In 1980, when sending and receiving infrared semiconductor devices are developed, slowly replacing the ultrasonic and infrared remote control. Since then, the infrared remote controller was born. Infrared remote control is using near-infrared light to transmit telecommand, wavelength of 0.76um~1.5um. Using near-infrared remote control lights, because the infrared emitter (IR led) and the infrared receiver (photosensitive diodes, transistors and photovoltaic cells) light with a peak wavelength of light is generally 0.8um~0.94um, in the near-infrared band, the combination of spectral overlap and can match very well, can achieve high efficiency and high reliability. Advantages of the infrared remote control is also evident, that's extremely low manufacturing costs, was widely used until now.
But gradually in later use, people slowly discovered that there are many disadvantages of infrared remote control. With the TV screen increases gradually, but the infrared receiver window is getting smaller and smaller, some new types of indoor lighting and TV installation in a different way, to interfere with the infrared receiver of the remote control window. Therefore, in order to solve this problem, as the giant home appliance industry, Japan, Sony has finally acted.