Organic Light-Emitting Display Pixel Electrode Micro-Cavity Structure
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Solution Overview
Problem
Current organic light-emitting display apparatuses face challenges in achieving improved display quality while maintaining reduced manufacturing costs, particularly in the design and construction of electrodes and insulating layers to enhance luminescent efficiency and prevent particle defects.
Innovation Solution
The apparatus includes a substrate with a thin-film transistor and capacitor structure, featuring a pixel electrode with a transflective design and a reflective opposite electrode, along with strategically layered organic insulating layers to create a micro-cavity structure that improves luminescent efficiency and reduces manufacturing complexity by minimizing exposure to etchants.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a conventional electrode and insulating layer structure is used, then manufacturing process is simpler, but luminescent efficiency is lower and particle defects occur
Solution Approach 1:
The insulating layer is segmented into multiple layers (first insulating layer, second insulating layer, third insulating layer) with different materials and functions. Each layer serves specific purposes: the first provides etchant resistance, the second provides electrical insulation, and the third provides additional protection, collectively solving the luminescent efficiency and particle defect problems without requiring complete structural redesign
Solution Approach 2:
The patent employs composite material structure where the insulating system combines organic insulating materials (first and second insulating layers) with inorganic insulating materials (third insulating layer). This composite approach leverages the advantages of each material type to achieve both high luminescent efficiency and manufacturing feasibility
2Manufacturing precision
If complex multi-layer insulating structures are added to improve display quality, then particle defects are reduced, but manufacturing cost and process complexity increase
Solution Approach 1:
The first insulating layer is formed preliminarily before the pixel electrode to establish etchant resistance in advance. This preliminary action prevents particle defects during subsequent manufacturing steps, ensuring high display quality without requiring complex corrective measures later in the process
Solution Approach 2:
The insulating layer structure is designed to perform multiple functions simultaneously: etchant resistance, electrical insulation, and particle defect prevention. By integrating these functions into a unified multi-layer structure, the patent achieves high manufacturing precision without proportionally increasing manufacturing cost
3Ease of manufacture
If the pixel electrode is designed without protective insulating layers, then manufacturing process is simpler, but the electrode is exposed to etchants causing particle defects
Solution Approach 1:
The first and second insulating layers are positioned beforehand to cushion and protect the pixel electrode from etchant exposure during manufacturing. This protective arrangement prevents particle defects without complicating the overall manufacturing process, as the insulating layers are integrated into the standard fabrication sequence
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 luminescent efficiency by refracting and reflecting light effectively and reduces manufacturing costs through simplified processes, minimizing particle defects and maintaining high display quality.
Implementation Method 1
This configuration enhances luminescent efficiency by refracting and reflecting light effectively
Implementation Method 2
This configuration enhances luminescent efficiency by refracting and reflecting light effectively
Data Source
AI summary
An organic light-emitting display apparatus includes a substrate, and a thin-film transistor and a capacitor formed over the substrate. The apparatus further includes an interlayer insulation layer, a first organic insulating layer and a second organic insulation layer sequentially stacked over the substrate and covering the thin-film transistor and a capacitor. The first organic insulation layer includes a first hole that does not overlap with the thin-film transistor and the capacitor when viewed in a direction perpendicular to a major surface of the substrate. The apparatus further includes a pixel electrode formed over the interlayer insulating layer and the first organic insulating layer. The pixel electrode includes a first portion disposed inside the first hole and a second portion disposed over the first organic insulating layer and outside the first hole. The apparatus includes a light emission layer and an opposite layer formed over the pixel electrode.