In order to keep your tablet always on without push the power button over and over again, you can consider enabling the "always on" function. For Andriod based tablets (like Samsung Galaxy TAB series) can be done by
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First, open the Settings.
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Secondly, find and choose About Device.
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Find and open Software Information.
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Locate Build Number and click hit it 7 times.
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The Developer Options appeared on the previous page.
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Go to Developer options and enable "Stay awake", once enabled the screen will never sleep while charging.
For Apple iOS devices like iPad -
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go to your iPad Settings
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choose "Display & Brightness"
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under Auto-Lock. Set Auto-Lock to "Never".