An embodiment of the present invention relates to an electrically-driven liquid crystal (LC) lens, which comprises: first electrodes, an electrode group arranged corresponding to each sub-pixel, and a liquid crystal layer disposed between the first electrodes and the electrode groups. Each electrode group includes a plurality of second electrodes; and where the voltages of the second electrodes in each electrode group are progressively increased or decreased from left to right sequentially, light passing through the sub-pixels is deflected to different directions. The electrically-driven LC lens can improve the resolution of 3D liquid crystal display. The embodiment of the present invention further discloses a display device and a 3D display method.