A new shift register employing bottom-gate In-Ga-Zn-O thin-film transistors (IGZO TFTs) was proposed and fabricated. Depletion-mode IGZO TFTs were successfully turned off by employing two low-voltage-level signals. The IGZO shift register exhibited a high-voltage output pulse without any distortion and a maximum clock frequency of 417 kHz. The proposed shift register would be an important building block for a depletion-mode oxide TFT display.

No abstract

We successfully realized world first 77-inch transparent flexible OLED display with Ultra High Definition (UHD) resolution, which can be rolled up to a radius of 80 mm with a transmittance of 40%. The process flow and key technologies to fabricate a large size transparent flexible OLED panel will be discussed.

This is the first report on real XGA AMLCD for NBPC with highly stable integrated gate driver circuits using a-Si TFT. The new circuit has been designed with dual-pull down structure for high reliability and has been working for over 2,000 hours at 60 o C, which is sufficient working time for normal driving conditions.

A novel gate driver circuit using a-Si TFT has been developed. It has AC driven single pull-down structure for maintaining gate line voltage. Degradation of the circuit is retarded because of relieved stress to the pull-down TFT by alternating the gate node voltage. The circuit has been successfully integrated in 14.1-in. XGA TFT-LCD panel.