A liquid crystal display includes: a display area including: a first data line between a first pixel electrode and a second pixel electrode in a same pixel row, and connected to a first thin film transistor (“TFT”) and a second TFT, respectively; and a peripheral area including: a first parasitic capacitor capacity measuring unit including first gate capacity units and first data capacity units; a second parasitic capacitor capacity measuring unit including second gate capacity units and second data capacity units, where a relative arrangement between the first gate and data capacity units is the same as a relative arrangement between the gate and drain electrodes of the first TFT, and a relative arrangement between the second gate and data capacity units is the same as a relative arrangement between the gate and drain electrodes of the second TFT.