A light conversion device, comprising: a frame through which incident light is received from a light source and converted light is emitted from the light conversion device, the frame including: an opening which is open in a first direction, through which light of a first color is received from the light source and from which light of a second color different from the first color is emitted from the light conversion device, and a wall which surrounds the opening to define the opening, wherein the frame defines a length thereof in a second direction perpendicular to the first direction in which the opening is open, the opening is provided in plurality in the frame, the plurality of openings are disposed along the length of the frame, and the length of the frame is linearly extended in the second direction or is curved in the second direction, characterized by: a substrate inserted in the opening and supported by the wall which surrounds the opening; a light conversion layer which is disposed on the substrate and receives the light of the first color from the light source, the light conversion layer including a light converting particle which converts the light of the first color to the light of the second color; a first inorganic layer disposed on the light conversion layer and a first organic layer disposed on the first inorganic layer wherein at least one of the first inorganic layer and the first organic layer contacts the wall which surrounds the opening, to seal the light conversion layer on the substrate; and wherein the frame includes a metal, a polyolefin, a polyester, a polyimide, a polycarbonate, a polyethersulfone, a polyethyleneterephthalate, a polyethylene, a polycarbonate, a polyurethane, a polypropylene, an acrylonitrile-butadiene-styrene polymer, a polystyrene or a combination thereof. an opening which is open in a first direction, through which light of a first color is received from the light source and from which light of a second color different from the first color is emitted from the light conversion device, and a wall which surrounds the opening to define the opening, wherein the frame defines a length thereof in a second direction perpendicular to the first direction in which the opening is open, the opening is provided in plurality in the frame, the plurality of openings are disposed along the length of the frame, and the length of the frame is linearly extended in the second direction or is curved in the second direction, characterized by: a substrate inserted in the opening and supported by the wall which surrounds the opening; a light conversion layer which is disposed on the substrate and receives the light of the first color from the light source, the light conversion layer including a light converting particle which converts the light of the first color to the light of the second color; a first inorganic layer disposed on the light conversion layer and a first organic layer disposed on the first inorganic layer wherein at least one of the first inorganic layer and the first organic layer contacts the wall which surrounds the opening, to seal the light conversion layer on the substrate; and a substrate inserted in the opening and supported by the wall which surrounds the opening; a light conversion layer which is disposed on the substrate and receives the light of the first color from the light source, the light conversion layer including a light converting particle which converts the light of the first color to the light of the second color; a first inorganic layer disposed on the light conversion layer and a first organic layer disposed on the first inorganic layer wherein at least one of the first inorganic layer and the first organic layer contacts the wall which surrounds the opening, to seal the light conversion layer on the substrate; and wherein the frame includes a metal, a polyolefin, a polyester, a polyimide, a polycarbonate, a polyethersulfone, a polyethyleneterephthalate, a polyethylene, a polycarbonate, a polyurethane, a polypropylene, an acrylonitrile-butadiene-styrene polymer, a polystyrene or a combination thereof.