Patent ID: 8402917

Claim:
A mask frame assembly for thin film deposition, comprising: a frame including an opening portion and a support portion; and a mask including a deposition area in a position corresponding to the opening portion, wherein: the mask includes: a first layer including the deposition area and a peripheral portion disposed outside the deposition area, and a second layer including a mask opening portion and a welding portion, the welding portion including two pairs of opposing sides having a first surface and a second surface opposite to the first surface, at least a part of the first surface of the second layer faces the first layer and contacts the peripheral portion, the second surface of the two pairs of opposing sides is welded to the support portion of the frame, the mask opening portion includes an opening having a periphery, the periphery being defined by the two pairs of opposing sides, and the opening of the mask opening portion being coextensive with the opening portion of the frame, and the first layer includes welding patterns corresponding to welding points on the welding portion of the second layer where the second layer is welded to the support portion of the frame.