Flicker-free directional backlight naked-eye 3D display device for multi-person viewing

A flicker-free directional backlight naked-eye three-dimensional (3D) display device for multi-person viewing, comprising:

• an image control module, a human eye tracking module, a directional backlight module, a light shaping film layer, a display unit, and a triangular prism-shaped microstructural directional beam-splitting film,
• wherein the triangular prism-shaped microstructural directional beam-splitting film covers and is pasted on the display unit,
• wherein the image control module converts image data into a 3D image, and the image control module is connected to the directional backlight module, the human eye tracking module, and the display unit respectively, extracts a human eye position signal collected by the human eye tracking module, synchronously sends the human eye position signal to the directional backlight module, and controls display output of the display unit,
• wherein the directional backlight module comprises several backlight units, a light beam emitted by each backlight unit is shaped into a directional light beam through the light shaping film layer, the directional light beam loads an image through the display unit and are split through the triangular prism-shaped microstructural directional beam-splitting film,
• wherein the 3D images displayed by the display unit comprise a left-eye parallax image and a right-eye parallax image, and odd columns and even columns of the display unit display the left-eye parallax image and the right-eye parallax image respectively,
• wherein the triangular prism-shaped microstructural directional beam-splitting film comprises several triangular prism array units, each triangular prism array unit is corresponding to two columns of pixels and covers both a left-eye parallax image display pixel and a right-eye parallax image display pixel, and the 3D images displayed by the display unit are projected through the triangular prism-shaped microstructural directional beam-splitting film and then incident into left and right pupils of different viewers,
• wherein each backlight unit is composed of a plurality of light-emitting diode (LED) light bars with different spacings from the light shaping film layer, the LED light bars are combined to form a polygonal structure, the polygon is formed by fitting a free curve of a focal plane of a lens unit, and an entire display area in which the viewer is located is illuminated by LED light bar combinations in different backlight units,
• the human eye tracking module comprises a binocular infrared camera and an infrared light supplementing light assisting the binocular infrared camera, the binocular infrared camera captures a face picture of a viewer and transmits the face picture to the image control module, the image control module analyzes and processes the face image, and then controls, based on an analysis result, the directional backlight module to light up LED light bars corresponding to the viewer,
• if the images are viewed only by a single viewer, the backlight unit only needs to light up and turn on a group of LED light bars corresponding to a pupil of the viewer, and each group of LED light bars comprises a plurality of columns of light bars;
• if the images are viewed by N viewers, the backlight unit needs to light up and turn on N groups of LED light bars corresponding to pupils of the N viewers, and
• when the backlight unit lights up and turns on a plurality of columns of LED light bar combinations to emit light beams, the emitted light beams are shaped into directional light beams through the light shaping film layer, and the half-height width of an image formed at a viewing position of the viewer is not greater than an interpupillary distance S of the viewer.