A backlight apparatus comprising: a plurality of light emitting modules; at least one driving unit adapted to independently drive the plurality of light emitting modules: a light guide plate adapted to uniformly transmit light emitted from the plurality of light emitting modules towards a display panel; a substrate which comprises a plurality of layers including a top layer and lower layers (202, 203), wherein the top layer is connected to each lower layer through at least one respective via hole (326, 336), wherein the plurality of light emitting modules are arranged on the top layer, and a plurality of wires (310, 320, 330) penetrate through the plurality of layers to electrically connect the plurality of light emitting modules and the at least one driving unit, wherein each lower layer has at least one wire of said plurality of wires arranged to communicate with the at least one respective via hole associated with that lower layer; characterized in that the backlight apparatus further comprises: a bottomchassis which accommodates the light guide plate, the plurality of light emitting modules, and the substrate at a lower end of the display panel, such that the display panel is located on the top surface of the light guide plate perpendicular to a side surface of the light guide plate facing the top layer of the substrate with the plurality of light emitting modules, and such that the plurality of light emitting modules are arranged to irradiate light to said side surface of the light guide plate. a plurality of light emitting modules; at least one driving unit adapted to independently drive the plurality of light emitting modules: a light guide plate adapted to uniformly transmit light emitted from the plurality of light emitting modules towards a display panel; a substrate which comprises a plurality of layers including a top layer and lower layers (202, 203), wherein the top layer is connected to each lower layer through at least one respective via hole (326, 336), wherein the plurality of light emitting modules are arranged on the top layer, and a plurality of wires (310, 320, 330) penetrate through the plurality of layers to electrically connect the plurality of light emitting modules and the at least one driving unit, wherein each lower layer has at least one wire of said plurality of wires arranged to communicate with the at least one respective via hole associated with that lower layer; characterized in that the backlight apparatus further comprises: a bottomchassis which accommodates the light guide plate, the plurality of light emitting modules, and the substrate at a lower end of the display panel, such that the display panel is located on the top surface of the light guide plate perpendicular to a side surface of the light guide plate facing the top layer of the substrate with the plurality of light emitting modules, and such that the plurality of light emitting modules are arranged to irradiate light to said side surface of the light guide plate. a light guide plate adapted to uniformly transmit light emitted from the plurality of light emitting modules towards a display panel; a substrate which comprises a plurality of layers including a top layer and lower layers (202, 203), wherein the top layer is connected to each lower layer through at least one respective via hole (326, 336), wherein the plurality of light emitting modules are arranged on the top layer, and a plurality of wires (310, 320, 330) penetrate through the plurality of layers to electrically connect the plurality of light emitting modules and the at least one driving unit, wherein each lower layer has at least one wire of said plurality of wires arranged to communicate with the at least one respective via hole associated with that lower layer; characterized in that the backlight apparatus further comprises: a bottomchassis which accommodates the light guide plate, the plurality of light emitting modules, and the substrate at a lower end of the display panel, such that the display panel is located on the top surface of the light guide plate perpendicular to a side surface of the light guide plate facing the top layer of the substrate with the plurality of light emitting modules, and such that the plurality of light emitting modules are arranged to irradiate light to said side surface of the light guide plate.