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The main reason for using a collimated display in HUD is ________

(a) More information can be displayed

(b) Wide view of display

(c) Information displayed is focused at infinity

(d) Fast screen refresh rates

This question was posed to me during a job interview.

This intriguing question originated from Head Up Displays topic in division Displays and Man-Machine Interaction of Avionics

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Right choice is (c) Information displayed is focused at infinity

Explanation: A collimated display is a display in which the rays of light emitted/reflected is parallel to the display. Since the rays of light are parallel, its focus is at infinity, thus the pilot is able to view the information on the HUD without changing his focus from the outside world scene without parallax error. Also, the ray of light from a collimated display would not disperse with distance.

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