Pixel array substrate

A pixel array substrate, comprising:

• a substrate;
• an insulation layer disposed on the substrate;
• and
• a plurality of pixel structures disposed on the substrate, and each comprising:
• an active device disposed between the substrate and the insulation layer;
• and
• a reflective layer disposed on the insulation layer, and comprising:
• a silver-based reflective layer having a reflective surface;
• and
• a buffer layer disposed between the insulation layer and the silver-based reflective layer, wherein a material of the buffer layer comprises a conductive material,
• wherein the insulation layer has an opening and a side wall surface defining the opening, the silver-based reflective layer and the buffer layer extend to cover the side wall surface of the insulation layer, and a first thickness of a side wall portion of the buffer layer covering the side wall surface along a normal direction of the side wall surface is greater than or equal to 30 angstroms and less than or equal to 80 angstroms.