Led filament comprising elements

Abstract

An LED filament (100) is configured to emit LED filament light (105) in operation. The LED filament includes: an elongated carrier (110) including a first main surface (112); an array of a plurality of LEDs (120) disposed on the first main surface, wherein the plurality of LEDs are configured to emit LED light (125); and an elongated package (130) including a light-emitting material and / or a light-scattering material. The LED filament also includes a plurality of elements (200) disposed on at least a portion of the elongated package, wherein the plurality of elements include transparent faceted particles (210) and / or transparent microlenses (220), the transparent faceted particles and / or transparent microlenses being arranged to refract, disperse, reflect and / or diffract the converted light and / or scattered light into the emitted LED filament light.

Description

Technical Field

[0001] This invention relates generally to light-emitting diode (LED) filaments. More specifically, this invention relates to LED filaments including components. Background Technology

[0002] The use of light-emitting diodes (LEDs) for illumination purposes continues to attract attention. Compared to incandescent lamps, fluorescent lamps, neon tubes, and other similar lights, LEDs offer numerous advantages, such as longer operating life, lower power consumption, and increased efficiency related to the ratio of light to heat energy. Specifically, LED filament lamps are highly appreciated for their aesthetic appeal.

[0003] Due to the advantages of using LEDs, interest in replacing conventional light sources with LEDs in many lighting arrangements has increased rapidly. It should be understood that this replacement (also known as retrofitting) is appreciated and desired by users who wish to achieve the look of incandescent bulbs. Light source replacement (retrofitting) is typically performed by removing (or replacing) conventional light sources from the luminaires (e.g., lamp holders) of the lighting arrangement and attaching LEDs, (or multiple) LED arrangements, or (or multiple) LED devices to the luminaires. One of these concepts is based on LED filaments placed within bulbs, as the appearance of such lamps is appreciated for its high decorative appeal.

[0004] WO2020 / 182925 provides an LED filament device comprising at least one LED filament, the LED filament further comprising an array of multiple LEDs. The LED filament also includes a substrate on which the multiple LEDs are disposed, wherein the surface of the substrate is arranged to influence the LED light.

[0005] One object of the present invention is to provide an LED filament that has a decorative lighting effect when the LED filament is in the on state and has a decorative effect when the LED filament is in the off state, while providing the LED with advantageous properties in terms of energy efficiency and light distribution.

[0006] US 2020 / 208009 discloses an LED filament. According to one embodiment, the LED filament includes an elongated substrate and a plurality of LEDs mechanically coupled to the substrate. The LED filament also includes: a package that is at least partially transparent, the package encapsulating the plurality of LEDs and at least partially encapsulating the substrate; and a plurality of particles that are at least partially reflective, the plurality of particles being disposed on the outer surface of the package. Summary of the Invention

[0007] Those interested in combining the advantageous properties of LEDs in terms of energy efficiency, light distribution, and / or aesthetics aim to provide LED filaments that have decorative lighting effects when the LED filament is in the on state and also have decorative effects when the LED filament is in the off state.

[0008] This and other objectives are achieved by providing an LED filament having the features of the independent claim. Preferred embodiments are defined in the dependent claims.

[0009] According to the present invention, a light-emitting diode (LED) filament configured to emit LED filament light in operation is provided. The LED filament includes: an elongated carrier including a first main surface; and an array of a plurality of LEDs disposed on the first main surface, wherein the plurality of LEDs are configured to emit LED light. The LED filament also includes an elongated encapsulation comprising at least one of a light-emitting material configured to at least partially convert the LED light emitted by the plurality of LEDs into converted light, and a light-scattering material configured to at least partially scatter the LED light into scattered light. The elongated encapsulation at least partially (e.g., at least 80% or at least 90%) covers the first main surface and at least partially surrounds the array of the plurality of LEDs. The LED filament also includes a plurality of elements disposed on at least a portion of the elongated encapsulation. The plurality of elements include, or at least one of substantially transparent faceted particles and substantially transparent microlenses, arranged to at least partially refract, at least partially disperse, at least partially reflect, and at least partially diffract the converted light and the scattered light into the emitted LED filament light.

