A mask has a mask pattern region and a non-mask pattern region located at a peripheral of the mask pattern region. The mask pattern region includes at least one effective mask region. In any effective mask region, the mask includes a plurality of evaporation holes and at least one shielding; strip. Each shielding, strip is located between two adjacent evaporation holes. The mask has at least one welding region in the non-mask pattern region. A thickness of a portion of the mask in the non-mask pattern region and at least in the welding region is greater than a thickness of the shielding strip of the mask in the effective mask region, and the thickness refers to a dimension of the corresponding portion along a direction perpendicular to a plane where the mask is located.