How to turn picture frame off?

[etreml]

Is ist okay to simply unplug the device and the OS stays intact or do I need to shutdown the OS via a terminal command?

[escuco]

Because the boot and root partition are mounted read-only, normally it's no problem to unplug the raspberry without a shutdown.

Alternative it's possible to only switch the hdmi display off respectively in power saving mode via the web ui or home automation. There is even a way to switch the display on and off via motion detection: https://github.com/avanc/photOS/wiki/Motion-Detection

[avanc]

As @escuco mentioned, it quite safe to just unplug the device. If you want to shutdown it safely, you can use the WebUI instead of an terminal command: