An optical sensor and a display apparatus. The optical sensor includes: a base substrate (1); a detection circuit (2) on the base substrate (1); a plurality of photosensitive devices (3) on a side of the detection circuit (2) facing away from the base substrate (1); a plurality of light converged elements (4) on a side of the photosensitive devices (3) facing away from the base substrate (1); where an orthographic projection of one light converged element (4) on the base substrate (1) covers orthographic projections of at least two photosensitive devices (3) on the base substrate (1); and a light constrained structure (5) between the photosensitive devices (3) and the light converged elements (4).