# US 12,222,074 B2 · Light emitting diode filament > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 12,222,074 B2 - Document ID: US12222074B2 - Status: Granted - Kind: B2 - Application number: 18/559,085 - Filed: 2022-04-28 - Published: 2024-07-11 - Granted: 2025-02-11 - Earliest claimed: 2021-05-07 - Assignees: Signify Holding B.V. - Applicants: Signify Holding B.V. - Inventors: Grigory Alexandrovich Onushkin; Aldegonda Lucia Weijers; Jan De Graaf - Web page: https://patentgrep.com/patent/US12222074B2 ## CPC - F21K 9/232: specially adapted for generating an essentially omnidirectional light distribution, e.g. with a glass bulb - F21K 9/237: Details of housings or cases, i.e. the parts between the light-generating element and the bases; Arrangement of components within housings or cases (F21K9/238 takes precedence) - F21K 9/68: Details of reflectors forming part of the light source - F21K 9/90: Methods of manufacture - F21Y 2103/10: comprising a linear array of point-like light-generating elements - F21Y 2105/16: square or rectangular, e.g. for light panels - F21Y 2113/30: {of visible and non-visible spectrum} - F21Y 2115/10: Light-emitting diodes [LED] - 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 - 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 ## Abstract The present invention relates to an LED filament (10), comprising: a first LED filament portion (12a) comprising a plurality of first LEDs (14a) adapted to emit first LED filament light: a second LED filament portion (12b) parallel to the first LED filament portion (12a) and comprising a plurality of second LEDs (14b) adapted to emit second LED filament light: and at least one light-blocking wall (26) arranged between the first and second LED filament portions to reduce or prevent optical cross-talk between the first and second LEDs. ## Claims ### Claim 1 An LED filament, comprising: a first LED filament portion comprising a plurality of first LEDs adapted to emit first LED filament light; a second LED filament portion parallel to the first LED filament portion and comprising a plurality of second LEDs adapted to emit second LED filament light; and at least one light-blocking wall arranged between the first LED filament portion and the second LED filament portion to reduce or prevent optical cross-talk between the first LEDs of the first LED filament portion and the second LEDs of the second LED filament portion, said at least one light-blocking wall being adapted to block LED filament light of a first color but not block LED filament light of at least a second color different than the first color, wherein the first LED filament portion comprises a first elongated carrier, wherein the second LED filament portion comprises a second elongated carrier, wherein the first elongated carrier is mechanically connected to the second elongated carrier by at least one non-transparent layer, and wherein said at least one light-blocking wall is formed by said at least one non-transparent layer. ### Claim 2 (depends on 1) An LED filament according to claim 1, wherein the plurality of first LEDs are arranged on a surface of the first LED filament portion, wherein the plurality of second LEDs are arranged on a corresponding surface of the second LED filament portion such that the first LEDs are aimed in substantially the same direction(s) as the second LEDs, and wherein the at least one light-blocking wall raises above said surface of the first LED filament portion and the corresponding surface of the second LED filament portion. ### Claim 3 (depends on 1) An LED filament according to claim 1, wherein the at least one light-blocking wall has a height (h) that exceeds the height of the first and second LEDs including any encapsulation thereof. ### Claim 4 (depends on 1) An LED filament according to claim 1, wherein said at least one non-transparent layer is bent along a boundary between the first LEDs and the second LEDs to form said at least one light-blocking wall. ### Claim 5 (depends on 1) An LED filament according to claim 1, wherein said at least one non-transparent layer is bent such that the at least one light-blocking wall is at least one fin-type light-blocking wall. ### Claim 6 (depends on 1) An LED filament according to claim 1, wherein the at least one light-blocking wall is segmented into wall segments along the length of the LED filament, wherein the wall segments are situated at the locations of the first and second LEDs along the LED filament, and wherein gaps with reduced or no wall height are situated at locations along the LED filament where no first or second LEDs are present. ### Claim 7 (depends on 6) An LED filament according to claim 6, segmentally bent along the length of the LED filament by bending at said gaps. ### Claim 8 (depends on 6) An LED filament according to claim 6, wherein each wall segment has an isosceles trapezoid side view profile with a wider base than top. ### Claim 9 (depends on 1) An LED filament according to claim 1, wherein the first LEDs are white LEDs for emitting white first LED filament light, and wherein the second LEDs are RGB LEDs for emitting colored second LED filament light. ### Claim 10 (depends on 1) An LED filament according to claim 1, further comprising: a third LED filament portion parallel to the second LED filament portion and comprising a plurality of third LEDs adapted to emit third LED filament light; and at least one further light-blocking wall arranged between the second LED filament portion and the third LED filament portion to reduce or prevent optical cross-talk between the second and third LEDs. ### Claim 11 (depends on 10) An LED filament according to claim 10, wherein the third LEDs are white LEDs for emitting white third LED filament light of a different color temperature than the white first LED filament light. ### Claim 12 (depends on 1) An LED filament lamp, comprising: at least one LED filament according to claim 1; a light transmissive envelope at least partly surrounding said at least one LED filament arrangement; and a connector for electrically and mechanically connecting the LED filament lamp to a socket. ### Claim 13 A method of manufacturing an LED filament, wherein the method comprises: providing a first LED filament portion comprising a first elongated carrier and a plurality of first LEDs adapted to emit first LED filament light; providing a second LED filament portion parallel to the first LED filament portion and comprising a second elongated carrier and a plurality of second LEDs adapted to emit second LED filament light, wherein the first elongated carrier is mechanically connected to the second elongated carrier by at least one substantially flat layer with excessive distance between the first and second elongated carriers; and bending the at least one substantially flat layer to form at least one light-blocking wall between the first LED filament portion and the second LED filament portion, said at least one light-blocking wall being adapted to block LED filament light of a first color but not block LED filament light of at least a second color different than the first color, whereby said excessive distance is reduced to a selected distance between the first and second elongated carriers.