Thin film transistor array panel having improved storage capacitance and manufacturing method thereof

A thin film transistor array panel, comprising:

• a gate line;
• a data line intersecting the gate line;
• a semiconductor disposed under the data line;
• a thin film transistor connected to the gate line and the data line and having a drain electrode;
• a first insulating layer disposed on the data line and comprising an organic material;
• a pixel electrode disposed on the first insulating layer and connected to the drain electrode;
• a shielding electrode disposed in the same layer as the pixel electrode and transmitting a common voltage, the shielding electrode comprising a first portion extending along the data line and covering the data line.