OLED burn-in is permanent image retention caused by uneven pixel degradation. It's most common with static UI elements like taskbars or news crawls. Our 50% grey pattern is the industry standard for detecting early-stage burn-in.
One of the few weaknesses of OLED is 'crushing' near-black details. A high-quality OLED should show the difference between 0% and 1% black. Use our Black Level tool to calibrate your gamma settings.