Patent ID: 8869738

Claim:
A mask frame assembly for deposition of thin films, the mask frame assembly comprising: a frame defining a window; and multiple mask pieces arranged over the window to provide a plurality of unit masks, each unit mask being designed for a deposition pattern corresponding to a single display panel, wherein the multiple mask pieces comprises a first mask piece and a second mask piece arranged immediately next to the first mask piece, the first mask piece comprising a first mask portion, the second mask piece comprising a second mask portion, wherein the first mask portion of the first mask piece and the second mask portion of the second mask piece abut each other and in combination provide at least part of one of the plurality of unit masks wherein the first mask portion comprises a first row of openings, which comprises a first opening, a second opening immediately neighboring the first opening and a first interval between the first and second openings, wherein the second mask portion comprises a second row of openings, which comprises a third opening, a fourth opening immediately neighboring the third opening and a second interval between the third and fourth openings, wherein the second opening and the third opening immediately neighbor each other and are separated by a third interval having a length that is substantially the same as that of the first interval.