scrcpy
Display and control your Android device
...scrcpy displays only the device screen but offers great performance (30~60fps) and quality (1920×1080 or above). It’s got low latency (35~70ms) and a very low startup time (less than a second). It offers plenty of great features and is non-intrusive, with nothing left installed inside the device.
scrcpy works with Android devices with at least API 21 (Android 5.0) and adb debugging must be enabled on the device.