LED filament configuration with individually controlled LEDs

Abstract

The LED filament configuration 100 includes a first LED filament 110 including a first array 125 of first LEDs 130 that emit first LED light 135. The first LED filament further includes a first encapsulant 140 that surrounds the first array of first LEDs. The first encapsulant includes a first luminescent material 145 configured to convert the emitted first LED light into first converted light 150. The LED filament configuration further includes a second LED filament 155 that includes a second array 170 of second LEDs 175 that emit second LED light 180, where the emitted second LED light is cyan light. Every first LED filament is positioned at least a distance D from every second LED filament. The LED filament configuration further includes a controller 185 coupled to the first array of first LEDs and the second array of second LEDs and configured to individually control the first array of first LEDs and the second array of second LEDs.

Description

[Technical Field]

[0001] The present invention relates generally to the field of light-emitting diode (LED) filament configurations. More specifically, the present invention relates to LED filament configurations that include individually controlled LEDs. [Background technology]

[0002] The use of light-emitting diodes (LEDs) for lighting purposes continues to attract attention. Compared to incandescent lamps, fluorescent lamps, neon lamps, etc., LEDs have many advantages, such as a longer operating life, reduced power consumption, and improved efficiency in terms of the ratio of light energy to heat energy. In particular, LED lamps are highly valued for their highly decorative and versatile appearance.

[0003] It is interesting to combine the above-mentioned advantageous properties of LEDs with those of filament lamps, which offer aesthetic design and a wide light distribution angle. It will be appreciated that combining the properties of filament lamps with LEDs is becoming a trend due to the high efficiency of LEDs, while achieving similarity to traditional incandescent lamps with visible filaments.

[0004] It will be appreciated that in addition to combining the aforementioned LED and traditional incandescent bulb characteristics, it may be desirable to emit light from such a configuration that has one or more advantageous properties. For example, melanopic light may provide the benefits of natural daylight indoors and further improve the visual comfort, well-being, and / or performance of individuals exposed to this type of light. It should be noted that the biological effects of light in industrial lighting solutions have often been ignored, with a focus on the visual function of light often taking priority. While melanopic light may enable faster recovery from illness, lower stress levels, and / or positively affect circadian rhythms, (typical) indoor electric light fails to address biological responses to light.

[0005] It would therefore be of interest to provide an illumination filament arrangement or system comprising LEDs that can also provide melanopic illumination. Summary of the Invention [Problem to be solved by the invention]

[0006] It is an object of the present invention to provide a lighting filament configuration that can provide the traditional look of a light bulb combined with the efficiency of an LED while simultaneously providing melanopic lighting. [Means for solving the problem]

[0007] This and other objects are achieved by an LED filament arrangement having the features of the independent claims. Preferred embodiments are defined in the dependent claims.

[0008] Thus, according to the present invention, there is provided a light-emitting diode (LED) filament configuration configured to emit LED filament configuration light, the LED filament configuration including at least one first LED filament configured to emit white LED filament light. The at least one first LED filament includes at least one first array of a plurality of first LEDs arranged on a first elongated carrier, the plurality of first LEDs configured to emit first LED light. The at least one first LED filament further includes at least one first encapsulant at least partially surrounding the first elongated carrier and at least partially surrounding the at least one first array of the plurality of first LEDs, the at least one first encapsulant including a first luminescent material configured to at least partially convert the emitted first LED light into a first converted light. The emitted white LED filament light includes at least one of the first converted light and the emitted first LED light. The LED filament configuration further includes at least one second LED filament configured to emit a second LED filament light. The at least one second LED filament includes a second elongated carrier and at least one second array of a plurality of second LEDs disposed on the second elongated carrier, the plurality of second LEDs configured to emit the second LED light. The emitted second LED light is cyan light having a cyan dominant peak wavelength λ in a wavelength range of 470 to 520 nm, and the emitted second LED filament light includes the emitted second LED light. Any LED filament of the at least one first LED filament is positioned at least a distance D from any LED filament of the at least one second LED filament.The LED filament configuration further includes a controller coupled to the at least one first array of the plurality of first LEDs and the at least one second array of the plurality of second LEDs, the controller configured to individually control the at least one first array of the plurality of first LEDs and the at least one second array of the plurality of second LEDs.

[0009] Thus, the present invention is based on the concept or idea of ​​providing an LED filament configuration capable of providing both white light and cyan light to provide melanopic light. This is achieved by separately arranging and individually controlling a first array of LEDs of a first LED filament(s) that emit white light and a second array of LEDs of a second LED filament(s) that emit cyan light. Thus, the present invention provides an LED filament configuration in which any LED filament of the first LED filament(s) is positioned at least a distance D from any LED filament of the second LED filament(s), thereby reducing interference between light emitted from the first LED filament(s) and the second LED filament(s).

[0010] It will be appreciated that the LED filament configuration includes a first LED filament(s) configured to emit white LED filament light and a second LED filament(s) configured to emit cyan light. This allows for a versatile LED filament configuration that addresses a variety of lighting needs, such as providing melanopic light. Furthermore, the LED filament configuration is advantageous in that it is aesthetically appealing. According to one example of the present invention, the emitted white LED filament light may have a correlated color temperature (CCT) in the range of 1800 to 6500 K and a color rendering index (CRI) of at least 80. This example is advantageous in that the emitted white LED filament light provides a comfortable lighting experience for the user.

