have (slightly) different angles relative to the device axis of the light-generating device. Thus, in an embodiment, the light-generating device has a first extension axis (or length axis or device axis), the n filaments each have a second extension axis (or length axis), and the at least two second extension axes (A2) have a different second angle β relative to the first extension axis (A1).

[0066] When there are at least two filaments operatively connected to the power distribution unit, they may divide the space evenly. For example, when there are two filaments, they may be arranged opposite each other with respect to the device axis. For example, when there are three filaments, they may be arranged in a triangular pattern with equal mutual angles, etc.

[0067] Thus, in certain embodiments, the extension axes of each filament may be arranged in a plane that intersects with the device axis, the planes having a first mutual angle α selected from the range of 15 to 180°. For example, for n filaments, the first mutual angle may be 360° / n in embodiments. However, the filaments are not necessarily evenly distributed.

[0068] Thus, in a particular embodiment, the n filaments may include a first filament and a second filament, the first filament being mechanically and electrically connected to a first of the at least two different conductive tracks and the second filament being mechanically and electrically connected to a second of the at least two different conductive tracks, the extension axes of the respective filaments being arranged in a plane intersecting the device axis, the planes having a first mutual angle α selected from the range of 15 to 180°, the light-generating device having a first extension axis (A1), the n filaments each individually having a second extension axis (A2), and the at least two second extension axes (A2) having different second angles β with respect to the first extension axis (A1).

[0069] In particular embodiments, 3≦k≦6 and n≧3. In yet further particular embodiments, 3≦k≦6 and 3≦n≦6, and n=k. However, in other embodiments, 3≦k≦6 and n=2. * k or 3 * It is k.

[0070] When multiple (sets of) light sources are present, in embodiments it may be possible to control the spectral power distribution of the device light, which may (in operation) consist essentially of one or more of the n filament lights.

[0071] As mentioned above, the filament may include two or more arrays of light sources, which may be individually controlled. Alternatively or additionally, two or more filaments may be alternatively controlled.

[0072] Thus, in embodiments, one or more of the color point and correlated color temperature of the device light may be controllable in embodiments, particularly where the device light consists essentially of a filament light.

[0073] For example, the device light may have a controllable color point, where two or more color points (in different operational modes) have a color point difference of at least 0.03 with respect to u' and / or at least 0.03 with respect to v'. Alternatively or additionally, the device light may have a controllable color point, where two or more spectral power distributions (in different operational modes) have different centroid wavelengths that differ from each other by at least 10 nm. In certain embodiments, at least two spectral power distributions of the device light (in at least two corresponding operational modes) may have centroid wavelengths that differ by at least 10 nm, such as at least 20 nm, or even at least 30 nm, such as a difference selected from the range of 30 to 200 nm.

[0074] The term "centroid wavelength", also referred to as λc, is known in the art and refers to the wavelength value at which half the light energy is at shorter wavelengths and half the energy is at longer wavelengths, the value being written in units of nanometers (nm). The centroid wavelength is calculated according to the formula λc=Σλ *is the wavelength that divides the integral of the spectral power distribution, as represented by I(λ) / (ΣI(λ), into two equal parts, where the summation is over the wavelength range of interest and I(λ) is the spectral energy density (i.e., the integral of the wavelength-intensity product over the emission band, normalized to the integrated intensity). The centroid wavelength may be determined, for example, at operating conditions.

[0075] The term "controlling" and similar terms in particular refer to at least determining the behavior of an element or managing the operation of an element. Thus, in this specification, "controlling" and similar terms may refer to, for example, imposing a behavior on an element, such as, for example, measuring, indicating, activating, opening, transitioning, changing temperature, etc. (determining the behavior of an element or managing the operation of an element). Alternatively, the term "controlling" and similar terms may further include monitoring. Thus, the term "controlling" and similar terms may include imposing a behavior on an element, as well as imposing a behavior on an element and monitoring the element. Controlling an element can be performed by a control system, which may also be denoted as a "controller". Thus, the control system and the element may be functionally coupled, at least temporarily or permanently. The element may include the control system. In an embodiment, the control system and the element may not be physically coupled. Control can be performed via wired control and / or wireless control. The term "control system" may also refer to multiple different control systems that are specifically functionally coupled, of which, for example, one control system may be a master control system and one or more other control systems may be slave control systems. A control system may include a user interface or be functionally coupled to a user interface.

