Optical: systems and elements – Holographic system or element – Using a hologram as an optical element
Patent
1994-02-01
1996-07-09
Sikes, William L.
Optical: systems and elements
Holographic system or element
Using a hologram as an optical element
359 42, 359 70, 359631, 359 41, 385901, G02F 11335
Patent
active
055350259
ABSTRACT:
An optical arrangement that provides a telecentric helmet mounted display optical system. The optical arrangement comprises an image source including a faceplate wedge attached to a liquid crystal display, such as an active matrix liquid crystal display, for example, that is illuminated with collimated fight. The output image is used as a light source for an off-axis or on-axis reflector used to produce an output image. The faceplate wedge corrects the anamorphic distortion exhibited in the off-axis reflector and directs the light energy into the off-axis entrance pupil of the reflector to maintain high uniformity over the exit pupil without sacrificing brightness. More particularly, the present invention comprises the input light source, and the liquid crystal display that is illuminated with collimated light from the light source. The faceplate wedge is optically coupled to the liquid crystal display, and the reflector is optically coupled to the faceplate wedge for producing an output image. The faceplate wedge corrects for anamorphic distortion exhibited in the reflector and directs light energy into an off-axis entrance pupil to maintain high uniformity over the exit pupil without sacrificing brightness. The reflector may comprise an off-axis or on-axis portion of a parabolic reflector. The optical arrangement may further comprise a collimating lens disposed between the liquid crystal display and the input light source. The collimating lens may comprise a Fresnel lens. In an off-axis version, the optical arrangement may further comprise first and second planar reflectors disposed between the input light source and the collimating lens, and a negative lens optically coupled to an output surface of the faceplate wedge. In an on-axis version, the optical arrangement may further comprise a beamsplitter optically coupled between the faceplate wedge and the reflector.
REFERENCES:
patent: 4195915 (1980-04-01), Lichty et al.
patent: 4787711 (1988-11-01), Suzuki et al.
patent: 4799765 (1989-01-01), Ferrer
patent: 5329386 (1994-07-01), Birecki et al.
Denson-Low Wanda K.
Hughes Training, Inc.
Sikes William L.
Trice Ron
Walder Jeannette M.
LandOfFree
Helmet mounted off axis liquid crystal display with a fiber opti does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Helmet mounted off axis liquid crystal display with a fiber opti, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Helmet mounted off axis liquid crystal display with a fiber opti will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-1871890