The technology, which has been trialled by companies including Procter & Gamble and Lloyds TSB, enables advertisers to show messages on the screens of digital radios at the same time as their radio ads run.
Radio stations currently use the screens to display the name of the radio show or song being played. However, the radio industry is predicting that the technology will become a fresh revenue stream and many stations are considering following GCap's lead.
About 16% of the UK population now have access to a digital radio, according to Rajar results for the period ending 17 December 2006 - up five percentage points on the fourth quarter of 2005.
Almost 70% of DAB listeners have used the text display to find out more about what they are listening to, according to research from the Radio Advertising Bureau.
At GCap, the digital-screen initiative is being overseen by Andy Wood, head of commercial programming.
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