When a time grayscale method is used, it is an object to provide a display device in which the number of signal writings into a pixel can be reduced by dividing one frame period by the number of bits and power consumption can be reduced, and grayscale can be expressed. The vehicle wheel has an annular upper shell having a first wedge-shaped surface and composed of at least two upper segments. The at least one processor has a queue. It can be determined whether the service node is a destination hub. The invention can ensure both the authentication success rate and the authentication security.