A Simple Pixel Circuit for Ultra High Resolution Active Matrix OLED-on-Silicon (OLEDoS) Microdisplays with Highly Uniform Luminance

摘要

In this paper, a simple pixel circuit is proposed for the high resolution organic light emitting diode-on-silicon (OLEDoS) microdisplay. The proposed pixel circuit achieves a wide input data voltage range using the body effect and suppresses the emission current deviation due to the threshold voltage variation of the driving transistor using the capacitive coupling effect. The proposed pixel circuit which consists of three n-type MOSFETs and one storage capacitor occupies an area of 3 μm × 9 μm. The simulated results show that the proposed pixel circuit achieves maximum input data voltage ranges of 1.37 V, 1.51 V, and 1.34 V for red, green, and blue OLED, respectively, from 1-gray to 255-gray level, and the emission current error ranges from -2.85% to +2.96% under the threshold voltage variation of ±5 mV.