Classifications

• • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
  • F21—LIGHTING
  • F21S—NON-PORTABLE LIGHTING DEVICES; SYSTEMS THEREOF; VEHICLE LIGHTING DEVICES SPECIALLY ADAPTED FOR VEHICLE EXTERIORS
  • F21S4/00—Lighting devices or systems using a string or strip of light sources
  • F21S4/10—Lighting devices or systems using a string or strip of light sources with light sources attached to loose electric cables, e.g. Christmas tree lights
  • F21S4/15—Lighting devices or systems using a string or strip of light sources with light sources attached to loose electric cables, e.g. Christmas tree lights the cables forming a grid, net or web structure
• • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
  • F21—LIGHTING
  • F21K—NON-ELECTRIC LIGHT SOURCES USING LUMINESCENCE; LIGHT SOURCES USING ELECTROCHEMILUMINESCENCE; LIGHT SOURCES USING CHARGES OF COMBUSTIBLE MATERIAL; LIGHT SOURCES USING SEMICONDUCTOR DEVICES AS LIGHT-GENERATING ELEMENTS; LIGHT SOURCES NOT OTHERWISE PROVIDED FOR
  • F21K9/00—Light sources using semiconductor devices as light-generating elements, e.g. using light-emitting diodes [LED] or lasers
  • F21K9/20—Light sources comprising attachment means
  • F21K9/23—Retrofit light sources for lighting devices with a single fitting for each light source, e.g. for substitution of incandescent lamps with bayonet or threaded fittings
  • F21K9/232—Retrofit light sources for lighting devices with a single fitting for each light source, e.g. for substitution of incandescent lamps with bayonet or threaded fittings specially adapted for generating an essentially omnidirectional light distribution, e.g. with a glass bulb
• • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
  • F21—LIGHTING
  • F21S—NON-PORTABLE LIGHTING DEVICES; SYSTEMS THEREOF; VEHICLE LIGHTING DEVICES SPECIALLY ADAPTED FOR VEHICLE EXTERIORS
  • F21S4/00—Lighting devices or systems using a string or strip of light sources
  • F21S4/20—Lighting devices or systems using a string or strip of light sources with light sources held by or within elongate supports
  • F21S4/22—Lighting devices or systems using a string or strip of light sources with light sources held by or within elongate supports flexible or deformable, e.g. into a curved shape
  • F21S4/24—Lighting devices or systems using a string or strip of light sources with light sources held by or within elongate supports flexible or deformable, e.g. into a curved shape of ribbon or tape form, e.g. LED tapes
• • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
  • F21—LIGHTING
  • F21V—FUNCTIONAL FEATURES OR DETAILS OF LIGHTING DEVICES OR SYSTEMS THEREOF; STRUCTURAL COMBINATIONS OF LIGHTING DEVICES WITH OTHER ARTICLES, NOT OTHERWISE PROVIDED FOR
  • F21V1/00—Shades for light sources, i.e. lampshades for table, floor, wall or ceiling lamps
  • F21V1/14—Covers for frames; Frameless shades
  • F21V1/16—Covers for frames; Frameless shades characterised by the material
  • F21V1/17—Covers for frames; Frameless shades characterised by the material the material comprising photoluminescent substances
• • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
  • F21—LIGHTING
  • F21V—FUNCTIONAL FEATURES OR DETAILS OF LIGHTING DEVICES OR SYSTEMS THEREOF; STRUCTURAL COMBINATIONS OF LIGHTING DEVICES WITH OTHER ARTICLES, NOT OTHERWISE PROVIDED FOR
  • F21V9/00—Elements for modifying spectral properties, polarisation or intensity of the light emitted, e.g. filters
  • F21V9/30—Elements containing photoluminescent material distinct from or spaced from the light source
• • H—ELECTRICITY
  • H10—SEMICONDUCTOR DEVICES; ELECTRIC SOLID-STATE DEVICES NOT OTHERWISE PROVIDED FOR
  • H10W—GENERIC PACKAGES, INTERCONNECTIONS, CONNECTORS OR OTHER CONSTRUCTIONAL DETAILS OF DEVICES COVERED BY CLASS H10
  • H10W90/00—Package configurations
• • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
