Display device, method for manufacturing display device and tiled display device

A display device, a method of manufacturing the display device, and a tiled display device including a plurality of display devices are provided. The display device includes a substrate including a first surface, a second surface opposite to the first surface, and a first side surface disposed between the first surface and the second surface; a light emitting element disposed on the first surface and emitting light; the side wiring is arranged on the first surface, the first side surface and the second surface; and an overcoat layer covering the side wiring, wherein the overcoat layer contains at least any one of CaCO3 and xCaO.ySiO2.zH2O (x, y, and z are natural numbers). 提供了显示装置、制造所述显示装置的方法以及包括多个显示装置的拼接显示装置。显示装置包括：衬底，所述衬底包括第一表面、与所述第一表面相对的第二表面、以及设置在所述第一表面与所述第二表面之间的第一侧表面；设置在所述第一表面上并且发射光的发光元件；设置在所述第一表面、所述第一侧表面和所述第二表面上的侧布线；以及覆盖所述侧布线的外涂层，其中所述外涂层包含CaCO3和xCaO·ySiO2·zH2O(x、y和z是自然数)中的至少任一种。