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Vacuum Fluorescent Displays for Head Up Display (HUD) systems typically have a luminance of 20,000∼30,000 cd/m2. Certain HUD users have identified a need for a low cost HUD with a projected luminance of 10,000 cd/m2. We have studied an electrode structure modification with the objective of realizing a luminance of 10,000 cd/m2 at battery voltage, which will allow for a cost reduction of the HUD system.

Vacuum Fluorescent Displays (VFDs) which can be directly driven at battery voltage have proven their suitability in automotive applications. In addition to green emitting phosphor, other phosphors such as yellowish orange, greenish yellow and most recently reddish orange have been developed to operate at vehicle battery voltage. These phosphors are now readable under direct sunlight conditions. This paper presents the recent technical improvements that were accomplished to add reddish orange to the list of battery voltage phosphors.