Organic light emitting display panel

An organic light emitting display (OLED) panel, comprising:

• a substrate comprising a first region and a second region disposed along a first direction;
• a plurality of first pixels disposed in the first region on the substrate, the plurality of first pixels each having a first area, the plurality of first pixels each comprising a first unit pixel, a second unit pixel disposed along a second direction perpendicular to the first direction from the first unit pixel, and a transmission portion disposed along the first direction from the first unit pixel and the second unit pixel;
• a plurality of second pixels disposed in the second region on the substrate, the plurality of second pixels each having a second area less than the first area, the plurality of second pixels each comprising a third unit pixel;
• a pixel electrode disposed in each of the first unit pixel, the second unit pixel, and the third unit pixel;
• a common electrode facing the pixel electrode;
• and
• an organic light emitting layer disposed between the pixel electrode and the common electrode, the organic light emitting layer disposed corresponding to each of the first unit pixel, the second unit pixel, the third unit pixel, and the transmission portion.