US 11,808,412 B2
Color controllable LED filament and lamp with such a filament
Ties Van Bommel, Horst (NL); and Rifat Ata Mustafa Hikmet, Eindhoven (NL)
Assigned to SIGNIFY HOLDING B.V., Eindhoven (NL)
Appl. No. 17/630,343
Filed by SIGNIFY HOLDING B.V., Eindhoven (NL)
PCT Filed Jul. 20, 2020, PCT No. PCT/EP2020/070404
§ 371(c)(1), (2) Date Jan. 26, 2022,
PCT Pub. No. WO2021/018646, PCT Pub. Date Feb. 4, 2021.
Claims priority of application No. 19189014 (EP), filed on Jul. 30, 2019.
Prior Publication US 2022/0290820 A1, Sep. 15, 2022
Int. Cl. F21K 9/232 (2016.01); F21Y 113/17 (2016.01); F21Y 103/10 (2016.01); F21Y 115/10 (2016.01)
CPC F21K 9/232 (2016.08) [F21Y 2103/10 (2016.08); F21Y 2113/17 (2016.08); F21Y 2115/10 (2016.08)] 14 Claims
OG exemplary drawing
 
1. A LED filament including a linear array of LEDs arranged on a carrier substrate, wherein:
the linear array is divided into two separate longitudinal sections, a first longitudinal section including only LEDs configured to emit white light with a color temperature, and a second longitudinal section including only color controllable LEDs configured to emit color controllable light, said color controllable LEDs comprise LED groups each including a red LED, a green LED and a blue LED, within each group the LEDs are arranged non-linearly, e.g. in a triangle fashion, and
wherein LEDs in each groups are separated by a first, intra-group distance, and wherein groups are separated by a second, inter-group distance, wherein said inter-group distance is greater than said intra-group distance; and
wherein the two longitudinal sections are separated by a distance to enable a bend between the two longitudinal sections and allow for two separate encapsulants over respective longitudinal sections.