Optical: systems and elements – Holographic system or element – Using a hologram as an optical element
Patent
1994-10-14
1996-06-25
Gross, Anita Pellman
Optical: systems and elements
Holographic system or element
Using a hologram as an optical element
2502011, 250205, G02F 11335, G01J 120, G01J 132
Patent
active
055305725
ABSTRACT:
An electronically controlled visor that includes a panel composed of a number of liquid crystal pixels that act as shutters to attenuate offending light sources. The pixels are driven by an electronic control unit that in turn is driven by light sensor assemblies that detect the angle of incidence of the offending radiation. A correlation exists between the elements of the light sensor that are activated and the pixels that end up being energized, changing their opacity, as a result of detecting the offending light source so that the latter can be attenuated. A bias adjustment control circuit adjusts the level of light that is to be considered offending (damaging or distracting to a user). Sections of the panel comprising several pixels can be activated together, or in non-contiguous patterns in order to optimize the effectiveness of the attenuation with a minimum of peripheral unneeded attenuation of neighboring pixels.
REFERENCES:
Custom Liquid Crystal sales information (4 pages), UCE, Inc., Nov. 15, 1993.
Gross Anita Pellman
Malinowski Walter J.
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