A tiled electronic device comprising: a first electronic device including: a first substrate having a first upper surface, a first lower surface opposite to the first upper surface, and a first side surface connected between the first upper surface and the first lower surface; and a first flexible substrate disposed around the first substrate and comprising a first upper portion, a first lower portion, and a first connection portion connected between the first upper portion and the first lower portion, wherein the first upper portion is disposed on and corresponding to the first upper surface, the first lower portion is disposed under and corresponding to the first lower surface, and the first connection portion is disposed adjacent to and corresponding to the first side surface; and a second electronic device disposed adjacent to the first electronic device and comprising: a second substrate having a second upper surface, a second lower surface opposite to the second upper surface, and a second side surface connected between the second upper surface and the second lower surface, wherein the second side surface is opposite and adjacent to the first side surface, and the first connection portion is located between the first side surface and the second side surface; the first electronic device further comprises a plurality of first electronic units disposed on the first upper surface, and the second electronic device further comprises a plurality of second electronic units disposed on the second upper surface; and the plurality of first electronic units have an edge electronic unit adjacent to the second electronic device; characterized in that a first distance is between the edge electronic unit and one of the second electronic units closest to the edge electronic unit, and a substrate spacing is between the first side surface and the second side surface, wherein the substrate spacing is less than or equal to the first distance, and the first connection portion has a curved structure and has different thicknesses in a first direction, and the first direction is a normal direction of the first side surface. a first substrate having a first upper surface, a first lower surface opposite to the first upper surface, and a first side surface connected between the first upper surface and the first lower surface; and a first flexible substrate disposed around the first substrate and comprising a first upper portion, a first lower portion, and a first connection portion connected between the first upper portion and the first lower portion, wherein the first upper portion is disposed on and corresponding to the first upper surface, the first lower portion is disposed under and corresponding to the first lower surface, and the first connection portion is disposed adjacent to and corresponding to the first side surface; and a second electronic device disposed adjacent to the first electronic device and comprising: a second substrate having a second upper surface, a second lower surface opposite to the second upper surface, and a second side surface connected between the second upper surface and the second lower surface, wherein the second side surface is opposite and adjacent to the first side surface, and the first connection portion is located between the first side surface and the second side surface; the first electronic device further comprises a plurality of first electronic units disposed on the first upper surface, and the second electronic device further comprises a plurality of second electronic units disposed on the second upper surface; and the plurality of first electronic units have an edge electronic unit adjacent to the second electronic device; characterized in that a first distance is between the edge electronic unit and one of the second electronic units closest to the edge electronic unit, and a substrate spacing is between the first side surface and the second side surface, wherein the substrate spacing is less than or equal to the first distance, and the first connection portion has a curved structure and has different thicknesses in a first direction, and the first direction is a normal direction of the first side surface. a second substrate having a second upper surface, a second lower surface opposite to the second upper surface, and a second side surface connected between the second upper surface and the second lower surface, wherein the second side surface is opposite and adjacent to the first side surface, and the first connection portion is located between the first side surface and the second side surface; the first electronic device further comprises a plurality of first electronic units disposed on the first upper surface, and the second electronic device further comprises a plurality of second electronic units disposed on the second upper surface; and the plurality of first electronic units have an edge electronic unit adjacent to the second electronic device; characterized in that a first distance is between the edge electronic unit and one of the second electronic units closest to the edge electronic unit, and a substrate spacing is between the first side surface and the second side surface, wherein the substrate spacing is less than or equal to the first distance, and the first connection portion has a curved structure and has different thicknesses in a first direction, and the first direction is a normal direction of the first side surface.