Display device and method for manufacturing thereof

A display device comprising:

• a substrate having a display area, and a non-display area surrounding the display area, and comprising:
• an edge;
• an upper surface having an edge area in which a processing trace remains adjacent to the edge;
• a bottom surface opposite to the upper surface;
• a side surface connected to the upper surface and not parallel thereto;
• and
• a first inclined surface connected to the side surface and to the bottom surface and not parallel thereto;
• a light-emitting element layer above the upper surface of the substrate in the display area, and comprising light-emitting elements;
• an encapsulating layer above the light-emitting element layer and corresponding to a portion of the display area and the non-display area;
• and
• a protective layer above an outer surface of the substrate, located on at least one of the bottom surface, the side surface, or the first inclined surface, and comprising a first protective layer on the bottom surface of the substrate, and a second protective layer on the first inclined surface of the substrate.

A method for manufacturing a display device, the method comprising:

• preparing a mother substrate;
• forming display cells above one surface of the mother substrate;
• forming a cutting line along a periphery of the display cell, and forming a processing mark on the one surface of the mother substrate, by irradiating a laser from another surface of the mother substrate that is opposite to the one surface of the mother substrate;
• separating a substrate on which the display cells are formed by etching the mother substrate along the cutting line;
• and
• forming a protective layer on at least one of a bottom surface of the separated substrate, a side surface of the separated substrate, or a first inclined surface of the separated substrate that is connected to, and not parallel to, the bottom surface and the side surface, the protective layer comprising inorganic polysilazane or organic polysilazane.