[0076] The control system may also be configured to receive and execute instructions from a remote controller. In an embodiment, the control system may be controlled via an app on a device, such as a portable device, such as a smartphone or I-phone, tablet, etc. Hence, the device is not necessarily coupled to the lighting system, but may be (temporarily) functionally coupled to the lighting system.

[0077] Therefore, in an embodiment, the control system may (also) be configured to be controlled by an app on a remote device. In such an embodiment, the control system of the lighting system may be a slave control system or may control in a slave mode. For example, the lighting system may be identifiable by a code, in particular a unique code for the corresponding lighting system. The control system of the lighting system may be configured to be controlled by an external control system that has access to the lighting system based on knowledge of the (unique) code (entered by a user interface of an optical sensor (e.g. a QR code reader)). The lighting system may also comprise means for communicating with other systems or devices, such as based on Bluetooth, WIFI, LiFi, ZigBee, BLE or WiMax, or another wireless technology.

[0078] A system, or an apparatus, or a device may perform an action in a "mode" or "operation mode" or "mode of operation". Similarly, in a method, an action, or a stage, or a step may be performed in a "mode" or "operation mode" or "mode of operation" or "operational mode". The term "mode" may also be indicated as a "control mode". This does not exclude that the system, or an apparatus, or a device may also be adapted to provide another control mode or multiple other control modes. Similarly, this may not exclude that one or more other modes may be performed before performing a mode and / or after performing a mode.

[0079] However, in embodiments, a control system may be available that is adapted to provide at least the control mode. If other modes are available, the selection of such modes may in particular be performed via a user interface, although other options may also be possible, such as executing the mode depending on a sensor signal or a (time) scheme. An operating mode may also refer in embodiments to a system, or an apparatus, or a device that can only operate in a single operating mode (i.e., "on", without further adjustability).

[0080] Thus, in an embodiment, the control system may be responsive to one or more of a user interface input signal, a sensor signal (of a sensor), and a timer, where the term "timer" may refer to a clock and / or a predefined time scheme.

[0081] In particular, in an embodiment, at least two sets of solid-state light sources may be configured to generate (solid-state light source) light having different spectral power distributions. For example, in an embodiment, at least two sets may be configured to provide (solid-state light source) light having (i) different correlated color temperatures with a difference of at least 500K, or (ii) different colors with a color point difference of at least 0.03 for u' and / or at least 0.03 for v'. In particular, the electronics may be configured to control the at least two sets of solid-state light sources in response to one or more of a user interface input signal, a sensor signal, and a timer, for example, in an embodiment. For example, two or more sets may be configured to generate (solid-state light source) light having different colors selected from purple, cyan, blue, green, yellow, orange, red, or optionally other colors.

[0082] However, in certain embodiments, at least two of the n filaments may be configured to generate filament lights having different spectral power distributions. For example, in embodiments, at least two of the n filaments may be configured to generate filament lights having (i) different correlated color temperatures with a difference of at least 500K, or (ii) different colors with a color point difference of at least 0.03 for u' and / or at least 0.03 for v'. In particular, the electronics may be configured to control at least two of the n filaments in response to one or more of a user interface input signal, a sensor signal, and a timer, for example, in embodiments. For example, two or more filaments may be configured to generate filament lights having different colors selected from purple, cyan, blue, green, yellow, orange, red, or optionally other colors.

[0083] In an embodiment, the at least two different types of light are spectral power distributions of white light, but may have at least two spectral power distributions with correlated color temperatures differing, for example, by at least 500K.

[0084] In particular, in an embodiment, one of the types of light has a spectral power distribution with a correlated color temperature selected from the range of 1800-2700 K, for example selected in the range of 1900-2400 K. However, other ranges may also be possible, such as for example in the range of 1800-6500 K. In particular, if the CCT value of the device light is variable, the maximum difference in CCT is at least 500 K.

[0085] The term "white light" in this specification is known to those skilled in the art. White light particularly relates to light having a correlated color temperature (CCT) in the range of about 1800-20000K, such as 2000-20000K, particularly 2700-20000K, particularly about 2700K-6500K for general lighting. In embodiments, for backlighting purposes, the correlated color temperature (CCT) may particularly be in the range of about 7000K-20000K. Furthermore, in embodiments, the correlated color temperature (CCT) is particularly within about 15 SDCM (standard deviation of color matching) from the black body locus (BBL), particularly within about 10 SDCM from the BBL, even more particularly within about 5 SDCM from the BBL.

