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http://venturebeat.com/
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http://venturebeat.com/2009/03/17/samsung-starts-making-new-kind-of-indoor-displays/
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VentureBeat: Samsung starts making new kind of indoor displays

Tommy · 9 months ago

Most commercial grade digital signs use 3rd party software that power down systems when not in use in off hours. Maybe they are embedding hardware/software in the screens.
Alex · 8 months ago

I would say they definitely are. You buy any high end display and it will have its own hardware and software.
Jack · 6 months ago

A photoreactive material in the display could in theory capture an image projected onto it from behind, then all is needed to light the "photo" would be a bulb behind it. That could only consume the power of a normal lightbulb, maybe 40 to 80 watts.