[0010] The term "transparent" in this application should be understood to mean that at least 70% (or preferably at least 85%) of the light emitted by the LED filament will be transmitted through the faceted particles and / or microlenses at the first pass. The term "substantially" also emphasizes this point.

[0011] Therefore, the present invention is based on the concept of providing an LED filament comprising a plurality of elements in the form of transparent faceted particles and / or transparent microlenses arranged on an elongated package of an LED filament. During operation of the LED filament, the transparent elements are arranged to refract, disperse, reflect, and / or diffract the emitted LED filament light, thereby producing a decorative and aesthetically attractive lighting effect when the LED filament is in the on state.

[0012] The advantage of this invention is that the LED filament achieves a decorative lighting effect when the LED filament is in the on state, and provides a decorative effect when it is in the off state.

[0013] The advantage of this invention is that the LED filament can provide aesthetically attractive lighting effects, such as brilliance, sparkling starlight, and / or iridescent trails. The brilliance effect observed by the user / observer is achieved through the LED filament as white light enters from the top of the element, bounces around, and exits again through the top of the element. The flashing effect (which can also be described as a flickering effect) is achieved by the flickering of light reflected from the surface of the element when the LED filament is moved by the user / observer. The iridescent trail effect describes the rainbow colors seen by the user / observer due to the dispersion of light, and occurs when light enters the element at an angle, slows down, and disperses into different colors.

[0014] Another advantage of the invention is that the LED filament can provide a reduced yellow appearance, which therefore results in the exposure of the white LED filament during operation.

[0015] Another advantage of the present invention is that the LED filament can achieve improved thermal management during operation through its multiple components.

[0016] Another advantage of the invention is that the LED filament is able to combine its aesthetically attractive lighting effect with the desired lighting distribution during operation.

[0017] Another advantage of the present invention is that the LED filament can combine aesthetic advantages with the benefits of LED technology, meaning low power consumption, long operating life, and increased efficiency related to the ratio between light and heat energy.

[0018] An LED filament configured to emit LED light in operation includes an elongated carrier comprising a first main surface; and an array of multiple LEDs arranged on the first main surface, wherein the multiple LEDs are configured to emit LED light. By the term "carrier," it refers herein to an element, substrate, printed circuit board (PCB), etc., arranged to mechanically and / or electrically support the LEDs. Thus, multiple LEDs may be arranged, mounted, and / or mechanically coupled to / to the first main surface of the elongated carrier (e.g., a substrate), wherein the elongated carrier is configured to mechanically and / or electrically support the LEDs. The LED filament also includes an elongated encapsulation. By the term "encapsulation," it refers herein to a material, element, arrangement, etc., configured or arranged to at least partially surround, encapsulate, and / or surround the multiple LEDs and the elongated carrier. The encapsulation includes at least one of a luminescent material and a light-scattering material, the luminescent material being configured to at least partially convert the LED light emitted by the multiple LEDs into converted light, and the light-scattering material being configured to at least partially scatter the LED light into scattered light. Thus, the encapsulation includes a luminescent material and / or a light-scattering material having the properties described. The light scattering material can achieve forward and / or backscattering. The light scattering material may include an organosilicon matrix having at least one of Al2O3, BaSO4, TiO2, SiO2, CaF2, CaCO3, and BaTiO3 particles. The LED filament also includes a plurality of elements disposed on at least a portion of the elongated package. In other words, the LED filament may include a cover layer, etc., which includes a plurality of elements disposed on the elongated package. The plurality of elements (of the cover layer) are thus disposed or placed on, above, and / or in front of the package to at least partially protect, conceal, and / or surround the package. The plurality of elements includes (or) at least one of transparent faceted particles and transparent microlenses. Therefore, the plurality of elements includes, constitutes, or are transparent faceted particles and / or transparent microlenses. "Particles" refers to relatively small elements, beads, etc. "Faceted" here refers to particles comprising relatively small planar surfaces. "Microlenses" here refers to relatively small lenses disposed or configured to optically influence light. The transparent faceted particles and / or transparent microlenses are arranged to at least partially refract, at least partially disperse, at least partially reflect, and at least partially diffract the converted light and the scattered light into at least one of the emitted LED filament light. Therefore, the transparent faceted particles and / or transparent microlenses of the LED filament are arranged to optically influence the converted light and / or scattered light by at least partially refracting, at least partially dispersing, at least partially reflecting, and / or at least partially diffracting the converted light and / or scattered light into the emitted LED filament light.

