Organic electroluminescent display device

An organic EL display device including a display region comprising:

• a substrate;
• a plurality of pixels in the display region including a cathode;
• a first power source bus line electrically connected with the plurality of pixels, the first power source bus line comprising a first portion disposed along a first side of the display region, a second portion disposed along a second side of the display region, and a third portion disposed along a third side of the display region which is connecting the first side and the second side;
• a cathode contact electrically connecting the cathode, the cathode contact comprising a first portion extended along a fourth side of the display region which is facing the third side of the display region with the display region therebetween;
• and
• a scanning line drive circuit disposed along the third side of the display region, and transmitting scanning signals to the plurality of pixels,
• wherein the first power source bus line and the cathode contact are supplied with different voltage levels from each other, and the third portion of the first power source bus line is disposed between the display region and the scanning line drive circuit, and
• wherein the first portion, the second portion, and the third portion of the first power source bus line are positioned outside the display region.