Near-field communication method using smartphone LCD luminescence

In this Letter, a near-field communication method using smart-phone liquid-crystal-display luminescence is proposed. The proposed system is composed of three parts: colour pattern generation, smartphone detection and colour pattern decoding. When the user inputs digital data such as text or numbers, the sender section converts the digital data into RGB colour pattern images using a previously prepared pattern generation method. The receiver section detects these colour pattern images using a camera, extracts the colour values and decodes them into original digital data. The data transfer accuracy to show that this system can work in real situations is tested.