[0086] The terms "visible", "visible light", or "visible emission", and similar terms refer to light having one or more wavelengths in the range of about 380 to 780 nm. As used herein, UV may specifically refer to wavelengths selected from the range of 200 to 380 nm.

[0087] The terms "light" and "radiation" are used interchangeably herein, unless it is clear from the context that the term "light" refers only to visible light. Thus, the terms "light" and "radiation" may refer to UV radiation, visible light, and IR radiation. In certain embodiments, particularly those relating to lighting applications, the terms "light" and "radiation" refer to (at least) visible light.

[0088] The term "purple light" or "purple emission" particularly relates to light having a wavelength in the range of about 380-440 nm. The term "blue light" or "blue emission" particularly relates to light having a wavelength in the range of about 440-490 nm (including some purple and cyan hues). The term "green light" or "green emission" particularly relates to light having a wavelength in the range of about 490-560 nm. The term "yellow light" or "yellow emission" particularly relates to light having a wavelength in the range of about 560-590 nm. The term "orange light" or "orange emission" particularly relates to light having a wavelength in the range of about 590-620. The term "red light" or "red emission" particularly relates to light having a wavelength in the range of about 620-750 nm. The term "cyan" may refer to one or more wavelengths selected from the range of about 490-520 nm. The term "amber" may refer to one or more wavelengths selected from the range of about 585-605 nm, such as about 590-600 nm.

[0089] As mentioned above, one (or more) of the conductive tracks may be configured as an antenna. Such a conductive track may not be functionally coupled to one of the filaments, but may be functionally coupled to an electronic device, in particular a WiFi-based wireless device, a Zigbee-based device, or a Bluetooth-based device. In particular, an antenna may be available if there are also at least two available tracks that are functionally coupled to one or more filaments. Thus, in a particular embodiment, k≧3 and at least one of the conductive tracks is configured as an antenna.

[0090] In certain embodiments, two tracks may be configured as a cathode and an anode, respectively, for the same filament. Thus, in embodiments where k is at least 2, such as k=2, one of the conductive tracks may be configured as an anode and one of the conductive tracks may be configured as a cathode.

[0091] In yet a further aspect, the present invention also provides a light-generating device as defined herein, the light-generating device being a retrofit lamp. In yet a further aspect, the present invention also provides a lamp or luminaire comprising a light-generating device as defined herein. The luminaire may further comprise a housing, optical elements, louvers, etc. The lamp or luminaire may further comprise a housing enclosing the light-generating device. The lamp or luminaire may comprise an optical window in the housing, or a housing opening, through which the system light may exit the housing.

[0092] In one embodiment, the power distribution unit does not include a (solid state) light source.

[0093] In one embodiment, the n filaments are n LED filaments.

[0094] In one embodiment, in cross-sectional view, the power distribution unit comprises k conductive tracks separated by electrically insulating material, where k > 2, or k > 2, or even k > 4. Preferably, the k conductive tracks may be located at different portions of the power distribution unit and / or may be evenly distributed around the circumference of the power distribution unit. [Brief description of the drawings]

[0095] Embodiments of the present invention will now be described, by way of example only, with reference to the accompanying schematic drawings in which corresponding reference symbols indicate corresponding parts, and in which: [Figure 1a] 1 illustrates a schematic diagram of an embodiment and some aspects. [Figure 1b] 1 illustrates a schematic diagram of an embodiment and some aspects. [Figure 2a] 1 illustrates several embodiments in a schematic manner. [Figure 2b] 1 illustrates several embodiments in a schematic manner. [Figure 2c] 1 illustrates several embodiments in a schematic manner. [Figure 2d]1 illustrates several embodiments in a schematic manner. [Figure 2e] 1 illustrates several embodiments in a schematic manner. [Figure 2f] 1 illustrates several embodiments in a schematic manner. [Figure 3a] Several embodiments and variants are illustrated diagrammatically. [Figure 3b] Several embodiments and variants are illustrated diagrammatically. [Figure 3c] Several embodiments and variants are illustrated diagrammatically. [Figure 3d] Several embodiments and variants are illustrated diagrammatically. [Figure 3e] Several embodiments and variants are illustrated diagrammatically. [Figure 4] Also, one embodiment is shown.

