I was able to access the display settings by reseting the KDE configuration.
1) Remove (don't forget to backup) folders ~/.kde, ~/.local and ~/.config . 
Removing all of them is necessary :-(
2) Reboot (log out is not enough)
3) Start the display setting :-)
4) Copy configurations of selected apps back to the new folders.

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https://bugs.launchpad.net/bugs/1581897

Title:
  kcm_kscreen.desktop file does not exist

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