Low Noise Lifetime Measurement System for Organic Light-Emitting Diodes

• Main Authors: HUANG, CHEN-YU, 黃振育
• Other Authors: JUANG, FUH-SHYANG
• Format: Others
• Language: zh-TW
• Published: 2018
• Online Access: http://ndltd.ncl.edu.tw/handle/dm569u

碩士 === 國立虎尾科技大學 === 光電工程系光電與材料科技碩士班 === 106 === The research focus of this thesis is to use the Raspberry Pi 3B and Arduino DUE to measure the luminescence brightness of OLED (Organic Light-Emitting Diodes) and observe its luminescence lifetime. Install QT Creator in the Raspberry Pi, at Qt The control circuit and the OLED illumination are observed in the human interface of Creator. The Arduino DUE is controlled by Qt Creator to make the DAC (digital to analog) pin output voltage of the Arduino DUE, drive the constant current circuit through the voltage of the DAC pin, and then use the constant current output by the circuit to drive the OLED. The photo sensor generates different photocurrents due to the intensity of the illumination light, and then outputs the voltage through the photosensor circuit, and then reads the photo sensor and the OLED through the ADC (analog-to-digital) pin of the Arduino DUE. The voltage is transmitted to Qt Creator and the voltage value of the photo sensor and the OLED is displayed. The formula generated by the Fitting function of Origin 8 is used to calculate the brightness corresponding to the received photosensor voltage, and the voltage is displayed on the human-machine interface. Value and brightness, and plot the time vs. brightness, and finally store the voltage and brightness data. The overall circuit is good. The Arduino DUE's ADC pin measures a lot of data noise, improving the original constant current circuit, enabling the constant current circuit to stably drive the OLED to observe the illuminating situation. Add the filter capacitor to the output of the optical sensor circuit, the operational amplifier feedback terminal, and the operational amplifier. Then observe the peak-to-peak value of the output waveform with an oscilloscope to see if there is noise reduction. Finally, the commercially available 16 The bit analog analog-to-digital module replaces the ADC pin of the Arduino DUE to read the photosensor circuit and the OLED voltage to reduce the noise of the measured data.