Abstract: A metal mask includes a metal plate having an evaporation surface and a back surface and a plurality of through-holes. Each through-hole forms a first opening on the evaporation surface and a neck opening between the evaporation surface and the back surface. The first opening has two first long edges and two opposite first short edges. The neck opening has two second long edges and two second short edges. A ratio of a length of the second long edge to a length of the second short edge is equal to or greater than 2.5. A first angle is formed between a connecting line between the first long edge and the second long edge and the back surface, a second angle is formed between a connecting line between the adjacent first short edge and second short edge and the back surface, and the second angle is less than the first angle.

Abstract: A metal mask includes a metal panel, provided with an evaporation surface and a back surface opposite to each other and a plurality of through holes extending from the evaporation surface to the back surface. A size of each through hole decreases gradually from the evaporation surface towards the back surface. A first opening is formed by each through hole in the evaporation surface. The first opening includes a primary opening part and a plurality of secondary opening parts. The primary opening part is provided with two long edges opposite to each other and two short edges opposite to each other. The two short edges are connected between the two long edges, and the secondary opening parts are connected at two ends of the long edges. Each secondary opening part has a width perpendicular to the length. A method to produce the metal mask is also provided.