Game Development Dictionary
Heads Up Display
This is a technique for imparting vital information to the player during gameplay, without requiring him to access a separate menu. The relevant information is simply overlaid on the game screen. This makes the information instantly available, without destroying the flow of the game itself. Typical examples of the Heads Up Display include the health bars common to Fighting games,and speedometers found in Racing games. While the Heads Up Display can help to support the game's pacing, it may also detract from the mood of a game. So it is important to make the Heads Up Display blend with the rest of the game as seemlessly as possible.