  • F21—LIGHTING
  • F21V—FUNCTIONAL FEATURES OR DETAILS OF LIGHTING DEVICES OR SYSTEMS THEREOF; STRUCTURAL COMBINATIONS OF LIGHTING DEVICES WITH OTHER ARTICLES, NOT OTHERWISE PROVIDED FOR
  • F21V33/00—Structural combinations of lighting devices with other articles, not otherwise provided for
  • F21V33/0004—Personal or domestic articles
  • F21V33/0008—Clothing or clothing accessories, e.g. scarfs, gloves or belts
• • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
  • F21—LIGHTING
  • F21Y—INDEXING SCHEME ASSOCIATED WITH SUBCLASSES F21K, F21L, F21S and F21V, RELATING TO THE FORM OR THE KIND OF THE LIGHT SOURCES OR OF THE COLOUR OF THE LIGHT EMITTED
  • F21Y2103/00—Elongate light sources, e.g. fluorescent tubes
  • F21Y2103/30—Elongate light sources, e.g. fluorescent tubes curved
• • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
  • F21—LIGHTING
  • F21Y—INDEXING SCHEME ASSOCIATED WITH SUBCLASSES F21K, F21L, F21S and F21V, RELATING TO THE FORM OR THE KIND OF THE LIGHT SOURCES OR OF THE COLOUR OF THE LIGHT EMITTED
  • F21Y2105/00—Planar light sources
  • F21Y2105/10—Planar light sources comprising a two-dimensional [2D] array of point-like light-generating elements
  • F21Y2105/14—Planar light sources comprising a two-dimensional [2D] array of point-like light-generating elements characterised by the overall shape of the two-dimensional [2D] array
  • F21Y2105/16—Planar light sources comprising a two-dimensional [2D] array of point-like light-generating elements characterised by the overall shape of the two-dimensional [2D] array square or rectangular, e.g. for light panels
• • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
  • F21—LIGHTING
  • F21Y—INDEXING SCHEME ASSOCIATED WITH SUBCLASSES F21K, F21L, F21S and F21V, RELATING TO THE FORM OR THE KIND OF THE LIGHT SOURCES OR OF THE COLOUR OF THE LIGHT EMITTED
  • F21Y2107/00—Light sources with three-dimensionally disposed light-generating elements
  • F21Y2107/70—Light sources with three-dimensionally disposed light-generating elements on flexible or deformable supports or substrates, e.g. for changing the light source into a desired form
• • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
  • F21—LIGHTING
  • F21Y—INDEXING SCHEME ASSOCIATED WITH SUBCLASSES F21K, F21L, F21S and F21V, RELATING TO THE FORM OR THE KIND OF THE LIGHT SOURCES OR OF THE COLOUR OF THE LIGHT EMITTED
  • F21Y2115/00—Light-generating elements of semiconductor light sources
  • F21Y2115/10—Light-emitting diodes [LED]

Definitions

• the present invention relates to a light emitting device comprising at least one LED filament comprising a flexible substrate and a plurality of LED light sources arranged on the flexible substrate, and an encapsulation encapsulating the plurality of LED light sources and at least one side of the flexible substrate.
• the word“knot” is in the broadest sense intended to mean and encompass any intentional complication in cordage which may be useful or decorative, including especially knots and hitches, and also weavings, but notably excluding braids. More particularly, the word“knot” as used herein is intended to mean a complication in cordage in the form of a fastening made by looping a piece of string, rope, or something similar, according to the invention particularly a flexible LED filament, on itself or together with another piece of string, rope, or something similar, according to the invention particularly a further flexible LED filament or other filament, and tightening it. Further reference is made to https://www.britannica.com/technoloev/knot-cording. where it is stated that“In the narrow sense of the term, a knot is a knob made on a rope by turning the rope in on itself through a loop”
• Fig. 1 illustrates non-limiting examples of knots and hitches
• Fig. 6 shows an example of a weaving.
