A method of generating a sequence of display frames, for display on a display device, derived from a data string is described. The data string is encoded to include error correction in order to enable recreation of the data string at a receiving device. The method comprises the steps of dividing the data string to be encoded into a plurality of source segments, and encoding the plurality of source segments to generate a plurality of codewords, each codeword comprising a plurality of codeword bits, and codeword bits are positioned in the sequence of frames.