Light emitting diode filament
AssigneeSignify Holding B.V.
InventorsGrigory Alexandrovich Onushkin, Aldegonda Lucia Weijers, Jan De Graaf
Life of this patent
Estimating the term…
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.
Claims13
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.
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.
Dependencies are inferred from the claim text.