[0011] It should be noted that the LED filament configuration allows for independent control of the first LED filament(s) and the second LED filament(s), which allows the LED filament configuration to be adapted to various lighting needs and / or desires, such as for providing light to specific areas within a larger space in which the LED filament configuration is placed.

[0012] It should also be noted that the independent control of the first and second LED filaments reduces the amount of crosstalk between the first and second LED filaments, which increases the range of melanopic activity of the LED filament-constituting light.

[0013] The present invention is further advantageous in that any LED filament of the first LED filament(s) is / are arranged at least a distance D away from any LED filament of the second LED filament(s). This arrangement further reduces the amount of crosstalk between the first LED filament(s) and the second LED filament(s). Thus, the range of melanopic activity of the LED filament-composed light is further expanded. In the context of this application, the expression "arranged separately" means not physically together with one another.

[0014] According to the present invention, there is provided an LED filament configuration comprising a first elongated carrier and a second elongated carrier. The term "carrier" as used herein means an (elongated) element, body, structure, etc. suitable for or configured to have an LED disposed thereon. The LED filament configuration further comprises at least one first encapsulant. "Encapsulant" as used herein means a material, element, arrangement, etc. configured or arranged to at least partially surround, encapsulate, and / or enclose the first elongated carrier and the first array(s) of a plurality of first LEDs. Furthermore, the at least one first encapsulant comprises a first luminescent material. "Luminescent material," as used herein, means a material, composition, and / or substance that is luminescent and configured to affect light such that at least some light passes through the luminescent material. The LED filament configuration further includes a controller coupled to the first array(s) of the plurality of first LEDs and the second array(s) of the plurality of second LEDs. The term "controller," as used herein, means a control unit, device, configuration, etc. The term "coupled," as used herein, means connected, linked, and / or paired to the first and second arrays of the plurality of first LEDs and second LEDs such that the controller can control the first and second arrays, respectively (individually).

[0015] In some embodiments, the emitted white LED filament light may include (i) the first converted light or (ii) the first converted light and the emitted first LED light.

[0016] In some embodiments, at least 80% of the total luminous flux of the emitted second LED filament light may be in the wavelength range of 480 nm or greater, or in the wavelength range of 485 nm or greater, or in the wavelength range of 490 nm or greater, which further reduces crosstalk because (most of) the emitted second LED filament light cannot excite the first luminescent material, which includes a M'xM2-2xAX6-type phosphor doped with tetravalent manganese (where M' includes an alkaline earth cation, M includes an alkali cation, x is in the range of 0 to 1, A includes a tetravalent cation, and X includes a monovalent anion, including at least fluorine (F)).

[0017] In some embodiments, the distance D may be at least 5 mm, more preferably at least 10 mm, and most preferably at least 15 mm. In some embodiments, the distance D may be at most 30 mm or at most 50 mm.

[0018] In some embodiments, at least 60% or at least 70% of the total luminous flux of the emitted second LED filament light may be in the wavelength range of 480-520 nm.

[0019] In one embodiment, the emitted second LED light may be cyan light having a cyan main peak wavelength λ in the wavelength range of 480 to 520 nm, or in the wavelength range of 485 to 520 nm, or in the wavelength range of 490 to 520 nm.

[0020] In some embodiments, the white LED filament light may have a correlated color temperature in the range of 1700 K to 2500 K. In some embodiments, the white light is light that is within 15 SDCM of the black body line, preferably within 10 SDCM of the black body line, and more preferably within 5 SDCM of the black body line.

[0021] In one embodiment, the cyan main peak wavelength λ may be in the wavelength range of 490 to 505 nm or 490 to 500 nm.

[0022] In some embodiments, the LED filament light may include a white LED filament light and a second LED filament light, and optionally, the LED filament light may be a white light having a correlated color temperature in a range of, for example, 2000 K to 6500 K and a CRI of, for example, at least 80 or at least 85. The controller may be configured to control the correlated color temperature of the LED filament light from a first correlated color temperature to a second correlated color temperature different from the first correlated color temperature, for example, having a difference of at least 500 K or at least 1000 K. Using a combination of the white LED filament light and the second LED filament light makes it possible to control the correlated color temperature of the LED filament light relatively close to the BBL, for example, particularly when the white LED filament light has a correlated color temperature in a range of 1700 K to 2500 K.

[0023] According to one embodiment of the present invention, the controller may be configured to receive control instructions from a user interface UI that is arranged to receive input from a user. This embodiment is advantageous in that the controller may receive control instructions from a (remote) UI regarding how to control the first array(s) of the plurality of first LEDs and the second array(s) of the plurality of second LEDs, and the UI may be arranged to receive input from a user. This allows for increased control of the LED filament configuration. Furthermore, this embodiment makes it easier for the user to control the LED filament configuration.

[0024] According to one embodiment of the present invention, the first luminescent material may include a red phosphor configured to at least partially convert the emitted first LED light into first converted light comprising red light in a wavelength range of 600-700 nm, and a green-yellow phosphor configured to at least partially convert the emitted first LED light into first converted light comprising green-yellow light in a wavelength range of 500-600 nm. Thus, the first luminescent material may include a red phosphor and a green-yellow phosphor, each configured to convert at least a portion of the emitted first LED light in accordance with the above-mentioned conditions. This embodiment is advantageous, among other things, in that it can convert the emitted first LED light into the (first) converted light. This allows this embodiment to be more versatile with respect to various lighting needs and / or requirements, e.g., providing light within a specific wavelength range.

