Notice the close up of the “light” on Hellary’s podium where there is no light on Trump’s.
That little rat sure is scurrying around and very obvious about it. He’s been caught so will be replaced next debate. Next debate, Trump should walk over to Hellary’s and announce to the audience he’s checking to make sure she’s not cheating again.
Trump could have one, but it isn't on. There is a slot for it. Several regulars on here said it might be a stage light that is used when needed to fill in shadows on candidates faces.
Since hillary has to move her whole head to look down, she might get more shadows. Trump can actually move his eyes up and down, so he doesn't need to move his whole head, so he doesn't need any fill in light.
If it is a mini monitor, there are probably better displays than that OLED these days. It could be scrolled as she needs it by pressing the button on the right corner of the podium. It might have turned itself off when it sensed no one was at the podium. It would have to be turned on by her to prevent accidental turn on.