High-stability OLED device and preparation method thereof

Abstract

The invention provides a high-stability OLED device and a preparation method thereof. The high-stability OLED device comprises a substrate and a packaging cover plate 10, wherein the substrate is divided into a pixel region and a packaging region; the substrate and the packaging cover plate are connected through a sealing medium; a first electrode layer, an organic light-emitting layer and a second electrode layer are overlapped on the pixel region on the substrate; and a buffer layer is arranged between the first electrode layer and the substrate. Through the arrangement of the buffer layer,the lateral erosion phenomenon caused by dry etching of the auxiliary electrode layer is solved, and meanwhile, metal ions of the glass substrate are blocked from permeating into the first electrode layer, and electrochemical corrosion is avoided; by adding the auxiliary electrode, the brightness uniformity of a screen body is improved; a pixel defining layer is simultaneously arranged on the first electrode layer and the auxiliary electrode layer and is in direct contact with the buffer layer, so that a very good surrounding structure is formed for an effective pixel region and/or pixels of the OLED, volatile gas outgas is prevented from being released into the pixels to cause pixel shrinkage, and the reliability of the screen body of the OLED is improved.

Description

technical field [0001] The invention relates to an OLED device, in particular to a highly stable OLED device and a preparation method. Background technique [0002] Organic light-emitting devices (English full name organic lighting emitting display, referred to as OLED) have the advantages of active light emission, wide color gamut, fast response, wide viewing angle, high contrast ratio, planarization, etc., and are the development trend of the next generation of display and lighting technology. [0003] An organic light emitting display device includes an anode layer, a light emitting layer and a cathode layer. Generally, there will be brightness unevenness in large-area lighting OLED light sources, and the brightness uniformity can be improved by adding auxiliary electrodes. However, the industry adopts dry etching method for etching, which is easy to produce Figure 4 Undercut, the main reason is that during the dry etching process, the dry etching gas is caused by the "...

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Problems solved by technology

[0005] Therefore, the technical problem to be solved by the present invention lies in the problem of pixel shrinkage caused by OUTGAS in the prior art. For this reason, the present invention provides a highly stable OLED device and its preparation method. By adding auxiliary electrodes, the brightness of the screen can be improved. Uniformity, and the Taper angle of the auxiliary electrode is 30-70°; at the same time, a pixel definition layer is arranged on the first electrode layer and the auxiliary electrode layer, which is in direct contact with the buffer layer, which is very good for OLED effective pixel area and / or pixel formation The surrounding structure prevents the release of volatile gas outgas into the pixel, causing the pixel to shrink, and improves the reliability of the OLED screen

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