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Modern LCDs are not immune to image retention, it's just unlikely to happen in regular domestic use.
I've some ~2 year old Samsung LCDs get burn in of the no signal message - Even though the firmware moves the message box around the screen there are a limited number of positions used and it eventually burns into all of them. These are sets that are left on 24/7 connected to games consoles in a lounge area - When the place is empty and no one is playing they just sit there displaying the "no signal" message for hours and hours. The consoles go into standby when not used, but whoever installed the sets did not set them to go into standby when there is no signal - probably because while you can wake up the console by pressing a button on the controller there is no way for someone to wake up the TV that is mounted behind glass.
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