Electronic device

An electronic device, comprising:

• a first substrate comprising an edge, a first region, and a second region, wherein the second region is disposed between the edge and the first region, the first substrate further comprises a surface, and the surface has a normal direction;
• a first protrusion disposed on the surface of the first substrate in the first region, wherein a maximum distance from the surface of the first substrate to a first top surface of the first protrusion along the normal direction is defined as a first distance;
• a second protrusion disposed on the surface of the first substrate in the second region, wherein a maximum distance from the surface of the first substrate to a second top surface of the second protrusion along the normal direction is defined as a second distance;
• and
• a plurality of third protrusions disposed on the surface of the first substrate, wherein the first protrusion is disposed between two of the plurality of third protrusions, wherein a maximum distance from the surface of the first substrate to a third top surface of at least one of the plurality of third protrusions along the normal direction is defined as a third distance,
• wherein the first distance is different from the second distance, and the third distance is less than the first distance.