Backlight unit, display device comprising same, and method for manufacturing display device

A display device comprising:

• a substrate;
• a plurality of first metal wiring layers disposed on the substrate;
• a first insulating layer deposited on the substrate to cover the first metal wiring layer;
• a second metal wiring layer disposed on the first insulating layer and including at least portions spaced apart from each other;
• and
• a second insulating layer deposited on the second metal wiring layer,
• wherein the second metal wiring layer includes:
• at least one first metal layer having a first conductivity;
• and
• at least one second metal layer having a higher conductivity than the first metal layer,
• wherein the first metal layer blocks diffusion of the second metal layer.

A method for manufacturing a display device including a semiconductor light emitting device, the method comprising:

• depositing a first insulating layer on a substrate patterned with a plurality of first metal wiring layers;
• forming, on the first insulating layer, a second metal wiring layer including at least one first metal layer having a first conductivity and at least one second metal layer having a higher conductivity than the first metal layer;
• forming a second insulating layer deposited on a portion of the second metal wiring layer while defining a hole therein so as to be connected to the semiconductor light emitting device;
• disposing a conductive bonding layer on the second metal wiring layer so as to fill the hole;
• and
• disposing the semiconductor light emitting device on the second insulating layer so as to be connected to the second metal wiring layer via the conductive bonding layer.