Optical: systems and elements – Single channel simultaneously to or from plural channels – By partial reflection at beam splitting or combining surface
Patent
1993-12-09
1996-06-11
Epps, Georgia Y.
Optical: systems and elements
Single channel simultaneously to or from plural channels
By partial reflection at beam splitting or combining surface
359631, 359495, 359496, G02B 2714, G02B 530
Patent
active
055261841
ABSTRACT:
A head-mounted display apparatus designed so that the utilization efficiency of display light from an image display device is increased and it is possible to control the brightness of an outside, real world image and also possible to shut off light from the outside. A liquid crystal display device (2) is disposed so that the direction of polarization of light emerging from the liquid crystal display device (2) is parallel to the plane of incidence on a polarization beam splitter (5) disposed in front of an observer's eye. The light emerging from the liquid crystal display device (2) is transmitted by the PBS (5) and reflected by a concave mirror (3) through a quarter-wave plate (6) disposed on the exit side of the PBS (5). The reflected light passes through the quarter-wave plate (6) and enters the PBS (5) again. Since the display light passes through the quarter-wave plate (6) twice during the round-trip travel, almost all the display light is reflected by the PBS (5) to enter the observer's eye. Accordingly, the light emerging from the liquid crystal display device (2) reaches the observer's eye with substantially no loss of light. With regard to light (4) from the outside world, a half of the incident light is reflected by the PBS (5), and the other half reaches the observer's eye.
REFERENCES:
patent: 3508809 (1970-04-01), Wilder
patent: 3677621 (1972-07-01), Smith
patent: 4007979 (1977-02-01), Coblitz
patent: 4963003 (1990-10-01), Hiiro
patent: 5220454 (1993-06-01), Ichihara
patent: 5223956 (1993-06-01), Kramer
patent: 5383053 (1995-01-01), Hegg
Imai Satoshi
Tochigi Akiyoshi
Tokuhashi Yuki
Epps Georgia Y.
Mack Ricky
Olympus Optical Co,. Ltd.
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