[0096] The schematic drawings are not necessarily to scale. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0097] FIG. 1a shows a schematic representation of an embodiment of a light-generating device 100 comprising n filaments 200, a power distribution unit 400 and an electronics 500. FIG. 1a shows a schematic cross-sectional shape. Each of the n filaments 200 comprises one or more solid-state light sources 10. In particular, n≧1. Here, n=2. Each of the n filaments 200 comprises at least m electrical contacts 221. In particular, m≧2. Here, m=2. The n filaments 200 are configured to generate (in operation) a filament light 201.

[0098] The power distribution unit 400 comprises k conductive tracks 410 (see inter alia Fig. 1b) separated by an electrically insulating material 420. For the embodiment of Fig. 1a, for example, k > 2. For the sake of understanding, the different conductive tracks 410 are indicated with the reference signs 411 and 412, respectively.

[0099] At least two of the electrical contacts 221 of the n filaments 200 may be operatively coupled to at least two different conductive tracks. The at least two different conductive tracks may be operatively coupled to the electronic device 500.

[0100] In particular, the electronics 500 may include one or more of a control system, a driver, and a transformer.

[0101] Reference 600 refers to a light-transmitting envelope. Reference 170 denotes a screw-on cap or an Edison (screw-on) cap. In an embodiment, the power distribution unit 400 has a ring shape. Reference H denotes the height of the light-transmitting envelope 600.

[0102] The light-generating device 100 may further comprise a first support structure 120. One or more of the power distribution unit 400 and the first support structure 120 may be configured to support the n filaments 200. The power distribution unit 400 at least partially circumferentially surrounds the first support structure 120. In an embodiment, the first support structure 120 may comprise a hollow glass body. Reference sign H1 denotes the height of the first support structure 120.

[0103] As noted above, in an embodiment, n > 2. In an embodiment, k > 2 and n > 2.

[0104] In an embodiment, the electrical contacts 221 include a first electrical contact 2211 and a second electrical contact 2212. The first electrical contact 2211 of the filament 200 may be operatively coupled to a different conductive track. The second electrical contact 2212 of the filament 200 may be operatively coupled (i) to the same conductive track, but a different conductive track than the different conductive track 410 to which the first electrical contact 2211 is operatively coupled, or (ii) to a shared electrode 132 external to the power distribution unit 400.

[0105] In an embodiment, each filament 200 may include multiple solid state light sources 10.

[0106] The shared electrode 132 may be operatively coupled to the electronic device 500 via a conductive connection in the support structure.

[0107] In an embodiment, the electronics 500 may be configured to individually control at least two sets, each set of at least one filament 200. In particular, each of the filaments 200 includes multiple solid-state light sources 10.

[0108] The light-generating device 100 has a first extension axis A1 and the n filaments 200 each have a second extension axis A2, at least two of the second extension axes A2 having different second angles β with respect to the first extension axis A1. The respective second angles β for each filament 200 are indicated with the references β1 and β2. It should be noted that the angles may differ slightly in the embodiment shown diagrammatically.

[0109] FIG. 1b shows a schematic cross-section of a possible power distribution unit 400. An embodiment I shows two conductive tracks 410 and an electrically insulating material 420. An embodiment II shows three conductive tracks 410 and an electrically insulating material 420. An embodiment III shows four conductive tracks 410 and an electrically insulating material 420. However, other embodiments may also be possible. The different conductive tracks 410 are indicated with references 411, 412, 413, 414, respectively. In an embodiment, the electrically insulating material 420 may comprise a polymer material. In an embodiment, the electrically insulating material 420 comprises one or more of a glass material, a composite material, and a ceramic material. In particular, in an embodiment, at least two of the conductive tracks 410 are configured as anodes. In an embodiment, at least one of the conductive tracks 410 is configured as an antenna. In particular, this may apply in embodiments where k≧3.

[0110] 1a, 1b (and also some embodiments shown, for example, in FIGS. 2a-2f), the n filaments 200 may include a first filament 210 and a second filament 220. The first filament 210 is mechanically and electrically connected to a first conductive track 411 of the at least two different conductive tracks 410. The second filament 220 is mechanically and electrically connected to a second conductive track 412 of the at least two different conductive tracks 410.

