Mask, mask assembly, and method for manufacturing mask assembly

A mask assembly, comprising:

• a mask frame comprising a plurality of borders and an open region surrounded by the plurality of borders;
• at least one mask, wherein the at least one mask comprises an effective mask region located in a middle portion of the mask, wherein the effective mask region comprises a plurality of first through holes arranged in an array;
• and a welding region configured to be welded to a mask frame and located on opposite sides of the effective mask region, wherein the welding region comprises a plurality of second through holes arranged in an array;
• and
• a welding sheet, wherein the welding sheet is located on a side of the welding region away from the mask frame, and the welding sheet is configured to weld the welding region to two opposite borders of the mask frame,
• wherein the at least one mask comprises a plurality of masks, and the plurality of masks are sequentially arranged in an extending direction of the two opposite borders,
• wherein the welding sheet is in a shape of a long strip, and the welding sheet is welded to welding regions of the plurality of masks and the two opposite borders of the mask frame, and
• wherein a material of the mask frame and a material of the welding sheet are the same as a material of the mask, and each of the material of the mask frame, the material of the welding sheet and the material of the at least one mask is a metal or metal alloy with a low coefficient of expansion.