Lighting device having illumination, backlighting and display applications
AssigneeGE Lighting Solutions, LLC
InventorsBoris Kolodin, Srinath Aanegola, Emil Vergilov Radkov
Life of this patent
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Abstract
Provided are a lighting device, a backlighting device, and a display device that comprise a radiation source such as LED and wavelength converting members comprising phosphors. In one embodiment, self-absorption within the devices is suppressed or reduced by placing a selective reflector between two wavelength converting members, and the wavelength converting member emitting light with longer peak wavelength is substantially isolated from the irradiation of another wavelength converting member emitting light with shorter peak wavelength. In other embodiments, the wavelength converting members are arranged in strip configuration; or in adjacent hexagons configuration.
Claims20
A lighting device, which comprises a single radiation source, a first wavelength converting member, a second wavelength converting member, and a third wavelength converting member, wherein:
- said first wavelength converting member absorbs at least a portion of the electromagnetic radiation originated from said single radiation source, and emits a first electromagnetic radiation with peak wavelength λe1,
- said second wavelength converting member absorbs at least a portion of the electromagnetic radiation originated from said single radiation source, and emits a second electromagnetic radiation with peak wavelength λe2;
- said third wavelength converting member absorbs at least a portion of the electromagnetic radiation originated from said single radiation source and emits a third electromagnetic radiation with peak wavelength λe3;
- λe1>λe2>λe3;
- and
- said first wavelength converting member is substantially isolated from the irradiation of the second electromagnetic radiation, wherein said lighting device further includes a first selective reflector located between said first and second wavelength converting member, and a second selective reflector between said second wavelength converting member and said third wavelength converting member, wherein said first selective reflector is configured to selectively reflect radiation capable of being absorbed by said first wavelength converting member.
A backlighting device, which comprises a radiation source, a first wavelength converting member, a second wavelength converting member, and a third wavelength converting member, wherein:
- said first wavelength converting member absorbs at least a portion of the electromagnetic radiation originated from said radiation source, and emits a first electromagnetic radiation with peak wavelength λe1;
- said second wavelength converting member absorbs at least a portion of the electromagnetic radiation originated from said radiation source, and emits a second electromagnetic radiation with peak wavelength λe2,
- said third wavelength converting member absorbs at least a portion of the electromagnetic radiation originated from said radiation source and emits a third electromagnetic radiation with peak wavelength λe3;
- λe1>λe2>λe3;
- and
- said first wavelength converting member is substantially isolated from the irradiation of the second electromagnetic radiation, wherein said lighting device further includes a first selective reflector located between said first and second wavelength converting member, and a second selective reflector between said second wavelength converting member and said third wavelength converting member, wherein said first selective reflector is configured to selectively reflect radiation capable of being absorbed by said first wavelength converting member, and wherein said first wavelength converting member comprises a red phosphor, said second wavelength converting member comprises a green phosphor, and said third wavelength converting member comprises a blue phosphor.
A display device, which comprises a radiation source, a first wavelength converting member, and a second wavelength converting member, wherein
- said first wavelength converting member absorbs at least a portion of the electromagnetic radiation originated from said radiation source, and emits a first electromagnetic radiation with peak wavelength λe1,
- said second wavelength converting member absorbs at least a portion of the electromagnetic radiation originated from said radiation source, and emits a second electromagnetic radiation with peak wavelength λe2;
- λe1>λe2;
- and
- said first wavelength converting member is substantially isolated from the irradiation of the second electromagnetic radiation, wherein said first and second wavelength converting members include at least a plurality of first wavelength converting members and second wavelength converting members, which take the shape of hexagonal cells and are horizontally adjacent and arranged in sequential repetition to reduce self-absorption between them.
Dependencies are inferred from the claim text.