A 2D/3D image displaying apparatus includes a sub-pixel, a first and second data lines and a gamma circuit. The sub-pixel includes a first portion and a second portion. The first and second data lines are coupled to the first and second portion of the sub-pixel, respectively. The gamma circuit transmits correlated gamma signals to a driving circuit for driving the first and second part of the sub-pixel via the first and second data lines when 2D image is to be displayed, and transmits a single gamma signal to the driving circuit for driving the first and second portion of the sub-pixel via the first and second data lines when 3D image is to be displayed.