Abstract
We have developed a flexible full-color 4.1-inch 121-ppi FWQVGA AM-OLED display and a flexible 4.8-inch 169-dpi VGA electrophoretic display (EPD) driven by organic TFTs (OTFTs). In the OTFTs, all dielectric layers are formed from solution of polymers. For organic semiconductors, peri-Xanthenoxanthene (PXX) derivatives have been originally developed. The OTFT with 5-μm channel length shows apparent mobility of 0.4cm2/Vs and current on/off ratio >106. We have developed an integrated gate-driver circuit with the OTFTs on the flexible OLED display. This enables to eliminate rigid gate-driver ICs and roll up the OLED display with bending radius of 4mm. We have also developed high resolution printing technique of the PXX derivatives. The printed OTFT backplane has successfully applied to the flexible EPD.