• the term“weaving” is intended to refer more specifically to a complication in cordage in which two distinct sets of yarns or threads, according to the invention particularly flexible LED filaments, are interlaced at right angles to one another.
• Incandescent lamps are rapidly being replaced by LED based lighting solutions. It is nevertheless still appreciated and desired by users to have retrofit lamps which have the look of an incandescent bulb. For this purpose, one can simply make use of the infrastructure for producing incandescent lamps based on glass and replace the filament with LEDs emitting white light.
• One of the concepts is based on LED filaments placed in such a bulb. The appearances of these lamps are highly appreciated as they look highly decorative. There is consequently a very big market for this type of LED filament lamp.
• CN 201032092 Y shows an example of such a LED based lamp, in which a plurality of LED filaments is provided in a loose flat plaid-like structure in which the filaments twist around each other.
• the LED filaments are in this solution not connected or in contact with one another, nor no they have a satisfactory spatial light distribution.
• LED filament with a pleasant appearance. It is further desired to improve the spatial light distribution of LED filaments. It is further desired to (locally) improve the brightness of LED filaments (e.g. for beam shaping or shadowing purposes in a luminaire). It is further desired to easily combine and/or connect different filaments with one another.
• a LED filament is understood to provide LED filament light and comprises a plurality of light emitting diodes (LEDs) arranged in a linear array.
• the LED filament has a length L and a width W, wherein L>5W.
• the LED filament may be arranged in a straight configuration or in a non straight configuration such as for example a curved configuration, a 2D/3D spiral or a helix.
• the LEDs are arranged on an elongated carrier like for instance a substrate, that may be rigid (made from e.g. a polymer, glass, quartz, metal or sapphire) or flexible (e.g. made of a polymer or metal e.g. a film or foil).
• the carrier comprises a first major surface and an opposite second major surface
• the LEDs are arranged on at least one of these surfaces.
• the carrier may be reflective or light transmissive, such as translucent and preferably transparent.
• the LED filament may comprise an encapsulant at least partly covering at least part of the plurality of LEDs.
• the encapsulant may also at least partly cover at least one of the first major or second major surface.
• the encapsulant may be a polymer material which may be flexible such as for example a silicone. Further, the LEDs may be arranged for emitting LED light e.g. of different colors or spectrums.
• the encapsulant may comprise a luminescent material that is configured to at least partly convert LED light into converted light.
• the luminescent material may be a phosphor such as an inorganic phosphor and/or quantum dots or rods.
• the LED filament may comprise multiple sub-filaments.
• a light emitting device comprising a number of LED filaments, each filament comprising a flexible substrate and a plurality of LED light sources arranged on the flexible substrate, and an encapsulation encapsulating the plurality of LED light sources and at least a part of one side of the flexible substrate, where the at least one LED filament of said number of LED filaments comprises at least one knot in the form of intentional complication in cordage of the at least one LED filament, and where the intentional complication in cordage is any one of a fastening made by looping the at least one LED filament on itself or together with a further LED filament of the number of filaments and tightening it, and an intentional complication in cordage in which the at least one LED filament is interlaced with at least one further LED filament at right angles to one another.
• the at least one LED filament comprises at least one knot in the form of intentional complication in cordage of the at least one LED filament, where the intentional complication in cordage is any one of a fastening made by looping the at least one LED filament on itself or together with a further LED filament and tightening it, and an intentional complication in cordage in which the at least one LED filament is interlaced with at least one further LED filament at right angles to one another, a light emitting device with one or more LED filaments with a pleasant appearance and with improved spatial light distribution and/or at least locally improved brightness of LED filaments is provided for.
