Multi-layered OLED Pixel Electrode Etching Protection
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Solution Overview
Problem
In the manufacturing of organic light-emitting display apparatuses, the pixel electrode is prone to damage due to penetration of etching solutions during the formation of fine patterns, and achieving high color reproducibility requires multiple layers that can enhance optical efficiency, but existing methods struggle to protect the electrode layers effectively.
Innovation Solution
The solution involves a multi-layered structure for both the gate electrode and the pixel electrode, with specific materials and configurations to prevent damage during etching, including a semi-transmissive first layer, a protective second layer, a transparent third layer, and a conductive fourth layer for the gate electrode, and corresponding layers for the pixel electrode, along with an intermediate organic light-emitting layer and an opposite electrode.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If a mask is used to transfer fine patterns during manufacturing, then fine pattern formation is achieved, but the pixel electrode may be damaged due to penetration of etching solution
Solution Approach 1:
The pixel electrode is divided into multiple layers (first electrode layer with semi-transmissive conductive material, second electrode layer for protection, third electrode layer with transparent conductive material, and fourth electrode layer with conductive material). This segmentation allows the electrode to maintain fine pattern formation capability while the multiple layers prevent etching solution penetration that would damage a single-layer electrode.
Solution Approach 2:
The second electrode layer is specifically designed as a protective layer positioned between the first electrode layer (which requires fine patterning) and the etching environment. This layer acts as a cushion or barrier in advance, preventing the etching solution from reaching and damaging the underlying electrode layers during the manufacturing process.
2Illumination intensity
If multiple layers are formed in the pixel electrode to increase color reproducibility, then optical efficiency is improved, but the complexity of the electrode structure increases
Solution Approach 1:
Each layer of the pixel electrode serves multiple functions: the first electrode layer provides semi-transmissive conductivity for light emission, the second layer provides protective function against etching, the third layer provides transparent conductivity, and the fourth layer provides additional conductive support. This multi-functionality allows the structure to achieve both improved optical efficiency and color reproducibility while managing complexity through functional integration.
Solution Approach 2:
The pixel electrode employs composite material construction with four distinct layers, each made from materials with specific properties (semi-transmissive conductive material, protective material, transparent conductive material, and conductive material). This composite structure enables the electrode to simultaneously achieve enhanced optical performance, color reproducibility, and manufacturing robustness.
Data Source
AI summary
An organic light-emitting display apparatus and a method of manufacturing the same are disclosed. The organic light-emitting display apparatus includes: an active layer formed on a substrate, a gate electrode including: a first gate electrode layer insulated from the active layer and including a semi-transmissive conductive material, a second gate electrode layer formed on the first gate electrode layer configured to protect the first gate electrode layer, a third gate electrode layer formed on the second gate electrode layer and including a transparent conductive material, and a fourth gate electrode layer formed on the third gate electrode layer and including a conductive material, a pixel electrode including: a first electrode layer formed in the same layer level as the first gate electrode layer and including a semi-transmissive conductive material, a second electrode layer formed on the first electrode layer configured to protect the first electrode layer, a third electrode layer formed on the second electrode layer and including a transparent conductive material, and a fourth electrode layer formed on the third electrode layer and including a conductive material, source and drain electrodes insulated from the gate electrode and electrically connected to the active layer and the pixel electrode, an intermediate layer formed on the pixel electrode and including an organic light-emitting layer, and an opposite electrode formed on the intermediate layer.