Spectacle-type wearable display

A holographic spectacle-type wearable display (SWD) is proposed. In the pro posal, partial coherent illumination and large-off axis hologram are applie d to the optical layout in order to enhance resolution and simplify the opt ical system. The SWD bench model consists of six optical components, that i s, LED light source, graded index (GI) lens, pinhole, hologram, substrate ( spectacle glass), and test target. Here, the thickness of the spectacle gla ss 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, experimenta lly. Its value is enough resolution to display SXGA level. It is expected t hat the proposed optical system is useful as a wearable computer display un it. (C) 2000 Elsevier Science B.V. All rights reserved.