Patent ID: 8746169

Claim:
A mask frame assembly for thin film deposition, the mask frame assembly comprising: a frame having a single opening; and at least two unit masks covering the opening, having end portions in a longitudinal direction fixed to the frame, and having planar surfaces at an upper level, a lower level, and a middle level between the upper level and the lower level, the unit masks being between the upper level and the lower level, a representative unit mask of the unit masks comprising: first regions and second regions successively arranged in the longitudinal direction and integrally formed on the representative unit mask, the first regions having corresponding first top surfaces at the upper level and first bottom surfaces at the middle level, the first regions having corresponding unit masking patterns, each of the unit masking patterns having a plurality of openings for thin film deposition, the unit masking patterns being spaced apart from each other by the second regions, the second regions having corresponding pairs of second top surfaces at the upper level, second bottom surfaces at the lower level, and valleys enclosed by first opposing walls formed at edges of the corresponding pairs of second top surfaces and having floors at the middle level, a representative second region of the second regions of the representative unit mask comprising: one of the pairs of second top surfaces, one of the second bottom surfaces, and one of the valleys having one of the floors interposed between a pair of adjacent ones of the first regions of the representative unit mask, the pair of adjacent ones of the first regions having a first thickness in a thickness direction from a first side of the representative unit mask at the upper level to a second side of the representative unit mask opposite to the first side at the middle level, the one of the floors having a second thickness in the thickness direction from the one of the floors at the middle level to the one of the second bottom surfaces at the lower level, such that the pair of adjacent ones of the first regions is offset from the one of the valleys in the thickness direction.