[0025] According to one embodiment of the present invention, the LED filament arrangement may be configured to operate in either a first operating mode, in which the emitted LED filament arrangement light may include an emitted white LED filament light and an emitted second LED filament light, or a second operating mode, in which the emitted LED filament arrangement light may include either an emitted white LED filament light or an emitted second LED filament light. Thus, the LED filament arrangement light may include an emitted white LED filament light and an emitted second LED filament light according to the first operating mode, or alternatively, may include an emitted white LED filament light or an emitted second LED filament light according to the second operating mode. This embodiment advantageously provides a more adaptable LED filament arrangement to meet various lighting needs and / or desires. An example may include enabling an emitted LED filament arrangement light that includes both an emitted white LED filament light and an emitted second LED filament light, or only one of them.

[0026] According to one embodiment of the present invention, at least one of the at least one first LED filament may be disposed obliquely relative to at least one of the at least one second LED filament. Thus, the first LED filament(s) may be disposed obliquely (i.e., tilted or angled) relative to the second LED filament(s). This embodiment is advantageous, among other things, in that the arrangement of the first LED filament(s) and the second LED filament(s) may reduce shadows cast from the LED filament configuration. This embodiment is further advantageous in that it may provide more uniform illumination. Furthermore, this embodiment is preferred because it is aesthetically appealing. Furthermore, this embodiment may provide the desirable effect of reducing the amount of crosstalk.

[0027] According to one embodiment of the present invention, the controller may be configured to individually control the plurality of first LEDs and the plurality of second LEDs, respectively, by gradual changes in at least one of the intensity, beam direction, and beam distribution of the emitted first LED light and the emitted second LED light. Thus, the controller may individually control the first LEDs and the second LEDs, respectively, based on gradual changes in the intensity, beam direction, and / or beam distribution of the emitted first LED light and the emitted second LED light. This embodiment is advantageous in that the control of the above-described settings of the emitted first LED light and the emitted second LED light results in a more adaptable LED filament configuration for various lighting needs, requirements, and / or desired settings. Additionally, the controller provides increased control over the distribution and overall effect of the emitted first LED light and the emitted second LED light. Therefore, the amount of crosstalk may be further reduced.

[0028] According to one embodiment of the present invention, the LED filament configuration may extend along a longitudinal axis LA. The LED filament configuration may include at least two first LED filaments symmetrically arranged with respect to the longitudinal axis LA, and / or at least two second LED filaments symmetrically arranged with respect to the longitudinal axis LA. Thus, the LED filament configuration may include two or more first LED filaments symmetrically arranged with respect to the longitudinal axis LA and / or two or more second LED filaments symmetrically arranged with respect to the longitudinal axis LA. This embodiment is advantageous because emitted LED filament configuration light may be more uniformly distributed. In addition, this embodiment may provide a more aesthetically appealing LED filament configuration.

[0029] According to one embodiment of the present invention, the at least one second LED filament may further include at least one second encapsulant at least partially surrounding the second elongated carrier and at least partially surrounding the at least one second array of a plurality of second LEDs. The at least one second encapsulant may include a second luminescent material configured to at least partially convert emitted second LED light into second converted light, and the emitted second LED filament light may include the second converted light. Thus, the second LED filament(s) may include second encapsulant(s) that may include a second luminescent material configured to convert at least a portion of the emitted second LED light into the second converted light. This embodiment is advantageous, among other things, in that it may convert emitted second LED light into the (second) converted light. This allows the embodiment to be more adaptable to various lighting needs and / or desires, such as providing light within a specific wavelength range.

[0030] According to one embodiment of the present invention, at least 60% of the total luminous flux of the emitted second LED filament light may be in the wavelength range of 470 to 520 nm. This embodiment is advantageous in that at least 60% of the total luminous flux of the emitted second LED filament light can be confined within a narrower wavelength range. This can reduce the risk that the wavelength range of the total luminous flux of the emitted second LED filament light overlaps with the excitation spectrum and / or emission spectrum of the first luminescent material. Therefore, the risk of the emitted second LED filament light being converted by the first luminescent material can be reduced. This is preferable because the risk of crosstalk is further reduced. Thus, the range of melanopic activity of the LED filament light is increased.

[0031] According to one embodiment of the present invention, the cyan dominant peak wavelength λ and at least 60% of the total luminous flux of the emitted second LED filament light may be in the wavelength range of 470 to 520 nm. This embodiment is advantageous in that the cyan dominant peak wavelength λ and at least 60% of the total luminous flux of the emitted second LED filament light may be confined within a narrower wavelength range. Therefore, the amount of crosstalk may be further reduced, which is preferable because the range of melanopic activity is increased. Furthermore, this embodiment may improve the quality of the emitted LED filament light, for example, with respect to the CCT and / or CRI of the emitted LED filament light.

[0032] According to one embodiment of the present invention, the cyan main peak wavelength λ and at least 80% of the total luminous flux of the emitted second LED filament light may be in the wavelength range of 480-510 nm. This embodiment is particularly advantageous in that the cyan main peak wavelength λ and at least 80% of the total luminous flux of the emitted second LED filament light can be confined within a narrower wavelength range. Therefore, the risk of crosstalk can be further reduced and the range of melanopic activity can be increased.

