Array substrate, its manufacturing method and electronic device applying same

Abstract

Array substrates for electroluminescent (EL) devices and methods of forming the same are disclosed. The array substrates for electroluminescent (EL) devices include a substrate with at least one thin film transistor formed thereon, covered by a planarization layer. A first dielectric passivation layer with a contact hole therein covers parts of the planarization layer and exposes a source / drain electrode of the thin film transistor. A transparent electrode covers a portion of the first electric passivation layer and fills the contact hole, and is partly exposed by a patterned second dielectric passivation formed thereon. A plurality of spacers covers a portion of the second dielectric passivation layer to define an organic electroluminescent area with an exposed transparent electrode. An organic electroluminescent layer covers the exposed transparent electrode, and an electrode covers the organic electroluminescent layer.

Description

technical field [0001] The present invention relates to an electroluminescent device, and in particular to an array substrate suitable for active matrix organic light emitting diodes (AM-OLED) devices. Background technique [0002] Such as electro-luminescence display (Electro-Luminescence display) organic light emitting diode display (organic light emitting diode display, OLED display), etc., because of its thin and light-weight characteristics of surface emission, high luminous efficiency of self-luminescence, and low driving voltage As well as advantages such as simple process, it has become one of the options for a new generation of thin flat panel display devices. In the structure of an OLED display device, organic compounds such as dyes, polymers or other electroluminescent materials are disposed between a cathode and an anode. According to the driving method, organic light emitting display devices can be divided into passive mode organic electroluminescent (PM-OLED) ...

AI Technical Summary

Problems solved by technology

However, due to the poor flatness of the surface of the organic material, the surface average roughness (roughness average, Ra) of the transparent conductive layer formed on it is as high as 3-4 nm, which is about the standard applicable to the general transparent conductive layer (the average roughness is about 1nm), which seriously reduces the luminous efficiency of the organic electroluminescent element, and its uneven tip will cause a tip discharge effect, causing the organic layer to be broken down, resulting in a short circuit of the pixel

[0008] Furthermore, the use of organic materials will limit the options for subsequent process applications

Based on the consideration of workbench pollution, after the formation of a transparent conductive layer such as indium tin oxide, processes such as physical vapor deposition cannot be used again when forming other subsequent film layers, which is not conducive to active mode organic electroluminescent display devices reduction in manufacturing costs

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