[0111] In an embodiment, at least two of the n filaments 200 are configured to generate filament lights 201 having different spectral power distributions.

[0112] In an embodiment, at least two of the n filaments 200 are configured to generate filament light 201 having (i) different correlated color temperatures with a difference of at least 500 K, or (ii) different colors with a color point difference of at least 0.03 with respect to u' and / or at least 0.03 with respect to v'.

[0113] In an embodiment, the electronics 500 may be configured to control at least two of the n filaments 200 in response to one or more of a user interface input signal, a sensor signal, and a timer.

[0114] In certain embodiments, 3≦k≦6 and n≧3. Furthermore, in certain embodiments, k=2 and one of the conductive tracks 410 is configured as an anode and one of the conductive tracks 410 is configured as a cathode.

[0115] 2a, n=6 and k=2. Note that there are two sets of three filaments 200 each. The filaments have a shared electrode on one side that may be connected to electronics (not shown) via the first support structure 120.

[0116] 2b shows a schematic representation of an embodiment of a helical shaped filament 200. This filament 200 comprises two series solid-state light sources. In this embodiment, the power distribution unit 400 may therefore have two conductive tracks 410.

[0117] 2c shows a schematic representation of an embodiment of two filaments 200 in double helix form, each of which contains a single in-line solid-state light source. Therefore, also in this embodiment, the power distribution unit 400 may have two conductive tracks 410.

[0118] 2d shows a schematic representation of an embodiment of two sets of two (curved) filaments 200 each. These filaments 200 each comprise a single in-line solid-state light source. Therefore, also in this embodiment, the power distribution unit 400 may have two conductive tracks 410. The filaments 200 in a set are operatively coupled to the same conductive track 410.

[0119] 2e shows a schematic representation of an embodiment of a helical shaped filament 200. This filament 200 comprises three solid-state light sources in series. Therefore, in this embodiment, the power distribution unit 400 may have three conductive tracks 410.

[0120] 2f shows a schematic representation of an embodiment of four (curved) filaments 200, each of which comprises a single in-line solid-state light source. In this embodiment, the power distribution unit 400 may therefore have four conductive tracks 410.

[0121] Figures 3a to 3f show several embodiments in a schematic manner.

[0122] 3a is a cross-sectional view that shows diagrammatically that the angle β of the filament 200 relative to the device axis A1 may be slightly different, where the values ​​for the two angles β may therefore be different.

[0123] Referring to Figure 3b, an embodiment is shown in which the elongation axis A2 of each filament 200 is configured in a plane that intersects with the device axis A1. The planes have a first mutual angle α selected from the range of 15 to 180°. Figure 3b is a top view of one embodiment.

[0124] Fig. 3c shows two schematic embodiments with three (embodiment I) or two (embodiment II) series of solid-state light sources 10, each with a single filament. In the embodiments, these series may be controlled individually. In embodiment I, kl1 = 3, in embodiment II, kl1 = 2.

[0125] FIG. 3d shows a schematic diagram of an embodiment of an LED filament 200. The LED filament 200 includes a support 105, a set 107 of solid-state light sources 10, and an encapsulant 60. The LED filament 200 has a length axis 108 having a first length L1. The solid-state light sources 10 are disposed on the support 105 over the first length L1 of the LED filament 200. The solid-state light sources 10 are configured to generate a source light 11. In an embodiment, the solid-state light sources 10 may be configured to generate a blue source light 11. The encapsulant 60 surrounds at least a portion of each of the solid-state light sources 10 of the set 107 of solid-state light sources 10. The encapsulant 60 includes a luminescent material 210 configured to convert at least a portion of the source light 11 into a luminescent material light 211. In an embodiment, the luminescent material 210 may be configured to convert at least a portion of the source light 11 into luminescent material light 211 having one or more wavelengths of (i) green and / or red, and (ii) yellow and optionally red, in particular in combination with the blue source light 11. Thus, the luminescent material may be configured to generate yellow and / or red light by converting at least a portion of the blue light. The luminescent material may also be configured to generate green and / or red light by converting at least a portion of the blue light. As mentioned above, the term "luminescent material" may also refer to a number of different luminescent materials. In particular, the luminescent material may include a garnet luminescent material as mentioned above. Reference number 15 refers to a light-emitting surface of the solid-state light source 10, such as an LED die. The solid-state light source 10 may be available on a substrate or support 105. Furthermore, the solid-state light source 10 (and the substrate 105) may be embedded in a light-transmitting material, in particular a resin. A light-transmitting material surrounding the light source is indicated with reference numeral 145. In particular, the light-transmitting material may include, e.g., embedded therein, a luminescent material 210. In particular, the light-transmitting material 145 may be a resin that receives a luminescent material 210, such as an inorganic luminescent material, in an organic resin. The resin may be, for example, an acrylic or silicone resin, or an epoxy resin.The combination of optically transparent material 145 and luminescent material is referred to herein as encapsulant 60 .