[0033] According to one embodiment of the present invention, the emitted first LED light may be UV light. Furthermore, the first luminescent material may include a blue phosphor configured to at least partially convert the emitted first LED light into a first converted light comprising blue light having a peak wavelength in the wavelength range of 400 to 470 nm. Thus, the first luminescent material may include a blue phosphor configured to convert at least a portion of the emitted first LED light, which may be UV light, in accordance with the above-mentioned conditions. This embodiment is advantageous, among other things, in that it can convert the emitted first LED light into the first converted light. This allows this embodiment to be more versatile with respect to various lighting needs and / or requirements, for example, to provide light within a specific wavelength range. Furthermore, this embodiment allows the use of UV light as a light source for the first LED light, providing a more adaptable LED filament configuration.

[0034] According to one embodiment of the present invention, the first luminescent material is ABO 12 :Ce type luminescent materials, A may include one or more of Y, La, Gd, Tb and Lu, and B may include one or more of Al, Ga, In and Sc.

[0035] According to one embodiment of the present invention, the first luminescent material comprises a phosphor of M'xM2-2xAX6 type doped with tetravalent manganese, where M' comprises an alkaline earth cation, M comprises an alkali cation, x is in the range of 0 to 1, A comprises a tetravalent cation, and X may comprise a monovalent anion, including at least fluorine (F).

[0036] According to one embodiment of the present invention, the first luminescent material may include at least one of a lutetium aluminum garnet (LuAG) phosphor, a yttrium aluminum garnet (YAG) phosphor, and a potassium silicon fluorine (KSiF) phosphor. Thus, the first luminescent material may include a LuAG phosphor, a YAG phosphor, and / or a KSiF phosphor. This embodiment is advantageous in that the dominant peak wavelength of the emission spectrum of the first converted light from the first luminescent material may be different from the dominant peak wavelength of the emitted second LED light. Therefore, this embodiment may further reduce the risk of crosstalk between the first LED filament(s) and the second LED filament(s).

[0037] According to one embodiment of the present invention, an LED filament lamp is provided, including an LED filament arrangement and a cover including an at least partially transparent material. The cover at least partially surrounds at least one first LED filament and at least one second LED filament. The LED filament lamp further includes a connector electrically connected to the at least one first LED filament and at least one second LED filament for supplying power to the plurality of first LEDs of the first LED filament(s) and the plurality of second LEDs of the second LED filament(s). The term "cover" as used herein refers to an envelope, casing, etc. The cover includes a (at least partially) transparent material. The term "transparent material" as used herein refers to a material, composition, and / or substance that is transparent and / or translucent. The material is configured to affect light so that at least some light can pass through the cover. The LED filament lamp further includes an (electrical) connector. The term (electrical) "connector" is used herein to mean a coupling, cable, etc. that establishes an (electrical) power connection between participating elements, components, etc. This embodiment is advantageous in that the LED filament lamp includes a cover that at least partially surrounds the first LED filament(s) and the second LED filament(s). This provides a protective barrier, blockade, etc. against physical contact of the first LED filament(s) and the second LED filament(s). This is preferable as components such as LED filaments can be sensitive to physical contact.

[0038] According to one embodiment of the present invention, the LED filament configuration may extend along a longitudinal axis LA, and at least one of the at least one second LED filament may be positioned closer to the longitudinal axis LA compared to at least one of the at least one first LED filament. Thus, the second LED filament(s) may be positioned closer to the longitudinal axis LA relative to the first LED filament(s). This embodiment is advantageous in that it provides an aesthetically pleasing LED filament configuration. The lighting experience may be further enhanced, for example, due to a more uniform light distribution.

[0039] According to one embodiment of the present invention, the at least one second LED filament may include only second LEDs, ie, only "cyan" LEDs.

[0040] Further objects, features, and advantages of the present invention will become more apparent upon review of the following detailed disclosure, drawings, and appended claims. Those skilled in the art will recognize that various features of the present invention can be combined to create embodiments other than those described below. [Brief explanation of the drawings]

[0041] This and other aspects of the invention will now be described in more detail with reference to the accompanying drawings, in which embodiment(s) of the invention are shown. [Figure 1] 1 is a schematic diagram of an LED filament configuration according to an exemplary embodiment of the present invention. [Figure 2] 1 is a schematic diagram of an LED filament configuration according to an exemplary embodiment of the present invention, the LED filament configuration extending along a longitudinal axis LA. [Figure 3] 1 is a schematic diagram of an LED filament lamp including an LED filament configuration according to an exemplary embodiment of the present invention. [Figure 4] Schematic showing the excitation and emission of KSiF phosphor. DETAILED DESCRIPTION OF THE INVENTION

[0042] FIG. 1 is a schematic diagram of an LED filament configuration 100 according to an exemplary embodiment of the present invention.

[0043] The LED filament configuration 100 of FIG. 1 is configured to emit LED filament configuration light 105. The LED filament configuration 100 includes first LED filament(s) 110 configured to emit white LED filament light 115 and second LED filament(s) 155 configured to emit second LED filament light 160. For simplicity, only the (single) first LED filament 110 and the (single) second LED filament 155 are shown in FIG. 1 . The second LED filament light 160 includes a second LED light 180 that is cyan light having a dominant cyan peak wavelength λ in the wavelength range of 470 to 520 nm. Preferably, the first LED filament 110 and / or the second LED filament 155 have a length L and a width W, where L>5W. The first LED filament 110 and / or the second LED filament 155 may be arranged in a straight configuration or in a non-straight configuration, such as a curved configuration, a 2D / 3D spiral, or a helix.

