A backlight unit comprising: a plurality of circuit boards arranged on a plane mounted with light emitting diodes on a first surface, wherein each circuit board comprises a connecting pad electrically connected with the light emitting diodes; wherein the circuit boards are printed boards, each circuit board comprising connecting portions to which the light emitting diodes are coupled; and printed lines connecting the connecting portions to the connecting pad; characterized in that it further comprises a driver installed on a second surface of the circuit boards, and adapted to drive the light emitting diodes mounted on the circuit boards; a connector coupled to the connecting pad of each circuit board, the connector having a connecting direction that is changed toward the driver, wherein the connector comprises a plurality of first connecting pins in contact with the connecting pad; and a connecting line connecting the driver to a plurality of second connecting pins of the connector, said plurality of second connecting pins being vertically bent toward a back surface of each circuit board such that the circuit board can be independently driven by the driver, wherein the first surface is a front surface of each circuit board and the second surface is the back surface of each circuit board, said plurality of second pins extending from the first pins while being bent from the first pins toward a back side of the circuit board. wherein the second pins are bent from the first pins by 90°, wherein the connecting line comprises: first connecting lines for connecting a first column of the circuit boards to one side of the driver; and second connecting lines for connecting, to the other side of the driver, a second column of the circuit boards adjacent to the first column of the circuit boards. a plurality of circuit boards arranged on a plane mounted with light emitting diodes on a first surface, wherein each circuit board comprises a connecting pad electrically connected with the light emitting diodes; wherein each circuit board comprises a connecting pad electrically connected with the light emitting diodes; wherein the circuit boards are printed boards, each circuit board comprising connecting portions to which the light emitting diodes are coupled; and printed lines connecting the connecting portions to the connecting pad; connecting portions to which the light emitting diodes are coupled; and printed lines connecting the connecting portions to the connecting pad; characterized in that it further comprises a driver installed on a second surface of the circuit boards, and adapted to drive the light emitting diodes mounted on the circuit boards; a connector coupled to the connecting pad of each circuit board, the connector having a connecting direction that is changed toward the driver, wherein the connector comprises a plurality of first connecting pins in contact with the connecting pad; and a connecting line connecting the driver to a plurality of second connecting pins of the connector, said plurality of second connecting pins being vertically bent toward a back surface of each circuit board such that the circuit board can be independently driven by the driver, a driver installed on a second surface of the circuit boards, and adapted to drive the light emitting diodes mounted on the circuit boards; a connector coupled to the connecting pad of each circuit board, the connector having a connecting direction that is changed toward the driver, wherein the connector comprises a plurality of first connecting pins in contact with the connecting pad; and a connecting line connecting the driver to a plurality of second connecting pins of the connector, said plurality of second connecting pins being vertically bent toward a back surface of each circuit board such that the circuit board can be independently driven by the driver, wherein the first surface is a front surface of each circuit board and the second surface is the back surface of each circuit board, said plurality of second pins extending from the first pins while being bent from the first pins toward a back side of the circuit board. wherein the second pins are bent from the first pins by 90°, wherein the connecting line comprises: first connecting lines for connecting a first column of the circuit boards to one side of the driver; and second connecting lines for connecting, to the other side of the driver, a second column of the circuit boards adjacent to the first column of the circuit boards. first connecting lines for connecting a first column of the circuit boards to one side of the driver; and second connecting lines for connecting, to the other side of the driver, a second column of the circuit boards adjacent to the first column of the circuit boards.