In recent years the LED display industry has developed rapidly,and the LED car display also emerge at the right moment, the so-called LED car display is the LED display that installed on mobile vehicles used to display various kinds of information such as text, graphics, images, animation, market information, video, video signal, etc. Relative to the TV advertising on buses, there are advantages by using on-board LED display to achieve the mobile advertising playing that high brightness, large area, waterproof, sunproof and far away influence.