The characteristics of OLED backplanes including the intrinsic properties of a-Si TFTs and LTPS TFTs will be reviewed. While LTPS TFTs reveal satisfactory stability in AMOLED-display applications, a-Si AMOLEDs show better uniformity and are capable of driving OLEDs. However, the stability of a-Si TFTs under long-term operation is still unacceptable and remains to be the key issue constraining the commercialization of a-Si TFT AMOLEDs.
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