Organic electroluminescent display device having OTFT and method of fabricating the same

Abstract

An organic electroluminescent display device having an organic thin film transistor (OTFT) and a method of fabricating the same is disclosed. The display device can maintain an insulation property of a TFT and concurrently, ensure a sufficient capacitance by using an organic insulating layer for a gate insulating layer and using an inorganic insulating layer for a capacitor dielectric. In one embodiment, the organic electroluminescent display device includes a substrate having a capacitor region and a transistor region, a TFT formed in the transistor region of the substrate, and having a gateelectrode, an organic semiconductor layer, a source electrode, and a drain electrode, a capacitor formed in the capacitor region of the substrate, and having a lower electrode and an upper electrode,and a display element connected to one of source / drain electrodes of the TFT. In one embodiment, a gate insulating layer formed below or on the gate electrode of the TFT includes at least an organic insulating layer, and a capacitor dielectric formed between the upper and lower electrodes of the capacitor includes an inorganic insulating layer.

Description

[0001] This application claims the benefit of Korean Patent Application No. 10-2004-0086779 filed with the Korean Intellectual Property Office on October 28, 2004, the entire disclosure of which is hereby incorporated by reference. technical field [0002] The present invention relates to a flat panel display device, and more particularly to an organic electroluminescent display device with an organic thin film transistor and a method for constructing the device, wherein the gate insulating layer of the organic thin film transistor adopts organic insulating layer and the capacitor dielectric uses an inorganic insulating layer. Background technique [0003] Organic thin film transistors (OTFTs) have been actively developed as driving elements of next-generation display devices. The OTFT uses an organic layer instead of a silicon layer as a semiconductor layer. According to the composition of the organic layer, OTFT can be divided into low-molecular-weight OTFTs such as oligo...

AI Technical Summary

Problems solved by technology

[0011] However, when the gate insulating layer is too thick, a capacitor using a portion of the gate insulating layer as a capacitor dielectric has insufficient capacitance

[0012] On the other hand, if the organic gate insulating layer is too thin, the capacitor will work, but will not provide the desired level of insulation for the gate

Images