A head-up display is described. A spatial light modulator is arranged to display a diffractive pattern of first picture content and/or second picture content. A screen assembly has first and second diffusers arranged in a stepped configuration so that the first diffuser is spatially offset from the second diffuser by a perpendicular distance. A light source is arranged to illuminate the diffractive pattern such that the first picture content is formed on the first diffuser and/or the second picture content is formed on the second diffuser. An optical system comprising at least one optical element having optical power is arranged so that the first and second diffusers have different object distances to the optical system.

A head-up display is described. A spatial light modulator is arranged to display a diffractive pattern of first picture content and/or second picture content. A screen assembly has first and second diffusers arranged in a stepped configuration so that the first diffuser is spatially offset from the second diffuser by a perpendicular distance. A light source is arranged to illuminate the diffractive pattern such that the first picture content is formed on the first diffuser and/or the second picture content is formed on the second diffuser. An optical system comprising at least one optical element having optical power is arranged so that the first and second diffusers have different object distances to the optical system.

A head up display apparatus capable of suppressing discomfort to a user caused by an operating noise while preventing damage by sunlight is provided. Further, it contributes to Goal 3: Ensure healthy lives and promote well-being for all at all ages in the Sustainable Development Goals (SDGs). Thus, a video light projector 6 includes a drive mechanism 14 and projects video light emitted from a video display 11 to a display region 8, thereby making the projected video light visually recognized as a virtual image. A controller judges whether or not a door unlock signal which is one of information related to a transportation is received, and judges whether or not to cause the video display 11 to start displaying the video by operating the drive mechanism 14 in the video light projector 6 based on a display start condition when the door unlock signal is received.

A head up display apparatus capable of suppressing discomfort to a user caused by an operating noise while preventing damage by sunlight is provided. Further, it contributes to Goal 3: Ensure healthy lives and promote well-being for all at all ages in the Sustainable Development Goals (SDGs). Thus, a video light projector 6 includes a drive mechanism 14 and projects video light emitted from a video display 11 to a display region 8, thereby making the projected video light visually recognized as a virtual image. A controller judges whether or not a door unlock signal which is one of information related to a transportation is received, and judges whether or not to cause the video display 11 to start displaying the video by operating the drive mechanism 14 in the video light projector 6 based on a display start condition when the door unlock signal is received.