- published: 10 Aug 2015
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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 origin of the name stems from a 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.
A typical HUD contains three primary components: a projector unit, a combiner, and a video generation computer.
The projection unit in a typical HUD is an optical collimator setup: a convex lens or concave mirror with a Cathode Ray Tube, light emitting diode, or liquid crystal display at its focus. This setup (a design that has been around since the invention of the reflector sight in 1900) produces an image where the light is parallel i.e. perceived to be at infinity.
The combiner is typically an angled flat piece of glass (a beam splitter) 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. Combiners may have special coatings that reflect the monochromatic light projected onto it from the projector unit while allowing all other wavelengths of light to pass through. In some optical layouts combiners may also have a curved surface to refocus the image from the projector.
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Got back out back off the forefront
i never said or got to say bye to
my boy but it's often i try i think
about how i'd be screaming and
the times would be bumping all our
minds would be flowing taking
care of shit like hey holmes what
you needing sometimes life will be
coming off whack and will open
your eyes as i proceed to get
loose i feel you next to me fiending
getting spacey with the common
love of music think of this as the
sun and the mind as a tool but we
could bounce back from this one
with attitude will and some spirit
with attitude will your spirit we'll
shove it aside soulfly fly high so
fly fly free when you walk into this
world walk into this world with
your head up high.