Lock screen on forever?

[scooby d1]

Is there a way, or an app, that lets me keep the lock screen illuminated, say in black in white, with some text displayed, all day? I want to wear it on my belt at work, and display simple messages that people will see. Something like, welcome to staples, or own this device, $299.
Thanks!

 

[B. Diddy]

One possible workaround is to activate Developer Options and turn on the Stay Awake option. This keeps the screen on, but only while charging--so you'd have to keep the phone plugged into a portable charger or charging case.