Képernykön
Képernykön is a nonstandard Hungarian inflected form derived from the noun képernyő (screen). In contemporary standard Hungarian, the locative meaning “on the screen” is expressed with képernyőn. The form képernykön is not widely attested in authoritative dictionaries and is rarely found in mainstream writing. When it appears, it tends to occur in poetry, historical or dialectal texts, or as a stylistic device to create an archaic or playful effect; it may also result from typographical error or experimentation with suffixes.
From a linguistic perspective, képernykön would be analyzed as képernyő plus a suffix resembling the superessive
In usage, if one encounters képernykön, it is best understood as a nonstandard variant meaning “on the