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In this work, we demonstrate a capacitive coupled data transfer with flexible thin-film electronics using touchscreen as ubiquitous reader interface. The capacitive communication to the touchscreen is proven using a 64-bit metal-oxide thin-film capacitive-coupled identification tag. The tag is powered by a thin film battery or thin-film photovoltaic cell that is converting the light of the screen. The thin-film integrated tag has on-chip monolithic electrodes (0.8cm2), and the integrated circuit employs 409 transistors and dissipates only 140nW of power at 600mV supply voltage. The asynchronous data rate of the chip is up to 35bps, strictly limited by the touchscreen readout electronics.

We present dual-gate (DG) dual-layer (a-ITZO and a-IGZO) amorphous oxide TFTs integrated on polyimide (PI) foil. The fabricated TFTs show an apparent dual-gate field-effect mobility ($\mathrmμ$FE) of 45.0 cm2/ (V.s), sub-threshold slope (SS-1) of 0.40 V/decade and ION/IOFF ratio of $>$108. The DG dual-layer TFT based ring-oscillators exhibit faster oscillation frequencies (fosc) compared to DG a-IGZO TFT based ring-oscillators. These TFTs are paving the way to faster scan drivers and higher resolution displays. It is also verified that with DG dual-layer TFTs, the current variation can be reduced when applying an off-panel compensation method to the asymmetric channel. lccn: C42287 shorttitle: P-12 keywords: flexible displays,Metal-oxide semiconductors,TFT ispartof: SID Symposium Digest of Technical Papers vol:50 issue:1 pages:1255-1258 status: published