Why choose P3.91? 1.When the pixel come up to 2000000dots, the photo and video pixel is same from the video processor , so no difference from 3.91 and P3. 2. p3.91 With the special desogn on IC foot to Anti-collision 3.P3.91 Has the backup current wire, even one of power supply is broken, the display will be black off. 5. Flexible and super thin with 500x500mm size, east for installing