A unipolar gray scale drive scheme for passive matrix displays, more specifically, cholesteric liquid crystal displays, capable of creating any number of desired levels of gray scale. A mounting boss is integrally formed to a rear side outer panel, thereby reducing a vehicle’s weight and improving the assembly process and maintenance of the vehicle. An interface in communication with the ports is configurable as to the network layer, or layer 2 and 3, and the physical layer, or layer 1.