Optical: systems and elements – Holographic system or element – Using a hologram as an optical element
Patent
1989-05-25
1992-03-24
Hille, Rolf
Optical: systems and elements
Holographic system or element
Using a hologram as an optical element
359 63, 359 69, 359 70, 362 27, 362 31, 362 84, G02F 113
Patent
active
050993437
ABSTRACT:
A high contrast display is provided by illuminating a polymer dispersed liquid crystal (PDLC) display panel through opposite edges thereof. Light is scattered out the front of the panel from non-activated areas of the PDLC in which the refractive indices of the liquid crystal and polymer matrix materials are mismatched. For a direct view transmission mode display, the rear of the panel is blackened so that activated areas of the PDLC in which the refractive indices of the materials are matched transmit edge-illuminated and ambient light and appear black. For a reflection mode display usable in combination with projection optics, the rear of the panel is provided with a mirror surface, and ambient light is prevented from reaching the panel.
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Lackner Anna M.
Margerum J. David
Seiler Paul J.
Denson-Low W. K.
Duraiswamy V. D.
Hille Rolf
Hughes Aircraft Company
Tran Minhloan
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