An optoelectronic device comprising: a substrate comprising first and second opposite surfaces (14, 16), lateral electrical insulation elements extending from the first surface to the second surface and delimiting in the substrate first semiconductor or conductive portions electrically insulated from one another, the optoelectronic device further comprising, for each first portion, an assembly of light-emitting diodes resting on the first surface and electrically coupled to the first portion, each light-emitting diode comprising at least one wire-shaped, conical, or tapered semiconductor element integrating or covered at the top and/or at least on a portion of its lateral surfaces with a shell comprising at least one active layer capable of supplying most of the radiation of the light-emitting diode, the optoelectronic device further comprising a conductive electrode layer at least partially transparent at least in the emission wavelength range of the light-emitting diodes covering all the light-emitting diodes, a protection layer (40; 72; 106) containing a first dielectric material at least partially transparent at least in the emission wavelength range of the light-emitting diodes and possible luminophores present in the protection layer, and walls (42; 74; 110; 128) at least partly extending in the protection layer and delimiting in the protection layer second portions surrounding or opposite the assemblies of light-emitting diodes, the walls containing at least one second material different from the first material and comprised in the group comprising air, a metal, a semiconductor material, a metal alloy, a material partially transparent at least in the emission wavelength of the light-emitting diodes and of the possible luminophores, and a core made of a material at least partially transparent at least in the emission wavelength range of the light-emitting diodes and of the possible luminophores covered with a layer which is opaque or reflective at least in the emission wavelength range of the light-emitting diodes and of the possible luminophores. a substrate comprising first and second opposite surfaces (14, 16), lateral electrical insulation elements extending from the first surface to the second surface and delimiting in the substrate first semiconductor or conductive portions electrically insulated from one another, the optoelectronic device further comprising, for each first portion, an assembly of light-emitting diodes resting on the first surface and electrically coupled to the first portion, each light-emitting diode comprising at least one wire-shaped, conical, or tapered semiconductor element integrating or covered at the top and/or at least on a portion of its lateral surfaces with a shell comprising at least one active layer capable of supplying most of the radiation of the light-emitting diode, the optoelectronic device further comprising a conductive electrode layer at least partially transparent at least in the emission wavelength range of the light-emitting diodes covering all the light-emitting diodes, a protection layer (40; 72; 106) containing a first dielectric material at least partially transparent at least in the emission wavelength range of the light-emitting diodes and possible luminophores present in the protection layer, and walls (42; 74; 110; 128) at least partly extending in the protection layer and delimiting in the protection layer second portions surrounding or opposite the assemblies of light-emitting diodes, the walls containing at least one second material different from the first material and comprised in the group comprising air, a metal, a semiconductor material, a metal alloy, a material partially transparent at least in the emission wavelength of the light-emitting diodes and of the possible luminophores, and a core made of a material at least partially transparent at least in the emission wavelength range of the light-emitting diodes and of the possible luminophores covered with a layer which is opaque or reflective at least in the emission wavelength range of the light-emitting diodes and of the possible luminophores.