[0044] The first LED filament(s) 110 include a first array(s) 125 of a plurality of first LEDs 130 arranged on a first elongated carrier 120, where the plurality of first LEDs 130 are configured to emit first LED light 135. The first LED light 135 may be, for example, blue light in a wavelength range of 400 to 490 nm. The second LED filament(s) 155 include a second array(s) 170 of a plurality of second LEDs 175 arranged on a second elongated carrier 165, where the plurality of second LEDs 175 are configured to emit second LED light 180. The first elongated carrier 120 and / or the second elongated carrier 165 may be, for example, a substrate, etc., which may be rigid (e.g., made from a polymer, glass, quartz, metal, or sapphire) or flexible (e.g., made from a polymer or metal, e.g., a film or foil). Furthermore, the first elongate carrier 120 and / or the second elongate carrier 165 may be (at least partially) transparent and / or translucent. In other words, the first elongate carrier 120 and / or the second elongate carrier 165 may be configured to interact with the first LED light 135 and / or the second LED light 180, respectively, such that at least a portion of the emitted first LED light 135 and / or the emitted second LED light 180 can pass through.

[0045] The first LED filament(s) 110 further include at least one first encapsulant 140 that at least partially surrounds the first elongate carrier 120 and at least partially surrounds the first array(s) 125 of the plurality of first LEDs 130. Thus, the first encapsulant(s) 140 may completely or only partially surround the first elongate carrier 120 and the first array(s) 125. In some embodiments, the first LED filament(s) 110 include a primary encapsulant and a secondary encapsulant of the first encapsulant 140. The primary encapsulant of the first encapsulant 140 may at least partially surround a first side of the first elongate carrier 120. The secondary encapsulant of the first encapsulant 140 may at least partially surround a second side of the first elongate carrier 120 opposite the first side of the first elongate carrier 120. The primary encapsulant of the first encapsulant 140 may be disposed separately from the secondary encapsulant of the first encapsulant 140. It should be understood that the disposition of the first encapsulant 140 relative to one another may vary depending on the embodiment. In some embodiments, the primary encapsulant and secondary encapsulant of the first encapsulant 140 may at least partially overlap one another. The first encapsulant(s) 140 may be a polymeric material, such as silicone, which may be flexible. Additionally, the first encapsulant(s) 140 may have an elongate shape. The first encapsulant(s) 140 include a first luminescent material 145 configured to at least partially convert the emitted first LED light 135 into first converted light 150. The first luminescent material 145 includes a red phosphor and a green-yellow phosphor. The red phosphor is configured to at least partially convert the emitted first LED light 135 into first converted light 150 comprising red light in a wavelength range of 600-700 nm. The green-yellow phosphor is configured to at least partially convert the emitted first LED light 135 into first converted light 150 comprising green-yellow light in a wavelength range of 500-600 nm.The white LED filament light 115 includes the first converted light 150 and / or the emitted first LED light 135 .

[0046] The first LED filament(s) 110 are positioned a (minimum) distance D from the second LED filament(s) 155. This positions the first LED filament(s) 110 away from the second LED filament(s) 155. The distance D may be set to minimize the amount of crosstalk between the emitted white LED filament light 115 and the emitted second LED light 180.

[0047] 1 further includes a controller 185 coupled to the first array(s) 125 of the plurality of first LEDs 130 and the second array(s) 170 of the plurality of second LEDs 175. The controller 185 may be wired or wirelessly coupled or connected to the first array(s) 125 and the second array(s) 170. The controller 185 is configured to individually control the first array(s) 125 and the second array(s) 170. The controller 185 may individually control the first array(s) 125 and the second array(s) 170 simultaneously or sequentially. One or more control settings of the controller 185 may differ between the first array(s) 125 and the second array(s) 170. The controller 185 may further be configured to receive control commands from a user interface (UI) 1000, which may be arranged to receive input from a user. In other words, the controller 185 may be controlled by the UI 1000. The control commands may, for example, relate to changing the luminous flux of the emitted white LED filament light 115 compared to the luminous flux of the emitted second LED filament light 160. The controller 185 may be configured to receive control commands from the UI 1000 in a wired or wireless manner. According to one example, the controller 185 includes an antenna, e.g., a transceiver, which is (electrically) coupled to the controller 185. The antenna is configured to receive control commands from the UI 1000. Furthermore, the antenna is configured to send control commands to the controller 185. Thus, the controller 185 may receive control commands from the UI 1000 via the antenna.

[0048] The LED filament arrangement light 105 includes at least a portion of the emitted white LED filament light 115 and / or at least a portion of the emitted second LED filament light 160. The white LED filament light 115 and the second LED filament light 160 are associated with a first operating mode and a second operating mode, respectively. The LED filament arrangement 100 is configured to operate in either the first operating mode or the second operating mode. The first operating mode may be configured to override the second operating mode when operated, or vice versa. During the first operating mode, the emissions of the white LED filament light 115 and the second LED filament light 160 form melanopic light as the emitted LED filament arrangement light 105. The white LED filament light 115 may have a CCT in the range of 1800 to 6500K. Furthermore, the white LED filament light 115 may have a CRI of at least 80.

