A Low Power and IR Drop Compensable AMOLED Pixel Circuit Based on Low-Temperature Poly-Si and Oxide (LTPO) TFTs Hybrid Technology

Hezi Qiu, Junjun An, Kun Wang, Congwei Liao, Chao Dai, Xin Zhang, Shengdong Zhang
2021 IEEE Journal of the Electron Devices Society  
In this paper, an AMOLED pixel circuit based on low-temperature poly-crystalline silicon and oxide (LTPO) thin-film transistors (TFTs) hybrid technology is proposed, which features only two transistors in a serial connection with OLED. The power supply can thus be reduced by 25~30% in the "Always-on-Display" (AOD) mode compared with the earlier LTPO pixel circuits which usually have three transistors in the current path and need a higher supply voltage. Furthermore, in addition to a strong
more » ... essing ability to Vth variations/shift, the proposed pixel circuit has an excellent compensation ability for current-resistance voltage drops (i.e. IR drop), which is also superior to the earlier LTPO ones where the IR drop has to be compensated externally. Therefore, the proposed LTPO pixel circuit is able to provide AMOLED displays with lower power consumption and higher display performance than the earlier ones.
doi:10.1109/jeds.2021.3132693 fatcat:mem527luw5cqtio7hfj7o52kea