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Message: <blockquote data-quote="tery123" data-source="post: 22042975" data-attributes="member: 343391">Head-Up Display - How It WorksHUD projector sends flight, navigation and aircraft energy-management data to a glass screen, called a combiner.It displays airspeed, altitude, heading, course, and flight-path The concave-shaped combiner glass is coated with a proprietary material that reflects the color green but allows everything else, such as the scenery outside.The HUD projector contains a backlighted liquid-crystal display as the light source to aim the flight data at the combiner screen. The LCD aims the information forward, focusing it through a series of multiple relay lenses aligned nonsymmetrically. As the light hits the combiner glass, the rays of light are forced to align themselves in parallel rows to an infinite point in space, that prevents the pilot from needing to refocus his eyes as he peers through the screen. That alignment of the light is referred to as collimation.Ref: Flying Magazine<img src="http://i63.tinypic.com/12554wn.jpg" alt="" class="fr-fic fr-dii fr-draggable " style="" />source :AeroChapter</blockquote>

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