Three dimensional display device and method of driving the same

A three dimensional (3D) display device, comprising:

• a liquid crystal display panel;
• and
• an electroluminescence display panel behind the liquid crystal display panel;
• wherein the electroluminescence display panel comprises a plurality of first areas and a plurality of second areas, the first areas and the second areas are arranged in both of a row direction and a column direction;
• and the first areas serve as light emitting areas and the second areas serve as black areas in a 3D display mode;
• and
• wherein the liquid crystal display panel comprises a plurality of first sub-pixels arranged in an array;
• every at least two adjacent first sub-pixels in a row correspond to one of the first areas;
• and in the 3D display mode, among the first sub-pixels corresponding to an identical one of the first areas, the first sub-pixels for providing gray level information of an image for different viewpoints display different gray level information;
• wherein in the 3D display mode, in addition to providing backlight for the liquid crystal display panel, the electroluminescent display panel serves as a rear 3D grating with no extra 3D grating in front of the liquid crystal display panel.