Organic light emitting diode lighting apparatus

1. An organic light emitting diode (OLED) lighting apparatus comprising:

a light emitting panel including a substrate and an organic light emitting diode on the substrate, the organic light emitting diode including a first electrode, an organic emission layer disposed on the first electrode, and a second electrode disposed on the organic emission layer;

a housing for housing the light emitting panel;

a cover coupled to the housing and covering a front-side edge of the light emitting panel;

a plurality of pin springs disposed between the housing and the light emitting panel and supporting an edge of the light emitting panel;

at least one contact bar disposed between the plurality of pin springs and a back-side edge of the substrate; and

an electrode pad formed at a back-side edge of the substrate, extended from at least one of the first electrode or the second electrode, and contacting the contact bar.

2. The OLED lighting apparatus of claim 1 , wherein the contact bar makes at least one of a line contact and a surface contact with a back-side edge of the substrate.

3. The OLED lighting apparatus of claim 1 , wherein the contact bar is formed in a semi-cylindrical shape.

4. The OLED lighting apparatus of claim 3 , wherein the electrode pad contacts a convex part of the contact bar.

5. The OLED lighting apparatus of claim 3 , wherein the plurality of pin springs contact a concave part of the contact bar.

6. The OLED lighting apparatus of claim 1 , wherein the plurality of pin springs and the contact bar transfer an electric current to the light emitting panel.