Date
Place
- Room F (Room 320)
- 53. Flexible/Transparent TFT and Circuitry
- August 21, 2015 (Friday)
- 11:00 ~ 12:35
- [53-5]
- 12:20 ~ 12:35
- Title:OTFTs for Conformal, Low Power, Wearable Displays
- Colin Watson, Julian Carter, Karl Crowley, and Michael Cowin (SmartKem Ltd., U.K.)
Abstract: The stability of OTFTs fabricated with SmartKem tru-FLEX¢ç will be demonstrated with recent results in low off-current being discussed in terms of the extended battery life for mobile devices. For OTFT devices fabricated with SmartKem¡¯s tru-FLEX¢ç organic semiconductor, off currents of 1x10-16 A /¥ìm have been achieved using a single gate (TGBC) structure (normalised to L=W=1 ¥ìm). When a dual gate structure is employed (as is commonly the case for IGZO TFT devices) a further reduction in off-current is observed along with an additional improvement in Vth. When extended to models of battery lifetime, a considerable improvement may be observed when compared with devices incorporating LTPS backplanes. In addition, SmartKem OTFTs were subjected to a variety of stress conditions and the before-and-after performance compared. Subjecting the devices to a voltage stress of +30 V for 2000s resulted in a Vth shift of only +0.3 V, while subjecting them to a current stress (Vgs=-30V, Vds=-30V) for 1000s resulted in a Vth shift of -0.14 V. In thermal stress tests, a Vth shift of only +0.55V was obtained after heating at 150¡ÆC for 120 minutes.
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