The present disclosure provides a display device and display method. The display device includes: a first display structure and a second display structure. The second display structure is disposed on a first light exiting side of the first display structure. A quantum rod layer that is disposed on a second light exiting side of the second display structure. The first display structure is configured to convert an incident blue light ray into a linearly polarized blue light, and control a luminance of the first display structure by controlling a deflection angle of liquid crystal of the first display structure. The second display structure receives the linearly polarized blue light that exits from the first display structure, and changes polarization state of the linearly polarized blue light incident to the quantum rod layer by controlling deflection angle of liquid crystal of the second display structure, to in turn change a color of the light ray that exits from the quantum rod layer.