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| C-130J_Co_Pilots_Head-up_display |
A head-up display or heads-up
display—also known as a HUD—is
any transparent display that presents data without requiring users to look away
from their usual viewpoints. The pilot
being able to view information with the head positioned "up" and
looking forward, instead of angled down looking at lower instruments.
Although they were initially
developed for military aviation, HUDs are now used in commercial aircraft,
automobiles, and other applications.
COMPONENTS
·
PROJECTOR
·
COMBINER
·
VIDEO GENERATION COMPUTER.
PROJECTOR:-
IT CONSIST OF CONVEX LENS or CONCAVE
MIRROR with a Cathode Ray Tube, light
emitting diode, or liquid crystal display at its focus.
This produces an image where the light is parallel
COMBINER
The
combiner is typically an angled flat piece of glass located
directly in front of the viewer, that redirects the projected image from
projector in such a way as to see the field of view and the projected infinity
image at the same time.
COMPUTER
The
computer provides the interface between the HUD (i.e. the projection unit) and
the systems AND data to be displayed .COMPUTER
generates the imagery and symbology by the projection unit .
Generations
HUDs
are split into four generations reflecting the technology used to generate the
images.
§
First Generation—Use a CRT to
generate an image on a phosphor screen, having the disadvantage of the phosphor
screen coating degrading over time. The majority of HUDs in operation today are
of this type.
§ Second Generation—Use a solid state light source, for
example LED, which is modulated by an LCD screen to display an
image. These systems do not fade or require the high voltages of first
generation systems. These systems are on commercial aircraft.
§ Third Generation—Use optical waveguides to
produce images directly in the combiner rather than use a projection system.
§ Fourth Generation—Use a scanning laser to display images and
even video imagery on a clear transparent medium.
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