[0049] 2 is a schematic diagram of an LED filament configuration 100 according to an exemplary embodiment of the present invention, where the LED filament configuration 100 extends along a longitudinal axis LA. It should be noted that the LED filament configuration 100 shown in FIG. 2 has several features in common with the LED filament configuration 100 shown in FIG. 1, and thus reference is made to FIG. 1 and associated text to enhance an understanding of several features and / or functions of the LED filament configuration 100.

[0050] The LED filament configuration 100 of FIG. 2 includes two first LED filaments 110 and two second LED filaments 155. Note that the number of the first LED filaments 110 and the number of the second LED filaments 155 may vary depending on the embodiment. Furthermore, the number of the first LED filaments 110 and the number of the second LED filaments 155 may differ from each other. In FIG. 2, the first LED filament 110a of the first LED filament 110 is disposed at a first distance D1 from the first LED filament 155a of the second LED filament 155. Furthermore, the second LED filament 110b of the first LED filament 110 is disposed at a second distance D2 from the second LED filament 155b of the second LED filament 155. The first distance D1 and the second distance D2 satisfy D<=D1, D2. Therefore, the first distance D1 and the second distance D2 may be the same as or greater than the distance D. Furthermore, the first distance D1 may be different from the second distance D2. Thus, any LED filament of the first LED filaments 110 is positioned at least a distance D from any LED filament of the second LED filaments 155. In FIG. 2, D=D1=D2. The first LED filaments 110 and the second LED filaments 155 may be arranged according to various patterns and / or designs other than the embodiment shown in FIG. 2.

[0051] The first LED filament 110a and the second LED filament 110b of the first LED filament 110 in FIG. 2 are respectively disposed obliquely (i.e., tilted or angled) relative to the first LED filament 155a and the second LED filament 155b of the second LED filament 155. Note that not all of the first LED filaments 110 need be disposed obliquely relative to the second LED filaments 155. In some embodiments, only one first LED filament 110 may be disposed in this manner. In FIG. 2, the first LED filament 110a of the first LED filament 110 is disposed obliquely at a first angle α1 relative to the first LED filament 155a of the second LED filament 155, and the second LED filament 110b of the first LED filament 110 is disposed obliquely at a second angle α2 relative to the second LED filament 155b of the second LED filament 155. The first angle α1 and the second angle α2 satisfy the conditions of 5°<=α1 and α2<=80°. Preferably, the first angle α1 and the second angle α2 satisfy the conditions of 30°<=α1 and α2<=70°. Note that the first angle α1 and the second angle α2 may be the same or different. Therefore, the first LED filament 110a and the second LED filament 110b of the first LED filament 110 may have the same or different inclinations relative to the first LED filament 155a and the second LED filament 155b of the second LED filament 155, respectively. In FIG. 2, α=α1=α2.

[0052] In Fig. 2, the LED filament configuration 100 extends along a longitudinal axis LA. According to the embodiment shown in Fig. 2, both the first LED filament 110 and the second LED filament 155 are arranged symmetrically with respect to the longitudinal axis LA. It should be noted that it is also possible for only the first LED filament 110 or only the second LED filament 155 to be arranged symmetrically with respect to the longitudinal axis LA. Furthermore, it is not necessary for all LED filaments of the first LED filament 110 and / or all LED filaments of the second LED filament 155 to be arranged symmetrically with respect to the longitudinal axis LA.

[0053] The LED filament configuration 100 of FIG. 2 includes a controller 185. The controller 185 is configured to individually control the plurality of first LEDs 130 and the plurality of second LEDs 175 by gradually changing the intensity, beam direction, and / or beam distribution of the emitted first LED light 135 and the emitted second LED light 180, respectively. For example, the beam directions of the emitted first LED light 135 and the emitted second LED light 180 may be individually directed to minimize interference therebetween. Furthermore, the intensities of the emitted first LED light 135 and the emitted second LED light 180 may be individually adjusted to achieve a desired intensity ratio between the emitted first LED light 135 and the emitted second LED light 180. The controller 185 is further configured to receive control commands from a user interface (UI) 1000, which may be arranged to receive input from a user. The control instructions may relate, for example, to the luminous flux, intensity, beam direction and / or beam distribution of the emitted white LED filament light 115 and the emitted second LED filament light 160.

[0054] The first LED filament(s) 110 includes at least one first encapsulant 140 including a first luminescent material 145. According to the embodiment shown in FIG. 2, the first luminescent material 145 includes a blue phosphor configured to at least partially convert the emitted first LED light 135 into first converted light 150. The first converted light 150 includes blue light having a peak wavelength in a wavelength range of 400 to 470 nm. Furthermore, the emitted first LED light 135 is UV light. The UV light may be, for example, UVA, UVB, and / or UVC light. Thus, according to the embodiment shown in FIG. 2, the emitted first LED light 135 is at least partially converted by the blue phosphor into the first converted light 150 including blue light. According to an example, the first luminescent material 145 may further include a red phosphor and a green-yellow phosphor. The red phosphor is configured to at least partially convert the emitted first LED light 135 into first converted light 150 comprising red light in a wavelength range of 600-700 nm, and the green-yellow phosphor is configured to at least partially convert the emitted first LED light 135 into first converted light 150 comprising green-yellow light in a wavelength range of 500-600 nm. The emitted white LED filament light 115 comprises the first converted light 150 and / or the emitted first LED light 135, where the first converted light 150 may comprise blue, red, and green-yellow light. Examples of specific phosphors that the first luminescent material 145 may comprise are lutetium aluminum garnet (LuAG) phosphor, yttrium aluminum garnet (YAG) phosphor, and / or potassium silicon fluoride (KSiF) phosphor. FIG. 4 shows the excitation and emission spectra of KSiF phosphor.

