Optical: systems and elements – Single channel simultaneously to or from plural channels – By partial reflection at beam splitting or combining surface
Patent
1996-12-03
1998-02-03
Nelms, David C.
Optical: systems and elements
Single channel simultaneously to or from plural channels
By partial reflection at beam splitting or combining surface
G02B 2714
Patent
active
057150940
ABSTRACT:
A helmet/head mounted display including a display image source and a reflective visor for each eye. The image source includes a fiber optic cover plate with a planar input surface and a curved output surface which has curvature providing the correct curvature. The image source further includes a self-emitting device such as a field electrode display or electroluminescent device, or a polymer dispersed liquid crystal (PDLC) sandwiched between a thin, sharply tapered fiber optic plate and the fiber optic cover plate. For the PDLC image source, back light illumination is introduced through the tapered fiber optic plate, passes through or is scattered by the PDLC and then through the fiber optic face plate to the visor, for reflection to the observer's eye. The fiber optic face plate is constructed with a very low numerical aperture. The fibers of the cover plate are oriented toward the eye as seen in the reflection from the visor to reduce undesirable reflected light. No lenses or beam splitters are in the light path between the image source and the visor.
REFERENCES:
patent: 4026641 (1977-05-01), Bosserman et al.
patent: 5299063 (1994-03-01), Fritz et al.
patent: 5303085 (1994-04-01), Rallison
"Parameters in FED Product Design," F. Courreges, SID '96 Digest, pp. 45-48 .
Ansley David A.
Chen Chungte W.
Hegg Ronald G.
Denson-Low Wanda K.
Hughes Electronics
Nelms David C.
Robbins Thomas
Sales Michael W.
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