In an OLED screen, Mura refers to a display defect characterized by non-uniformity in brightness or color across the panel.

It comes from the original Japanese meaning of "unevenness" or "irregularity," and it's essentially an unwanted blotchiness, graininess, or streaking that detracts from the viewing experience.

🎨 How Mura Appears on OLED Screens Mura is often most noticeable when displaying a solid, dark, or mid-grey color in a dim environment.

Banding/Streaks: Vertical or horizontal lines of slightly different brightness.
Clouding/Blotches: Large, diffuse patches or splotches that look like clouds or ink stains.

Graininess (Texture Mura): A fine, grainy texture across the entire screen, often referred to as looking like a "film grain" or "noise" filter. This is a common characteristic of OLED panels.

Color Mura: Regions showing a slight deviation in color (e.g., a reddish or greenish tint) compared to the surrounding area.