A display device, comprising: a substrate; a display part disposed on the substrate; a sealing substrate bonded to the substrate by a bonding layer (12, 13, 17) which surrounds the display part; wherein the sealing substrate is constituted by a plurality of layers (141, 142), wherein each of the plurality of layers is electrically conductive and comprises a resin base and a plurality of carbon fibers, wherein each of the plurality of layers is surrounded by an insulating layer and includes a first through-hole and wire layers are positioned among the plurality of layers; at least one conductor located between the substrate and the sealing substrate; and a first electrically conductive unit including a first connector extending through each first through-hole and contacting at least one of the said at least one conductors; wherein the insulating layer is disposed on the inner surface and outer surface of each of the plurality of layers and a side wall of each first through-hole; wherein the display part comprises a plurality of pixels, each comprising an organic light emitting diode and a driving circuit unit, wherein the organic light emitting diode includes a pixel electrode, and an organic emission layer and a common electrode and wherein the driving circuit unit includes a driving thin film transistor; wherein the said at least one conductor comprises a common power supply line configured to apply a common voltage to the thin film transistors, and the common electrode; each of the plurality of layers of the sealing substrate comprises a second through-hole; the first electrically conductive unit is formed on an inner surface and an outer surface of the sealing substrate and the first connector extends through the said first through-hole of each of the plurality of layers for supplying a first signal to the common power supply line; a second electrically conductive unit including a second connector is formed on both the inner surface and the outer surface of the sealing substrate and the second connector extends through the second through-hole of each of the plurality of layers for supplying a second signal to the common electrode; a first pad section disposed outside of the display part and connected with the common power supply line; wherein the first electrically conductive unit is connected with the first pad section by an electrically conductive bonding layer; and the second electrically conductive unit comprises a second internal layer on the inner surface of the sealing substrate which is in direct physical contact with the common electrode, and a second external layer positioned on the outer surface of the sealing substrate. a substrate; a display part disposed on the substrate; a sealing substrate bonded to the substrate by a bonding layer (12, 13, 17) which surrounds the display part; wherein the sealing substrate is constituted by a plurality of layers (141, 142), wherein each of the plurality of layers is electrically conductive and comprises a resin base and a plurality of carbon fibers, wherein each of the plurality of layers is surrounded by an insulating layer and includes a first through-hole and wire layers are positioned among the plurality of layers; at least one conductor located between the substrate and the sealing substrate; and a first electrically conductive unit including a first connector extending through each first through-hole and contacting at least one of the said at least one conductors; wherein the insulating layer is disposed on the inner surface and outer surface of each of the plurality of layers and a side wall of each first through-hole; wherein the display part comprises a plurality of pixels, each comprising an organic light emitting diode and a driving circuit unit, wherein the organic light emitting diode includes a pixel electrode, and an organic emission layer and a common electrode and wherein the driving circuit unit includes a driving thin film transistor; wherein the said at least one conductor comprises a common power supply line configured to apply a common voltage to the thin film transistors, and the common electrode; each of the plurality of layers of the sealing substrate comprises a second through-hole; the first electrically conductive unit is formed on an inner surface and an outer surface of the sealing substrate and the first connector extends through the said first through-hole of each of the plurality of layers for supplying a first signal to the common power supply line; a second electrically conductive unit including a second connector is formed on both the inner surface and the outer surface of the sealing substrate and the second connector extends through the second through-hole of each of the plurality of layers for supplying a second signal to the common electrode; a first pad section disposed outside of the display part and connected with the common power supply line; wherein the first electrically conductive unit is connected with the first pad section by an electrically conductive bonding layer; and the second electrically conductive unit comprises a second internal layer on the inner surface of the sealing substrate which is in direct physical contact with the common electrode, and a second external layer positioned on the outer surface of the sealing substrate.