About the AMOLED Display
By default, the watch settings are optimized for battery life and performance (Maximizing Battery Life).
Image persistence, or pixel "burn-in," is normal behavior for AMOLED devices. To extend the display life, you should avoid displaying static images at high brightness levels for long time periods. To minimize burn-in, the Venu™ display turns off after the selected timeout (Display Settings). You can turn your wrist toward your body, double-tap the touchscreen, or press a button to wake the device.