A wafer seal ring may be formed on a first and/or a second wafer. One or both of the first and/or second wafers may have one or more dies formed thereon. The wafer seal ring may be formed to surround the dies of a corresponding wafer. One or more die seal rings may be formed around the one or more dies. The wafer seal ring may be formed to a height that may be approximately equal to a height of one or more die seal rings formed on the first and/or second wafer. The wafer seal ring may be formed to provide for eutectic or fusion bonding processes. The first and second wafers may be bonded together to form a seal ring structure between the first and second wafers. The seal ring structure may provide a hermetic seal between the first and second wafers.

According to an aspect, a manufacturing method of a display device includes: obtaining a first reference position on a surface of a holding substrate based on positions of a plurality of first alignment marks of the holding substrate; and aligning the holding substrate with a transfer destination substrate such that the first reference position on the holding substrate and a second reference position on a surface of the transfer destination substrate coincide. The holding substrate is sectioned into a plurality of first sections and a plurality of second sections when viewed from one direction. Each of the first sections is provided in a part of a gap between the second sections when viewed from the one direction, has a light transmission rate higher than a light transmission rate of the second sections, and forms the first alignment mark through which light passes when viewed from the one direction.