Optical device and head-mounted display using said optical devic

Details Optical device and head-mounted display using said optical devic Optical device and head-mounted display using said optical devic

1995-12-19

2000-07-25

Sikes, William L.

Liquid crystal cells, elements and systems

Liquid crystal system

Liquid crystal eyewear

349 98, 349115, G02F 11335

Patent

active

060942428

ABSTRACT:
The present invention provides a thin and light optical device for observing visual information with a large angle of visual field and a head-mount display (HMD) using the optical device. The optical device includes a refractor consisting of a refracting element with half-mirror coating and a circularly polarized light selecting semitransparent mirror, which are disposed in order from the incident side. The circularly polarized light selecting semitransparent mirror consists of a quarter-wave plate, a half-mirror and a polarizer or cholesteric liquid crystal, which are disposed in order from the incident side. A thin and high-magnification optical system is obtained by using the circularly polarized light selecting semitransparent mirror that first reflects incident light in a clockwise circularly polarized fashion and allows the counterclockwise circularly polarized light having made 1.5 round trips to pass therethrough without being reflected. A head-mount display (HMD) according to the present invention includes a liquid crystal display (LCD), a back light for the LCD and the above-mentioned optical device for magnifying an image of the LCD.

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"Aberration-corrected catadioptric magnifiers useful for simple microfiche readers" Pramana, vol. 22, No. 3&4, Mar. & Apr. 1984, pp. 213-220.
"High Isolation Polarization-Insensitive Optical Circulator for Advanced Optical Communications Systems", by M. Koga et al., Journal of Lightwave Technology, vol. 10, No. 9, Sep. 1992, pp. 1210-1217.
"Polarization Splitting of Opposing Waves in the Ring Laser" by V. P. Vasil'ev et al., Journal of Applied Spectroscopy vol. 10, No. 4, Apr. 1969 pp. 619-621.

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