LED Light Equipment with Optical Wireless Communication Functions

LED (Light Emitting Diode) lighting equipments can be redeveloped and employed to not only just illumination, but also can wirelessly send audio data for users. In order to make an LED bulb has two channels for stable lighting and high-quality communicates, we used LEDs with different wavelengths, which are visible light for illuminations (including dimming and toning) and infrared for data transmissions in one LED bulb. The light from LED of the communication channel is modulated by PWM (Pulse Width Modulation) method to carry original sound signal. The receiving terminal is a compact battery-less photoacoustic device and it can convert directly the light into the sound by using a solar cell and an audio cell such as an earphone or a speaker. Using our lighting communication equipment, optical audio information can be real-timely obtained in any illuminated area via the compact battery-less wireless terminal.