This problem previously appeared in Galaxy S20 Ultra users shortly after the phone was released. At that time, Samsung solved the problem with a firmware update.
However, it turns out a similar problem also befell users of other Samsung models. Noted, users of the Galaxy Note 8, Galaxy Note 9, Galaxy S9 series, Galaxy S10 Lite, and Galaxy Note 10 Lite experience greenish screens like the S20 Ultra.
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Users complain that the green screen problem appears after the latest firmware update. In general, green screen problems occur when the screen has low brightness. Thus, the problem is claimed to not always reduce the inconvenience of use.