A display device, comprising: a power generator generating a driving voltage; a display panel that includes a plurality of pixels and displays images by using the driving voltage; and a power transfer line for transferring the driving voltage output from the power generator to the display panel, wherein the power transfer line further includes: an input line to which the driving voltage is supplied from the power generator; a closed-loop line provided in a closed-loop type and connected to the input line; and a plurality of output lines outputting the driving voltage supplied through the closed-loop line to the display panel, wherein the closed-loop line includes: a first line provided along a length direction of the printed circuit board and thus connected to the input line; a second line provided in parallel with the first line and thus connected to the plurality of output lines; a first connection line connecting ends at one side of each of the first and second lines (514a, 514b) with each other; and a second connection line connecting ends at the other side of each of the first and second lines (514a, 514b) with each other, characterized in that the display device further comprises a printed circuit board disposed between the power generator and the display panel, and having a multi-layered structure, wherein the power transfer line is formed in a rectangular ring shape erected three-dimensionally and provided in a closed-loop type in the printed circuit board. a power generator generating a driving voltage; a display panel that includes a plurality of pixels and displays images by using the driving voltage; and a power transfer line for transferring the driving voltage output from the power generator to the display panel, wherein the power transfer line further includes: an input line to which the driving voltage is supplied from the power generator; a closed-loop line provided in a closed-loop type and connected to the input line; and a plurality of output lines outputting the driving voltage supplied through the closed-loop line to the display panel, wherein the closed-loop line includes: a first line provided along a length direction of the printed circuit board and thus connected to the input line; a second line provided in parallel with the first line and thus connected to the plurality of output lines; a first connection line connecting ends at one side of each of the first and second lines (514a, 514b) with each other; and a second connection line connecting ends at the other side of each of the first and second lines (514a, 514b) with each other, characterized in that the display device further comprises a printed circuit board disposed between the power generator and the display panel, and having a multi-layered structure, wherein the power transfer line is formed in a rectangular ring shape erected three-dimensionally and provided in a closed-loop type in the printed circuit board. an input line to which the driving voltage is supplied from the power generator; a closed-loop line provided in a closed-loop type and connected to the input line; and a plurality of output lines outputting the driving voltage supplied through the closed-loop line to the display panel, wherein the closed-loop line includes: a first line provided along a length direction of the printed circuit board and thus connected to the input line; a second line provided in parallel with the first line and thus connected to the plurality of output lines; a first connection line connecting ends at one side of each of the first and second lines (514a, 514b) with each other; and a second connection line connecting ends at the other side of each of the first and second lines (514a, 514b) with each other, characterized in that the display device further comprises a printed circuit board disposed between the power generator and the display panel, and having a multi-layered structure, wherein the power transfer line is formed in a rectangular ring shape erected three-dimensionally and provided in a closed-loop type in the printed circuit board. a first line provided along a length direction of the printed circuit board and thus connected to the input line; a second line provided in parallel with the first line and thus connected to the plurality of output lines; a first connection line connecting ends at one side of each of the first and second lines (514a, 514b) with each other; and a second connection line connecting ends at the other side of each of the first and second lines (514a, 514b) with each other, characterized in that the display device further comprises a printed circuit board disposed between the power generator and the display panel, and having a multi-layered structure, wherein the power transfer line is formed in a rectangular ring shape erected three-dimensionally and provided in a closed-loop type in the printed circuit board.