Mask frame assembly for thin film deposition and method of assembling the same

1. A mask frame assembly for thin film deposition, the mask frame assembly comprising:

a frame having an opening and a plurality of grooves;

a plurality of masks having deposition patterns, the masks being spaced from each other and fixed to the frame such that the deposition patterns extend over the opening, wherein a longitudinal axis of each of the masks extends in a first direction; and

a balance stick being fixed to one of the grooves on the frame, wherein the balance stick is between two of the plurality of masks such that a longitudinal axis of the balance stick is substantially parallel to the longitudinal axis of each of the masks, the balance stick comprising an elastic material, wherein a thickness of the balance stick is greater than a thickness of each of the masks and wherein an outwardly-facing surface of each balance stick is substantially flush with an outwardly-facing surface of each of the masks.

2. The mask frame assembly of claim 1 , wherein the plurality of masks are elongate and extend from a first side to a second side of the frame.

3. The mask frame assembly of claim 1 , wherein a depth of the groove is substantially equal to a difference between the thickness of the balance stick and the thickness of each of the masks.

4. The mask frame assembly of claim 1 , wherein a width of the balance stick is smaller than a width of each of the masks.

5. The mask frame assembly of claim 1 , wherein a shielding mask is attached to the balance stick and shields a gap between the balance stick and the masks.