DISPLAY SYSTEM, MOBILE OBJECT, AND OPTICAL ELEMENT

A display system, a mobile object, and an optical element. The display system includes an optical device through which light diverges, a light deflector configured to scan a light emitted from a light source in a main scanning direction and a sub-scanning direction orthogonal to the main scanning direction to form an intermediate image on the optical device, and an imaging optical system configured to project diverging light diverging through the optical device to form an image. An effective diameter a of a mirror of the light deflector for the intermediate image and a ratio c of a size of an image formed by the imaging optical system to the effective diameter a satisfy a condition in an equation given below. 2≥0.007+0.75+0.5 The mobile object includes the display system, and the reflector is a front windshield. The optical element is used for the display system.