“…Backlighting is an important issue with LCDs and even more important for HMD designs based on LCDs. In general, backlights must be efficient (> 40 lumens/watt), produce high luminance (> 20,000 fL) (critical due to the pore through-put of LCDs), have high luminance uniformity (< 20% variation), have long life (>30,000 hours), and have a wide dimming range (> 5OOO:l) (Allen et al, 1995). Research is ongoing to achieve and/or exceed these requirements for military aviation applications (Altadonna, 1996;Jiang, 1996;Kalmanask and Sundraresan, 1996).…”