How much is the full-color 3D special effects LED big screen?

The 3D display technology involved in LED large screen has become a new research field and direction. By using the parallax principle, when a viewer views a picture, as long as two sets of images with slightly shifted shooting positions are provided for viewing by the left and right eyes, a group of three-dimensional images can be seen. Based on the principle of parallax, there are currently four methods to achieve 3D display, which are color separation, spectroscopic, time-sharing and grating methods. How much is the 3D special effect LED big screen?

First, the LED large-screen color separation method to achieve color separation technology is actually a color difference 3D display technology. The three-color separation glasses (complementary color glasses) of red, blue, red, green and brown are used to realize the alternation and superposition of the two-eye viewing images, and the different images are viewed through the two eyes to realize stereoscopic imaging. The main difference between the color-separating glasses is the difference in the lens, and the requirements for the film source are the same as those for the glasses. For example, red and blue glasses should be red and blue, and red and green glasses should be red and green. Brown-blue glasses should be brown and blue, and most of them are red and blue. Taking red and blue glasses as an example, the red part image is sent to the left eye, the blue part image is sent to the right eye, and then merged in the brain to form a stereoscopic image. Although the color separation method has the advantages of simple implementation, low cost, and 2D to 3D conversion, the three color filters used in the LED display 3D LED large screen can 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. Although the post-processing of the brain can recombine the information viewed by the eyes on both sides, it will cause fatigue of the optic nerve, so the color separation glasses cannot be long. Time to use. Due to the inherent advantages of LED large screen brightness, this method is the simplest display method with 3D effect.

Second, the realization of the spectroscopic method

The principle of splitting the 3D display is similar to the principle of color separation, except that the splitting display uses the directionality of the light to wear all the light other than an angle of polarized light through the polarizing filter or the polarizer. Only enter the left eye, part of the image light only enters the right eye. The two sets of images are respectively outputted by the polarized light in two directions on the LED display screen, thereby realizing the display of the 3D effect. The viewer needs to wear polarized glasses for viewing. The left and right lenses of the glasses can respectively allow the vertically polarized light to pass through each other in the direction, thus realizing the stereoscopic effect of viewing images by the left and right eyes. However, the spectroscopic technology is applied to the large LED screen. The problem is that the polarized light is generated. Only the two different images after the polarized light are viewed through the left and right eyes, and the two polarized rays are respectively passed through the left and right lenses to make different polarized rays pass through. The two images enter the left and right eyes respectively, and finally the images with stereoscopic effects are synthesized through the human brain visual system. However, the spectroscopic technology also has obvious shortcomings. The technology has certain technical difficulties when applied to LED large screens. The technical principle of LED large screens determines that it is difficult to achieve two sets of polarized light in two directions. Since the images of the LED large screen cannot be separated by superimposing together, so far, the polarizing technology cannot be applied to the LED large screen. How much is the 3D special effect LED big screen?

Third, the implementation of the grating method

The grating technology and the two previous technologies have great differences and have different implementation principles. According to the principle of parallax barrier, the image is arranged alternately by the elongated column grating and then by the two eyes. Since the longitudinal images entering the left and right eyes are separated by the parallax barrier, the left and right eyes are caused. The captured image produces a slight deviation, and finally achieves three-dimensional imaging in the brain. The specific implementation method is to realize the 3D display effect by vertically dividing the screen into a strip in the vertical direction by adding a parallel grid on the LED large screen, and the grid bar interlaces the left eye and the right eye image, such as an odd number display. The left-eye picture, the even-numbered bar displays the right-eye picture, and then the parallax barrier consisting of the grid bars in the vertical direction is set between the screen and the viewer, and the left and right eyes are seen by obscuring the line of sight outside the intersection of the two-eye line of sight. Different images to achieve a stereoscopic display. However, the stereoscopic display of the raster method has its own limitations. If the position of the viewer changes, the position of the parallax barrier also changes. At present, multi-view technology is used to solve this problem, and the use of this method does not affect the viewing effect, and is relatively simple to implement. At present, it is possible to use TN glass to cover the LED display screen, and to control whether or not to generate a grating by power-on, so that a 2D picture or a 3D picture can be displayed on one LED large screen. However, the grating also has its inherent disadvantages. If the two-view technology is used for the raster display, the horizontal pixels of the viewer's corresponding display will be halved. If multi-view technology is used, the horizontal pixels will become 1/N, so In this way, in order to achieve better image display quality, it is necessary to increase the display level pixels by a factor of two, which greatly increases the cost. How much is the 3D special effect LED big screen?

Fourth, time-sharing method implementation

The first three methods are external devices to achieve 3D stereo display, and the time-sharing method is to tap the potential of the display itself to achieve three-dimensional effects. This method plays the two sets of pictures alternately in a very short time, specifically, the LED large screen plays the picture into the left eye of the viewer when it is refreshed for the first time, while the viewer wears the glasses to cover the viewer. Right eye, swap the left and right direction the next time you refresh. The above two actions are continuously exchanged, that is, the two sets of shutter pictures are switched at high speed, and the continuous persistence 3D picture is finally formed by utilizing the visual persistence characteristic of the human eye and the synthesis of the brain. At present, widely used glasses are liquid crystal shutter glasses that can continuously block left and right eyes at high speed. This method requires high synchronization of the LED large screen and the liquid crystal shutter glasses. It is necessary to add a dedicated wireless transmitting device to synchronize the LED large screen and the liquid crystal shutter glasses. Time-sharing technology does not lose brightness due to the visual persistence characteristics of the human eye. At the same time, it relies on the high refresh rate capability of the LED large screen without major changes to the original LED large-screen system. As long as the signal synchronization device is added, the 3D effect can be perfected. Presentation, with low equipment acquisition and maintenance costs, is currently the dominant solution.

V. Comparison

In summary, the LED large screen effect using color separation and spectroscopic methods cannot meet the basic viewing requirements. Although the raster LED large screen can see stereo images without wearing glasses, there are certain requirements for the position of the viewer. The LED large screen that realizes 3D effect by using time-sharing technology has certain advantages in both display effect and cost performance.