With the continuous development of science and technology, LED ascending and descending screen, as a modern display device, plays an increasingly important role in a variety of occasions, through the application of LED ascending and descending screen, can be more intuitive, vivid display of a variety of information, to improve the efficiency of the transmission of information and the audience's acceptance. However, we use the LED automatic lifting screen in the process, for various reasons, sometimes lead to the occurrence of display position distortion. Then you know...