It is an object to provide a display that can reliably shield visible light in the entire wavelength regions when viewed from an oblique direction and a viewing angle control element used for the display. The electric motor includes an input terminal configured for coupling with a relay that includes contacts that are electrically coupled when closed and separated by an air gap when open. When demand falls below the allocation, the region releases bandwidth so other regions can take advantage of that bandwidth. Through the actuator, the driving gear and the driven gear match tightly in the normal state to eliminate the backlash during positioning. The edge bushing arranged between the dome of the chamber body and the plasma source coil, and is configured in the form of a cylindrical shape to overlap with an edge of the wafer arranged in the reaction space.