Deposition mask and method of manufacturing the same

A method of manufacturing a deposition mask, the method comprising:

• forming a main coating film on a mask substrate and removing a portion of the main coating film to form a pixel opening;
• forming an auxiliary coating film on the mask substrate in a portion overlapping the pixel opening;
• removing a portion of the mask substrate to form a mask opening;
• and
• removing the auxiliary coating film to allow the pixel opening and the mask opening to be in connection with each other,
• wherein, in the forming of the auxiliary coating film, the auxiliary coating film is formed in plural numbers, and each of the auxiliary coating films is spaced apart from each other.

An electronic device comprising:

• a display device formed using a deposition mask, the deposition mask comprising:
• a mask substrate including a mask opening;
• a main coating film including a mask pattern overlapping the mask opening;
• and
• a pixel opening defined by the mask pattern, the mask pattern spaced apart from each other by the pixel opening, wherein
• the mask substrate includes:
• a first surface facing the main coating film;
• a second surface facing the first surface;
• a first side surface connected to the first surface;
• and
• a second side surface connecting the first side surface and the second surface,
• the first side surface forms an undercut with the main coating film, and
• the mask substrate increases as being closer to the main coating film in a perpendicular direction to the mask substrate.