A flat panel display device, comprising: a lower substrate; a plurality of self-luminant devices arranged on the lower substrate, each of the self-luminant devices comprising: a lower electrode layer: a transparent electrode layer 16 facing the lower electrode layer; a protective layer directly on the transparent electrode layer, the protective layer formed from an epoxy based organic material or an acryl based organic material and an intermediate layer that includes at least a light emitting layer, the intermediate layer being interposed between the lower electrode layer and the transparent electrode layer; and a sealing substrate: and a lens sheet located between the protective layer and the sealing substrate and directly on the protective layer, the lens sheet comprising a plurality of condensing lenses arranged on the transparent electrode layer, with a distance between an exterior side of the lens sheet and the light emitting layer of a nearest one of said plurality of self luminant devices in a direction of propagation of light emitted from the self-luminant device being between 50 and 500 microns, wherein the lens sheet comprises a first planar surface and a second surface which has a plurality of convex portions, wherein the first surface of the lens sheet faces towards the plurality of self-luminant devices and the second surface of the lens sheet faces away from the plurality of self-luminant devices, wherein a medium layer is provided between the lens sheet and the sealing substrate having a planar upper surface directly contacting the sealing substrate and a lower surface directly contacting the exterior side of the lens sheet, wherein the shape of the lower surface of the medium layer 38 corresponds with the shape of the exterior side of the lens sheet, and wherein the medium layer has a refractive index being smaller than a refractive index of the lens sheet. a lower substrate; a plurality of self-luminant devices arranged on the lower substrate, each of the self-luminant devices comprising: a lower electrode layer: a transparent electrode layer 16 facing the lower electrode layer; a protective layer directly on the transparent electrode layer, the protective layer formed from an epoxy based organic material or an acryl based organic material and an intermediate layer that includes at least a light emitting layer, the intermediate layer being interposed between the lower electrode layer and the transparent electrode layer; and a sealing substrate: and a lens sheet located between the protective layer and the sealing substrate and directly on the protective layer, the lens sheet comprising a plurality of condensing lenses arranged on the transparent electrode layer, with a distance between an exterior side of the lens sheet and the light emitting layer of a nearest one of said plurality of self luminant devices in a direction of propagation of light emitted from the self-luminant device being between 50 and 500 microns, wherein the lens sheet comprises a first planar surface and a second surface which has a plurality of convex portions, wherein the first surface of the lens sheet faces towards the plurality of self-luminant devices and the second surface of the lens sheet faces away from the plurality of self-luminant devices, wherein a medium layer is provided between the lens sheet and the sealing substrate having a planar upper surface directly contacting the sealing substrate and a lower surface directly contacting the exterior side of the lens sheet, wherein the shape of the lower surface of the medium layer 38 corresponds with the shape of the exterior side of the lens sheet, and wherein the medium layer has a refractive index being smaller than a refractive index of the lens sheet. a lower electrode layer: a transparent electrode layer 16 facing the lower electrode layer; a protective layer directly on the transparent electrode layer, the protective layer formed from an epoxy based organic material or an acryl based organic material and an intermediate layer that includes at least a light emitting layer, the intermediate layer being interposed between the lower electrode layer and the transparent electrode layer; and a sealing substrate: and a lens sheet located between the protective layer and the sealing substrate and directly on the protective layer, the lens sheet comprising a plurality of condensing lenses arranged on the transparent electrode layer, with a distance between an exterior side of the lens sheet and the light emitting layer of a nearest one of said plurality of self luminant devices in a direction of propagation of light emitted from the self-luminant device being between 50 and 500 microns, wherein the lens sheet comprises a first planar surface and a second surface which has a plurality of convex portions, wherein the first surface of the lens sheet faces towards the plurality of self-luminant devices and the second surface of the lens sheet faces away from the plurality of self-luminant devices, wherein a medium layer is provided between the lens sheet and the sealing substrate having a planar upper surface directly contacting the sealing substrate and a lower surface directly contacting the exterior side of the lens sheet, wherein the shape of the lower surface of the medium layer 38 corresponds with the shape of the exterior side of the lens sheet, and wherein the medium layer has a refractive index being smaller than a refractive index of the lens sheet.