Patent ID: 9122172
Filing Date: 2015-09-01
Classification: C23C,G03F

Abstract:
1. A shadow mask-substrate alignment method comprising: (a) positioning a collimated light source, a beam splitter, a substrate including a first grate, a shadow mask including a second grate, and a light receiver relative to each other to define a light path that includes collimated light output by the collimated light source being at least partially reflected by the beam splitter, the at least partially reflected collimated light passing through one of the first or second grate and being at least partially reflected by the other of the first or second grate back through the one of the first or second grate, and the at least partially reflected light reflected back through the one of the first or second grate passing at least partially through the beam splitter for receipt by the light receiver; and (b) causing the orientation of the substrate, the shadow mask or both to be adjusted to position the first grate, the second grate, or both the first and second grates until a predetermined amount is received by the light receiver, wherein: each grate includes a plurality of bars in spaced relation; each pair of spaced bars is separated by a gap; and at least one of the first grate and the second grate includes at least one gap that extends through the respective substrate and shadow mask.