An eco-drive assist apparatus displays a quantity of eco-drive that indicates a degree of ecology andor economy in driving in a hybrid vehicle equipped with an engine and a motor. The imaging device has pixels which are arranged in a first direction. The transmission regions correspond to portions of the bottom surface of the second substrate that do not have the reflection layers. The piezo aerosol apparatus generally defines a non-symmetric compound, while the ultrasonic atomizer comprises a piezo component and metal plate of substantially the same diameter in length.