What does HUD display mean?

[Ethan]

HUD display refers to Head-Up Display. Below is relevant information about Head-Up Display: 1. Principle: HUD utilizes the principle of optical reflection to project crucial flight-related information onto a glass panel. This glass is positioned at the front of the cockpit, approximately at eye level with the pilot. The projected text and images are adjusted to an infinite focal length, allowing the pilot to seamlessly integrate the external view with the HUD-displayed data when looking forward. 2. Function: The purpose of HUD design is to enable pilots to maintain a heads-up posture without needing to look down at instrument displays, thereby reducing the risk of missing rapid environmental changes during transitions between looking down and up, as well as minimizing delays and discomfort caused by constant eye focus adjustments. 3. Content: The data projected by HUD primarily relates to flight safety, including altitude, airspeed, heading, vertical speed variation, aircraft bank angle, etc. In combat scenarios, it additionally incorporates target data, weapon and firing information, predicted impact points, etc. These displayed parameters can adapt according to different situations.