A highly efficient two-dimension/three-dimension switchable display device is provided to improve light efficiency and reduce power consumption by reducing a thickness of a liquid crystal layer and refractive power of an optical lens. A highly efficient two-dimension/three-dimension switchable display device includes a display unit(100) and a switching field separation unit. The display unit forms an image. The switching field separation unit switches the image formed by the display unit to a two-dimensional image or a three-dimensional image. The switching field separation unit has a lens array(200) and a liquid crystal lens(300). The lens array separates a field of the image formed by the display unit. The liquid crystal lens has controllable refractive power to offset or reinforce refractive power of the lens array.
