Flexible Organic Light-Emitting Diode Displays

Abstract

Flexible displays based on organic light-emitting diode (OLED) on a plastic film are attracting much attention because of several advantages which are to be very thin, lightweight and flexible or rollable as well as self-emissive. In this article, basic structure and materials for the flexible displays are described. A flexible passive-matrix OLED displays (128 (RGB) ×72 pixels) fabricated by solution processes such as spin-coating and ink-jet printing on a plastic film are demonstrated. Then, for active driving of the OLED displays by organic thin-film transistors (OTFTs), driving voltage of the OTFT is lowered by employing the tantalum oxide gate insulator. Finally, a flexible active-matrix OLED panel (64×64 pixels) is successfully demonstrated by combining the high efficient OLED with the low-voltage driving OTFTs.