[0019] According to one example of the invention, a plurality of elements can be arranged on at least a portion of an elongated package such that the elongated package is covered by at least 80%, preferably at least 90%, more preferably at least 95%, most preferably at least 98%, such as, for example, 100% or completely covered. Thus, the elongated package is covered by a relatively high degree of elements. An advantage of this example is that the high degree or high level of element coverage of the elongated package further enhances the optical effects on the converted and / or scattered light, which further contributes to the aesthetically attractive effect of the LED filament during operation.

[0020] According to one embodiment of the invention, a plurality of elements may constitute at least one element layer arranged to at least partially cover at least a portion of an elongated package. Preferably, the plurality of elements may constitute at least one element layer arranged to cover at least 80% or at least 90% of the elongated package. More preferably, the plurality of elements may constitute at least one element layer arranged to completely cover the elongated package. An advantage of this embodiment is that the refraction, dispersion, reflection, and / or diffraction of converted and / or scattered light can be increased, or even additionally, by the element layer(s), thereby further promoting an aesthetically attractive effect of the LED filament during operation (i.e., in the on-state), but also in the off-state.

[0021] According to one embodiment of the invention, at least one element layer can constitute a retroreflector. By the term "reflector," it is used here to refer to the ability of the element layer(s) to reflect light over a relatively wide range of incident angles. In a different interpretation, the retroreflector of this embodiment achieves light reflection via the element layer(s), thereby redirecting the incident light. An advantage of this embodiment is that the enhanced reflective properties of the LED filament can provide an even more attractive lighting effect.

[0022] According to one embodiment of the invention, the LED filament may further include an adhesive layer, wherein the adhesive layer is at least one of transparent and white reflective, wherein the element is attached to the elongated package via the adhesive layer. Thus, the adhesive layer is transparent and / or white reflective, wherein the element is attached to the elongated package via the adhesive layer. Preferably, the adhesive layer is a non-absorbing layer, i.e., less than 10% or even less than 5% of the light is absorbed. An advantage of this embodiment is that the adhesive layer provides convenience for securing or attaching the element to the elongated package. Another advantage of this embodiment is that the white reflectivity and / or transparency of the adhesive layer can preserve or even enhance the light distribution and / or aesthetic effect of the LED filament. The white reflective properties of the adhesive layer are particularly advantageous in providing a retro and / or decorative style for the LED filament.

[0023] According to one embodiment of the invention, the adhesive layer may comprise a polymer matrix, wherein a plurality of elements have a higher refractive index than the polymer matrix, and the plurality of elements are partially covered by the adhesive layer. It should be understood that the plurality of elements may protrude from the adhesive layer. The polymer matrix preferably comprises silicone. An advantage of this embodiment is that the higher refractive index of the plurality of elements (which may be at least 1.5, and preferably at least 1.65) results in improved optical performance of the LED filament compared to a polymer matrix having a refractive index of approximately 1.4.

