Naked-eye 3D backlight module, naked-eye 3D display device, and naked-eye 3D display method

A naked-eye 3D display device, comprising:

• a light emitting diode (LED) sequential circuit board comprising a plurality of sets of LED backlight sources, wherein each of the sets of the LED backlight sources comprises n LED units, wherein n is an even integer greater than or equal to 4;
• a plurality of convex lenses provided in one-to-one correspondence with the LED units, wherein each of the convex lenses is configured to converge a light beam emitted from a corresponding LED unit of the LED units into a parallel light beam, and the parallel light beams converged by all the convex lenses are oriented in a same direction;
• a plurality of polygonal prisms provided in one-to-one correspondence with the sets of the LED backlight sources, wherein each of the plurality of polygonal prisms has n refracting sides and is configured to refract the parallel light beams oriented in the same direction after passing through the convex lenses into n parallel light beams respectively oriented in n directions;
• a thin film transistor liquid crystal display (TFT-LCD) having a refresh frequency the same as a sequential frequency of the LED backlight sources and configured to control transmissions of the n parallel light beams respectively oriented in the n directions after passing through each of the polygonal prisms;
• and
• a multiple-viewing-angle parallax barrier configured to form the n parallel light beams, which are respectively oriented in the n directions after passing through the TFT-LCD, into an n-viewpoint area display in space.