Page 09/22/2017 10:38:21

Gritty Amir's Flexible Wavy TFT Based Display Paper in Small!

​Gritty Amir never gives up … although he has now been working day and night @ 365/7, he got one more key paper under his belt! In the world of TFT for displays, performance (output current) is an important requirement. Traditional way of achieving that depends a lot on scaled devices. In case for TFTs for display, that would be cost prohibitive. Thus, we have shown that a vertical array of TFTs which are also laterally connected (in a wavy architecture) can achieve higher output current (as we are increasing the TFT width without an iota of geometric area increment). We have shown both its theoretical promise and experimental validation in material antagonistic way, this time, Amir et al. have shown it on flexible substrates using a low thermal budget process integration sequence which controlled LEDs.


Wavy Architecture Thin Film Transistor for Ultra-High Resolution Flexible Display


Amir Nabil Hanna, Arwa Talal Kutbee, Ram Chandra Subedi, Boon Ooi and Muhammad Mustafa Hussain


A novel wavy shaped thin-film-transistor (TFT) architecture, capable of achieving 70% higher drive current per unit chip area when compared to planar conventional TFT architectures, is reported for flexible display application. The transistor due to its atypical architecture does not alter the turn-on voltage or the OFF current values, leading to higher performance without compromising static power consumption. The concept behind this architecture is expanding the transistor’s width vertically through grooved trenches in a structural layer deposited on a flexible substrate. We show operation of Zinc Oxide (ZnO) based TFTs down to a bending radius of 5 mm with no degradation in the electrical performance or cracks in the gate stack. We finally demonstrate flexible low power LEDs driven by the respective currents of the novel wavy, as well as, conventional coplanar architectures, where the novel architecture is able to drive the LED at 2× the output power, 3 mW vs. 1.5 mW, which demonstrates the potential use for ultra-high resolution displays in an area efficient manner.


Way to go, Amir!​