A backlight apparatus includes a substrate which includes a plurality of layers. A plurality of light emitting modules are arranged on a top layer of the plurality of layers closest to a light guide panel, and a plurality of wires penetrates through the plurality of layers to electrically connect the light emitting modules and a plurality of driving units. Accordingly, the width of the substrate of an edge type backlight apparatus which can provide local dimming is reduced. Therefore, the display apparatus using the edge type backlight apparatus can be slim even if it is designed to provide local dimming.