Prevent screen from sleeping

[Kdash4]

How can i prevent screen from sleep? The maximum number on my phone's setting is 10 minutes for keep the screen awake. However this is not enough for me. When i use desktop mode with taskbar app, screen never goes to sleep so i can do other stuff while phone connected to monitor. I can't do this with smart dock. Please add an option to keep screen awake all the time while using smart dock.