• the flexibility of the LED filament is improved and the risk of the LED filament breaking or cracking when being bent to be tied to a knot is reduced. This in turn makes it easier to provide the LED filament with the knot.
• the further LED filament may also comprise a flexible substrate and a plurality of LED light sources arranged on the flexible substrate, and an encapsulation encapsulating the plurality of LED light sources and at least a part of one side of the flexible substrate.
• the light emitting device comprises a plurality of LED filaments, where the plurality of LED filaments comprises at least one knot in the form of intentional complication in cordage of one or two LED filaments of the plurality of LED filaments and where the intentional complication in cordage is any one of a fastening made by looping one LED filament of the plurality of LED filaments on itself or together with a further LED filament of the plurality of LED filaments and tightening it, and an intentional complication in cordage in which at least one LED filament of the plurality of LED filaments is interlaced with at least one further LED filament of the plurality of LED filaments at right angles to one another.
• a light emitting device is thereby provided with which it is particularly easy to combine and/or connect different filaments with one another.
• knot is provided as a weaving
• decorative light emitting surfaces based on flexible LED filaments.
• Such light emitting surfaces can be flat or curved and arranged into a decorative lighting fixture.
• the at least one LED filament, or the one or two LED filaments of the plurality of LED filaments comprise more than one knot.
• a light emitting device which has a greater versatility in terms of appearance of the LED filaments as seen by an observer.
• At least two of the plurality of LED filaments are connected to one another or tied together by the at least one knot.
• a light emitting device is provided with which it is not only particularly easy to combine and/or connect different filaments with one another, but which also has a very robust LED filament structure.
• the at least one LED filament comprises at least one point of contact with itself within the at least one knot, or wherein at least two of the plurality of LED filaments comprise at least one point of mutual contact within the at least one knot. It is noted that providing more than one knot, e.g. 2, 3 or 4 knots, are also possible. Thereby, a light emitting device is provided with which it is not only particularly easy to combine and/or connect different filaments with one another, but which also has a particularly robust LED filament structure, even for embodiments comprising only one LED filament. Further, when providing more knots, an even more robust LED filament structure is provided for.
• the at least one knot is chosen from the group comprising an overhand knot, a double overhand knot, a figure 8 knot, a granny knot, a square knot, a woven knot and combinations thereof.
• each LED filament of the plurality of LED filaments is adapted for, in operation, emitting light of the same color temperature.
• At least one LED filament of the plurality of LED filaments is adapted for, in operation, emitting light of a different color than that of the other LED filaments of the plurality of LED filaments.
• a light emitting device which has a greater versatility in terms of color appearance of the LED filaments as seen by an observer.
• the at least one LED filament comprises a reflective material, a luminescent material or a combination of a reflective material and a luminescent material.
• Reflective materials have the advantage of enabling producing points emitting light in different directions, and thereby of providing the light emitting device with a greater uniformity in brightness irrespective of the angle of view.
• Luminescent materials have the advantage of enabling the production of colorful textures which in the far field lead to high quality light.
• the concentration of the luminescent material varies along a longitudinal extension of the at least one LED filament and/or between LED filaments.
• the light emitting device further comprises at least one luminescent filament.
• the luminescent filament may or may not comprise LEDs.
• the light emitting device further comprises at least one light guiding filament.
• the light guiding filament may or may not comprise LEDs.
• the luminescent filament may also form part of the at least one knot.
• a thickness of the encapsulation varies along a longitudinal extension of the at least one LED filament and/or between LED filaments.
• This provides for enabling varying flexibility along the LED filament, such as to, for instance, improve the flexibility of the LED filament more in the area where a knot is to be formed as compared to other areas. This in turn may provide for a saving of encapsulation material.
• the encapsulation encapsulates the flexible substrate on both sides.
• the encapsulation is made of a polymer material, such as a silicone.
• the encapsulation comprises a luminescent material, such as e.g. a green, yellow and/or red phosphor.
