Vacuum Fluorescent Display Design Considerations for Head-Up Display Systems

The Ultra High Luminance Vacuum Fluorescent Display (UHL-VFD) has been brought into practical use for the automotive Head Up Display (HUD) system. To obtain ultra high luminance, the basic characteristics of the UHL-VFD were thoroughly analyzed. This resulted in the utilization of the self standing grid and the optimization of the electrode structure and driving condition. Studies of thermal properties suggest the possibility of a more efficient ultra high luminance display system. Reduction of luminance caused by the thermal quenching of phosphor could be minimized by the use of a heat sink. UHL-VFD's having various colored phosphors were test manufactured and were proven to have sufficient life.