The Mura effect, or "clouding", is a term generally used to describe uneven displays, caused by the imperfect illumination of the screen. These effects can manifest themselves in areas or individual pixels that are darker or brighter, show poorer contrast, or simply deviate from the general image. As a rule, these effects are particularly noticeable in the reproduction of dark images and under darker environmental conditions.
Generally speaking, the Mura Effect is a fundamental design feature of current LCD screens. Mura Effects can also manifest themselves in displays based on OLED technology (especially on smartphones). Virtually no display that works with back-lit – or, even more severely so, with corner/side-lit – LCD technology is free of Mura Effects.
Because of the continuous miniaturisation of displays – particularly ever-decreasing panel width and the remarkably advent of smartphones in recent years – this effect occurs more and more often, and is therefore known to a wider range of users.
The Mura Effect is an industry-wide phenomenon that usually cannot be repaired!