Flexible color LCD panel driven by low-voltage-operation organic TFT

A flexible color LCD panel driven by organic TFTs (OTFTs) was successfully demonstrated. A pentacene OTFT with an anodized Ta2O5 gate insulator, which can be operated at low voltage, was developed. In order to improve the electrical performance of the OTFT, the gate insulator was surface treated by processes such as O-2 plasma, UV light irradiation, and hexamethyldisilane treatments. The fabricated OTFT exhibited a mobility of 0.3 cm(2)/V-sec and a current on/off ratio of 10(7) with a low operating drain voltage of -5 V. A fast- response-time flexible ferroelectric LCD, which contains polymer networks and walls, was integrated with the OTFTs by using a lamination and a printing technique. As a result, color images were achieved on the fabricated panel by using a field-sequential-color method at a low driving voltage of less than 15 V-pp.