OLED-Sleeper
Lightweight tool that dims idle monitors and wakes on input.
...Windows power settings control all monitors together, so individual displays cannot normally be managed.
OLED Sleeper monitors activity on each screen and reacts when a display becomes idle. After a configurable period of inactivity, it can black out the monitor or reduce its brightness. This helps protect OLED panels, reduce distractions, and save energy on unused screens.
The application is a lightweight native WPF program that uses Windows APIs directly and requires no external dependencies. It supports per-monitor control, multiple idle detection methods, and instant wake when activity resumes.