Unsolved A4 report size for a medical software

[eunhyjo]

Hi,

I am totally new about QT. I am making a report file for medical software. (design / UI)
The problem is what size should I use for the A4 report file?
I thought it should be 1240x1754 px (150dpi) at least for printing later. But on the monitor screen - it is quite big. So I made again to 595x842 px (72dpi). However, on a big monitor or 4K display (for the exhibition or fair) - this size is too small.

I wonder, can I make this file as responsive? Or should I make this report file two sizes (for a computer / for a 4K display)?
Which size and unit normally use for these report files?
(pixel / resolution...etc)

Thanks in advance. :)

[Pl45m4]

@eunhyjo

What do you mean by "file"? Your QWidget?
I guess, you can scale it anyway, when you want to print something on paper.

Qt has high DPI support and some extra settings:
https://doc.qt.io/qt-5/highdpi.html

Edit:

Is your whole "report file" an image?

[eunhyjo]

@Pl45m4
Hi, Thanks for your reply.

No, It is...like an HTML document?
images and text on the file. So as a webpage it is easy to make responsible size.
But I have no idea about QT - which size should I use. :s
Please find the attached screenshot:
https://prnt.sc/u2klw5