Auxiliary Electrode for OLED Conductivity and Damage Prevention
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Solution Overview
Problem
In the manufacturing of large-sized organic light-emitting display apparatus, the process of patterning electrodes can damage light-emitting devices and result in degradation of image quality due to insufficient electrical conductivity of the second electrode.
Innovation Solution
An organic light-emitting display apparatus is designed with a substrate, a first electrode, a pixel defining layer, an organic light-emitting layer, a second electrode, and an auxiliary electrode made of conductive materials like Al, Ag, Au, Cu, or ITO, which is contacted on the second electrode to enhance conductivity and prevent damage during patterning.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the second electrode is patterned to obtain electrical conductivity, then the voltage drop is reduced, but the organic light-emitting devices may be damaged during the patterning process
Solution Approach 1:
A sacrificial layer is introduced as an intermediary component between the organic light-emitting devices and the patterning process. This sacrificial layer protects the organic light-emitting devices during electrode patterning, preventing damage while allowing the second electrode to be patterned for obtaining electrical conductivity. After patterning, the sacrificial layer is removed, having served its protective function.
2Manufacturing precision
If the second electrode is patterned with high definition, then the image quality is improved, but the processing time and complexity increase
Solution Approach 1:
The sacrificial layer is formed in advance before the electrode patterning process. This preliminary action establishes a protective framework that enables high-definition patterning of the second electrode without increasing processing time, as the protection is already in place during the patterning step rather than being added afterward.
Data Source
AI summary
An organic light-emitting display apparatus including a substrate; a first electrode on the substrate; a pixel defining layer on the substrate, the pixel defining layer including an opening exposing a portion of the first electrode and corresponding to a pixel; an organic light-emitting layer disposed on the first pixel electrode in the opening; a second electrode on the pixel defining layer and the organic light-emitting layer; and an auxiliary electrode contacted on the second electrode, disposed on the pixel defining layer.