The 3D display technology involved in the large LED screen has become a new research field and direction. Using the principle of parallax, when the viewer watches the picture, as long as two sets of images with slightly staggered shooting positions are provided for the left and right eyes to watch respectively, they can see a set of three-dimensional pictures. Based on the principle of parallax, there are currently 4 methods to achieve 3D display, namely color separation, light separation, time-sharing and grating methods. How much is the LED large screen with 3D special effects

  First, the realization of color separation method of LED large screen Color separation technology is actually color difference 3D display technology. Use red-blue, red-green, brown-blue dichroic glasses (complementary color glasses) to realize the alternation and superposition of images viewed by both eyes, and stereoscopic imaging can be realized by viewing different images with both eyes. The main difference between dichroic glasses is the difference in lenses, and the requirements for the film source are the same as those for glasses. For example, red and blue glasses require red and blue film sources, and red and green glasses require red and green film sources. Brown-blue glasses require brown-blue film sources, and most of them are red and blue film sources. Taking red and blue glasses as an example, the red part of the image is sent to the left eye, and the blue part of the image is sent to the right eye, and then fused in the brain to form a stereoscopic image. Although the color separation method has many advantages such as simple implementation, low cost, and 2D to 3D conversion, the three color filters used in the 3D LED large screen of the LED display realized by this technology will reduce the image reaching the viewer's eyes. Brightness and specific color information. When viewing, the input information received by the left and right eyes cannot be balanced and consistent. Although the post-processing of the brain can recombine the information viewed by the two eyes, it will cause fatigue of the optic nerve, so the dichroic glasses cannot be long. time use. Due to the innate advantages of LED large screen in terms of brightness, this method is the easiest display method with 3D effect to realize.

  Second, the realization of the splitting method

  The principle of spectroscopic 3D display is similar to the principle of color separation, but spectroscopic display uses the directionality of light to filter out all light except polarized light at a certain angle by wearing polarizing filters or polarizers on the left and right eyes, so that part of the image light Only the left eye is entered, and part of the image light only enters the right eye. Through the polarized light in two directions on the LED display screen, two sets of pictures are output respectively, so as to realize the display of 3D effect. The viewer needs to wear polarized glasses for viewing, and the left and right lenses of the glasses can respectively allow the polarized light to pass in directions perpendicular to each other, thus achieving a stereoscopic effect of viewing images for the left and right eyes. However, when the spectroscopic technology is applied to the large LED screen, the existing problem is the generation of polarized light. Only by viewing two different images after polarized light through the left and right eyes, and allowing the respective polarized light to pass through the left and right lenses, can the different polarized light be passed through. The two images enter the left and right eyes respectively, and finally a stereoscopic image is synthesized through the visual system in the human brain. However, the spectroscopic technology also has obvious shortcomings. This technology has certain technical difficulties when it is applied to the large LED screen. The technical principle of the large LED screen determines that it is difficult for this screen to achieve two sets of polarized light in two directions. Image due to large LED screen