• the encapsulation comprises a scattering material, such as e.g. BaSCL, AI 2 O 3 , and/or TiCh particles.
• a luminescent material converts LED light into converted LED light.
• the LED filament provides LED filament light.
• the LED filament light comprises LED light and/or converted light.
• the flexible substrate is light transmissive.
• the flexible substrate may also be semi -reflective e.g. scattering or transparent.
• the light emitting device further comprises a controller configured to control the at least one LED filament or to individually control at least two LED filament of the plurality of LED filaments.
• a controller configured to control the at least one LED filament or to individually control at least two LED filament of the plurality of LED filaments.
• the invention furthermore, in a second aspect, concerns a lamp, a luminaire, or a lighting fixture, or a shade for a lamp, a luminaire or a lighting fixture, comprising a light emitting device according to the invention.
• Such a lamp, a luminaire or a lighting fixture may be a lamp, a luminaire or a lighting fixture, for instance a spot module, for retail or shop illumination, for architectural lighting or for outdoor lighting purposes.
• Fig. 1 illustrates non-limiting examples of knots and hitches, which may be provided on one two (or in principle more) LED filaments of a light emitting device according to the invention.
• Fig. 2 shows a schematic view of a light bulb with a light emitting device according to the invention.
• Fig. 3 shows a top view of a first embodiment of a light emitting device according to the invention with two LED filaments and a knot.
• Fig. 4 shows a top view of a second embodiment of a light emitting device according to the invention with two LED filaments and a knot.
• Fig. 5 shows a schematic cross sectional view of a LED filament of a light emitting device according to the invention.
• Fig. 6 shows a top view of a light emitting device according to the invention with three LED filaments and two knots.
• Fig. 7 shows a cross sectional side view of a light emitting device according to the invention with a plurality of LED filaments arranged in a woven configuration.
• Fig. 8 shows a top view of the light emitting device according to Fig. 5.
• Fig. 9 shows a cross sectional side view of a light emitting device according to the invention where the LED filament comprises a reflective material.
• Fig. 10 shows a cross sectional side view of a light emitting device according to the invention and further comprising a luminescent filament.
• Fig. 2 shows a schematic view of a light bulb 100 with a light emitting device 1 according to the invention.
• the light bulb comprises a socket 9 with a terminal 10 for electrical connection to a power source and a glass bulb 11 with a cavity 12 filled with a suitable gas, particularly an inert gas.
• the light emitting device 1 generally and irrespective of the embodiment comprises at least one LED filament 2.
• the light emitting device 1 comprises one LED filament 2.
• two LED filaments 20 and 21 are provided.
• the at least one LED filament 2 is connected to an optional controller 8.
• the controller 8 is configured to control the at least one LED filament 2, and may in other embodiments be configured to individually control each of the two LED filaments 21 and 22.
• the controller 8 may be configured to individually control the color, color temperature, intensity or the like of the light emitted by the at least one LED filament 2, or by the two or more LED filaments 20, 21.
• the at least one LED filament 2 comprises a plurality of LEDs 4 (cf. e.g. Figs. 4 and 8) arranged along the longitudinal extension of the LED filament 2.
• the LEDs 4 may be arranged with regular spacing or with irregular spacing or a combination thereof.
• the LEDs 4, and thus the LED filaments 2, 20, 21, 22, may be configured to emit light of any feasible and desired color temperature.
• the two LED filaments are adapted for, in operation, emitting light of the same color temperature.
• the two LED filaments are adapted for, in operation, emitting light of mutually different color temperatures.
• the plurality of LEDs 4 may further be arranged on one or both surfaces of the flexible substrate 3.
• the LEDs 4 may be colored LEDs e.g. red, green, and/or blue LEDs.
• the LEDs 4 may also be UV and/or blue LEDs.
• the LED filament 2 may have more than 20 LEDs, more than 40 LEDs, or even more than 50 LEDs.
• the LEDs 4 may be arranged in a linear manner.
