Philips' Interactive LED Installation at Arkansas Children's Hospital
Philips has installed this playful LED wall at Mercy Medical Center in Rogers, Arkansas. An array of 1,420 touch-sensitive panels change colors every time they are tapped, capable of registering up to six discrete participants at a time.
If you want to get an idea of what it's like, Gadget Lab's Rob Beschizza made a Flash version. I spent several minutes playing around with the array, adding my own blooping and bleeping sound effects while pretending I was about to give birth.
Paint LED Art With Philips' Giant Light Canvas [Gadget Lab]

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I'm not sure if your headline is entirely accurate.
There actually is an Arkansas Children's Hospital in Little Rock, but the hospital you're referring to is in northwest Arkansas, 200+ miles away.
Then the thought struck me that you might be referring generically to *an* Arkansas children's hospital, so I thought I'd mention that there actually *is* a hospital with that specific name.
touch sensitive led display in hospital = vector for disease transmission