21.3: 4.0 In. QVGA AMOLED Display Using In‐Ga‐Zn‐Oxide TFTs with a Novel Passivation Layer

We have developed a 4.0 inch QVGA AMOLED display using amorphous In-Ga-Zn-Oxide TFTs, focusing on a passivation layer. Threshold voltage of the TFTs can be controlled to have “normally off” characteristics by using SiOx with a low hydrogen content. Besides, small subthreshold swing and high saturation mobility are obtained.