• the flexible substrate 3 may be transparent or light transmissive.
• the lighting device and/or the LED filaments may provide white light.
• the white light may be within 10 SDCM from the BBL, within 8 SDCM, or within 5 SDCM.
• the color temperature of the white light may be in the range from 2000 K to 6000 K, in the range from 2100 K to 5000 K, or in the range from 2200 K to 4000 K, such as for example 2700 K or 3000 K.
• the color rendering index of the white light may be at least 80, at least 85, or at least 88 such as for example 90.
• the at least one LED filament 2 comprises at least one knot 6.
• one knot 6 is provided.
• the knot 6 may be provided at any location on the at least one filament, such as but not limited to at the top of the envelope or at the center of the envelope.
• the at least one knot 6 may comprise any one or more of the following knot components.
• a bight being any curved section, slack part or loop between the ends of a LED filament.
• a bitter end being an end of a LED filament that is tied off.
• a loop being a curve narrower than a bight but with separate ends.
• An elbow being two crossing points created by an extra twist in a loop or a circle of a LED filament.
• a turn or a single turn being a curve with crossed legs.
• One or more round turns a round turn being a complete encirclement of an imaginary or real object.
• the LED filament 2 provided with the knot 6 may comprise one or more of the following.
• a standing end being the longer end of the LED filament 2 not involved in the knot 6.
• a standing part being a section of the LED filament 2 between the knot 6 and a standing end.
• a working end being the end of the LED filament 2 used in making the knot.
• Fig. 3 shows an exemplary knot 6 of a light emitting device according to the invention in further detail.
• the knot 6 is in this case a square knot.
• Fig. 3 illustrates an embodiment in which the two LED filaments 20, 21 are adapted for, in operation, emitting light of different color temperatures.
• Fig. 1 shows further examples of various non-limiting embodiments of knots 6 according to the invention.
• the knot 6 according to the invention may for instance belong to the category of hitches, bends, splices or knots of the category serving as a stopper or knob at the end of a strand to keep that end of the strand from slipping through a grommet or eye. More specifically, the knot 6 according to the invention may be provided with the structure of any one of a bend, a binding, a coil knot, a decorative knot, a hitch, a lashing, a loop, a slip knot, a slipped knot, a seizing, a splice, a stopper and a whipping.
• the knot 6 according to the invention may for instance be an overhand knot, a double overhand knot, a figure 8 knot, a granny knot, a square knot and a woven knot. Combinations of such knots and/or categories of knots, as well as other specific types of knots, are also feasible.
• a further embodiment of a knot 6 of a light emitting device is shown.
• the knot 6 is in the form of a square knot with extra passes.
• two LED filaments 20 and 21 are provided.
• the LED filaments 20 and 21 comprise a plurality of LEDs 41-46.
• the LED filaments 20 and 21 also comprise a plurality of points 7 of mutual contact within the knot 6.
• the LEDs and the points of mutual contact may be coincident, such as would be the case for instance at LEDs 42 and 46.
• the LEDs may be arranged between point of mutual contact such as would be the case for instance at LEDs 43 and 45.
• the knot 6 may be tightened or slacked according to need and desire. Obviously, if the knot 6 is tightened - or slacked - the points 7 of mutual contact within the knot 6 will shift, and so will the position of the LEDs 41-46 with respect to the points 7 of mutual contact within the knot 6.
• Fig. 5 shows a cross-sectional view of an exemplary LED filament 2 according to the invention.
• the LED filament 2 comprises a flexible substrate 3, an LED 4 and an encapsulation 5a, 5b.
• the encapsulation 5a, 5b encapsulates at least the LED 4 and a part of the flexible substrate 3.
• the encapsulation 5a, 5b may encapsulate the flexible substrate 3 on one side or on both sides. In other words, the encapsulation part 5b shown on Fig. 5 is optional.
• the encapsulation 5a, 5b may vary in thickness along the length of the LED filament 2.
