PURPOSE: A three dimensional image displaying device is provided to improve the brightness of a 2D image and the vertical viewing angle of a 3D image without increasing the number of gate lines. CONSTITUTION: A main display part(MP) comprises a first pixel electrode(Ep1) and a first common electrode(Ec1) which form a first liquid crystal capacitor(C1c1). The first pixel electrode is connected to a data line(DL) through a first TFT(Thin Film Transistor)(ST1). The first TFT applies a data voltage of the data line to the first pixel electrode. A first storage capacitor(Cst1) regularly maintains a charging voltage of the first liquid crystal capacitor. An auxiliary display part(SP) comprises a second pixel electrode(Ep2) and a second common electrode(Ec2) which form a second liquid crystal capacitor(C1c2). A second storage capacitor regularly maintains a charging voltage of the second liquid crystal capacitor. A discharging control TFT(DST) responds to a discharge control voltage for switching a current path between the second pixel electrode and an upper common line.
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