Optical see-through glass type display device and corresponding optical element

Abstract

An optical see-through glass type display device (100) comprises: an image projector (140) projecting a virtual image; a first optical element (130) configured to guide light of the virtual image; and a second optical element (120) having a first reflection surface (122a) for reflecting back light coming through the front surface of the second optical element (120) and a second reflection surface (124a) for retro-reflecting light coming through the rear surface of the second optical element (120). The second optical element (120) is switchable between a first state in which the reflection on the first and second reflection surfaces (122a, 124a) is enabled and a second state in which the reflection on the first and second reflection surfaces (122a, 124a) is disabled.

Dependencies are inferred from the claim text.