[0024] According to one embodiment of the invention, the elongated package may include a light-emitting material configured to at least partially convert LED light emitted by a plurality of LEDs into converted light, wherein (i) the converted light and (ii) one of the converted light and the partially emitted LED light is white light having a correlated color temperature (CCT) in the range of 1700K-6500K and / or a color rendering index (CRI) of at least 80 or at least 85. An advantage of this embodiment is that the LED filaments can conveniently provide white light (both cool and warm white light) during operation.

[0025] According to one embodiment of the present invention, the thickness T of the LED filament F With the diameter D of the component E The relationship between them satisfies 0.05·T F ≤D E ≤0.5·T F Therefore, the diameter D of the component E It can be as small as the thickness T of an LED filament. F 1 / 20th of that, and as large as the thickness T of the LED filament. F Half of the original thickness. In this embodiment, the thickness T of the LED filament is... F It can be in the range of 1mm to 4mm. Furthermore, in the embodiment, the diameter D of the element... E It can be in the range of 100 micrometers to 1000 micrometers. An advantage of this embodiment is that the diameter D of the element... E Large enough yet small enough to achieve both light distribution properties and an aesthetically pleasing effect during the operation of the LED filament.

[0026] According to one embodiment of the invention, the plurality of elements may include transparent faceted particles, and each of the transparent faceted particles includes at least 7 facets, or at least 10 facets, or at least 15 facets. An advantage of this embodiment is that the relatively large number of facets can, and even further enhance, the refraction, dispersion, reflection, and / or diffraction of the converted and / or scattered light toward the LED filament light.

[0027] According to one embodiment of the invention, a plurality of elements include transparent faceted particles, wherein each faceted particle comprises at least two facets at a first portion of the faceted particle facing away from the elongated package, and at least two facets at a second portion of the faceted particle facing the elongated package. An advantage of this embodiment is that the refraction, dispersion, reflection, and / or diffraction of the converted and / or scattered light can be, and even additionally, increased, thus resulting in an even more aesthetically attractive lighting effect via the LED filament.

[0028] According to one embodiment of the invention, multiple elements can form a stack of at least two or at least three element layers. Therefore, the element layers can be arranged on top of each other on the LED filament. An advantage of this embodiment is that the LED filament thus provides a convenient and space-saving (slim) arrangement of multiple elements in the stack to achieve the effects of the invention. This includes situations where multiple elements only cover a portion of the package, and the filament may also have a portion comprising only one element layer or no element layer at all.

[0029] According to one embodiment of the invention, at least one of the following is satisfied: at least one of the plurality of elements has a thermal conductivity of at least 0.7 W / (m·K) (or at least 1 W / (m·K)); and the plurality of elements comprises at least one material selected from the group consisting of glass, sapphire, spinel, AlON (monocrystalline alumina), and quartz. Therefore, the plurality of elements have a thermal conductivity of at least 0.7 W / (m·K) (or at least 1 W / (m·K)), and / or the plurality of elements comprise glass, sapphire, spinel, AlON (monocrystalline alumina), and / or quartz. An advantage of this embodiment is that the thermal management of the LED filament during its operation is further improved, resulting in a longer operating life.

[0030] According to one embodiment of the invention, the elongated carrier is light-transmitting. Furthermore, the elongated encapsulation may at least partially (e.g., at least 80% or at least 90%) cover the second main surface of the elongated carrier, the second main surface being opposite the first main surface. An advantage of the light-transmitting nature of the carrier in this embodiment is that the aesthetic lighting effect and / or lighting distribution properties of the LED filament arrangement can be, and even further, enhanced. Because the carrier is light-transmitting, the elongated encapsulation covering the first and second main surfaces can further influence the LED light from a plurality of LEDs arranged on the first main surface.

[0031] According to one embodiment of the invention, multiple elements may cover at least 80%, at least 90%, or at least 95% of the elongated package (e.g., completely cover the elongated package). An advantage of this embodiment is that a relatively large portion of the elongated package is covered by multiple elements, thereby further enhancing the light distribution properties and aesthetic appeal during LED filament operation.

