Abstract
Generally a smaller angle of depression of the HUD could enhance perception of displayed image. However, it can not practically be applicable to automotive use. First this paper discusses the relation between perception of displayed image and angle of depression in automotive Head-Up Displays (HUDs). Second, we can point out a new serious problem, misconception of displayed information, if the angle is very small in practical HUDs. Lastly we describe what this stems from focusing on driver's eye movements through psycho physical experiments.
