The LED backlights of LCD displays are modulated to broadcast relevant information synchronized to the screen content in each frame using visible light communication (VLC) or Li-Fi. The signal is then captured and decoded by a smartphone camera to establish an optical camera communication (OCC) link. This work presents a Li-Fi based QR code (LiQR) backlight modulator that is embedded in a LCD display to enable IoT applications including location and content based information broadcasting.

© 2018 Optical Society of Japan

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