[0032] In embodiments, the elongated package may have a tubular shape and / or may be arranged entirely around the elongated carrier and the elongated package.

[0033] According to one embodiment of the present invention, an LED filament device is provided, configured to emit light from an LED filament device during operation. The LED filament device includes at least one LED filament according to any one of the preceding claims, wherein the plurality of LEDs comprises a plurality of LED subsets; and a controller coupled to the plurality of LED subsets, wherein the controller is configured to individually control the LED subsets to control the level of a flickering effect of the LED filament device light. By "controller," this refers herein to any unit, device, etc., substantially arranged or configured to control the LED subsets. An advantage of this embodiment is that the controller can conveniently and efficiently control the LED subsets individually during operation to achieve a flickering effect of the LED filament device light. The flickering effect can be achieved by directing the LED light and / or converted light onto multiple elements at different angles.

[0034] According to one embodiment of the present invention, an LED filament lamp is provided. The LED filament lamp includes at least one LED filament according to any one of the foregoing embodiments, or an LED filament assembly according to the foregoing embodiments. The filament lamp also includes a light-transmitting housing at least partially surrounding the LED filament and a base, wherein the base includes a connector arranged to mechanically and electrically connect the LED lamp to a luminaire socket. By the term "housing," it refers herein to the surrounding element (such as a lamp cap, cover, etc.), comprising at least partially translucent and / or transparent material. An advantage of this embodiment is that the LED filament (or LED filament assembly) according to the present invention can be conveniently arranged in virtually any luminaire, lamp, or lighting device, such as tubular lighting devices, LED filament lamps, or LED filament luminaires, luminaires, lighting systems, etc. The LED filament lamp may also include a driver for supplying power to the LED of the LED filament.

[0035] Further objectives, features, and advantages of the invention will become apparent upon studying the following detailed description, accompanying drawings, and appended claims. Those skilled in the art will recognize that different features of the invention can be combined to create embodiments other than those described below. Attached Figure Description

[0036] This and other aspects of the invention will now be described in more detail with reference to the accompanying drawings, which illustrate several embodiments of the invention.

[0037] Figure 1 An LED filament lamp according to the prior art is shown;

[0038] Figure 2 An LED filament according to an exemplary embodiment of the present invention is schematically shown;

[0039] Figure 3a and Figure 3b The elements of an LED filament according to an exemplary embodiment of the present invention are schematically shown;

[0040] Figure 4 An LED filament according to an exemplary embodiment of the present invention is schematically shown; and

[0041] Figure 5 An LED filament lamp according to an exemplary embodiment of the present invention is schematically shown. Detailed Implementation

[0042] Figure 1 An LED filament lamp 10 comprising multiple LED filaments 20 according to the prior art is shown. This type of LED filament lamp 10 is highly appreciated for its high decorative appeal and offers numerous advantages over incandescent lamps, such as longer operating life, lower power consumption, and increased efficiency related to the ratio of light energy to heat energy. This type of LED filament lamp 10 is capable of producing warm white light. However, there is interest in improving the properties of the light emitted from the LED filaments 20, and enhancing the appearance and / or decorative appeal of the LED filaments 20 and / or the LED filament lamp 10.

[0043] Figure 2An LED filament 100 according to an exemplary embodiment of the present invention is schematically shown. The LED filament 100 is configured to emit LED filament light 105. The LED filament 100 includes an elongated carrier 110 extending in a first direction A. The elongated carrier 110 includes a first main surface 112. The LED filament 100 includes an array of a plurality of LEDs 120 disposed on the first main surface 112, wherein the plurality of LEDs 120 are configured to emit LED light 125. The elongated carrier 110 may be an element, substrate, printed circuit board (PCB), etc., arranged to mechanically and / or electrically support the plurality of LEDs 120. Thus, the plurality of LEDs 120 may be arranged, mounted, and / or mechanically coupled to / to the first main surface 112 of the elongated carrier 110, wherein the elongated carrier 110 is configured to mechanically and / or electrically support the LEDs 120. The LED filament 100 also includes an elongated package 130. Encapsulation 130 at least partially surrounds, encapsulates, and / or surrounds a plurality of LEDs 120 and an elongated carrier 110. Encapsulation 130 includes a light-emitting material configured to at least partially convert LED light 125 emitted by the plurality of LEDs 120 into converted light and / or a light-scattering material configured to at least partially scatter the LED light 125 into scattered light. The thickness T of the LED filament 100 is... F It can be in the range of 1mm to 4mm.

