The present invention discloses a 3D display device adopting a half-source driving structure. The 3D display device includes a liquid crystal display panel. Gate lines and data lines of the liquid crystal panel are crossed with each other and define multiple pixel regions. Each gate line is bent to have a plurality of arched portions that each arched portion corresponds in position to one pixel region and forms an accommodating area. A switching element in each one of the pixel regions is mounted in the corresponding accommodating area and connected to a pixel electrode. Because the accommodating areas formed by the gate lines can accommodate switching elements, light-exiting positions of the pixel electrodes in adjacent pixel regions can be in line with each other to avoid a color washout problem when the phase retarder film is mounted with a positional error.