Visual display unit, head mount display and head up display

摘要

The visual display unit has, the illuminant and the indicating element and ocular optical system (14) with. Light of the wave length width where as for the illuminant, luminous peak wave length exists one at least, at the same time, includes one luminous peak wave length radiation is done. The indicating element, modulating the light which radiation is done from the illuminant, indicates image. Ocular optical system (14), making diffract making reflect image light from the indicating element, HOE of reflected type (23) it has possessed with the cubic measure phase type which it leads to the observation pupil. For example the HOE aspect (23a), in order to become with concave on observation pupil side, the plural plane surfaces which are arranged (1st plane surface (31), 2nd plane surface (32), 3rd plane surface (33))We are divided, in order to possess the ridge which to the boundary of the plane surface which is adjacent is common, we continue the above-mentioned plural plane surfaces.