[0044] The LED filament 100 also includes a plurality of elements 200 arranged on at least a portion of the elongated package 130. It should be noted that the distribution, size, form, etc., of the plurality of elements 200 are schematically indicated by way of example, and the plurality of elements 200 can have many different sizes and / or forms. The plurality of elements 200 includes transparent faceted particles (e.g., transparent faceted elements, beads, etc.) and / or transparent microlenses. By "microlens," it is used herein to refer to a relatively small lens arranged to optically influence light.

[0045] The term "transparent" in this application should be understood to mean that at least 70% (or preferably at least 85%) of the light emitted by the LED filament will be transmitted through the faceted particles and / or microlenses during the first pass. The term "substantially" also emphasizes this point.

[0046] Multiple elements 200 (i.e., transparent faceted particles and / or transparent microlenses) are arranged to at least partially refract, at least partially disperse, at least partially reflect, and at least partially diffract at least one of the converted light and the scattered light into at least one of the emitted LED filament light 105. Therefore, the transparent faceted particles and / or transparent microlenses of the multiple elements 200 are arranged to at least partially refract, at least partially disperse, at least partially reflect, and / or at least partially diffract the converted light and / or the scattered light into the emitted LED filament light 105. The multiple elements 200 may constitute at least one element layer, which may be arranged, for example, as a stacked layer, to at least partially cover the elongated package 130. Furthermore, when the multiple elements 200 are arranged in layers, these layers may constitute a retroreflector. The LED filament may also include an adhesive layer (not shown). The multiple elements 200 can thus be attached to the elongated package 130 via the adhesive layer, which may be transparent and / or white reflective. The adhesive layer is preferably a non-absorbing layer, i.e., less than 10% or even less than 5% of the light is absorbed. The adhesive layer may also comprise a polymer matrix (e.g., may include silicone) having a refractive index of approximately 1.4, while the plurality of elements 200 have a higher refractive index than the polymer matrix, such as at least 1.5 or at least 1.65. The plurality of elements 200, for example comprising glass, sapphire, spinel, AlON, and / or quartz, may also have a thermal conductivity of at least 0.7 W / (m·K).

[0047] Figure 3a An element 200 (in two dimensions) of an LED filament according to an exemplary embodiment of the present invention is schematically shown. For a better understanding of the elements(s) 200(s) and the characteristics and / or properties of the LED filament(s) including these elements(s) 200(s), reference is also made to... Figure 2 And associated text. It should be noted that the size, form, etc., of component 200 are... Figure 3a The element 200 is shown schematically as an example, and it can have many different sizes and / or forms. In other words, element 200 is illustrated as a star, but it can alternatively have diamond, pyramid, or other forms. Figure 3a In the middle, element 200 has the form of faceted particles. The thickness T of the LED filament F (exist Figure 2 (indicator) and the diameter D of element 200 E The relationship between them satisfies 0.05·T F ≤D E ≤0.5·T F Therefore, the diameter D of element 200 E It can be as small as the thickness T of an LED filament. F 1 / 20th of that, and as large as the thickness T of the LED filament. FHalf of it. For example, the thickness T of an LED filament. F It can be in the range of 1mm to 4mm, and / or the diameter D of element 200. E It can be in the range of 100 micrometers to 1000 micrometers.