• the encapsulation 5a, 5b may also comprise scattering elements, such as e.g. AI2O3, BaSCE and/or T1O2 particles, or a scattering material, such as e.g. AI2O3, BaSCE and/or T1O2. Additionally, or alternatively, the encapsulation 5a, 5b may comprise a luminescent material.
• the luminescent material may comprise a phosphor.
• the phosphor may be configured to partly or fully convert LED light into converted LED light.
• the LED light and/or converted LED light forms the light output of the LED filament 2.
• Fig. 6 shows a further embodiment of LED filaments with knots of a light emitting device according to the invention. In this embodiment, three LED filaments 20, 21 and 22 are provided.
• the three LED filaments 20, 21 and 22 are provided with two knots 61 and 62.
• the two knots 61 and 62 are of the same type. Of course, more than two knots may also be provided. Also, the two or more knot
• Figs. 7 and 8 shows a further embodiment of LED filaments with knots of a light emitting device according to the invention in a cross sectional side view and a top view, respectively.
• a plurality of LED filaments 20 and 21 are provided and are arranged in a woven pattern, in which the LED filaments 20 and 21 extend perpendicular to one another.
• the LED filaments 20 form warps, while the LED filaments 21 form wefts - or vice versa.
• LEDs 41, 42 are provided on the LED filaments 20, 21. Points 7 of mutual contact between the woven LED filaments 20, 21 are illustrated in Fig. 7.
• a light emitting device with a decorative light emitting surface based on flexible LED filaments.
• Such surfaces can be flat or curved and arranged into a decorative lighting fixture.
• the thus woven LED filament structure may be arranged in the shape of a cylinder or a chimney or a cone or a frustum of a cone.
• the light emitting device according to the invention may even be applied as or on a lamp shade.
• Figs. 9 and 10 show cross sectional side views of two further embodiment of LED filaments in a woven pattern.
• the LEDs 41 and 42 are arranged such that light is emitted in one direction by the LEDs 41 and in another, opposite, direction by the LEDs 42. Furthermore, the LED filaments 20 and 22 are supplemented with an additional LED filament 21 comprising a reflective material.
• an additional filament or strand comprising a reflective material may be provided.
• reflective points may be provided for emission of light in different directions.
• one (or both) of the LED filaments 20 and 22 may comprise a reflective material.
• any additional filament or strand with a reflective material may be omitted. Reflection or scattering may also be obtained by using materials with differences in refractive indices, such as e.g. particles of glass in silicone.
• the LEDs 41 and 42 are arranged such that light is emitted in one direction by the LEDs 41 and in another, opposite, direction by the LEDs 42. Furthermore, the LED filaments 20 and 21 are supplemented with an additional filament or strand 13 comprising a luminescent material. In this way colorful textures may be produced.
• one (or both) of the LED filaments 20 and 21 may comprise a luminescent material.
• the additional filament or strand 13 may be omitted.
• an additional filament 13 comprising a combination of a reflective material and a luminescent material may be provided, or one (or both) of the LED filaments 20 and 21 may comprise a combination of a reflective material and a luminescent material.

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• Engineering & Computer Science (AREA)
• General Engineering & Computer Science (AREA)
• Physics & Mathematics (AREA)
• Microelectronics & Electronic Packaging (AREA)
• Optics & Photonics (AREA)
• Spectroscopy & Molecular Physics (AREA)
• Non-Portable Lighting Devices Or Systems Thereof (AREA)
• Fastening Of Light Sources Or Lamp Holders (AREA)
• Led Device Packages (AREA)

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• 2020
  • 2020-07-15 US US17/628,450 patent/US11808417B2/en active Active
  • 2020-07-15 CN CN202080052893.8A patent/CN114174713B/zh active Active
  • 2020-07-15 JP JP2022501151A patent/JP7575855B2/ja active Active
  • 2020-07-15 WO PCT/EP2020/070041 patent/WO2021013656A1/en not_active Ceased
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