Why do I notice slight differences in the black borders on the left and right sides of my OLED display?

05-11-2026

This is normal behavior and is related to the built-in OLED burn-in protection mechanism (Pixel Shift) on BenQ monitors.

Pixel Shift subtly moves the image position over time to reduce the risk of image retention caused by static content. As a result, the edges of the screen (such as the left and right black borders) may appear slightly different in width at times. This is an intentional design behavior and not a panel defect.

This mechanism helps extend panel lifespan while maintaining consistent image quality during long-term use.

Applicable Models

EX271QZ, EX271UZ, EX321UZ

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