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\documentclass[ 
   a4paper, 
   oneside, 
   %twoside, 
   12pt, 
   parskip=half, 
   headsepline, 
   footsepline, 
   headinclude, 
   footinclude=false, 
   DIV15, 
]{scrreprt} 

\usepackage{graphicx}
\usepackage{tikz}

\begin{document} 
   \begin{titlepage} 
	\begin{tikzpicture}[overlay, remember picture]
		\node [anchor=north west,inner sep=0pt] at (current page.north west)
		  {\includegraphics[width=21.15cm]{banner.png}};
	\end{tikzpicture}
   \end{titlepage} 

   \clearpage 
   \chapter{Einleitung} 
   Das eigentliche Dokument 
\end{document}

\documentclass{scrreprt} 

\usepackage{tikz}
\usetikzlibrary{calc}

\begin{document} 
   \begin{titlepage} 
	\begin{tikzpicture}[overlay, remember picture]
		\fill [orange] (current page.north west) rectangle ($(current page.north east)-(0,2cm)$);
		\node [right] at ($(current page.north west)+(3cm,-1cm)$) {Uni Musterhausen};
		\node [left] at ($(current page.north east)-(3cm,1cm)$) {M. Mustermann};
	\end{tikzpicture}
   \end{titlepage} 

   \clearpage 
   \chapter{Einleitung} 
   Das eigentliche Dokument 
\end{document}

\documentclass[
	a4paper,
	oneside,
	%twoside,
	12pt,
	parskip=half,
	headsepline,
	footsepline,
	headinclude,
	footinclude=false,
	DIV15,
]{scrreprt}

\usepackage{graphicx}

\begin{document}
	\begin{titlepage}
		\centering
		\vspace*{-4,10cm}
		\hspace*{-2,32cm}
		\includegraphics[width=21.15cm]{banner.png}
		\hfill
		\vfill
	\end{titlepage}

	\clearpage
	\chapter{Einleitung}
	Das eigentliche Dokument
\end{document}