RGB色有機EL照明を用いた光信号多重通信システムの開発

抄録

Future lighting will be LED for point light sources and Organic LED for surface light sources. This research proposes a system that achieves multiplex communications under wide illumination while maintaining the lighting performance by utilizing the three-color RGB lighting of Organic LEDs. Using red and blue lights modulated signals, which have small overlap in emission wavelengths, and separating and demodulating color signals through color filters. With the current panel performance, the high cutoff frequency of the emission was 5.51 kHz for red and 6.97 kHz for blue, which did not reach the 20 kHz required for the targeted low-frequency transmission. Therefore, peaking was applied to the driving circuit to increase the Organic LED emission to higher frequencies. The cutoff frequency of the luminescence is above 20 kHz for both red and blue light, and it is expected to transmit audio signal. The measured overall crosstalk from the blue signal to the red signal was -25.7 dB, and from the red signal to the blue signal was -31.9 dB. Because the crosstalk values reduced to these values, proposed system can be adapted to transmit stereo signal in the speaker environment.