Optical: systems and elements – Holographic system or element – Using a hologram as an optical element
Patent
1993-05-26
1996-11-05
Sikes, William L.
Optical: systems and elements
Holographic system or element
Using a hologram as an optical element
359 40, 359 63, 359 78, 359631, 345 8, G02B 2702, G02F 11347
Patent
active
055723438
ABSTRACT:
A head-mounted see-through display which enables an outside image and an electronic image to be selectively observed by making a liquid crystal shutter transparent or opaque. To eliminate the problem that during the observation of the electronic image the outside image is undesirably seen through the peripheral region of the electronic image, display light from a two-dimensional display device (11) is first transmitted by a half-mirror (12), and the transmitted light is reflected by a concave mirror (13). Then, the reflected light is reflected by the half-mirror (12) so as to be led to the observer's eye as an enlarged image. To prevent the outside light from entering the eye through the half-mirror (12) during the observation of the electronic image, a negative or positive type TN or STN liquid crystal shutter (10) is disposed in front of the half-mirror (12). When the electronic image is to be viewed, the shutter (10) is made opaque, whereas, when the outside image is to be viewed, the shutter (10) is made transparent.
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Iba Yoichi
Kuba Keiichi
Okamura Toshiro
Shimada Naoto
Tabata Seiichiro
Duong Tai V.
Olympus Optical Co,. Ltd.
Sikes William L.
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