[0055] The second LED filament(s) 155 further include at least one second encapsulant 190 that at least partially surrounds the second elongated carrier 165 and at least partially surrounds the second array(s) 170 of the plurality of second LEDs 175. Thus, the second encapsulant(s) 190 may completely or only partially surround the second elongated carrier 165 and the second array(s) 170. In some embodiments, the second LED filament(s) 155 include a primary encapsulant and a secondary encapsulant of the second encapsulant 190. The primary encapsulant of the second encapsulant 190 may at least partially surround a first side of the second elongated carrier 165. The secondary encapsulant of the second encapsulant 190 may at least partially surround a second side of the second elongated carrier 165 opposite the first side of the second elongated carrier 165. The primary encapsulant of the second encapsulant 190 may be positioned separately from the secondary encapsulant of the second encapsulant 190. It should be understood that the positioning of the second encapsulant 190 relative to one another may vary depending on the embodiment. In some embodiments, the primary encapsulant and secondary encapsulant of the second encapsulant 190 may at least partially overlap one another. The second encapsulant(s) 190 may be a polymeric material, such as silicone, which may be flexible. Additionally, the second encapsulant(s) 190 may have an elongated shape. The second encapsulant(s) 190 include a second luminescent material 195 configured to at least partially convert the emitted second LED light 180 into second converted light 200, and the emitted second LED filament light 160 includes the second converted light 200.

[0056] The second LED filament(s) 155 configured to emit the second LED filament light 160 include a second array(s) 170 of a plurality of second LEDs 175 configured to emit the second LED light 180, which is cyan light. Preferably, at least 60% of the total luminous flux of the emitted second LED filament light 160 is in the wavelength range of 470 to 520 nm. More preferably, at least 60% of the total luminous flux of the emitted second LED filament light 160 is in the wavelength range of 470 to 500 nm. Furthermore, the cyan light has a dominant cyan peak wavelength λ in the same wavelength range of 470 to 500 nm. Most preferably, at least 80% of the total luminous flux of the emitted second LED filament light 160 is in the wavelength range of 480 to 510 nm. Furthermore, the cyan light has a dominant cyan peak wavelength λ in the same wavelength range of 480 to 510 nm.

[0057] Figure 3 is a schematic diagram of an LED filament lamp 300 including an LED filament configuration 100 according to an exemplary embodiment of the present invention. It should be noted that the LED filament configuration 100 shown in Figure 3 has several features in common with the LED filament configuration 100 shown in Figures 1 and 2, and therefore reference is made to Figures 1, 2 and associated text to enhance an understanding of some features and / or functions of the LED filament configuration 100.

[0058] The LED filament lamp 300 further includes a cover 205 comprising an at least partially transparent material. The cover 205 at least partially surrounds the first LED filament(s) 110 and the second LED filament(s) 155. Thus, the cover 205 may completely or only partially surround the first LED filament(s) 110 and / or the second LED filament(s) 155. The LED filament lamp 300 further includes a connector 210 electrically connected to the first LED filament(s) 110 and the second LED filament(s) 155. This connection provides a power supply to the plurality of first LEDs 130 of the first LED filament(s) 110 and the plurality of second LEDs 175 of the second LED filament(s) 155. The connector 210 may be positioned to provide an electrical connection between the LED filament lamp 300 and a lighting fixture / lamp socket. According to one example, a system including the LED filament lamp 300 and a user interface (UI) 1000 is provided. The UI 1000 is arranged to provide control instructions to the controller 185. Examples of the control instructions may be the luminous flux, intensity, beam direction, and / or beam distribution of the emitted white LED filament light 115 and the emitted second LED filament light 160. The UI 1000 is further arranged to receive input from a user. Thus, the controller 185 receives the control instructions from the UI 1000, and the control instructions may be based at least on the input from the user.

[0059] 3 , the LED filament configuration 100 extends along a longitudinal axis LA. Furthermore, the second LED filament(s) 155 are disposed closer to the longitudinal axis LA compared to the first LED filament(s) 110, which are disposed relative to the longitudinal axis LA. Note that this condition need only apply, for example, between one second LED filament 155 and one first LED filament 110. Furthermore, the second LED filament(s) 155 may extend along the longitudinal axis LA and be coincident with the longitudinal axis LA.

[0060] Those skilled in the art will recognize that the present invention is by no means limited to the above-described preferred embodiment. On the contrary, many modifications and variations are possible within the scope of the appended claims. For example, one or more of the first LED filament(s) 110, the second LED filament(s) 155, the cover 205, etc. may have different shapes, dimensions, and / or sizes than those shown / described.

