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

Abstract

The invention discloses an organic electroluminescent display device with an organic thin film transistor (OTFT) and a method for constructing the device. By using the organic insulating layer as the gate insulating layer and the inorganic insulating layer as the capacitor medium, the display device can maintain the insulating property of the TFT while securing sufficient capacitance. In one embodiment, an 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 gate, an organic semiconductor layer, a source and a drain; the capacitor , formed in the capacitor region of the substrate and having a lower electrode and an upper electrode; a display element, connected to one of the source / drain electrodes of the TFT. In one embodiment, the gate insulating layer formed under or on the gate of the TFT includes at least an organic insulating layer, and the capacitor dielectric 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 d...

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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

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