(1) The display is installed in outdoor, often sun and rain, wind blowing dust cover, working environment is bad. The electronic equipment is wet or the serious damp may cause the short circuit or even the fire, causes the breakdown even the fire, caused the loss;
(2) The display may be affected by lightning caused by strong electric magnetic attack;
(3) The environmental temperature changes greatly. Screen work itself will produce a certain amount of heat, if the ambient temperature is too high and bad, the integrated circuit may not work properly, or even burned, so that the display system can not work properly;
(4) The audience is wide, the distance requirement is far, the field of vision is broad, the environment light changes greatly, especially may be subjected to direct sunlight.