Amorphous silicon technology has drawn much attention as a competitive candidate for active-matrix organic light emitting display (AM-OLED) due to the benefit of using existing active matrix liquid crystal display (AM-LCD) infrastructures thus maintaining low investment and manufacturing cost. However, amorphous silicon thin film transistor (a-Si:H TFT) has long term stability problems, such as threshold voltage shift due to gate bias stress.
Researchers at the University of Michigan have developed a new pixel circuit suitable for enhancing the reliability of AM-OLED with a-Si:H TFT backplane and top-anode OLED structure. The proposed pixel circuit is composed of 5 a-Si:H TFTs for switching and driving device, and it does not require any complicated drive ICs.
Applications and Advantages
- Enhances reliability