Service Advantage Media CD CD-Yu Yu is committed to providing our customers with comprehensive quality services, a 24 * 7 service system, the company has 400 Commissioner customer service, and professional and technical personnel to provide professional and technical support services. If the thumb-sized advertising spots appear on the LCD screen, why not? If daily use is largely due to external forces pressing spots caused. In the external oppression of LCD advertising panel, a polarizer will be deformed, this property similar polarizing foil, after being pressed into it does not automatically bounce back, thus forming a LCD advertising panel when there is a difference in reflection, there will be dark side This problem is easy to find in black and white, thumb size range generally does not affect the normal use of the LCD advertising display, but in the course should pay more attention to avoid hand to press the LCD advertising screen.