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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.

A Vacuum Fluorescent Display (VFD's) is widely accepted as a superior display device because of its impressive self-luminance and high reliability. VFD's for automotive applications have been used to convert signals to visual digital information. Now, in addition to digital style images, analog image displays are being requested for a wider choice of style. Furthermore, bright and clear display appearance and additional function are feasible by adopting the VFD technology to a pointer display application like mechanical speedometers or tachometers. This paper discusses the development of the large scale analog pointer image VFD for automotive use.