Display device and manufacturing method thereof

A method for manufacturing a display device, the method comprising:

• providing a substrate including green pixels, blue pixels, red pixels, and optical sensing pixels;
• and
• forming an emission layer of the green pixel, wherein:
• a first group of the optical sensing pixels are disposed in a same line in a second direction,
• a second group comprising a group of the red pixels, a group of the optical sensing pixels, and a group of the blue pixels are disposed in a same line in a first direction that is perpendicular to the second direction,
• a distance between a first of the blue pixels and a first of the red pixels disposed with a first of the optical sensing pixels therebetween is longer than a distance between the first of the blue pixels and a second of the red pixels not disposed with the optical sensing pixel therebetween,
• the green pixels are disposed in parallel to each other in the first direction, and
• the forming of an emission layer of the green pixel includes forming emission layers of neighboring groups of the green pixels in the first direction by using one mask opening.