A thin film transistor array panel is provided, which includes a gate line, a data line intersecting the gate line, a storage electrode apart from the gate and data lines, a thin film transistor connected to the gate and data lines and having a drain electrode, a pixel electrode connected to the drain electrode, a first insulating layer over the thin film transistor and disposed under the pixel electrode, and a second insulating layer disposed on the first insulating layer and having an opening exposing the first insulating layer on the storage electrode.