| 摘要 |
A private image display apparatus includes a display element that displays a picture, a projecting optical system that projects the picture, and a diffusive hologram screen that is disposed on the imaging position of a real image projected by the projecting optical system and that has a predetermined directionality. The private image display apparatus is configured to satisfy the condition 0.01<Y/D<2.7, to thereby introduce the picture displayed on the display element exclusively into the pupil of an operator without introducing it into a person other than the operator, where D is a distance from the diffusive hologram screen to the eye of the operator and Y is a diameter of an observable region.
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