LED signs could soon hide secret messages

- Aug 30, 2018-

The system has great potential for sharing messages with a select group of people or a single person without anyone else being the wiser. But it does have limitations. For a single LED, range is limited to a few inches. Lasers would have a longer range, but the beam needs to hit the receptor to work (and a laser beam shooting around an area isn't exactly covert).

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