OLED-T, spun out from London's South Bank University, uses organic material to manufacture components that can be used in small portable devices such as laptops and mobiles.
The technology helps devices to be lighter and use less battery power than other products on the market – and the screen images are clearer than with an LCD display.
Rainier was engaged after a non-competitive pitch and has inked a 12-month contract.
Agency MD Stephen Waddington heads the account, reporting to OLED-T chief executive Myrddin Jones.
‘This market was worth $1bn worldwide last year and is attracting the attention of analysts and techies,' said Waddington.
‘The challenge will be working with the scientists to help them realise commercial success while making the technology understandable for a wider audience.'