Deposition mask made of metal for oled pixel deposition and method for manufacturing deposition mask

A deposition mask comprising

• a metal plate including a deposition region and a non-deposition region,
• wherein the deposition region includes a plurality of effective regions forming a deposition pattern and a separation region between a plurality of effective portions,
• the plurality of effective regions include a plurality of through-holes, and
• the plurality of through-holes include:
• a plurality of small surface holes formed on one surface;
• a plurality of large surface holes formed on the other surface opposite to the one surface;
• and
• a communication portion for communicating the small surface hole and the large surface hole,
• wherein the communication portion has an elliptical shape having a first diameter and a second diameter different from the first diameter,
• the through-hole includes a communication portion connected to a first large surface hole in which one surface of the metal plate in a transverse-axis direction and the first diameter are inclined at an acute angle and a communication portion connected to a second large surface hole in which one surface of the deposition mask in the transverse-axis direction and the first diameter are inclined at an obtuse angle,
• the first large surface hole and the second large surface hole are alternately disposed in a row in a longitudinal-axis direction of the metal plate,
• the first large surface hole and the second large surface hole are alternately disposed in a row in the transverse-axis direction of the metal plate,
• a first island portion is disposed between two adjacent first large surface holes in a first diagonal direction connecting the first diameter of the communication portion connected to the first large surface hole,
• a second island portion is disposed between two adjacent second large surface holes in a second diagonal direction connecting the first diameter of the communication portion connected to the second large surface hole,
• a rib is disposed between the first island portion and the second island portion, and
• a size deviation between the first island portion and the second island portion that are adjacent to each other is 30% or less.