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Welcome to visual world
Prepare by Carl Lin
With HUD Technology
Original
For Now
Future
Original
Definition
Structure
History
Definition – Why we call it HUD
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. ---- from wiki
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.
History – comes from and development
Structure – Key elements of HUD
A typical HUD contains three primary components:
projector unit
combiner
video generation computer
Structure – Projector
The projection unit in a typical HUD is an optical collimator setup: a convex lens or concave mirror with a CRT, LED, or LCD at its focus. This setup produces an image where the light is collimated, i.e. the focal point is perceived to be at infinity.
Refractive
Diffraction
Imaging Distance Control
Structure – Combiner
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.
Imaging Mixed
Reflective Plate
Reflective Film
Full Windshield
Applications
Technical
For Now
Applications – Modern HUD Extensions
Automotive – HUD in vehicle
These displays are becoming increasingly available in production cars, and usually offer speedometer, tachometer, and navigation system displays. Night vision information or Safety guides is also displayed via HUD on certain automobiles
Technica
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