Proceedings of the International Display Workshops Volume 31 (IDW '24)
Dec 4 - Dec 6, 2024Sapporo Convention Center
Proceedings of the International Display Workshops Volume 31 (IDW '24)
Dec 4 - Dec 6, 2024Sapporo Convention Center
[DES2-2]Oxide TFT-Based Micro-LED Pixel Circuit Enhancing Low Gray Expression Through Continuous Piecewise Linear Sweep Signal
*Jaybum Kim1, Kyeong-Soo Kang1, Ji-Hwan Park1, Chanjin Park1, Minji Kim1, Soo-Yeon Lee1(1. Seoul National University (Korea))
Keywords:
micro-LED pixel circuit,PWM circuit,Separated Emission,Sweep slope change
In this paper, we propose a compensation pixel circuit for micro-LED displays employing separate emission phases. In this method, a sweep signal is continuous piecewise linear and has two slopes: one for low gray levels and the other for mid-to-high gray levels. By adopting a higher slope sweep signal for low gray levels than high gray levels, the falling time is significantly reduced from 234 µs to 114 µs, achieving accurate low gray expression down to 50 G.