Display substrate including a common buffer layer

A displaying substrate, a manufacturing method thereof, and a display panel. The displaying substrate includes: a first capacitor electrode at least partially located in luminous zones, a buffer layer covering the first capacitor electrode, and a second capacitor electrode and an active layer that are disposed on the buffer layer and do not overlap with each other, wherein the active layer is located in a non-luminous zone, and the first capacitor electrode, the buffer layer and the second capacitor electrode form a storage capacitor.