Near-eye holographic display device by simple optical system using HOE

摘要

A Head-mounted displays (HMD) for augmented reality (AR) are researched to use work support. However,it has a fatigue problem occurred by the difference of focal length between the working space and displayedimage. The technique of displaying holography using an electronic device called electro-holography are expectedto solve the problem, because it is possible to display images at a free depth depending on the working position.So that, holographic HMDs for AR have been studied. But, since it is consisting optical components such aslenses, a mirror and a half mirror, the size and weight of the devise become large and heavy. On the other hand,holographic optical elements (HOE) is possible to produce functions of lens, beam splitter and diffraction grating.Also, it is possible to consolidate the functions of lenses and half mirrors into HOE. In this paper, we purposenear-eye holographic display device using HOE (Egarim-PBS made by Egarim Co., Ltd.). The Egarim-PBS isconsolidated the functions of lenses, half mirrors, and optical waveguide, which are all optical components toconstruct the holographic HMD. So that, we can perform a simpler optical structure which is only consists of anEgarim-PBS and electronic devices. Our proposed concept was proven by experimentally. The proposed systemhas a potential to make holographic HMD became smaller and lighter than a conventional holographic HMD.