OLED Capping Layer and Third Electrode Edge Design
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Solution Overview
Problem
The electric properties and image quality of organic light emitting display apparatuses are limited due to contamination and damage caused by sealing parts and impurities, particularly affecting the second electrode and encapsulation processes.
Innovation Solution
An organic light emitting display apparatus is designed with a capping layer on the second electrode in a first region and a third electrode in a second region, where the third electrode has a greater thickness and specific edge portions, and the capping layer has a lower adhesiveness with the third electrode, allowing for improved patterning and reduced sheet resistance, using materials like 8-quinolinolato lithium and N,N-diphenyl-N,N-bis(9-phenyl-9H-carbazol-3-yl)biphenyl-4,4′-diamine, and forming these layers through deposition processes without a mask or with open masks to minimize patterning issues.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a sealing part is disposed on the second electrode to protect it, then reliability is improved, but contamination and damage may be generated affecting image quality and electric properties
Solution Approach 1:
The patent divides the electrode structure into multiple segments: the second electrode is separated from the sealing part by introducing a third electrode and a capping layer. This segmentation prevents direct contact between the sealing part and the second electrode, thereby avoiding contamination and damage while maintaining protection functionality.
Solution Approach 2:
The patent introduces a capping layer and a third electrode as intermediary elements between the sealing part and the second electrode. These intermediary layers act as protective barriers that prevent harmful factors from reaching the second electrode, thus improving reliability without causing contamination.
2Manufacturing precision
If the capping layer has high adhesiveness with the third electrode, then manufacturing precision is improved, but patterning difficulty increases
Solution Approach 1:
The patent applies different adhesiveness properties to different regions of the capping layer. The capping layer has high adhesiveness with the second electrode to ensure stable attachment, but controlled lower adhesiveness with the third electrode to enable easy patterning. This local differentiation of adhesive properties resolves the contradiction between manufacturing precision and patterning ease.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
This configuration enhances the electric properties and image quality by reducing sheet resistance and preventing damage, while allowing for easier patterning and improved transmittance, thus addressing the limitations of existing technologies.
Implementation Method 1
forming these layers through deposition processes without a mask or with open masks
Data Source
AI summary
An organic light emitting display apparatus and a method of manufacturing the same are provided. The apparatus includes a substrate, a first electrode formed on the substrate, an intermediate layer formed on the first electrode. The intermediate layer includes an organic emission layer. A second electrode is formed on the intermediate layer, and a capping layer is formed on the second electrode in a first region. The capping layer includes a first edge portion and at least two layers. A third electrode is formed on the second electrode in a second region. The second region is not overlapped with the first region, and the third electrode includes a second edge portion having a side portion facing a side portion of the first edge portion of the capping layer. Electric properties and image quality may be improved.