Claims

1. 1. A light emitting diode (LED) filament arrangement, the LED filament arrangement configured to emit light, the LED filament arrangement comprising: at least one first LED filament configured to emit white LED filament light; a first elongated carrier; at least one first array of a plurality of first LEDs disposed on the first elongated carrier, the plurality of first LEDs configured to emit first LED light; and at least one first encapsulant at least partially surrounding the first elongated carrier and at least partially surrounding the at least one first array of the plurality of first LEDs, the at least one first encapsulant including a first luminescent material configured to at least partially convert the emitted first LED light into a first converted light, and the emitted white LED filament light includes (i) the first converted light or (ii) the first converted light and the emitted first LED light; at least one first LED filament comprising: Second LED Filament: At least one second LED filament configured to emit light, a second elongated carrier; and at least one second array of a plurality of second LEDs disposed on the second elongated carrier, the plurality of second LEDs configured to emit second LED light, the emitted second LED light being cyan light having a cyan dominant peak wavelength in a wavelength range of 470 to 520 nm, and the emitted second LED filament light comprising the emitted second LED light; at least one second array of a plurality of second LEDs, wherein every LED filament of the at least one first LED filament is positioned at least a distance D from every LED filament of the at least one second LED filament; at least one second LED filament comprising: a controller coupled to the at least one first array of the plurality of first LEDs and the at least one second array of the plurality of second LEDs, the controller configured to individually control the at least one first array of the plurality of first LEDs and the at least one second array of the plurality of second LEDs; Including, At least 80% of the total luminous flux of the emitted second LED filament light is in a wavelength range of 480 nm or greater; The LED filament configuration, wherein the first luminescent material comprises a phosphor of the M'xM2-2xAX6 type doped with tetravalent manganese, where M' comprises an alkaline earth cation, M comprises an alkali cation, x is in the range of 0 to 1, A comprises a tetravalent cation, and X comprises a monovalent anion, including at least fluorine (F).

2. 10. The LED filament configuration of claim 1, wherein the controller is configured to receive control commands from a user interface arranged to receive input from a user.

3. The first luminescent material comprises: a green-yellow phosphor configured to at least partially convert the emitted first LED light into first converted light comprising green-yellow light in a wavelength range of 500 to 600 nm; 3. The LED filament configuration of claim 1 or 2, comprising:

4. The LED filament configuration is: a first operating mode, wherein the emitted LED filament light includes the emitted white LED filament light and the emitted second LED filament light; and a second operating mode, wherein the emitted LED filament light comprises either the emitted white LED filament light or the emitted second LED filament light; 4. An LED filament arrangement according to claim 1, configured to operate in either

5. 5. The LED filament configuration according to claim 1, wherein at least one of the at least one first LED filament is disposed obliquely relative to at least one of the at least one second LED filament.

6. 6. The LED filament configuration of claim 1, wherein the controller is configured to individually control the plurality of first LEDs and the plurality of second LEDs by incrementally varying at least one of an intensity, a beam direction, and a beam distribution of the emitted first LED light and the emitted second LED light, respectively.

7. The LED filament configuration extends along a longitudinal axis; the LED filament configuration includes at least two first LED filaments arranged symmetrically with respect to the longitudinal axis; and the LED filament configuration includes at least two second LED filaments arranged symmetrically with respect to the longitudinal axis; 7. The LED filament configuration according to claim 1, wherein at least one of the following is satisfied.

8. The at least one second LED filament comprises: at least one second encapsulant at least partially surrounding the second elongated carrier and at least partially surrounding the at least one second array of the plurality of second LEDs, the at least one second encapsulant including a second luminescent material configured to at least partially convert the emitted second LED light into a second converted light; the emitted second LED filament light includes the second converted light; at least one second encapsulant; 8. An LED filament configuration according to any one of claims 1 to 7, comprising:

9. 9. The LED filament configuration according to claim 1, wherein the emitted second LED light is cyan light having a cyan dominant peak wavelength in the wavelength range of 480 to 520 nm.

10. 10. An LED filament arrangement according to claim 1, wherein the distance D is at least 15 mm.

11. 11. An LED filament arrangement according to any one of claims 1 to 10, wherein at least 60% of the total luminous flux of the emitted second LED filament light is in the wavelength range of 480 to 520 nm.

12. 12. The LED filament configuration of claim 1, wherein the emitted first LED light is UV light and the first luminescent material comprises a blue phosphor configured to at least partially convert the emitted first LED light into first converted light comprising blue light having a peak wavelength in a wavelength range of 400 to 470 nm.

13. 13. An LED filament configuration according to any one of claims 1 to 12, wherein the first luminescent material comprises at least one of a lutetium aluminum garnet (LuAG) phosphor, a yttrium aluminum garnet (YAG) phosphor, and a potassium silicon fluoride (KSiF) phosphor.

14. An LED filament arrangement according to any one of claims 1 to 13; a cover comprising an at least partially transparent material, the cover at least partially surrounding the at least one first LED filament and the at least one second LED filament; a connector electrically connected to the at least one first LED filament and the at least one second LED filament for supplying power to the plurality of first LEDs of the first LED filament and the plurality of second LEDs of the second LED filament; 1. An LED filament lamp comprising:

15. 15. The LED filament lamp of claim 14, wherein the LED filament configuration extends along a longitudinal axis, and at least one of the at least one second LED filament is positioned closer to the longitudinal axis than at least one of the at least one first LED filament that is positioned relative to the longitudinal axis.

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