US 12,222,074 B2
Light emitting diode filament
Grigory Alexandrovich Onushkin, Eindhoven (NL); Aldegonda Lucia Weijers, Eindhoven (NL); and Jan De Graaf, Uden (NL)
Assigned to SIGNIFY HOLDING B.V., Eindhoven (NL)
Appl. No. 18/559,085
Filed by SIGNIFY HOLDING B.V., Eindhoven (NL)
PCT Filed Apr. 28, 2022, PCT No. PCT/EP2022/061399
§ 371(c)(1), (2) Date Nov. 6, 2023,
PCT Pub. No. WO2022/233715, PCT Pub. Date Nov. 10, 2022.
Claims priority of application No. 21172834 (EP), filed on May 7, 2021.
Prior Publication US 2024/0230037 A1, Jul. 11, 2024
Int. Cl. F21K 9/232 (2016.01); F21K 9/237 (2016.01); F21K 9/90 (2016.01); F21Y 103/10 (2016.01); F21Y 115/10 (2016.01)
CPC F21K 9/232 (2016.08) [F21K 9/237 (2016.08); F21K 9/90 (2013.01); F21Y 2103/10 (2016.08); F21Y 2115/10 (2016.08)] 13 Claims
OG exemplary drawing
 
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.