Display apparatus with insulating pixel separation layers buried in trenches of different insulating layers

A display apparatus comprising:

• a substrate defining a first area and a second area, the first area comprising a plurality of first pixel areas arranged in a first direction and a second direction and a plurality of first separation areas disposed between first pixel areas of the plurality of first pixel areas disposed adjacent to each other in the first direction, and the second area comprising a plurality of second pixel areas arranged in the first direction and the second direction;
• a first insulating layer disposed on the substrate and having a plurality of first trenches and a plurality of second trenches, the plurality of first trenches being arranged in the first direction and corresponding to boundaries between first pixel areas of the plurality of first pixel areas arranged in the first direction and the plurality of first separation areas, the plurality of second trenches being arranged in the first direction and corresponding to boundaries between second pixel areas of the plurality of second pixel areas arranged in the first direction;
• a plurality of first separation layers buried in the plurality of first trenches and including a material that is different from a material of the first insulating layer;
• and
• a plurality of second separation layers buried in the plurality of second trenches and including a material that is different from the material of the first insulating layer,
• wherein:
• the substrate further defines a folding area including the first area and the second area, and a non-folding area, and
• the display apparatus further comprises a support layer disposed below the substrate, the support layer comprising a first support portion comprising a slit corresponding to the first area of the folding area and a rib corresponding to the second area of the folding area, and a second support portion corresponding to the non-folding area.