is there an option for leave screen on while charging ?

Activate Developer Options (by going to Settings/About Tablet and tapping Build Number 7 times). Then go to Settings/Developer Options, turn them on, and check "Stay Awake."

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I believe his point was that some screens may experience burn-in if left on for an excessive amount of time, especially without some kind of screensaver or Daydream on. If you don't have that Developer Option checked, the screen will still time out and go to sleep after the set period of time, even when plugged in..
 
It is suppose to, though in the past, suppose was not guaranteed. Just a word of caution or consideration.

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I just use an app called No Screen Off when I want my screen to stay on. Its free.

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