The 4th gen iPad uses an LED backlit "IPS" display.  These are indeed subject to image persistence per Apple (http://support.apple.com/kb/HT5455) as are all LCD displays.  Though the official line is that such images won't "burn in," if you are running only one app all the time "persistence" is effectively the same thing from a functional point of view.  

As for burning out the iPad electronics, sure, that's an issue, but I'm more worried about the screen persistence which will begin within days if the screen is static for hours every night with no visitor. I would prefer an automated routine for sleeping, but see no suggestion that this is possible without jailbreaking the iPad or attaching it to an external control computer. 

My intention with a screen saver would be to custom design the images to blank the screen for most of the time with a periodic "refresh" built in to eliminate ghosting. 

Cheers,
              tod

On Mar 11, 2013, at 12:40 PM, Jacob Hildebrandt wrote:

> Can/do you turn them off at night?  LCDs can suffer something like the burn-in we know from tube displays, but it is usually temporary and will go away when the device is left off or on a solid color for a few hours.  
> 
> Thermal wear and tear on the CPU and other chips from running all the time will kill the iPad before the screen shows any defects, I suspect.  
> 
> More about LCD "ghosting" here: http://en.wikipedia.org/wiki/Image_persistence  
> 
> 
> On Mon, Mar 11, 2013 at 11:59 AM, Kathryn Murano <[log in to unmask]> wrote:
> It's my understanding that LED screens do not require screensavers; people continue to have them because we're so used to them. If you want to be extra safe, try contacting Apple and see what they recommend.
> 
> Kathryn
> 
> 
> On Mar 8, 2013, at 1:04 PM, Museum discussion list wrote:
> 
> I am using Guided Access and standard Restrictions to configure iPads to run a single applications in a Kiosk environment.  All buttons will be blocked by casework.  I can lock down the applications thoroughly, but I have one problem I cannot find a solution for -- a "screen saver."
> 
> 
> In lock down mode, the kiosks will run a single app for 24/7/365 and I'm concerned the screens will burn-in (or "ghost") without some kind of screen saving routine: dimming, blanking, or a custom screen saver.  They will most certainly fail prematurely.
> 
> 
> Because the buttons are concealed, and a screen touch does not normally "wake" an iPad, I can't use built in sleep/dimming.  The visitor would have no way of waking the app.  I appears that  iOS "Screen Saver" applications don't run automatically so no help there. Mokitouch, Kiosk Pro, and X-stand all have screen save functions, but it appears that none of these can run a standard, non-web based iOS app.
> 
> 
> I've considered trying to use Apple Configurator to turn the iPads on and off remotely, but that means using a second computer connected via USB. Kinda overkill.
> 
> 
> Any ideas or pointers would be appreciated.
> 
> 
> Tod Hopkins
> Hillmann & Carr Inc.
> todhopkins-at-hillmanncarr.com
> 
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