A tiled display device (100) includes a first panel (102). The first panel (102) includes a first lower substrate (1024) and a first upper substrate (1022) disposed opposite to the first lower substrate (1024). The first upper substrate (1022) includes a first upper surface (1022US), a first lower surface (1022DS) and a first side surface (1022SS) located between the first upper surface (1022US) and the first lower surface (1022DS). The tiled display device (100) further includes a second panel (104) disposed adjacent to the first side surface (1022SS) of the first panel (102). A portion of the first side surface (1022SS) is not perpendicular to the first upper surface (1022US) or the first lower surface (1022DS), and a portion of the second side surface (1042SS) is not perpendicular to the second upper surface (1042US) or the second lower surface (1042DS).