Spectacle-type wearable display

A holographic spectacle-type wearable display (SWD) is proposed. In the proposal, partial coherent illumination and large-off axis hologram are applied to the optical layout in order to enhance resolution and simplify the optical system. The SWD bench model consists of six optical components, that is, LED light source, graded index (GI) lens, pinhole, hologram, substrate (spectacle glass), and test target. Here, the thickness of the spectacle glass fabricated is about 5 mm. The resolution of its reconstruction image on the bench model is measured by using a CCD camera. The MTF measured on SWD bench model is not less than 0.5 in spatial frequency 40 lp/mm, experimentally. Its value is enough resolution to display SXGA level. It is expected that the proposed optical system is useful as a wearable computer display unit.