The IGZO AMeTFT 2T1C dramatically upgrades the traditional 2T1C pixel circuit for the small-to-large-area displays. The circuit interfaces directly with the same displays drivers - IC or gate-on-array - used in current silicon, IGZO and LTPS 2T1C pixel circuits.
Two critical advantages separate IGZO AMeTFT 2T1C from traditional 2T1C circuits: speed and leakage current. IGZO AMeTFT integrates the speed of LTPS TFTs with leakage current below that of IGZO TFTs in creating a single high-performance pixel scalable from AMOLED smartphones to microLED gaming monitors and AMOLED-based TVs.
With the addition of industry-standard positive-bias stress performance, IGZO AMeTFT delivers 6T1C LTPO (Low Temperature Poly Oxide) stack performance…in a 2T1C circuit.
Moreover, the Amorphyx stack is based on a consistent materials system so that there are no issues found standard LTPO where hydrogen from LTPS processing fouls the oxide channel. By eliminating the need for LTPS TFT technology, the hydrogenation problem that causes lower yields and technology challenges in LTPO is no longer a concern.
What is LTPO?
Apple wanted to allow for AMOLED displays to have lower power performance especially for Smartwatch applications to allow for all-day-use
scenarios. They invented a process technology called LTPO (low temperature poly oxide) which processes oxide TFT technology (for the switching transistor since it has low leakage currents) on top of the LTPS technology (for the drive transistor) which has decent current carrying capability. By using the two together it is claimed that a 15% power saving can be found
However the downside of this approach are twofold. First is the immense process cost of the large number of masks to implement this dual stack of transistors. Second is the hydrogenation problem where hydrogen from the LTPS manufacturing fouls the oxide semiconductor channel and reduces yield. LTPO is shown in the Apple Watch 6 and Apple reputedly plans to use it in Smartphone Applications