[0048] According to the illustrated faceted particle form of the element 200, it may include at least seven facets 220 (i.e., relatively small flat surfaces). The element 200 may include at least two facets 220 at a first portion 300 of the elongated package opposite to the LED filament, and at least two facets at a second portion 310 of the elongated package facing the LED filament.

[0049] Figure 3b The element 200 of the LED filament of the present invention is schematically shown. Here, the element 200, in the form of a transparent faceted particle, has a diamond shape and has a base 400, a tip 410 opposite to the base 400, and a central portion 420 between the base 400 and the tip 410, wherein the diameter D of the central portion is... CS Larger than the diameter D of the base B .like Figure 3b As shown in the leftmost image, the LED filament element 200 can provide a dazzling light effect observed by the user / observer during the operation of the LED filament. The dazzling light effect is achieved by the LED filament as white light 450 enters from the top (base 400) of element 200, bounces around, and exits again through the top (base 400) of element 200. When the LED filament is moved by the user / observer, a flashing effect (which can also be described as (or referred to as) a flickering effect) is achieved by the flickering of light reflected from the surface of element 200. Figure 3b The rightmost image schematically illustrates the rainbow effect of element 200 via LED filament. The rainbow effect describes the rainbow colors 470 seen by the user / observer due to the dispersion of light, and occurs when light 450 enters element 200 at an angle, slows down, and disperses into different colors 470.

[0050] Figure 4 An LED filament 100 according to an exemplary embodiment of the present invention is schematically shown. It should be noted that, in Figure 4 The LED filament 100 shown has the same characteristics as... Figure 2 The LED filament 100 shown has the same features as the one described above, and reference is made here for a better understanding of the features, properties and / or functions of the LED filament 100. Figure 2 And associated text. Figure 4The LED filament 100 (schematically shown as being held in the palm of a hand) includes a plurality of elements 200 arranged on an elongated package 130 of the LED filament 100, wherein the plurality of elements 200 are arranged to at least partially refract, disperse, reflect and / or diffract the LED light emitted by the plurality of LEDs and converted and / or scattered by the package 300 into emitted LED filament light.

[0051] Figure 5 An LED filament lamp 600 is schematically illustrated. The LED filament lamp 600 includes at least one LED filament 100 according to any of the foregoing embodiments. It will be understood that, in Figure 5 The arrangement of the LED filaments 100 disclosed herein is merely exemplary, and the LED filament lamp 600 may include substantially any arrangement of one or more LED filaments 100. The LED filament lamp 600 also includes a light-transmitting housing 610 and a base 620, the light-transmitting housing 610 at least partially surrounding the LED filament(s) 100, wherein the base 620 includes a connector arranged to mechanically and electrically connect the LED lamp to a luminaire socket. The LED filament lamp 600 may also include a driver for supplying power to the LEDs of the LED filaments 100. Alternatively, the LED filament lamp 600 may include an LED filament device configured to emit light from the LED filament device in operation. The LED filament device may include at least one LED filament 100, wherein the plurality of LEDs of the LED filament(s) 100 comprise a plurality of LED subsets. The LED filament device may also include a controller coupled to the plurality of LED subsets, wherein the controller is configured to individually control the LED subsets to control the level of flickering effect of the light from the LED filament device.

[0052] Those skilled in the art will recognize that the present invention is by no means limited to the preferred embodiments described above. Rather, many modifications and variations are possible within the scope of the appended claims. For example, one or more of the LED filament 100, elongated carrier 110, LED 120, etc., may have different shapes, sizes, and / or dimensions than those depicted / described.

