Head-up display apparatus for vehicular display

摘要

A head-up display apparatus used as an instrument display of an automobile comprises a hologram combiner provided on the front windshield on which an image is displayed overlapping the field of view. The apparatus includes a display luminosity control system which varies the brightness of the display image gradually or delays an increase and decrease in the brightness in accordance with variations in the ambient light level so as to allow a driver's eyes to adapt to the variations.