Display Sleep / Wake on Schedule

Is there some sort of display keep-awake command that could be scheduled? I have a machine I'd like to run a dashboard display during certain hours without having to interact with it every day to wake and sleep. This means I'd like _only the display_ to wake and sleep on a schedule of my choosing without locking the desktop session and requiring a password to wake and without sleeping the entire machine (the machine itself must continue to process events 24/7). I intend to have an unprivileged "kiosk" account always signed in for this, and an unused pen-driven display for interacting with the dashboard without hauling out the keyboard/mouse. This set of requirements precludes a lot of the usual allowances afforded by standard screen savers, screen-locking, power management, etc. in that I want the display to truly sleep during its off hours unless specifically awoken by a click of the tablet's buttons, a keyboard, etc., at which point it would simply auto-sleep after a period of inactivity as usual. Note: I didn't bother specifying "I'm using Ubuntu Desktop" because I'm hoping for a generic solution that is independent of the GUI environment, even if I have to build and install it. I'd also like to avoid periodically faking keyboard/mouse events so they don't interfere with console use. Please let me know in comments if you need more specific information.