Claims

1. A light-emitting diode (LED) filament (100) configured to emit LED filament light (105) during operation, the LED filament comprising: The elongated carrier (110) includes a first main surface (112); An array of multiple LEDs (120) is arranged on the first main surface, wherein the multiple LEDs are configured to emit LED light (125). An elongated package (130) includes at least one of a light-emitting material and a light-scattering material, the light-emitting material being configured to at least partially convert LED light emitted by the plurality of LEDs into converted light, and the light-scattering material being configured to at least partially scatter the LED light into scattered light, wherein the elongated package at least partially covers the first main surface and at least partially surrounds the array of the plurality of LEDs; as well as Multiple elements (200) are arranged on at least a portion of the elongated package, wherein the multiple elements include at least one of the following: Essentially transparent faceted particles (210), and A basically transparent microlens (220). The plurality of elements are arranged to perform at least one of the following operations: at least partially refracting, at least partially dispersing, at least partially reflecting, and at least partially diffracting at least one of the converted light and the scattered light into the LED filament light, and The plurality of elements constitute a stack of at least two element layers.

2. The LED filament of claim 1, wherein the plurality of elements constitute at least one element layer, the at least one element layer being arranged to at least partially cover the at least portion of the elongated package.

3. The LED filament according to claim 2, wherein the at least one element layer constitutes a retroreflector.

4. The LED filament according to any one of the preceding claims further comprises an adhesive layer, wherein the adhesive layer is at least one of transparent and white reflective. The element is attached to the elongated package via the adhesive layer.

5. The LED filament according to claim 4, wherein... - The adhesive layer comprises a polymer matrix, wherein the plurality of elements have a higher refractive index than the polymer matrix, and - The plurality of elements are partially covered by the adhesive layer.

6. The LED filament according to any one of the preceding claims, wherein the elongated encapsulation comprises the light-emitting material, the light-emitting material being configured to at least partially convert the LED light emitted by the plurality of LEDs into converted light, and wherein one of the following is white light: (i) the converted light, and (ii) the converted light and part of the emitted LED light, The white light has a correlated color temperature (CCT) in the range of 1700K to 6500K and a color rendering index (CRI) of at least 80.

7. The LED filament according to any one of the preceding claims, wherein the thickness T of the LED filament is... F With respect to the diameter D of the element E The relationship between them satisfies 0.05·T F ≤D E ≤0.5·T F .

8. The LED filament according to any one of the preceding claims, wherein the plurality of elements comprises transparent faceted particles (210), and wherein each of the transparent faceted particles comprises at least 7 facets.

9. The LED filament according to any one of the preceding claims, wherein the plurality of elements comprises transparent faceted particles (210), and each faceted particle in the transparent faceted particles comprises: At least two facets at the location where the faceted particles are away from the first portion (300) of the elongated package; as well as At least two facets at the second portion (310) of the faceted particles facing the elongated package.

10. The LED filament according to any one of the preceding claims, wherein at least one of the following is satisfied: The plurality of elements have a thermal conductivity of at least 0.7 W / (m·K); and The plurality of elements include at least one material selected from the group consisting of glass, sapphire, spinel, AlON and quartz.

11. The LED filament device according to any one of the preceding claims, wherein... - The elongated carrier is transparent to light, and - The elongated package at least partially covers the second main surface of the elongated carrier, the second main surface being opposite to the first main surface.

12. The LED filament device according to any one of the preceding claims, wherein the plurality of elements cover at least 80% of the elongated package.

13. An LED filament device configured to emit LED filament device light (000) during operation, the LED filament device comprising: - At least one LED filament according to any one of the preceding claims, wherein the plurality of LEDs comprises a plurality of LED subsets; as well as - A controller coupled to the plurality of LED subsets, wherein the controller is configured to individually control the LED subsets for controlling the level of the flickering effect of the light from the LED filament assembly.

14. An LED filament lamp (600), comprising: At least one LED filament according to any one of claims 1 to 12 or the LED filament device according to claim 13; A light-transmitting housing (610) at least partially surrounds the LED filament; as well as Base (620), wherein the base includes a connector arranged to mechanically and electrically connect the LED lamp to a socket of the luminaire.

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