When the tablet goes to sleep, it shows a "sleeping" screen on the display. It sounds like you don't want that to happen.
In the Settings → Security screen is a setting called "Light sleep". I haven't used it, but from what I've read, if this is turned on, when the tablet goes to sleep after 20 minutes it will leave whatever document was on the screen, on the screen, rather than showing a "sleeping" screen.
Maybe this is what you're looking for?
Guilty as charged.
Thanks for the mention, I'm glad you find the site useful. I just wish I had more time to work on it - the list of things I want to cover is probably as long as the list of things I already have covered.