This is the 4454th most frequent Korean word.
화면에
"On the screen."
Here, '화면에' refers to the location or medium on the screen where something is displayed or entered.
화면에 입력된 숫자가 올바른지 확인하세요.
Check if the numbers entered on the screen are correct.
In this sentence, '화면에' is used to indicate the surface or area of the screen where the photo is shown.
그는 사진을 화면에 띄워 보여줬다.
He displayed the photo on the screen and showed it.
Here, '화면에' specifies the screen as the place where the error message appeared.