[0126] This embodiment is shown diagrammatically in a cross-sectional view of the drawing plane, which also includes the length axis 108 .

[0127] For curved filaments, the length L1 may be greater than the effective length, which may be defined, for example, as the length between two opposite ends of the filament.

[0128] Figure 3e shows a schematic perspective view of the same embodiment as shown diagrammatically in figure 3d.

[0129] FIG. 3f shows a schematic perspective view of a curved filament. It should be noted here that the length axis 108 is also curved. The length axis may be the body axis of the support 105. The length of this axis is determined along the axis 108. If the filament 200 may be curved in the plane of the filament 200, the imaginary plane may also be curved, essentially the same as the curvature of the filament 210. In other words, if the support is curved in the plane of the support, the length axis will also be curved, and similarly the first and second imaginary planes may also be curved. The length axis in the embodiment of FIG. 3f starts from a first surface on the left side, follows the curved body axis, and ends on a second surface on the right side.

[0130] FIG. 4 shows a schematic representation of an embodiment of a retrofit lamp (which is or comprises a light-generating device 100).

[0131] The term "plurality" refers to two or more.

[0132] The terms "substantially" or "essentially" and similar terms herein will be understood by those skilled in the art. The terms "substantially" or "essentially" may also include embodiments with "entirely", "completely", "all", etc. Thus, in embodiments, the adjectives substantially or essentially may also be omitted. Where applicable, the terms "substantially" or "essentially" may also relate to 90% or more, including 100%, such as 95% or more, particularly 99% or more, and even more particularly 99.5% or more.

[0133] The term "comprises" also includes embodiments where the term "comprises" means "consists of."

[0134] The term "and / or" specifically refers to one or more of the items mentioned before and after "and / or." For example, the phrase "item 1 and / or item 2" and similar phrases may refer to one or more of items 1 and 2. The term "comprising" may, in one embodiment, refer to "consisting of," but in another embodiment may also refer to "including at least the defined species, and optionally one or more other species."

[0135] Moreover, the terms first, second, third, etc., in the specification and claims are used to distinguish between similar elements and are not necessarily used to describe a sequential or chronological order, and the terms so used are interchangeable under appropriate circumstances, with it being understood that the embodiments of the invention described herein are capable of operation in other orders than those described or illustrated herein.

[0136] As used herein, a device, apparatus, or system may be described, among other things, in operation. As will be apparent to one of ordinary skill in the art, the present invention is not limited to methods of operation or to devices, apparatus, or systems in operation.

[0137] It should be noted that the above-described embodiments are illustrative rather than limiting of the invention, and that those skilled in the art will be able to design many alternative embodiments without departing from the scope of the appended claims.

[0138] In the claims, any reference signs placed between parentheses shall not be construed as limiting the claim.

[0139] Use of the verb "to comprise" and its conjugations does not exclude the presence of elements or steps other than those stated in a claim. Unless the context clearly requires otherwise, throughout the specification and claims, the words "comprise", "comprising", and the like, are to be interpreted in an inclusive sense, i.e., "including, but not limited to", rather than an exclusive or exhaustive sense.

[0140] The article "a" or "an" preceding an element does not exclude the presence of a plurality of such elements.

[0141] The invention may be implemented by means of hardware comprising several distinct elements, and by means of a suitably programmed computer. In a device, apparatus or system claim enumerating several means, several of these means may be embodied by one and the same item of hardware. The mere fact that certain means are recited in mutually different dependent claims does not indicate that a combination of these means cannot be used to advantage.

