A motorcycle includes liquid crystal display device with a liquid crystal panel and a back light source, a main controller which receives predetermined inputs pertaining to a current operating state of the vehicle or to a rider's intended operations of the vehicle, and a sub-controller for controlling the back light source. The sub-controller is configured to switch the back light source from a normal output state to a low output state if none of the predetermined inputs are inputted to the main controller for at least a predetermined time period, and to switch the back light source back to the normal output state if at least one of the predetermined inputs is inputted to the main controller when the back light source is in the low output state. The predetermined inputs correspond to the rider's operation of control members of the saddle type vehicle when riding.