This logo was used throughout the Eighties, maybe it was introduced even earlier.
In April 2012, WDR announced a corporate pedesign which will be applied step by step to fully replace the previous design by 2014.
WDR Fernsehen (HD)
Nordwestdeutscher Rundfunk (1945-1953)
Das Erste (HD) | EinsPlus (HD) | One (HD) | tagesschau24 (HD) | ARD-alpha