[0142] The present invention also provides a control system that may control a device, apparatus or system or that may perform the methods or processes described herein. Still further, the present invention also provides a computer program product operatively coupled to or contained by a device, apparatus or system, which when executed on a computer controls one or more controllable elements of such a device, apparatus or system.

[0143] The invention further applies to a device, an apparatus or a system comprising one or more of the features described in the present specification and / or shown in the accompanying drawings.The invention further relates to a method or process comprising one or more of the features described in the present specification and / or shown in the accompanying drawings.

[0144] The various aspects discussed in this patent may be combined to provide additional advantages. Moreover, those skilled in the art will appreciate that embodiments may be combined, and that three or more embodiments may be combined. Moreover, some of the features may form the basis for one or more divisional applications.

Claims

1. A light-generating device comprising n filaments, a power distribution unit and electronics, each of the n filaments includes one or more solid-state light sources, n≧1; each of the n filaments includes at least m electrical contacts, m≧2; and the n filaments are configured to generate a filament light; the power distribution unit includes k conductive tracks separated by electrically insulating material, k≧2; at least two of the electrical contacts of the n filaments are operatively coupled to at least two different conductive tracks; the at least two different conductive tracks are operatively coupled to the electronics; the electronics including one or more of a control system, a driver, and a transformer; k≧2 and n≧2, and the electronics are configured to independently control at least two sets of at least one filament each, each of the filaments including a plurality of solid-state light sources; One or more of a color point and a correlated color temperature of a device light is controllable, and the device light includes, in operation, one or more of the filament lights among the n filaments; the conductive tracks are arranged parallel to one another, The power distribution unit has a ring shape.

2. The light generating device of claim 1 , wherein the electrically insulating material comprises a polymeric material.

3. 3. The light-generating device of claim 1 or 2, wherein the electrically insulating material comprises one or more of a glass material, a composite material, and a ceramic material.

4. 3. The light generating device of claim 1 or 2, further comprising a first support structure, wherein one or more of the power distribution unit and the first support structure are configured to support the n filaments.

5. 5. The light-generating device of claim 4, wherein the power distribution unit at least partially circumferentially surrounds the first support structure.

6. 3. The light-generating device of claim 1, wherein n>2, the electrical contacts comprise a first electrical contact and a second electrical contact, the first electrical contact of the filament being operatively coupled to a different conductive track and the second electrical contact of the filament being operatively coupled to a same conductive track but different from the different conductive track to which the first electrical contact is operatively coupled, or to a shared electrode external to the power distribution unit, and each filament comprises a plurality of solid-state light sources.

7. 7. The light generating device of claim 6, wherein the shared electrode is operatively coupled to the electronics via a conductive connection in the support structure of claim 6.

8. 3. A light generating device according to claim 1 or 2, wherein the length of the corresponding track is in the range of 70-100% of the length or circumference of the power distribution unit.

9. 3. A light-generating device according to claim 1 or 2, wherein at least two of the conductive tracks are configured as anodes.

10. 9. The light-generating device of claim 8, wherein the n filaments include a first filament and a second filament, the first filament being mechanically and electrically connected to a first one of the at least two different conductive tracks and the second filament being mechanically and electrically connected to a second one of the at least two different conductive tracks, the extension axes of each of the filaments being arranged in a plane that intersects a device axis, the planes having a first mutual angle selected from the range of 15 to 180 degrees, the light-generating device having a first extension axis, the n filaments each individually having a second extension axis, and at least two second extension axes having different second angles with respect to the first extension axis.

11. 9. The light-generating device of claim 8, wherein 3≦k≦6 and n≧3.

12. 10. The light generating device of claim 8, wherein at least two of the n filaments are configured to generate filament light having different correlated color temperatures with a difference of at least 500K or different colors with a color point difference of at least 0.03 for u′ and / or at least 0.03 for v′, and wherein the electronics are configured to control the at least two of the n filaments in response to one or more of a user interface input signal, a sensor signal, and a timer.

13. 3. A light-generating device according to claim 1 or 2, wherein k≧3 and at least one of the conductive tracks is configured as an antenna.

14. 3. The light-generating device of claim 1 or 2, wherein the light-generating device is a retrofit lamp.

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