Patent ID: 7602552

Claim:
A head-up display system, comprising: a display device for generating and displaying information to an eye of an observer; a tilted power combiner for superimposing the information displayed by the display device onto the forward view of the outside by the eye of the observer, said tilted power combiner being devoid of holographic elements; and a relay optic assembly between the display device and the tilted power combiner for forming an intermediate image of the displayed information forwardly of the combiner that reflects the image towards the eye of the observer within an eye motion box to produce a large field of view for the observer; said relay optic assembly including: (i) a non-refracting spherical mirror generating aberrations in said intermediate image tending to compensate for aberrations produced by the tilted power combiner; and (ii) a non-refracting flat mirror spaced from said spherical mirror such as to receive reflections directly therefrom, wherein said flat mirror is spaced from said spherical mirror only by an air gap.