The scheme of OLED control device for room lighting

Abstract

The electric scheme of control device of organic light-emitting diodes which are considered to apply for room lighting has been introduced. There are three channels with OLED adjustable brightness. This allows to control either tricolor panel sorlighting of three-room areas, orto perform a three-stage control of the light. Thus, it provides a gradual change in lighting brightness by alternating lighting in each of three channels. Its feature is to maintain constant lighting in the room depending on the time of day (outdoor lighting). The developed scheme of the device can be used in such systems as "Smart Home", one of the subsystems of which is the lighting subsystem. Its purpose is to control the lighting in the room for comfort and energy saving. The device has been designed in order to function on its own and it can be further developed for integration into the "Smart Home" system using a "single-wire" protocol for control. Since OLED can be applied into flexible substrates, light-emitting surfaces can be designed as a wall paper or plates that will be attached to the wall or ceiling. It can also be designed in the form of tension structures. The control scheme can be developed and improved, its functionality has to be expanded. It is also important to provide control on a local wireless network of Wi-Fi, etc. Unlike a silicon LED, the dependence of the luminous flux on the current through the organic LED has a slightly different character – it is nonlinear and with increasing LED current, the rate of brightness increases. This characteristic is taken into account in the laws of regulating microcontroller program which controls work of the device. In order to reduce the effect of light pulsations on vision, which are observed at short PWM pulse duration, the brightness is adjusted partly by PWM (from 50%to 100% ofthepulseduration) and partly by adjusting the supply voltage of the LEDs.