4032-pixels per inch threshold voltage compensation pixel circuit for organic light-emitting diode-on-silicon

Virtual reality (VR) headsets with pancake lenses require organic light-emitting diode-on-silicon (OLEDoS) panels for higher pixel density and superior image quality. Achieving high-quality OLEDoS panels necessitates integrating pixel compensation circuits within the limited pixel area of high-resolution displays. However, reduced transistor count increases Vth variation, while smaller storage capacitors with higher parasitic capacitance degrade image quality. This study proposes a novel 7T1C pixel compensation circuit for 4032-ppi OLEDoS panels operating at 8 V. The circuit minimizes the body effect in CMOS transistors by maintaining equal voltage at the source and body nodes of the driving transistor. An area-efficient single-capacitor design and a data-driving method without toggling mitigate image quality degradation caused by capacitor coupling. The proposed 4032-ppi panel enhances short-range uniformity (SRU) from 90.4% to 97.3% and reduces horizontal cross-talk from 2.0% to 1.3%.