A Novel Depletion-Mode a-IGZO TFT Shift Register With a Node-Shared Structure

We proposed and fabricated a new depletion-mode amorphous indium-gallium-zinc-oxide thin-film-transistor (TFT) shift register with a node-shared structure. The proposed shift register requires 14 TFTs, 3 clock lines, and 3 power source lines for two output pulses, whereas the previous shift registers consisted of more than 22 TFTs, 4 clock lines, and 6 power source lines. The experimental results showed that the proposed shift register successfully generated two output pulses at one stage without any distortion. The circuit area of the proposed shift register is reduced by about 30%, as compared with that of the previous one.