Display device, method of manufacturing the same and tiled display device including the same

A tiled display device comprising:

• a first display device and a second display device, the first display device and the second display device being adjacent to each other, the first display device and the second display device each comprising a display area having pixels and a non-display area adjacent to the display area;
• and
• a bonding part that bonds the first display device to the second display device,
• wherein the first display device and the second display device each comprise:
• a first substrate comprising a first contact hole;
• a fan-out line disposed in a first metal layer on the first substrate;
• a second substrate disposed on the first metal layer and comprising a second contact hole;
• a connection line disposed in a second metal layer on the second substrate, the connection line being electrically connected to the fan-out line through the second contact hole;
• a thin film transistor disposed in an active layer and a third metal layer on the second metal layer;
• and
• a flexible film disposed on a bottom surface of the first substrate, the flexible film being electrically connected to the fan-out line through the first contact hole, wherein
• an end of the flexible film is electrically connected to the fan-out line of the first display device, and
• another end of the flexible film is electrically connected to the fan-out line of the second display device.

A method of manufacturing a display device, comprising:

• providing a first substrate;
• forming a fan-out line disposed on the first substrate;
• forming a second substrate on the fan-out line;
• stacking a display layer on the second substrate;
• etching a surface of the first substrate through a first etching process and forming a residual layer of the first substrate;
• etching the residual layer of the first substrate through a second etching process to form a first contact hole of the first substrate;
• and
• inserting a flexible film into the first contact hole to electrically connect the flexible film to the fan-out line,
• wherein an etching angle of the first contact hole between a top surface of the first substrate and an inner surface of the first contact hole is about 10 degrees or less.