Organic Light Emitting Diode Lifetime Measurement System Implemented with Arduino and Raspberry Pi

This paper adopts Arduino DUE and Raspberry Pi for organic light emitting diode (OLED) lifetime measurement. Using digital-analog converter (DAC) port of Arduino DUE output voltage to control the constant current source and generate the constant current to drive OLED, and using analog-digital converter (ADC) port to read the photodetector voltage (then converting to luminance) and OLED voltage. The Qt Creator was installed in Raspberry Pi to control the measuring processes and display the data. Longtime measurement results of OLED luminance were shown in the coordinate graph that was drawn through Qt program Especially studied were to filter the noise in the hardware circuit and to set a constant current for OLED. With suitable filters to delete the noise, the stable and correct signal from photodetector can be acquired then.