Coping with bright sunlight was a major hurdle. Most commercial screen solutions can’t deliver the necessary brightness with the full color and high definition needed to support soldier applications, and commercial cell phone makers are generally focused on making screens bigger, rather than smaller. Thus, a substantial internal development effort was required to overcome the glare issue, Klager said.
Engineers also have pushed for a screen that could deliver data not just legibly, but accurately. “Say we take friendly-force information, which is a two-dimensional grid coordinate. We have to accurately display that in three dimensions, in the real world. That icon has to be accurate,” Klager said. “That is the big challenge in augmented reality, the geolocation of the augmented information. You can’t just display it.”
The team has leaned on digital terrain data, horizon matching and other advanced techniques to ensure the display data correlates correctly to information in the real world.
Finally, developers have worked to ensure that a micro-sized display will still be user friendly. When you’re trying to squeeze vital combat intel onto a very small screen, “it’s about displaying the right amount of information and displaying it effectively,” Klager said. “You have to make the displays user-configurable depending on the user function or preference. Say I was a driver: I’d want to have navigation information available, and perhaps close threats, but I don’t need to see long-range targets. If I were a gunner I’d want to see threats and friendly forces at all ranges,."

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